offload: `PluginManager.h:16:10: fatal error: 'PluginInterface.h' file not found`

[sylvestre]

On debian sid on i386

FAILED: offload/src/CMakeFiles/omptarget.dir/omptarget.cpp.o 
/build/source/build-llvm/bin/clang++ --target=i386-linux-gnu -DDEBUG_PREFIX=\"omptarget\" -DENABLED_OFFLOAD_PLUGINS="" -DTARGET_NAME=omptarget -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/build/source/llvm/include -I/build/source/build-llvm/include -I/build/source/offload/include -I/build/source/build-llvm/runtimes/runtimes-bins/offload/include -fstack-protector-strong -Wformat -Werror=format-security -Wno-unused-command-line-argument -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -fdebug-prefix-map=/build/source/build-llvm/runtimes/runtimes-bins=../../../ -fdebug-prefix-map=/build/source/= -no-canonical-prefixes -ffile-prefix-map=/build/source/build-llvm/runtimes/runtimes-bins=../../../ -ffile-prefix-map=/build/source/= -no-canonical-prefixes -O3 -DNDEBUG -std=c++17 -fPIC  -fno-exceptions -funwind-tables -fno-exceptions -MD -MT offload/src/CMakeFiles/omptarget.dir/omptarget.cpp.o -MF offload/src/CMakeFiles/omptarget.dir/omptarget.cpp.o.d -o offload/src/CMakeFiles/omptarget.dir/omptarget.cpp.o -c /build/source/offload/src/omptarget.cpp
In file included from /build/source/offload/src/omptarget.cpp:15:
In file included from /build/source/offload/include/OffloadPolicy.h:17:
/build/source/offload/include/PluginManager.h:16:10: fatal error: 'PluginInterface.h' file not found
   16 | #include "PluginInterface.h"
      |          ^~~~~~~~~~~~~~~~~~~
1 error generated.

[llvmbot]

@llvm/issue-subscribers-offload

Author: Sylvestre Ledru (sylvestre)

On debian sid: ```

FAILED: offload/src/CMakeFiles/omptarget.dir/omptarget.cpp.o
/build/source/build-llvm/bin/clang++ --target=i386-linux-gnu -DDEBUG_PREFIX="omptarget" -DENABLED_OFFLOAD_PLUGINS="" -DTARGET_NAME=omptarget -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/build/source/llvm/include -I/build/source/build-llvm/include -I/build/source/offload/include -I/build/source/build-llvm/runtimes/runtimes-bins/offload/include -fstack-protector-strong -Wformat -Werror=format-security -Wno-unused-command-line-argument -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -fdebug-prefix-map=/build/source/build-llvm/runtimes/runtimes-bins=../../../ -fdebug-prefix-map=/build/source/= -no-canonical-prefixes -ffile-prefix-map=/build/source/build-llvm/runtimes/runtimes-bins=../../../ -ffile-prefix-map=/build/source/= -no-canonical-prefixes -O3 -DNDEBUG -std=c++17 -fPIC -fno-exceptions -funwind-tables -fno-exceptions -MD -MT offload/src/CMakeFiles/omptarget.dir/omptarget.cpp.o -MF offload/src/CMakeFiles/omptarget.dir/omptarget.cpp.o.d -o offload/src/CMakeFiles/omptarget.dir/omptarget.cpp.o -c /build/source/offload/src/omptarget.cpp
In file included from /build/source/offload/src/omptarget.cpp:15:
In file included from /build/source/offload/include/OffloadPolicy.h:17:
/build/source/offload/include/PluginManager.h:16:10: fatal error: 'PluginInterface.h' file not found
16 | #include "PluginInterface.h"
| ^~~~~~~~~~~~~~~~~~~
1 error generated.

</details>

[jhuber6]

Hm, it's not including the plugins directory. I believe it inherits that from including one of the plugins, so maybe none of them are being built? How was i386 used previously? My understanding was that we only supported 64-bit systems.