8.0 regression: Search to crt*.o fails on mips64el

[sylvestre]

Bugzilla Link	41204
Resolution	FIXED
Resolved on	Apr 22, 2019 20:33
Version	8.0
OS	Linux
Blocks	#40566
CC	@efriedma-quic,@zygoloid,@atanasyan,@tstellar
Fixed by commit(s)	r357506 r358947

Extended Description

With foo.c
int main(){
return 0;
}
$ /clang foo.c -v
/usr/bin/ld: cannot find crtn.o: No such file or directory

With clang-7 on a Linux mips64el:
"/usr/bin/ld" --build-id --eh-frame-hdr -m elf64ltsmip -dynamic-linker /lib64/ld.so.1 -o a.out /usr/bin/../lib/gcc/mips64el-linux-gnuabi64/8/../../../mips64el-linux-gnuabi64/crt1.o /usr/bin/../lib/gcc/mips64el-linux-gnuabi64/8/../../../mips64el-linux-gnuabi64/crti.o /usr/bin/../lib/gcc/mips64el-linux-gnuabi64/8/crtbegin.o -L/usr/bin/../lib/gcc/mips64el-linux-gnuabi64/8 -L/usr/bin/../lib/gcc/mips64el-linux-gnuabi64/8/../../../mips64el-linux-gnuabi64 -L/lib/mips64el-linux-gnuabi64 -L/lib/../lib64 -L/usr/lib/mips64el-linux-gnuabi64 -L/usr/bin/../lib/gcc/mips64el-linux-gnuabi64/8 -L/usr/bin/../lib/gcc/mips64el-linux-gnuabi64/8/../../.. -L/usr/lib/llvm-7/bin/../lib -L/lib -L/usr/lib /tmp/foo-13e8d5.o -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed /usr/bin/../lib/gcc/mips64el-linux-gnuabi64/8/crtend.o /usr/bin/../lib/gcc/mips64el-linux-gnuabi64/8/../../../mips64el-linux-gnuabi64/crtn.o

with clang-8:
"/usr/bin/ld" --build-id --eh-frame-hdr -m elf64ltsmip -dynamic-linker /lib64/ld.so.1 -o a.out crt1.o crti.o /usr/lib/gcc/mips64el-linux-gnuabi64/8/crtbegin.o -L/usr/lib/gcc/mips64el-linux-gnuabi64/8 -L/lib/../lib64 -L/usr/lib/gcc/mips64el-linux-gnuabi64/8 -L/usr/lib/gcc/mips64el-linux-gnuabi64/8/../../.. -L/home/sylvestre/llvm-toolchain-8-8~+rc5/build-llvm/bin/../lib -L/lib -L/usr/lib /tmp/foo-05b53c.o -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed /usr/lib/gcc/mips64el-linux-gnuabi64/8/crtend.o crtn.o

[sylvestre]

I had to write this patch to fix something else before:
https://reviews.llvm.org/D59702

[atanasyan]

1. How do you build the clang? What command line options do you use?
2. Could you run both clang 7 and clang 8 with the -v command line flag and provide the output?

[atanasyan]

And one more question - what OS (name/version) do you use?

[sylvestre]

This is on Debian unstable.
Full log:
https://buildd.debian.org/status/fetch.php?pkg=llvm-toolchain-8&arch=mips64el&ver=1%3A8-1&stamp=1553148429&raw=0

Building with a stage2 mode with args:

$CMAKE_BIN ../
-DCMAKE_INSTALL_PREFIX=/usr/lib/llvm-8
-DCMAKE_VERBOSE_MAKEFILE=ON
-DCMAKE_BUILD_TYPE=RelWithDebInfo
-DCMAKE_CXX_FLAGS_RELWITHDEBINFO="-O2 -DNDEBUG -g1"
-DBOOTSTRAP_CMAKE_CXX_FLAGS=' -fPIC -Wno-unused-command-line-argument -Wno-unknown-warning-option '
-DBOOTSTRAP_CMAKE_C_FLAGS=' -fPIC -Wno-unused-command-line-argument -Wno-unknown-warning-option '
-DLLVM_LINK_LLVM_DYLIB=ON
-DLLVM_INSTALL_UTILS=ON
-DLLVM_VERSION_SUFFIX=
-DLLVM_ENABLE_SPHINX=ON
-DSPHINX_WARNINGS_AS_ERRORS=OFF
-DLLVM_BUILD_LLVM_DYLIB=ON
-DLLVM_ENABLE_RTTI=ON
-DLLVM_ENABLE_FFI=ON
-DLLVM_USE_PERF=yes
-DLIBCLANG_LIBRARY_VERSION=1
-DENABLE_LINKER_BUILD_ID=ON
-DPOLLY_BUNDLED_JSONCPP=OFF
-DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD="WebAssembly;AVR"
-DCLANG_ENABLE_BOOTSTRAP=ON
-DLLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN=ON
-DCLANG_VENDOR=Debian
-DCLANG_BOOTSTRAP_PASSTHROUGH="CMAKE_INSTALL_PREFIX;CMAKE_VERBOSE_MAKEFILE;CMAKE_BUILD_TYPE;CMAKE_CXX_FLAGS_RELWITHDEBINFO;LLVM_LINK_LLVM_DYLIB;LLVM_INSTALL_UTILS;LLVM_VERSION_SUFFIX;LLVM_ENABLE_SPHINX;SPHINX_WARNINGS_AS_ERRORS;LLVM_BUILD_LLVM_DYLIB;LLVM_ENABLE_RTTI;LLVM_ENABLE_FFI;LIBCLANG_LIBRARY_VERSION;ENABLE_LINKER_BUILD_ID;POLLY_BUNDLED_JSONCPP;LLVM_EXPERIMENTAL_TARGETS_TO_BUILD;LLVM_USE_PERF;LLVM_ENABLE_ASSERTIONS;LLVM_BINUTILS_INCDIR;LLVM_HOST_TRIPLE;;LLVM_COMPILER_CHECKED;COMPILER_RT_BUILD_BUILTINS;LIBOMP_LIBFLAGS;CMAKE_SHARED_LINKER_FLAGS"

Full log with clang-8:
clang foo.c -v
Debian clang version 8.0.0-+rc5-1 (tags/RELEASE_800/rc5) (based on LLVM 8.0.0)
Target: mips64el-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/sylvestre/llvm-toolchain-8-8~+rc5/./build-llvm/bin
Found candidate GCC installation: /usr/lib/gcc/mips64el-linux-gnuabi64/8
Selected GCC installation: /usr/lib/gcc/mips64el-linux-gnuabi64/8
Candidate multilib: .;
Selected multilib: .;
crt1.o
crt1.o
"/home/sylvestre/llvm-toolchain-8-8~+rc5/build-llvm/bin/clang-8" -cc1 -triple mips64el-unknown-linux-gnu -emit-obj -mrelax-all -disable-free -disable-llvm-verifier -discard-value-names -main-file-name foo.c -mrelocation-model pic -pic-level 1 -mthread-model posix -mdisable-fp-elim -fmath-errno -masm-verbose -mconstructor-aliases -fuse-init-array -target-cpu mips64r2 -target-feature -noabicalls -target-abi n64 -mfloat-abi hard -dwarf-column-info -debugger-tuning=gdb -v -resource-dir /home/sylvestre/llvm-toolchain-8-8~+rc5/build-llvm/lib/clang/8.0.0 -internal-isystem /usr/local/include -internal-isystem /home/sylvestre/llvm-toolchain-8-8~+rc5/build-llvm/lib/clang/8.0.0/include -internal-externc-isystem /usr/include/mips64el-linux-gnuabi64 -internal-externc-isystem /include -internal-externc-isystem /usr/include -fdebug-compilation-dir /home/sylvestre/llvm-toolchain-8-8~+rc5 -ferror-limit 19 -fmessage-length 80 -fobjc-runtime=gcc -fdiagnostics-show-option -fcolor-diagnostics -o /tmp/foo-8b5ddb.o -x c foo.c -faddrsig
clang -cc1 version 8.0.0 based upon LLVM 8.0.0 default target mips64el-unknown-linux-gnu
ignoring nonexistent directory "/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/local/include
/home/sylvestre/llvm-toolchain-8-8~+rc5/build-llvm/lib/clang/8.0.0/include
/usr/include/mips64el-linux-gnuabi64
/usr/include
End of search list.
"/usr/bin/ld" --build-id --eh-frame-hdr -m elf64ltsmip -dynamic-linker /lib64/ld.so.1 -o a.out crt1.o crti.o /usr/lib/gcc/mips64el-linux-gnuabi64/8/crtbegin.o -L/usr/lib/gcc/mips64el-linux-gnuabi64/8 -L/lib/../lib64 -L/usr/lib/gcc/mips64el-linux-gnuabi64/8 -L/usr/lib/gcc/mips64el-linux-gnuabi64/8/../../.. -L/home/sylvestre/llvm-toolchain-8-8~+rc5/build-llvm/bin/../lib -L/lib -L/usr/lib /tmp/foo-8b5ddb.o -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed /usr/lib/gcc/mips64el-linux-gnuabi64/8/crtend.o crtn.o
/usr/bin/ld: cannot find crt1.o: No such file or directory
/usr/bin/ld: cannot find crti.o: No such file or directory
clang-8: error: linker command failed with exit code 1 (use -v to see invocation)

---

clang-7
clang-7 foo.c -v
clang version 7.0.1-8 (tags/RELEASE_701/final)
Target: mips64el-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
Found candidate GCC installation: /usr/bin/../lib/gcc/mips64el-linux-gnuabi64/8
Found candidate GCC installation: /usr/lib/gcc/mips64el-linux-gnuabi64/8
Selected GCC installation: /usr/bin/../lib/gcc/mips64el-linux-gnuabi64/8
Candidate multilib: .;
Selected multilib: .;
"/usr/lib/llvm-7/bin/clang" -cc1 -triple mips64el-unknown-linux-gnu -S -disable-free -disable-llvm-verifier -discard-value-names -main-file-name foo.c -mrelocation-model pic -pic-level 1 -mthread-model posix -mdisable-fp-elim -fmath-errno -no-integrated-as -mconstructor-aliases -fuse-init-array -target-cpu mips64r2 -target-feature -noabicalls -target-abi n64 -mfloat-abi hard -dwarf-column-info -debugger-tuning=gdb -v -resource-dir /usr/lib/llvm-7/lib/clang/7.0.1 -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-7/lib/clang/7.0.1/include -internal-externc-isystem /usr/include/mips64el-linux-gnuabi64 -internal-externc-isystem /include -internal-externc-isystem /usr/include -fno-dwarf-directory-asm -fdebug-compilation-dir /home/sylvestre/llvm-toolchain-8-8~+rc5 -ferror-limit 19 -fmessage-length 80 -fobjc-runtime=gcc -fdiagnostics-show-option -fcolor-diagnostics -o /tmp/foo-c7da59.s -x c foo.c
clang -cc1 version 7.0.1 based upon LLVM 7.0.1 default target mips64el-unknown-linux-gnu
ignoring nonexistent directory "/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/local/include
/usr/lib/llvm-7/lib/clang/7.0.1/include
/usr/include/mips64el-linux-gnuabi64
/usr/include
End of search list.
"/usr/bin/as" -march mips64r2 -mabi 64 -EL -KPIC -o /tmp/foo-3cb2e7.o /tmp/foo-c7da59.s
"/usr/bin/ld" --build-id --eh-frame-hdr -m elf64ltsmip -dynamic-linker /lib64/ld.so.1 -o a.out /usr/bin/../lib/gcc/mips64el-linux-gnuabi64/8/../../../mips64el-linux-gnuabi64/crt1.o /usr/bin/../lib/gcc/mips64el-linux-gnuabi64/8/../../../mips64el-linux-gnuabi64/crti.o /usr/bin/../lib/gcc/mips64el-linux-gnuabi64/8/crtbegin.o -L/usr/bin/../lib/gcc/mips64el-linux-gnuabi64/8 -L/usr/bin/../lib/gcc/mips64el-linux-gnuabi64/8/../../../mips64el-linux-gnuabi64 -L/lib/mips64el-linux-gnuabi64 -L/lib/../lib64 -L/usr/lib/mips64el-linux-gnuabi64 -L/usr/bin/../lib/gcc/mips64el-linux-gnuabi64/8 -L/usr/bin/../lib/gcc/mips64el-linux-gnuabi64/8/../../.. -L/usr/lib/llvm-7/bin/../lib -L/lib -L/usr/lib /tmp/foo-3cb2e7.o -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed /usr/bin/../lib/gcc/mips64el-linux-gnuabi64/8/crtend.o /usr/bin/../lib/gcc/mips64el-linux-gnuabi64/8/../../../mips64el-linux-gnuabi64/crtn.o

[atanasyan]

As a temporary workaround I could suggest to pass the following argument to the cmake. It might help. Anyway I'm working on a complete fix for the bug.

-DLLVM_HOST_TRIPLE=mips64el-linux-gnuabi64

[atanasyan]

I hope r357506 fixes the regression.

[sylvestre]

Thanks
Your workaround in comment #​5 fixed my issue.

Tom, I think we should take this fix in 8.0.1

[atanasyan]

Reopen the bug to make sure it will be backported to 8.0.1

[tstellar]

Merged: r358947

[tstellar]

mentioned in issue #40566