Failing to cross-compile to Window target x86_64-pc-windows-gnu

[brunoluizkatz-NETZSCH]

Before

• I tried the idea (Build fails on windows-latest (which is now windows-2022) #147 (comment)) and cloned the paho.mqtt.rust repository and update the cmake into paho-mqtt-sys/Cargo.toml but with the same result below
• I am stuck with this for the entire day plz help haha

Steps:

My Cargo.toml

[package]
name = "mqtt_explorer_lib"
version = "0.1.0"
edition = "2021"

[dependencies]
egui = { version = "0.18.0" }
egui_extras = { version = "0.18.0" }
paho-mqtt = { version = "0.11", default-features = false, features = ["bundled"] }
serde = { version = "1.0.104", features = ["derive"] }
serde_json = "1.0.48"
regex = "1"
chrono = "0.4.11"

My ./.cargo/config file

[target.x86_64-pc-windows-gnu]
linker = "x86_64-w64-mingw32-gcc"
ar = "x86_64-w64-mingw32-gcc-ar"

Output Errors:

With cargo build

sudo apt-get install gcc-mingw-w64-x86-64 -y
cargo build --target x86_64-pc-windows-gnu --release

Error output with cargo build --target ...

    Updating crates.io index
   Compiling cmake v0.1.45
   Compiling idna v0.2.3
   Compiling parking_lot_core v0.9.3
   Compiling parking_lot_core v0.8.5
   Compiling glutin_wgl_sys v0.1.5
   Compiling clipboard-win v4.4.1
   Compiling time v0.1.44
   Compiling num-integer v0.1.45
   Compiling libloading v0.7.3
   Compiling bytemuck_derive v1.1.0
   Compiling tracing-attributes v0.1.21
   Compiling thiserror-impl v1.0.31
   Compiling futures-macro v0.3.21
   Compiling serde_derive v1.0.137
   Compiling glutin_egl_sys v0.1.5
   Compiling regex v1.5.6
   Compiling parking_lot v0.12.1
   Compiling parking_lot v0.11.2
   Compiling chrono v0.4.19
   Compiling paho-mqtt-sys v0.7.0
   Compiling url v2.2.2
   Compiling winit v0.26.1
   Compiling bytemuck v1.9.1
   Compiling webbrowser v0.7.1
   Compiling futures-util v0.3.21
   Compiling emath v0.18.0
   Compiling thiserror v1.0.31
   Compiling glutin v0.28.0
   Compiling tracing v0.1.35
   Compiling epaint v0.18.1
   Compiling arboard v2.1.1
   Compiling egui v0.18.1
   Compiling serde v1.0.137
error: failed to run custom build command for `paho-mqtt-sys v0.7.0`

Caused by:
  process didn't exit successfully: `/home/my_user/Documentos/mqtt-explorer/target/release/build/paho-mqtt-sys-9b3aea11c9bec0db/build-script-build` (exit status: 101)
  --- stdout
  debug:Running the bundled build for Paho C
  debug:Building for Windows
  cargo:rerun-if-changed=build.rs
  detected home dir change, cleaning out entire build directory
  running: "cmake" "/home/my_user/.asdf/installs/rust/1.60.0/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/" "-DCMAKE_SYSTEM_NAME=Windows" "-DCMAKE_RC_COMPILER=/usr/bin/x86_64-w64-mingw32-windres" "-DPAHO_BUILD_SHARED=off" "-DPAHO_BUILD_STATIC=on" "-DPAHO_ENABLE_TESTING=off" "-DPAHO_HIGH_PERFORMANCE=on" "-DPAHO_WITH_SSL=off" "-DCMAKE_INSTALL_PREFIX=/home/my_user/Documentos/mqtt-explorer/target/x86_64-pc-windows-gnu/release/build/paho-mqtt-sys-f4a6b903351f2e74/out" "-DCMAKE_C_FLAGS= -ffunction-sections -fdata-sections -m64" "-DCMAKE_C_COMPILER=/usr/bin/x86_64-w64-mingw32-gcc" "-DCMAKE_CXX_FLAGS= -ffunction-sections -fdata-sections -m64" "-DCMAKE_CXX_COMPILER=x86_64-w64-mingw32-g++" "-DCMAKE_ASM_FLAGS= -ffunction-sections -fdata-sections -m64" "-DCMAKE_ASM_COMPILER=/usr/bin/x86_64-w64-mingw32-gcc" "-DCMAKE_BUILD_TYPE=Release"
  -- The C compiler identification is GNU 9.3.0
  -- Detecting C compiler ABI info
  -- Detecting C compiler ABI info - done
  -- Check for working C compiler: /usr/bin/x86_64-w64-mingw32-gcc - skipped
  -- Detecting C compile features
  -- Detecting C compile features - done
  -- CMake version: 3.21.20210814-g688b647
  -- CMake system name: Windows
  -- Timestamp is 2022-08-12T21:05:14Z
  -- Configuring done
  -- Generating done
  -- Build files have been written to: /home/my_user/Documentos/mqtt-explorer/target/x86_64-pc-windows-gnu/release/build/paho-mqtt-sys-f4a6b903351f2e74/out/build
  running: "cmake" "--build" "." "--target" "install" "--config" "Release" "--"
  [  3%] Building C object src/CMakeFiles/common_obj_static.dir/MQTTTime.c.obj
  [  7%] Building C object src/CMakeFiles/common_obj_static.dir/MQTTProtocolClient.c.obj
  [ 11%] Building C object src/CMakeFiles/common_obj_static.dir/Clients.c.obj
  [ 14%] Building C object src/CMakeFiles/common_obj_static.dir/utf-8.c.obj
  [ 18%] Building C object src/CMakeFiles/common_obj_static.dir/MQTTPacket.c.obj
  [ 22%] Building C object src/CMakeFiles/common_obj_static.dir/MQTTPacketOut.c.obj
  [ 25%] Building C object src/CMakeFiles/common_obj_static.dir/Messages.c.obj
  [ 29%] Building C object src/CMakeFiles/common_obj_static.dir/Tree.c.obj
  [ 40%] Building C object src/CMakeFiles/common_obj_static.dir/MQTTPersistence.c.obj
  [ 40%] Building C object src/CMakeFiles/common_obj_static.dir/Socket.c.obj
  [ 40%] Building C object src/CMakeFiles/common_obj_static.dir/Log.c.obj
  [ 44%] Building C object src/CMakeFiles/common_obj_static.dir/Thread.c.obj
  [ 48%] Building C object src/CMakeFiles/common_obj_static.dir/MQTTProtocolOut.c.obj

  --- stderr
  CMake Warning:
    Manually-specified variables were not used by the project:

      CMAKE_ASM_COMPILER
      CMAKE_ASM_FLAGS
      CMAKE_CXX_COMPILER
      CMAKE_CXX_FLAGS


  /home/my_user/.asdf/installs/rust/1.60.0/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c: In function ‘cmpfds’:
  /home/my_user/.asdf/installs/rust/1.60.0/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:240:38: error: dereferencing pointer to incomplete type ‘struct pollfd’
    240 |    SOCKET key1 = ((struct pollfd*)p1)->fd;
        |                                      ^~
  /home/my_user/.asdf/installs/rust/1.60.0/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c: In function ‘Socket_addSocket’:
  /home/my_user/.asdf/installs/rust/1.60.0/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:267:63: error: invalid use of undefined type ‘struct pollfd’
    267 |   mod_s.fds = realloc(mod_s.fds, mod_s.nfds * sizeof(mod_s.fds[0]));
        |                                                               ^
  /home/my_user/.asdf/installs/rust/1.60.0/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:269:51: error: invalid use of undefined type ‘struct pollfd’
    269 |   mod_s.fds = malloc(mod_s.nfds * sizeof(mod_s.fds[0]));
        |                                                   ^
  /home/my_user/.asdf/installs/rust/1.60.0/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:276:11: error: invalid use of undefined type ‘struct pollfd’
    276 |  mod_s.fds[mod_s.nfds - 1].fd = newSd;
        |           ^
  /home/my_user/.asdf/installs/rust/1.60.0/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:278:11: error: invalid use of undefined type ‘struct pollfd’
    278 |  mod_s.fds[mod_s.nfds - 1].events = POLLIN | POLLOUT;
        |           ^
  /home/my_user/.asdf/installs/rust/1.60.0/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:278:37: error: ‘POLLIN’ undeclared (first use in this function)
    278 |  mod_s.fds[mod_s.nfds - 1].events = POLLIN | POLLOUT;
        |                                     ^~~~~~
  /home/my_user/.asdf/installs/rust/1.60.0/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:278:37: note: each undeclared identifier is reported only once for each function it appears in
  /home/my_user/.asdf/installs/rust/1.60.0/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:278:46: error: ‘POLLOUT’ undeclared (first use in this function)
    278 |  mod_s.fds[mod_s.nfds - 1].events = POLLIN | POLLOUT;
        |                                              ^~~~~~~
  /home/my_user/.asdf/installs/rust/1.60.0/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:284:55: error: invalid use of undefined type ‘struct pollfd’
    284 |  qsort(mod_s.fds, (size_t)mod_s.nfds, sizeof(mod_s.fds[0]), cmpfds);
        |                                                       ^
  /home/my_user/.asdf/installs/rust/1.60.0/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c: In function ‘isReady’:
  /home/my_user/.asdf/installs/rust/1.60.0/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:328:35: error: invalid use of undefined type ‘struct pollfd’
    328 |  SOCKET* socket = &mod_s.saved.fds[index].fd;
        |                                   ^
  /home/my_user/.asdf/installs/rust/1.60.0/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:332:22: error: invalid use of undefined type ‘struct pollfd’
    332 |  if ((mod_s.saved.fds[index].revents & POLLHUP) || (mod_s.saved.fds[index].revents & POLLNVAL))
        |                      ^
  /home/my_user/.asdf/installs/rust/1.60.0/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:332:40: error: ‘POLLHUP’ undeclared (first use in this function)
    332 |  if ((mod_s.saved.fds[index].revents & POLLHUP) || (mod_s.saved.fds[index].revents & POLLNVAL))
        |                                        ^~~~~~~
  /home/my_user/.asdf/installs/rust/1.60.0/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:332:68: error: invalid use of undefined type ‘struct pollfd’
    332 |  if ((mod_s.saved.fds[index].revents & POLLHUP) || (mod_s.saved.fds[index].revents & POLLNVAL))
        |                                                                    ^
  /home/my_user/.asdf/installs/rust/1.60.0/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:332:86: error: ‘POLLNVAL’ undeclared (first use in this function)
    332 |  if ((mod_s.saved.fds[index].revents & POLLHUP) || (mod_s.saved.fds[index].revents & POLLNVAL))
        |                                                                                      ^~~~~~~~
  /home/my_user/.asdf/installs/rust/1.60.0/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:335:20: error: invalid use of undefined type ‘struct pollfd’
    335 |    (mod_s.saved.fds[index].revents & POLLOUT))
        |                    ^
  /home/my_user/.asdf/installs/rust/1.60.0/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:335:38: error: ‘POLLOUT’ undeclared (first use in this function)
    335 |    (mod_s.saved.fds[index].revents & POLLOUT))
        |                                      ^~~~~~~
  /home/my_user/.asdf/installs/rust/1.60.0/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:338:24: error: invalid use of undefined type ‘struct pollfd’
    338 |   rc = (mod_s.saved.fds[index].revents & POLLIN) &&
        |                        ^
  /home/my_user/.asdf/installs/rust/1.60.0/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:338:42: error: ‘POLLIN’ undeclared (first use in this function)
    338 |   rc = (mod_s.saved.fds[index].revents & POLLIN) &&
        |                                          ^~~~~~
  /home/my_user/.asdf/installs/rust/1.60.0/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:339:21: error: invalid use of undefined type ‘struct pollfd’
    339 |     (mod_s.saved.fds[index].revents & POLLOUT) &&
        |                     ^
  /home/my_user/.asdf/installs/rust/1.60.0/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c: In function ‘Socket_getReadySocket’:
  /home/my_user/.asdf/installs/rust/1.60.0/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:494:68: error: invalid application of ‘sizeof’ to incomplete type ‘struct pollfd’
    494 |     mod_s.saved.fds = realloc(mod_s.saved.fds, mod_s.nfds * sizeof(struct pollfd));
        |                                                                    ^~~~~~
  /home/my_user/.asdf/installs/rust/1.60.0/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:496:50: error: invalid application of ‘sizeof’ to incomplete type ‘struct pollfd’
    496 |     mod_s.saved.fds = malloc(mod_s.nfds * sizeof(struct pollfd));
        |                                                  ^~~~~~
  /home/my_user/.asdf/installs/rust/1.60.0/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:498:58: error: invalid application of ‘sizeof’ to incomplete type ‘struct pollfd’
    498 |   memcpy(mod_s.saved.fds, mod_s.fds, mod_s.nfds * sizeof(struct pollfd));
        |                                                          ^~~~~~
  In file included from /home/my_user/.asdf/installs/rust/1.60.0/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:31:
  /home/my_user/.asdf/installs/rust/1.60.0/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.h:29:14: warning: implicit declaration of function ‘WSAPoll’ [-Wimplicit-function-declaration]
     29 | #define poll WSAPoll
        |              ^~~~~~~
  /home/my_user/.asdf/installs/rust/1.60.0/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:508:9: note: in expansion of macro ‘poll’
    508 |   *rc = poll(mod_s.saved.fds, mod_s.saved.nfds, timeout_ms);
        |         ^~~~
  /home/my_user/.asdf/installs/rust/1.60.0/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:543:25: error: invalid use of undefined type ‘struct pollfd’
    543 |   sock = mod_s.saved.fds[mod_s.saved.cur_fd].fd;
        |                         ^
  /home/my_user/.asdf/installs/rust/1.60.0/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c: In function ‘Socket_close’:
  /home/my_user/.asdf/installs/rust/1.60.0/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:918:71: error: invalid use of undefined type ‘struct pollfd’
    918 |  fd = bsearch(&socket, mod_s.fds, (size_t)mod_s.nfds, sizeof(mod_s.fds[0]), cmpsockfds);
        |                                                                       ^
  /home/my_user/.asdf/installs/rust/1.60.0/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:921:38: error: invalid use of undefined type ‘struct pollfd’
    921 |   struct pollfd* last_fd = &mod_s.fds[mod_s.nfds - 1];
        |                                      ^
  /home/my_user/.asdf/installs/rust/1.60.0/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:933:20: error: invalid use of undefined type ‘struct pollfd’
    933 |     memmove(fd, fd + 1, (mod_s.nfds - (fd - mod_s.fds)) * sizeof(mod_s.fds[0]));
        |                    ^
  /home/my_user/.asdf/installs/rust/1.60.0/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:933:43: error: arithmetic on pointer to an incomplete type
    933 |     memmove(fd, fd + 1, (mod_s.nfds - (fd - mod_s.fds)) * sizeof(mod_s.fds[0]));
        |                                           ^
  /home/my_user/.asdf/installs/rust/1.60.0/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:933:75: error: invalid use of undefined type ‘struct pollfd’
    933 |     memmove(fd, fd + 1, (mod_s.nfds - (fd - mod_s.fds)) * sizeof(mod_s.fds[0]));
        |                                                                           ^
  /home/my_user/.asdf/installs/rust/1.60.0/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:935:51: error: invalid use of undefined type ‘struct pollfd’
    935 |    mod_s.fds = realloc(mod_s.fds, sizeof(mod_s.fds[0]) * mod_s.nfds);
        |                                                   ^
  /home/my_user/.asdf/installs/rust/1.60.0/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c: In function ‘Socket_continueWrites’:
  /home/my_user/.asdf/installs/rust/1.60.0/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:1314:90: error: invalid use of undefined type ‘struct pollfd’
   1314 |   fd = bsearch(&socket, mod_s.saved.fds, (size_t)mod_s.saved.nfds, sizeof(mod_s.saved.fds[0]), cmpsockfds);
        |                                                                                          ^
  /home/my_user/.asdf/installs/rust/1.60.0/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:1316:22: error: ‘POLLOUT’ undeclared (first use in this function)
   1316 |   if ((fd->revents & POLLOUT) && ((rc = Socket_continueWrite(socket)) != 0))
        |                      ^~~~~~~
  make[2]: *** [src/CMakeFiles/common_obj_static.dir/build.make:188: src/CMakeFiles/common_obj_static.dir/Socket.c.obj] Erro 1
  make[2]: ** Esperando que outros processos terminem.
  make[1]: *** [CMakeFiles/Makefile2:104: src/CMakeFiles/common_obj_static.dir/all] Erro 2
  make: *** [Makefile:156: all] Erro 2
  thread 'main' panicked at '
  command did not execute successfully, got: exit status: 2

  build script failed, must exit now', /home/my_user/.asdf/installs/rust/1.60.0/registry/src/git.colasdn.top-1ecc6299db9ec823/cmake-0.1.45/src/lib.rs:894:5
  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
warning: build failed, waiting for other jobs to finish...
error: build failed

With cargo build

~/.asdf/installs/rust/1.60.0/bin/cross build --target x86_64-pc-windows-gnu --release

Error output with cross

   Compiling proc-macro2 v1.0.39
   Compiling unicode-ident v1.0.1
   Compiling syn v1.0.96
   Compiling autocfg v1.1.0
   Compiling cfg-if v1.0.0
   Compiling log v0.4.17
   Compiling winapi-x86_64-pc-windows-gnu v0.4.0
   Compiling winapi v0.3.9
   Compiling smallvec v1.8.0
   Compiling windows_x86_64_gnu v0.36.1
   Compiling scopeguard v1.1.0
   Compiling pin-project-lite v0.2.9
   Compiling libc v0.2.126
   Compiling khronos_api v3.1.0
   Compiling version_check v0.9.4
   Compiling parking_lot_core v0.9.3
   Compiling once_cell v1.12.0
   Compiling ttf-parser v0.15.1
   Compiling memchr v2.5.0
   Compiling futures-core v0.3.21
   Compiling xml-rs v0.8.4
   Compiling ab_glyph_rasterizer v0.1.5
   Compiling lazy_static v1.4.0
   Compiling futures-task v0.3.21
   Compiling parking_lot_core v0.8.5
   Compiling tinyvec_macros v0.1.0
   Compiling futures-channel v0.3.21
   Compiling nohash-hasher v0.2.0
   Compiling futures-sink v0.3.21
   Compiling cc v1.0.73
   Compiling matches v0.1.9
   Compiling futures-util v0.3.21
   Compiling pin-utils v0.1.0
   Compiling percent-encoding v2.1.0
   Compiling str-buf v1.0.6
   Compiling cty v0.2.2
   Compiling winit v0.26.1
   Compiling slab v0.4.6
   Compiling futures-io v0.3.21
   Compiling crossbeam-utils v0.8.8
   Compiling serde_derive v1.0.137
   Compiling unicode-bidi v0.3.8
   Compiling cache-padded v1.2.0
   Compiling serde v1.0.137
   Compiling bitflags v1.3.2
   Compiling serde_json v1.0.81
   Compiling event-listener v2.5.2
   Compiling widestring v0.5.1
   Compiling regex-syntax v0.6.26
   Compiling glow v0.11.2
   Compiling itoa v1.0.2
   Compiling futures-timer v3.0.2
   Compiling ryu v1.0.10
   Compiling getrandom v0.2.7
   Compiling instant v0.1.12
   Compiling tracing-core v0.1.27
   Compiling lock_api v0.4.7
   Compiling num-traits v0.2.15
   Compiling memoffset v0.6.5
   Compiling num-integer v0.1.45
   Compiling ahash v0.7.6
   Compiling tinyvec v1.6.0
   Compiling raw-window-handle v0.4.3
   Compiling form_urlencoded v1.0.1
   Compiling concurrent-queue v1.2.2
   Compiling cmake v0.1.45
   Compiling owned_ttf_parser v0.15.0
   Compiling windows-sys v0.36.1
   Compiling gl_generator v0.14.0
   Compiling error-code v2.3.1
   Compiling unicode-normalization v0.1.19
   Compiling quote v1.0.18
   Compiling paho-mqtt-sys v0.7.0
   Compiling async-channel v1.6.1
   Compiling ab_glyph v0.2.15
   Compiling crossbeam-channel v0.5.4
   Compiling aho-corasick v0.7.18
   Compiling idna v0.2.3
   Compiling regex v1.5.6
   Compiling parking_lot v0.12.1
   Compiling glutin_egl_sys v0.1.5
   Compiling glutin_wgl_sys v0.1.5
   Compiling url v2.2.2
   Compiling clipboard-win v4.4.1
   Compiling libloading v0.7.3
   Compiling webbrowser v0.7.1
error: failed to run custom build command for `paho-mqtt-sys v0.7.0`

Caused by:
  process didn't exit successfully: `/target/release/build/paho-mqtt-sys-9b3aea11c9bec0db/build-script-build` (exit status: 101)
  --- stdout
  debug:Running the bundled build for Paho C
  debug:Building for Windows
  cargo:rerun-if-changed=build.rs
  detected home dir change, cleaning out entire build directory
  running: "cmake" "/cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/" "-DCMAKE_SYSTEM_NAME=Windows" "-DPAHO_BUILD_SHARED=off" "-DPAHO_BUILD_STATIC=on" "-DPAHO_ENABLE_TESTING=off" "-DPAHO_HIGH_PERFORMANCE=on" "-DPAHO_WITH_SSL=off" "-DCMAKE_INSTALL_PREFIX=/target/x86_64-pc-windows-gnu/release/build/paho-mqtt-sys-f4a6b903351f2e74/out" "-DCMAKE_C_FLAGS= -ffunction-sections -fdata-sections -m64" "-DCMAKE_C_COMPILER=/usr/bin/x86_64-w64-mingw32-gcc-posix" "-DCMAKE_CXX_FLAGS= -ffunction-sections -fdata-sections -m64" "-DCMAKE_CXX_COMPILER=/usr/bin/x86_64-w64-mingw32-g++-posix" "-DCMAKE_ASM_FLAGS= -ffunction-sections -fdata-sections -m64" "-DCMAKE_ASM_COMPILER=/usr/bin/x86_64-w64-mingw32-gcc-posix" "-DCMAKE_BUILD_TYPE=Release"
  -- The C compiler identification is GNU 7.3.0
  -- Detecting C compiler ABI info
  -- Detecting C compiler ABI info - done
  -- Check for working C compiler: /usr/bin/x86_64-w64-mingw32-gcc-posix - skipped
  -- Detecting C compile features
  -- Detecting C compile features - done
  -- CMake version: 3.23.1
  -- CMake system name: Windows
  -- Timestamp is 2022-08-12T21:13:11Z
  -- Configuring done
  -- Generating done
  -- Build files have been written to: /target/x86_64-pc-windows-gnu/release/build/paho-mqtt-sys-f4a6b903351f2e74/out/build
  running: "cmake" "--build" "." "--target" "install" "--config" "Release" "--"
  [  3%] Building C object src/CMakeFiles/common_obj_static.dir/MQTTTime.c.obj
  [  7%] Building C object src/CMakeFiles/common_obj_static.dir/MQTTProtocolClient.c.obj
  [ 11%] Building C object src/CMakeFiles/common_obj_static.dir/Clients.c.obj
  [ 14%] Building C object src/CMakeFiles/common_obj_static.dir/utf-8.c.obj
  [ 18%] Building C object src/CMakeFiles/common_obj_static.dir/MQTTPacket.c.obj
  [ 22%] Building C object src/CMakeFiles/common_obj_static.dir/MQTTPacketOut.c.obj
  [ 25%] Building C object src/CMakeFiles/common_obj_static.dir/Messages.c.obj
  [ 29%] Building C object src/CMakeFiles/common_obj_static.dir/Tree.c.obj
  [ 33%] Building C object src/CMakeFiles/common_obj_static.dir/Socket.c.obj
  src/CMakeFiles/common_obj_static.dir/build.make:187: recipe for target 'src/CMakeFiles/common_obj_static.dir/Socket.c.obj' failed
  CMakeFiles/Makefile2:103: recipe for target 'src/CMakeFiles/common_obj_static.dir/all' failed
  Makefile:155: recipe for target 'all' failed

  --- stderr
  fatal: not a git repository (or any parent up to mount point /)
  Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).
  CMake Warning:
    Manually-specified variables were not used by the project:

      CMAKE_ASM_COMPILER
      CMAKE_ASM_FLAGS
      CMAKE_CXX_COMPILER
      CMAKE_CXX_FLAGS


  /cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c: In function 'cmpfds':
  /cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:240:38: error: dereferencing pointer to incomplete type 'struct pollfd'
      SOCKET key1 = ((struct pollfd*)p1)->fd;
                                        ^~
  /cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c: In function 'Socket_addSocket':
  /cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:267:63: error: invalid use of undefined type 'struct pollfd'
     mod_s.fds = realloc(mod_s.fds, mod_s.nfds * sizeof(mod_s.fds[0]));
                                                                 ^
  /cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:269:51: error: invalid use of undefined type 'struct pollfd'
     mod_s.fds = malloc(mod_s.nfds * sizeof(mod_s.fds[0]));
                                                     ^
  /cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:276:11: error: invalid use of undefined type 'struct pollfd'
    mod_s.fds[mod_s.nfds - 1].fd = newSd;
             ^
  /cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:278:11: error: invalid use of undefined type 'struct pollfd'
    mod_s.fds[mod_s.nfds - 1].events = POLLIN | POLLOUT;
             ^
  /cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:278:37: error: 'POLLIN' undeclared (first use in this function); did you mean 'POINT'?
    mod_s.fds[mod_s.nfds - 1].events = POLLIN | POLLOUT;
                                       ^~~~~~
                                       POINT
  /cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:278:37: note: each undeclared identifier is reported only once for each function it appears in
  /cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:278:46: error: 'POLLOUT' undeclared (first use in this function); did you mean 'POLLIN'?
    mod_s.fds[mod_s.nfds - 1].events = POLLIN | POLLOUT;
                                                ^~~~~~~
                                                POLLIN
  /cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:284:55: error: invalid use of undefined type 'struct pollfd'
    qsort(mod_s.fds, (size_t)mod_s.nfds, sizeof(mod_s.fds[0]), cmpfds);
                                                         ^
  /cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c: In function 'isReady':
  /cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:328:35: error: invalid use of undefined type 'struct pollfd'
    SOCKET* socket = &mod_s.saved.fds[index].fd;
                                     ^
  /cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:332:22: error: invalid use of undefined type 'struct pollfd'
    if ((mod_s.saved.fds[index].revents & POLLHUP) || (mod_s.saved.fds[index].revents & POLLNVAL))
                        ^
  /cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:332:40: error: 'POLLHUP' undeclared (first use in this function)
    if ((mod_s.saved.fds[index].revents & POLLHUP) || (mod_s.saved.fds[index].revents & POLLNVAL))
                                          ^~~~~~~
  /cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:332:68: error: invalid use of undefined type 'struct pollfd'
    if ((mod_s.saved.fds[index].revents & POLLHUP) || (mod_s.saved.fds[index].revents & POLLNVAL))
                                                                      ^
  /cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:332:86: error: 'POLLNVAL' undeclared (first use in this function); did you mean 'POLLHUP'?
    if ((mod_s.saved.fds[index].revents & POLLHUP) || (mod_s.saved.fds[index].revents & POLLNVAL))
                                                                                        ^~~~~~~~
                                                                                        POLLHUP
  /cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:335:20: error: invalid use of undefined type 'struct pollfd'
      (mod_s.saved.fds[index].revents & POLLOUT))
                      ^
  /cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:335:38: error: 'POLLOUT' undeclared (first use in this function); did you mean 'POLLHUP'?
      (mod_s.saved.fds[index].revents & POLLOUT))
                                        ^~~~~~~
                                        POLLHUP
  /cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:338:24: error: invalid use of undefined type 'struct pollfd'
     rc = (mod_s.saved.fds[index].revents & POLLIN) &&
                          ^
  /cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:338:42: error: 'POLLIN' undeclared (first use in this function); did you mean 'POLLOUT'?
     rc = (mod_s.saved.fds[index].revents & POLLIN) &&
                                            ^~~~~~
                                            POLLOUT
  /cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:339:21: error: invalid use of undefined type 'struct pollfd'
       (mod_s.saved.fds[index].revents & POLLOUT) &&
                       ^
  /cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c: In function 'Socket_getReadySocket':
  /cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:494:68: error: invalid application of 'sizeof' to incomplete type 'struct pollfd'
       mod_s.saved.fds = realloc(mod_s.saved.fds, mod_s.nfds * sizeof(struct pollfd));
                                                                      ^~~~~~
  /cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:496:50: error: invalid application of 'sizeof' to incomplete type 'struct pollfd'
       mod_s.saved.fds = malloc(mod_s.nfds * sizeof(struct pollfd));
                                                    ^~~~~~
  /cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:498:58: error: invalid application of 'sizeof' to incomplete type 'struct pollfd'
     memcpy(mod_s.saved.fds, mod_s.fds, mod_s.nfds * sizeof(struct pollfd));
                                                            ^~~~~~
  In file included from /cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:31:0:
  /cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.h:29:14: warning: implicit declaration of function 'WSAPoll'; did you mean 'WSANtohl'? [-Wimplicit-function-declaration]
   #define poll WSAPoll
                ^
  /cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:508:9: note: in expansion of macro 'poll'
     *rc = poll(mod_s.saved.fds, mod_s.saved.nfds, timeout_ms);
           ^~~~
  /cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:543:25: error: invalid use of undefined type 'struct pollfd'
     sock = mod_s.saved.fds[mod_s.saved.cur_fd].fd;
                           ^
  /cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c: In function 'Socket_close':
  /cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:918:71: error: invalid use of undefined type 'struct pollfd'
    fd = bsearch(&socket, mod_s.fds, (size_t)mod_s.nfds, sizeof(mod_s.fds[0]), cmpsockfds);
                                                                         ^
  /cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:921:38: error: invalid use of undefined type 'struct pollfd'
     struct pollfd* last_fd = &mod_s.fds[mod_s.nfds - 1];
                                        ^
  /cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:933:20: error: invalid use of undefined type 'struct pollfd'
       memmove(fd, fd + 1, (mod_s.nfds - (fd - mod_s.fds)) * sizeof(mod_s.fds[0]));
                      ^
  /cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:933:43: error: arithmetic on pointer to an incomplete type
       memmove(fd, fd + 1, (mod_s.nfds - (fd - mod_s.fds)) * sizeof(mod_s.fds[0]));
                                             ^
  /cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:933:75: error: invalid use of undefined type 'struct pollfd'
       memmove(fd, fd + 1, (mod_s.nfds - (fd - mod_s.fds)) * sizeof(mod_s.fds[0]));
                                                                             ^
  /cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:935:51: error: invalid use of undefined type 'struct pollfd'
      mod_s.fds = realloc(mod_s.fds, sizeof(mod_s.fds[0]) * mod_s.nfds);
                                                     ^
  /cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c: In function 'Socket_continueWrites':
  /cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:1314:90: error: invalid use of undefined type 'struct pollfd'
     fd = bsearch(&socket, mod_s.saved.fds, (size_t)mod_s.saved.nfds, sizeof(mod_s.saved.fds[0]), cmpsockfds);
                                                                                            ^
  /cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.0/paho.mqtt.c/src/Socket.c:1316:22: error: 'POLLOUT' undeclared (first use in this function); did you mean 'PFLOAT'?
     if ((fd->revents & POLLOUT) && ((rc = Socket_continueWrite(socket)) != 0))
                        ^~~~~~~
                        PFLOAT
  make[2]: *** [src/CMakeFiles/common_obj_static.dir/Socket.c.obj] Error 1
  make[1]: *** [src/CMakeFiles/common_obj_static.dir/all] Error 2
  make: *** [all] Error 2
  thread 'main' panicked at '
  command did not execute successfully, got: exit status: 2

  build script failed, must exit now', /cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/cmake-0.1.45/src/lib.rs:894:5
  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
warning: build failed, waiting for other jobs to finish...
error: build failed

[myhrmans]

Same issue here

[brunoluizkatz-NETZSCH]

@fpagliughi with release v0.12.0 this was fixed?

[fpagliughi]

Honestly, I have no idea. I've been trying to figure out MinGW on Windows for another open-source C++ library, and am having no luck with it at all!

[myhrmans]

I tried the fix found here without any success.
0.12.0 till uses 0.7.0 but specifying in the cargo.toml file to use 0.7.2 result in this error:

error: failed to run custom build command for `paho-mqtt-sys v0.7.2`

Caused by:
  process didn't exit successfully: `/home/mmyhrman/repos/dd-shell-executer/target/debug/build/paho-mqtt-sys-3be531eb1a7f9d60/build-script-build` (exit status: 101)
  --- stdout
  debug:Running the bundled build for Paho C
  debug:Building for Windows
  cargo:rerun-if-changed=build.rs
  CMAKE_TOOLCHAIN_FILE_x86_64-pc-windows-gnu = None
  CMAKE_TOOLCHAIN_FILE_x86_64_pc_windows_gnu = None
  TARGET_CMAKE_TOOLCHAIN_FILE = None
  CMAKE_TOOLCHAIN_FILE = None
  CMAKE_GENERATOR_x86_64-pc-windows-gnu = None
  CMAKE_GENERATOR_x86_64_pc_windows_gnu = None
  TARGET_CMAKE_GENERATOR = None
  CMAKE_GENERATOR = None
  CMAKE_PREFIX_PATH_x86_64-pc-windows-gnu = None
  CMAKE_PREFIX_PATH_x86_64_pc_windows_gnu = None
  TARGET_CMAKE_PREFIX_PATH = None
  CMAKE_PREFIX_PATH = None
  CMAKE_x86_64-pc-windows-gnu = None
  CMAKE_x86_64_pc_windows_gnu = None
  TARGET_CMAKE = None
  CMAKE = None
  running: "cmake" "/home/mmyhrman/.cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.2/paho.mqtt.c/" "-DCMAKE_RC_COMPILER=/bin/x86_64-w64-mingw32-windres" "-DPAHO_BUILD_SHARED=off" "-DPAHO_BUILD_STATIC=on" "-DPAHO_ENABLE_TESTING=off" "-DPAHO_HIGH_PERFORMANCE=on" "-DPAHO_USE_SELECT=on" "-DPAHO_WITH_SSL=on" "-DOPENSSL_ROOT_DIR=/home/mmyhrman/repos/dd-shell-executer/target/x86_64-pc-windows-gnu/debug/build/openssl-sys-2973f7a70fe01be6/out/openssl-build/install" "-DCMAKE_SYSTEM_NAME=Windows" "-DCMAKE_SYSTEM_PROCESSOR=AMD64" "-DCMAKE_INSTALL_PREFIX=/home/mmyhrman/repos/dd-shell-executer/target/x86_64-pc-windows-gnu/debug/build/paho-mqtt-sys-6b0b6a65e2eb93ce/out" "-DCMAKE_C_FLAGS= -ffunction-sections -fdata-sections -m64" "-DCMAKE_C_COMPILER=/bin/x86_64-w64-mingw32-gcc" "-DCMAKE_CXX_FLAGS= -ffunction-sections -fdata-sections -m64" "-DCMAKE_CXX_COMPILER=/bin/x86_64-w64-mingw32-g++" "-DCMAKE_ASM_FLAGS= -ffunction-sections -fdata-sections -m64" "-DCMAKE_ASM_COMPILER=/bin/x86_64-w64-mingw32-gcc" "-DCMAKE_BUILD_TYPE=Debug"
  -- The C compiler identification is GNU 10.0.0
  -- Detecting C compiler ABI info
  -- Detecting C compiler ABI info - done
  -- Check for working C compiler: /bin/x86_64-w64-mingw32-gcc - skipped
  -- Detecting C compile features
  -- Detecting C compile features - done
  -- CMake version: 3.22.1
  -- CMake system name: Windows
  -- Timestamp is 2023-01-19T08:24:30Z
  -- Found OpenSSL: /home/mmyhrman/repos/dd-shell-executer/target/x86_64-pc-windows-gnu/debug/build/openssl-sys-2973f7a70fe01be6/out/openssl-build/install/lib/libcrypto.a (found version "1.1.1s")  
  -- Configuring done
  -- Generating done
  -- Build files have been written to: /home/mmyhrman/repos/dd-shell-executer/target/x86_64-pc-windows-gnu/debug/build/paho-mqtt-sys-6b0b6a65e2eb93ce/out/build
  running: "cmake" "--build" "." "--target" "install" "--config" "Debug"
  [  1%] Building C object src/CMakeFiles/common_ssl_obj_static.dir/MQTTTime.c.obj
  [  3%] Building C object src/CMakeFiles/common_ssl_obj_static.dir/MQTTProtocolClient.c.obj
  [  5%] Building C object src/CMakeFiles/common_ssl_obj_static.dir/utf-8.c.obj
  [  7%] Building C object src/CMakeFiles/common_ssl_obj_static.dir/Clients.c.obj
  [  8%] Building C object src/CMakeFiles/common_ssl_obj_static.dir/MQTTPacket.c.obj
  [ 10%] Building C object src/CMakeFiles/common_ssl_obj_static.dir/MQTTPacketOut.c.obj
  [ 12%] Building C object src/CMakeFiles/common_ssl_obj_static.dir/Messages.c.obj
  [ 14%] Building C object src/CMakeFiles/common_obj_static.dir/MQTTTime.c.obj
  [ 16%] Building C object src/CMakeFiles/common_obj_static.dir/MQTTProtocolClient.c.obj
  [ 17%] Building C object src/CMakeFiles/common_ssl_obj_static.dir/Tree.c.obj
  [ 19%] Building C object src/CMakeFiles/common_obj_static.dir/Clients.c.obj
  [ 21%] Building C object src/CMakeFiles/common_ssl_obj_static.dir/Log.c.obj
  [ 23%] Building C object src/CMakeFiles/common_ssl_obj_static.dir/Socket.c.obj
  [ 25%] Building C object src/CMakeFiles/common_ssl_obj_static.dir/MQTTPersistence.c.obj
  [ 26%] Building C object src/CMakeFiles/common_ssl_obj_static.dir/Thread.c.obj
  [ 28%] Building C object src/CMakeFiles/common_ssl_obj_static.dir/MQTTProtocolOut.c.obj
  [ 30%] Building C object src/CMakeFiles/common_ssl_obj_static.dir/MQTTPersistenceDefault.c.obj
  [ 32%] Building C object src/CMakeFiles/common_obj_static.dir/utf-8.c.obj
  [ 33%] Building C object src/CMakeFiles/common_ssl_obj_static.dir/SocketBuffer.c.obj
  [ 35%] Building C object src/CMakeFiles/common_obj_static.dir/MQTTPacket.c.obj
  [ 37%] Building C object src/CMakeFiles/common_ssl_obj_static.dir/LinkedList.c.obj
  [ 39%] Building C object src/CMakeFiles/common_obj_static.dir/MQTTPacketOut.c.obj
  [ 41%] Building C object src/CMakeFiles/common_obj_static.dir/Messages.c.obj
  [ 42%] Building C object src/CMakeFiles/common_obj_static.dir/Tree.c.obj
  [ 44%] Building C object src/CMakeFiles/common_obj_static.dir/Socket.c.obj
  [ 46%] Building C object src/CMakeFiles/common_obj_static.dir/MQTTPersistence.c.obj
  [ 48%] Building C object src/CMakeFiles/common_obj_static.dir/Log.c.obj
  [ 50%] Building C object src/CMakeFiles/common_obj_static.dir/Thread.c.obj
  [ 51%] Building C object src/CMakeFiles/common_obj_static.dir/MQTTProtocolOut.c.obj
  [ 53%] Building C object src/CMakeFiles/common_obj_static.dir/MQTTPersistenceDefault.c.obj
  [ 55%] Building C object src/CMakeFiles/common_obj_static.dir/SocketBuffer.c.obj
  [ 57%] Building C object src/CMakeFiles/common_obj_static.dir/LinkedList.c.obj
  [ 58%] Building C object src/CMakeFiles/common_obj_static.dir/MQTTProperties.c.obj
  [ 60%] Building C object src/CMakeFiles/common_obj_static.dir/MQTTReasonCodes.c.obj

  --- stderr
  fatal: not a git repository (or any of the parent directories): .git
  CMake Warning:
    Manually-specified variables were not used by the project:

      CMAKE_ASM_COMPILER
      CMAKE_ASM_FLAGS
      CMAKE_CXX_COMPILER
      CMAKE_CXX_FLAGS


  /home/mmyhrman/.cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.2/paho.mqtt.c/src/Socket.c:195:5: error: conflicting types for ‘Socket_addSocket’
    195 | int Socket_addSocket(int newSd)
        |     ^~~~~~~~~~~~~~~~
  /home/mmyhrman/.cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.2/paho.mqtt.c/src/Socket.c:56:5: note: previous declaration of ‘Socket_addSocket’ was here
     56 | int Socket_addSocket(SOCKET newSd);
        |     ^~~~~~~~~~~~~~~~
  /home/mmyhrman/.cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.2/paho.mqtt.c/src/Socket.c:356:5: error: conflicting types for ‘Socket_getReadySocket’
    356 | int Socket_getReadySocket(int more_work, int timeout, mutex_type mutex, int* rc)
        |     ^~~~~~~~~~~~~~~~~~~~~
  In file included from /home/mmyhrman/.cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.2/paho.mqtt.c/src/Socket.c:31:
  /home/mmyhrman/.cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.2/paho.mqtt.c/src/Socket.h:139:8: note: previous declaration of ‘Socket_getReadySocket’ was here
    139 | SOCKET Socket_getReadySocket(int more_work, int timeout, mutex_type mutex, int* rc);
        |        ^~~~~~~~~~~~~~~~~~~~~
  gmake[2]: *** [src/CMakeFiles/common_ssl_obj_static.dir/build.make:197: src/CMakeFiles/common_ssl_obj_static.dir/Socket.c.obj] Error 1
  gmake[2]: *** Waiting for unfinished jobs....
  /home/mmyhrman/.cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.2/paho.mqtt.c/src/Socket.c:195:5: error: conflicting types for ‘Socket_addSocket’
    195 | int Socket_addSocket(int newSd)
        |     ^~~~~~~~~~~~~~~~
  /home/mmyhrman/.cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.2/paho.mqtt.c/src/Socket.c:56:5: note: previous declaration of ‘Socket_addSocket’ was here
     56 | int Socket_addSocket(SOCKET newSd);
        |     ^~~~~~~~~~~~~~~~
  /home/mmyhrman/.cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.2/paho.mqtt.c/src/Socket.c:356:5: error: conflicting types for ‘Socket_getReadySocket’
    356 | int Socket_getReadySocket(int more_work, int timeout, mutex_type mutex, int* rc)
        |     ^~~~~~~~~~~~~~~~~~~~~
  In file included from /home/mmyhrman/.cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.2/paho.mqtt.c/src/Socket.c:31:
  /home/mmyhrman/.cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/paho-mqtt-sys-0.7.2/paho.mqtt.c/src/Socket.h:139:8: note: previous declaration of ‘Socket_getReadySocket’ was here
    139 | SOCKET Socket_getReadySocket(int more_work, int timeout, mutex_type mutex, int* rc);
        |        ^~~~~~~~~~~~~~~~~~~~~
  gmake[2]: *** [src/CMakeFiles/common_obj_static.dir/build.make:188: src/CMakeFiles/common_obj_static.dir/Socket.c.obj] Error 1
  gmake[2]: *** Waiting for unfinished jobs....
  gmake[1]: *** [CMakeFiles/Makefile2:190: src/CMakeFiles/common_ssl_obj_static.dir/all] Error 2
  gmake[1]: *** Waiting for unfinished jobs....
  gmake[1]: *** [CMakeFiles/Makefile2:112: src/CMakeFiles/common_obj_static.dir/all] Error 2
  gmake: *** [Makefile:156: all] Error 2
  thread 'main' panicked at '
  command did not execute successfully, got: exit status: 2

  build script failed, must exit now', /home/mmyhrman/.cargo/registry/src/git.colasdn.top-1ecc6299db9ec823/cmake-0.1.49/src/lib.rs:1104:5
  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace```

[anselanza]

What worked for me:

In my library Cargo.toml:

[dependencies]
paho-mqtt = { version = "0.12.1", default-features=false, features=["bundled"] }

In ./cargo/config:

[target.x86_64-pc-windows-gnu]
linker = "x86_64-w64-mingw32-gcc"
ar = "x86_64-w64-mingw32-gcc-ar"

Then cargo build --target=x86_64-pc-windows-gnu appears to succeed.

[JosuGZ]

I'm using cross-rs and I have the same issue.

[msdrigg]

Same issue for me

[msdrigg]

Appears to be related to these two issues.

eclipse-paho/paho.mqtt.cpp#123
eclipse-paho/paho.mqtt.c#1239

As it currently stands, there isn't a cygwin rust target (rust-lang/rust#79854) so were stuck here until paho.mqtt.cpp or rust gets patched

[msdrigg]

For others finding this and not having a solution, I would recommend instead targeting x86_64-pc-window-msvc and using https://github.com/rust-cross/cargo-xwin to do it. That is how I was able to work around this problem

[mati865]

This doesn't look like Rust issue. Seems like there is a bug in mqtt making it not build with MinGW.