[llvm-dev] CMakeTestCCompiler fails

[Itaru Kitayama via llvm-dev]

Mehdi,

On the supercomputer at Kyushu University, I see:
$ cat test.c
int main() {
}
$ clang -v test.c
clang version 11.0.0 (/home/usr4/c74014i/projects/llvm-project/clang
63e65082219983f1dba4faf273bad311715da14e)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/usr4/c74014i/opt/clang/current/bin
Found CUDA installation: /usr/local/cuda, version 8.0
 (in-process)
 "/home/usr4/c74014i/opt/clang/202002040908/bin/clang-11" -cc1 -triple
x86_64-unknown-linux-gnu -emit-obj -mrelax-all -disable-free
-disable-llvm-verifier -discard-value-names -main-file-name test.c
-mrelocation-model static -mthread-model posix -mframe-pointer=all
-fmath-errno -fno-rounding-math -masm-verbose -mconstructor-aliases
-munwind-tables -target-cpu x86-64 -dwarf-column-info
-fno-split-dwarf-inlining -debugger-tuning=gdb -v -resource-dir
/home/usr4/c74014i/opt/clang/202002040908/lib/clang/11.0.0
-internal-isystem /usr/local/include -internal-isystem
/home/usr4/c74014i/opt/clang/202002040908/lib/clang/11.0.0/include
-internal-externc-isystem /include -internal-externc-isystem /usr/include
-fdebug-compilation-dir /home/usr4/c74014i -ferror-limit 19
-fmessage-length 0 -fgnuc-version=4.2.1 -fobjc-runtime=gcc
-fdiagnostics-show-option -fcolor-diagnostics -faddrsig -o
/tmp/test-f00510.o -x c test.c
clang -cc1 version 11.0.0 based upon LLVM 11.0.0git default target
x86_64-unknown-linux-gnu
ignoring nonexistent directory "/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/include
 /home/usr4/c74014i/opt/clang/202002040908/lib/clang/11.0.0/include
 /usr/include
End of search list.
 "/usr/bin/ld" --hash-style=gnu --eh-frame-hdr -m elf_x86_64
-dynamic-linker /lib64/ld-linux-x86-64.so.2 -o a.out /lib/../lib64/crt1.o
/lib/../lib64/crti.o crtbegin.o -L/lib/../lib64 -L/usr/lib/../lib64
-L/home/usr4/c74014i/opt/clang/202002040908/bin/../lib -L/lib -L/usr/lib
-L/home/usr4/c74014i/opt/clang/current/lib -L. /tmp/test-f00510.o -lgcc
--as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s
--no-as-needed crtend.o /lib/../lib64/crtn.o
/usr/bin/ld: cannot find crtbegin.o: No such file or directory
/usr/bin/ld: cannot find -lgcc
/usr/bin/ld: cannot find -lgcc_s
clang-11: error: linker command failed with exit code 1 (use -v to see
invocation)

On Tue, Feb 4, 2020 at 2:07 PM Mehdi AMINI <joker.eph at gmail.com> wrote:

>
> On Mon, Feb 3, 2020 at 4:33 PM Itaru Kitayama via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
>> Trunk clang does not pass CMake C Compiler test like below:
>>
>> CMake Error at
>> /home/usr4/c74014i/opt/cmake-3.16.3-Linux-x86_64/share/cmake-3.16/Modules/CMakeTestCCompiler.cmake:60
>> (message):
>>   The C compiler
>>
>>     "/home/usr4/c74014i/opt/clang/current/bin/clang"
>>
>>   is not able to compile a simple test program.
>>
>>   It fails with the following output:
>>
>>     Change Dir:
>> /home/usr4/c74014i/work/build/202002040929/CMakeFiles/CMakeTmp
>>
>>     Run Build Command(s):/home/usr4/c74014i/opt/ninja/bin/ninja
>> cmTC_35cb3 && [1/2] Building C object
>> CMakeFiles/cmTC_35cb3.dir/testCCompiler.c.o
>>     [2/2] Linking C executable cmTC_35cb3
>>     FAILED: cmTC_35cb3
>>     : && /home/usr4/c74014i/opt/clang/current/bin/clang
>>  CMakeFiles/cmTC_35cb3.dir/testCCompiler.c.o  -o cmTC_35cb3   && :
>>     /usr/bin/ld: cannot find crtbegin.o: No such file or directory
>>     /usr/bin/ld: cannot find -lgcc
>>     /usr/bin/ld: cannot find -lgcc_s
>>     clang-11: error: linker command failed with exit code 1 (use -v to
>> see invocation)
>>     ninja: build stopped: subcommand failed.
>>
>>
>>
>>
>>
>>   CMake will not be able to correctly generate this project.
>> Call Stack (most recent call first):
>>   CMakeLists.txt:49 (project)
>>
>> My configuration is shown below:
>> cmake -G Ninja -DBUILD_SHARED_LIBS=ON -DLLVM_PARALLEL_LINK_JOBS=2
>> -DLLVM_ENABLE_LLD=ON -DLLVM_ENABLE_LIBCXX=OFF -DCMAKE_BUILD_TYPE=Release
>> -DGCC_INSTALL_PREFIX=/pathto/gcc-7.5.0/ -DLIBOMPTARGET_ENABLE_DEBUG=ON
>> -DCMAKE_INSTALL_PREFIX=$HOME/opt/clang/${today} -DCMAKE_C_COMPILER=clang
>> -DCMAKE_C_FLAGS="" -DCMAKE_CXX_COMPILER=clang++ -DCMAKE_CXX_FLAGS=""
>> -DLLVM_ENABLE_PROJECTS="clang;openmp;lld;libcxx;libcxxabi"
>> -DCLANG_OPENMP_NVPTX_DEFAULT_ARCH=sm_60
>> -DLIBOMPTARGET_NVPTX_COMPUTE_CAPABILITIES=60 -DLLVM_TARGETS_TO_BUILD=all
>> $HOME/projects/llvm-project/llvm
>>
>
> Before running cmake, are you able to compile a trivial C program by
> invoking `clang test.c` ?  (create test.c with an empty main function
> first).
>
> If not then your clang install is just not working and I'd start by
> looking into this. Running `clang -v test.c` will display a bunch of
> information about what toolchain your clang driver found and what is it
> passing to the linker invocation.
>
> --
> Mehdi
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20200204/7ead4a7e/attachment.html>