running clang via `ld-linux-x86-64.so.2 clang test.c` is't work

[leleliu008]

run clang as /home/leleliu008/Downloads/glibc/lib/ld-linux-x86-64.so.2 ./clang -v -c test.c

I got following:

clang version 18.1.8
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/leleliu008/Downloads/llvm+clang-18.1.8-linux-glibc-x86_64.release.old/bin/.
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/13
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/13
Candidate multilib: .;@m64
Selected multilib: .;@m64
 (in-process)
 "/home/leleliu008/Downloads/glibc/lib/ld-linux-x86-64.so.2" -cc1 -triple x86_64-unknown-linux-gnu -emit-obj -mrelax-all -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name test.c -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=all -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fdebug-compilation-dir=/home/leleliu008/Downloads/llvm+clang-18.1.8-linux-glibc-x86_64.release.old/bin -v -fcoverage-compilation-dir=/home/leleliu008/Downloads/llvm+clang-18.1.8-linux-glibc-x86_64.release.old/bin -resource-dir /home/leleliu008/Downloads/llvm+clang+lld-18.1.8-linux-glibc-x86_64.release/lib/clang/18 -internal-isystem /home/leleliu008/Downloads/llvm+clang+lld-18.1.8-linux-glibc-x86_64.release/lib/clang/18/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/13/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -ferror-limit 19 -fgnuc-version=4.2.1 -fskip-odr-check-in-gmf -fcolor-diagnostics -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o test.o -x c test.c
clang -cc1 version 18.1.8 based upon LLVM 18.1.8 default target x86_64-unknown-linux-gnu
ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/13/../../../../x86_64-linux-gnu/include"
ignoring nonexistent directory "/include"
#include "..." search starts here:
#include <...> search starts here:
 /home/leleliu008/Downloads/llvm+clang+lld-18.1.8-linux-glibc-x86_64.release/lib/clang/18/include
 /usr/local/include
 /usr/include/x86_64-linux-gnu
 /usr/include
End of search list.

As you can see, cc1 is invoked via /home/leleliu008/Downloads/glibc/lib/ld-linux-x86-64.so.2" -cc1

I guess clang use /proc/self/exe to determine self path on GNU/Linux.

Why I use this way to run clang?

Becase this is the most portable way to run dynamically linked executables on all GNU/Linux.

[llvmbot]

@llvm/issue-subscribers-clang-driver

Author: None (leleliu008)

run clang as `/home/leleliu008/Downloads/glibc/lib/ld-linux-x86-64.so.2 ./clang -v -c test.c`

I got following:

clang version 18.1.8
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/leleliu008/Downloads/llvm+clang-18.1.8-linux-glibc-x86_64.release.old/bin/.
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/13
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/13
Candidate multilib: .;@<!-- -->m64
Selected multilib: .;@<!-- -->m64
 (in-process)
 "/home/leleliu008/Downloads/glibc/lib/ld-linux-x86-64.so.2" -cc1 -triple x86_64-unknown-linux-gnu -emit-obj -mrelax-all -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name test.c -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=all -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fdebug-compilation-dir=/home/leleliu008/Downloads/llvm+clang-18.1.8-linux-glibc-x86_64.release.old/bin -v -fcoverage-compilation-dir=/home/leleliu008/Downloads/llvm+clang-18.1.8-linux-glibc-x86_64.release.old/bin -resource-dir /home/leleliu008/Downloads/llvm+clang+lld-18.1.8-linux-glibc-x86_64.release/lib/clang/18 -internal-isystem /home/leleliu008/Downloads/llvm+clang+lld-18.1.8-linux-glibc-x86_64.release/lib/clang/18/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/13/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -ferror-limit 19 -fgnuc-version=4.2.1 -fskip-odr-check-in-gmf -fcolor-diagnostics -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o test.o -x c test.c
clang -cc1 version 18.1.8 based upon LLVM 18.1.8 default target x86_64-unknown-linux-gnu
ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/13/../../../../x86_64-linux-gnu/include"
ignoring nonexistent directory "/include"
#include "..." search starts here:
#include &lt;...&gt; search starts here:
 /home/leleliu008/Downloads/llvm+clang+lld-18.1.8-linux-glibc-x86_64.release/lib/clang/18/include
 /usr/local/include
 /usr/include/x86_64-linux-gnu
 /usr/include
End of search list.

As you can see, cc1 is invoked via /home/leleliu008/Downloads/glibc/lib/ld-linux-x86-64.so.2" -cc1

I guess clang use /proc/self/exe to determine self path on GNU/Linux.

Why I use this way to run clang?

Becase this is the most portable way to run dynamically linked executables on all GNU/Linux.

[frederick-vs-ja]

Have you tried Clang 20 or trunk?

[leleliu008]

Have you tried Clang 20 or trunk?

No, I will try it.

[leleliu008]

I tried https://github.com/llvm/llvm-project/releases/download/llvmorg-20.1.8/llvm-project-20.1.8.src.tar.xz

It doesn't work, either.

clang version 20.1.8
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/leleliu008/Downloads/llvm+clang-20.1.8-linux-glibc-x86_64.release/.ppkg/dependencies/lib
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/13
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/13
Candidate multilib: .;@m64
Selected multilib: .;@m64
 (in-process)
 "/home/leleliu008/Downloads/glibc/lib/ld-linux-x86-64.so.2" -cc1 -triple x86_64-unknown-linux-gnu -emit-obj -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name test.c -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=all -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fdebug-compilation-dir=/home/leleliu008/Downloads/llvm+clang-20.1.8-linux-glibc-x86_64.release -v -fcoverage-compilation-dir=/home/leleliu008/Downloads/llvm+clang-20.1.8-linux-glibc-x86_64.release -resource-dir /home/leleliu008/Downloads/llvm+clang-20.1.8-linux-glibc-x86_64.release/.ppkg/dependencies/lib/clang/20 -internal-isystem /home/leleliu008/Downloads/llvm+clang-20.1.8-linux-glibc-x86_64.release/.ppkg/dependencies/lib/clang/20/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/13/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -ferror-limit 19 -fgnuc-version=4.2.1 -fskip-odr-check-in-gmf -fcolor-diagnostics -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o test.o -x c test.c
clang -cc1 version 20.1.8 based upon LLVM 20.1.8 default target x86_64-unknown-linux-gnu
ignoring nonexistent directory "/home/leleliu008/Downloads/llvm+clang-20.1.8-linux-glibc-x86_64.release/.ppkg/dependencies/lib/clang/20/include"
ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/13/../../../../x86_64-linux-gnu/include"
ignoring nonexistent directory "/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/include
 /usr/include/x86_64-linux-gnu
 /usr/include
End of search list.

[tru]

Does it actually give you an error? Afaik cc1 is called in-process by default these days. I would suspect it's only the log message that's wrong unless you actually get an error. Try compiling a file with -### to see what's really invoked.

[tru]

Oh the log actually says in-process. So I think this is only a problem with the log row.

[leleliu008]

/home/leleliu008/Downloads/glibc/lib/ld-linux-x86-64.so.2 bin/clang-20 test.c

report:

-cc1: error while loading shared libraries: -cc1: cannot open shared object file
clang-20: error: unable to execute command: No such file or directory
clang-20: error: clang frontend command failed due to signal (use -v to see invocation)
clang version 20.1.8
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/leleliu008/Downloads/llvm+clang-20.1.8-linux-glibc-x86_64.release/.ppkg/dependencies/lib
clang-20: error: unable to execute command: No such file or directory
clang-20: note: diagnostic msg: Error generating preprocessed source(s).

/home/leleliu008/Downloads/glibc/lib/ld-linux-x86-64.so.2 bin/clang-20 -### test.c

report:

clang version 20.1.8
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/leleliu008/Downloads/llvm+clang-20.1.8-linux-glibc-x86_64.release/.ppkg/dependencies/lib
 "/home/leleliu008/Downloads/glibc/lib/ld-linux-x86-64.so.2" "-cc1" "-triple" "x86_64-unknown-linux-gnu" "-emit-obj" "-dumpdir" "a-" "-disable-free" "-clear-ast-before-backend" "-disable-llvm-verifier" "-discard-value-names" "-main-file-name" "test.c" "-mrelocation-model" "pic" "-pic-level" "2" "-pic-is-pie" "-mframe-pointer=all" "-fmath-errno" "-ffp-contract=on" "-fno-rounding-math" "-mconstructor-aliases" "-funwind-tables=2" "-target-cpu" "x86-64" "-tune-cpu" "generic" "-debugger-tuning=gdb" "-fdebug-compilation-dir=/home/leleliu008/Downloads/llvm+clang-20.1.8-linux-glibc-x86_64.release" "-fcoverage-compilation-dir=/home/leleliu008/Downloads/llvm+clang-20.1.8-linux-glibc-x86_64.release" "-resource-dir" "/home/leleliu008/Downloads/llvm+clang-20.1.8-linux-glibc-x86_64.release/.ppkg/dependencies/lib/clang/20" "-internal-isystem" "/home/leleliu008/Downloads/llvm+clang-20.1.8-linux-glibc-x86_64.release/.ppkg/dependencies/lib/clang/20/include" "-internal-isystem" "/usr/local/include" "-internal-isystem" "/usr/lib/gcc/x86_64-linux-gnu/13/../../../../x86_64-linux-gnu/include" "-internal-externc-isystem" "/usr/include/x86_64-linux-gnu" "-internal-externc-isystem" "/include" "-internal-externc-isystem" "/usr/include" "-ferror-limit" "19" "-fgnuc-version=4.2.1" "-fskip-odr-check-in-gmf" "-fcolor-diagnostics" "-faddrsig" "-D__GCC_HAVE_DWARF2_CFI_ASM=1" "-o" "/tmp/test-d07158.o" "-x" "c" "test.c"
 "/usr/bin/ld" "--hash-style=gnu" "--eh-frame-hdr" "-m" "elf_x86_64" "-pie" "-dynamic-linker" "/lib64/ld-linux-x86-64.so.2" "-o" "a.out" "/lib/x86_64-linux-gnu/Scrt1.o" "/lib/x86_64-linux-gnu/crti.o" "/usr/lib/gcc/x86_64-linux-gnu/13/crtbeginS.o" "-L/usr/lib/gcc/x86_64-linux-gnu/13" "-L/usr/lib/gcc/x86_64-linux-gnu/13/../../../../lib64" "-L/lib/x86_64-linux-gnu" "-L/lib/../lib64" "-L/usr/lib/x86_64-linux-gnu" "-L/usr/lib/../lib64" "-L/lib" "-L/usr/lib" "/tmp/test-d07158.o" "-lgcc" "--as-needed" "-lgcc_s" "--no-as-needed" "-lc" "-lgcc" "--as-needed" "-lgcc_s" "--no-as-needed" "/usr/lib/gcc/x86_64-linux-gnu/13/crtendS.o" "/lib/x86_64-linux-gnu/crtn.o"

[tru]

Try adding -fintegrated-cc1

[leleliu008]

Try adding -fintegrated-cc1

same result