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[Runner] Adjust clang flags to make it work slightly better on Linux #405

Merged
merged 4 commits into from
Jan 23, 2025
Merged

[Runner] Adjust clang flags to make it work slightly better on Linux #405

merged 4 commits into from
Jan 23, 2025

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giordano
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@giordano giordano commented Jan 23, 2025 •
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The current order of header search paths of clang targeting platforms different than macOS and FreeBSD makes it somewhat broken:

% julia -e 'using BinaryBuilderBase; BinaryBuilderBase.runshell(Platform("aarch64", "linux"))'
sandbox:${WORKSPACE} # echo -e '#include <cstdint>\nint main(){return 0;}'|clang -x c++ - -H -o /dev/null
. /opt/aarch64-linux-gnu/aarch64-linux-gnu/include/c++/4.8.5/cstdint
.. /opt/aarch64-linux-gnu/aarch64-linux-gnu/include/c++/4.8.5/aarch64-linux-gnu/bits/c++config.h
... /opt/aarch64-linux-gnu/aarch64-linux-gnu/include/c++/4.8.5/aarch64-linux-gnu/bits/os_defines.h
.... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/features.h
..... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/stdc-predef.h
..... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/sys/cdefs.h
...... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/bits/wordsize.h
..... /opt/aarch64-linux-gnu/aarch64-linux-gnu/include/gnu/stubs.h
... /opt/aarch64-linux-gnu/aarch64-linux-gnu/include/c++/4.8.5/aarch64-linux-gnu/bits/cpu_defines.h
.. /opt/x86_64-linux-musl/bin/../include/c++/v1/stdint.h
... /opt/x86_64-linux-musl/bin/../include/c++/v1/__config
In file included from <stdin>:1:
In file included from /opt/aarch64-linux-gnu/aarch64-linux-gnu/include/c++/4.8.5/cstdint:41:
In file included from /opt/x86_64-linux-musl/bin/../include/c++/v1/stdint.h:106:
/opt/x86_64-linux-musl/bin/../include/c++/v1/__config:13:10: fatal error: '__config_site' file not found
   13 | #include <__config_site>
      |          ^~~~~~~~~~~~~~~
... /opt/x86_64-linux-musl/lib/clang/18/include/stdint.h
.... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/stdint.h
..... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/bits/wchar.h
..... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/bits/wordsize.h
1 error generated.

By moving /opt/${target}/${target}/sys-root/usr/include further up we get a more functional C++ compiler:

% julia -e 'using BinaryBuilderBase; BinaryBuilderBase.runshell(Platform("aarch64", "linux"))'
sandbox:${WORKSPACE} # echo -e '#include <cstdint>\nint main(){return 0;}'|clang -x c++ - -H -o /dev/null
. /opt/aarch64-linux-gnu/aarch64-linux-gnu/include/c++/4.8.5/cstdint
.. /opt/aarch64-linux-gnu/aarch64-linux-gnu/include/c++/4.8.5/aarch64-linux-gnu/bits/c++config.h
... /opt/aarch64-linux-gnu/aarch64-linux-gnu/include/c++/4.8.5/aarch64-linux-gnu/bits/os_defines.h
.... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/features.h
..... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/stdc-predef.h
..... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/sys/cdefs.h
...... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/bits/wordsize.h
..... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/gnu/stubs.h
...... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/bits/wordsize.h
...... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/gnu/stubs-lp64.h
... /opt/aarch64-linux-gnu/aarch64-linux-gnu/include/c++/4.8.5/aarch64-linux-gnu/bits/cpu_defines.h
.. /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/stdint.h
... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/bits/wchar.h
... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/bits/wordsize.h
sandbox:${WORKSPACE} # echo -e '#include <cmath>\nint main(){return 0;}'|clang -x c++ - -H -o /dev/null
. /opt/aarch64-linux-gnu/aarch64-linux-gnu/include/c++/4.8.5/cmath
.. /opt/aarch64-linux-gnu/aarch64-linux-gnu/include/c++/4.8.5/aarch64-linux-gnu/bits/c++config.h
... /opt/aarch64-linux-gnu/aarch64-linux-gnu/include/c++/4.8.5/aarch64-linux-gnu/bits/os_defines.h
.... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/features.h
..... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/stdc-predef.h
..... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/sys/cdefs.h
...... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/bits/wordsize.h
..... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/gnu/stubs.h
...... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/bits/wordsize.h
...... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/gnu/stubs-lp64.h
... /opt/aarch64-linux-gnu/aarch64-linux-gnu/include/c++/4.8.5/aarch64-linux-gnu/bits/cpu_defines.h
.. /opt/aarch64-linux-gnu/aarch64-linux-gnu/include/c++/4.8.5/bits/cpp_type_traits.h
.. /opt/aarch64-linux-gnu/aarch64-linux-gnu/include/c++/4.8.5/ext/type_traits.h
.. /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/math.h
... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/bits/huge_val.h
... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/bits/huge_valf.h
... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/bits/huge_vall.h
... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/bits/inf.h
... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/bits/nan.h
... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/bits/mathdef.h
... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/bits/mathcalls.h
... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/bits/mathcalls.h
... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/bits/mathcalls.h

Also, do some general cleanup.

@giordano
[Runner] Adjust clang flags to make it work slightly better on Linux
f2d5190
@giordano
[Runner] Remove completely ${sysroot}/include from headers search p…
dc169b3 
…aths for clang

Doesn't seem to be useful (it's empty for all platforms as far as I could see)
and it's in the default search path anyway:

```console
sandbox:${WORKSPACE} # /opt/x86_64-linux-musl/bin/clang -target ${target} --sysroot=/opt/${target}/${target}/sys-root -v -E -x c - < /dev/null
clang version 18.1.7 (/home/tim/.cache/BinaryBuilder/downloads/clones/llvm-project.git-1df819a03ecf6890e3787b27bfd4f160aeeeeacd50a98d003be8b0893f11a9be 768118d1ad38bf13c545828f67bd6b474d61fc55)
Target: aarch64-unknown-linux-gnu
Thread model: posix
InstalledDir: /opt/x86_64-linux-musl/bin
 (in-process)
 "/opt/x86_64-linux-musl/bin/clang-18" -cc1 -triple aarch64-unknown-linux-gnu -E -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name - -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=non-leaf -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu generic -target-feature +v8a -target-feature +fp-armv8 -target-feature +neon -target-abi aapcs -debugger-tuning=gdb -fdebug-compilation-dir=/workspace -v -fcoverage-compilation-dir=/workspace -resource-dir /opt/x86_64-linux-musl/lib/clang/18 -isysroot /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root -internal-isystem /opt/x86_64-linux-musl/lib/clang/18/include -internal-isystem /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/local/include -internal-externc-isystem /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/include -internal-externc-isystem /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include -source-date-epoch 0 -ferror-limit 19 -fno-signed-char -fgnuc-version=4.2.1 -fskip-odr-check-in-gmf -fcolor-diagnostics -target-feature +outline-atomics -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o - -x c -
clang -cc1 version 18.1.7 based upon LLVM 18.1.7 default target x86_64-alpine-linux-musl
ignoring nonexistent directory "/opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/local/include"
ignoring nonexistent directory "/opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/include"
 /opt/x86_64-linux-musl/lib/clang/18/include
 /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include
End of search list.
```
@giordano giordano mentioned this pull request Jan 23, 2025
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@giordano
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It turns out clang -x c++ does different things than clang++, the latter works fine out-of-the-box:

sandbox:${WORKSPACE} # echo -e '#include <cstdint>\nint main(){return 0;}'|clang++ -x c++ - -H -o /dev/null
. /opt/aarch64-linux-gnu/aarch64-linux-gnu/include/c++/4.8.5/cstdint
.. /opt/aarch64-linux-gnu/aarch64-linux-gnu/include/c++/4.8.5/aarch64-linux-gnu/bits/c++config.h
... /opt/aarch64-linux-gnu/aarch64-linux-gnu/include/c++/4.8.5/aarch64-linux-gnu/bits/os_defines.h
.... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/features.h
..... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/stdc-predef.h
..... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/sys/cdefs.h
...... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/bits/wordsize.h
..... /opt/aarch64-linux-gnu/aarch64-linux-gnu/include/gnu/stubs.h
... /opt/aarch64-linux-gnu/aarch64-linux-gnu/include/c++/4.8.5/aarch64-linux-gnu/bits/cpu_defines.h
.. /opt/x86_64-linux-musl/lib/clang/18/include/stdint.h
... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/stdint.h
.... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/bits/wchar.h
.... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/bits/wordsize.h
sandbox:${WORKSPACE} # echo -e '#include <cmath>\nint main(){return 0;}'|clang++ -x c++ - -H -o /dev/null
. /opt/aarch64-linux-gnu/aarch64-linux-gnu/include/c++/4.8.5/cmath
.. /opt/aarch64-linux-gnu/aarch64-linux-gnu/include/c++/4.8.5/aarch64-linux-gnu/bits/c++config.h
... /opt/aarch64-linux-gnu/aarch64-linux-gnu/include/c++/4.8.5/aarch64-linux-gnu/bits/os_defines.h
.... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/features.h
..... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/stdc-predef.h
..... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/sys/cdefs.h
...... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/bits/wordsize.h
..... /opt/aarch64-linux-gnu/aarch64-linux-gnu/include/gnu/stubs.h
... /opt/aarch64-linux-gnu/aarch64-linux-gnu/include/c++/4.8.5/aarch64-linux-gnu/bits/cpu_defines.h
.. /opt/aarch64-linux-gnu/aarch64-linux-gnu/include/c++/4.8.5/bits/cpp_type_traits.h
.. /opt/aarch64-linux-gnu/aarch64-linux-gnu/include/c++/4.8.5/ext/type_traits.h
.. /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/math.h
... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/bits/huge_val.h
... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/bits/huge_valf.h
... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/bits/huge_vall.h
... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/bits/inf.h
... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/bits/nan.h
... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/bits/mathdef.h
... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/bits/mathcalls.h
... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/bits/mathcalls.h
... /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/bits/mathcalls.h

However I believe making clang -x c++ work reliably would be worthwhile too.

@giordano
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More breadcrumbs: clang -x c++ vs clang++ -x c++: search paths are different

sandbox:${WORKSPACE} # clang -v -E -x c++ - < /dev/null 
clang version 18.1.7 (/home/tim/.cache/BinaryBuilder/downloads/clones/llvm-project.git-1df819a03ecf6890e3787b27bfd4f160aeeeeacd50a98d003be8b0893f11a9be 768118d1ad38bf13c545828f67bd6b474d61fc55)
Target: arm64-unknown-linux-gnu
Thread model: posix
InstalledDir: /opt/x86_64-linux-musl/bin
Selected GCC installation: /opt/aarch64-linux-gnu/lib/gcc/aarch64-linux-gnu/4.8.5
Candidate multilib: .;@m64
Selected multilib: .;@m64
 (in-process)
 "/opt/x86_64-linux-musl/bin/clang-18" -cc1 -triple arm64-unknown-linux-gnu -E -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name - -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=non-leaf -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu cortex-a57 -target-feature +v8a -target-feature +fp-armv8 -target-feature +neon -target-abi aapcs -debugger-tuning=gdb -fdebug-compilation-dir=/workspace -v -fcoverage-compilation-dir=/workspace -resource-dir /opt/x86_64-linux-musl/lib/clang/18 -isystem /opt/aarch64-linux-gnu/aarch64-linux-gnu/include/c++/4.8.5 -isystem /opt/aarch64-linux-gnu/aarch64-linux-gnu/include/c++/4.8.5/aarch64-linux-gnu -isystem /opt/aarch64-linux-gnu/aarch64-linux-gnu/include/c++/4.8.5/backward -isystem /opt/aarch64-linux-gnu/aarch64-linux-gnu/include -isystem /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/include -D _GLIBCXX_USE_CXX11_ABI=0 -isysroot /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root -internal-isystem /opt/x86_64-linux-musl/bin/../include/c++/v1 -internal-isystem /opt/x86_64-linux-musl/lib/clang/18/include -internal-isystem /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/local/include -internal-isystem /opt/aarch64-linux-gnu/lib/gcc/aarch64-linux-gnu/4.8.5/../../../../aarch64-linux-gnu/include -internal-externc-isystem /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/include -internal-externc-isystem /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include -source-date-epoch 0 -fdeprecated-macro -ferror-limit 19 -fno-signed-char -fgnuc-version=4.2.1 -fskip-odr-check-in-gmf -fcxx-exceptions -fexceptions -fcolor-diagnostics -target-feature +outline-atomics -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o - -x c++ -
clang -cc1 version 18.1.7 based upon LLVM 18.1.7 default target x86_64-alpine-linux-musl
ignoring nonexistent directory "/opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/include"
ignoring nonexistent directory "/opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/local/include"
ignoring nonexistent directory "/opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/include"
ignoring duplicate directory "/opt/aarch64-linux-gnu/lib/gcc/aarch64-linux-gnu/4.8.5/../../../../aarch64-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /opt/aarch64-linux-gnu/aarch64-linux-gnu/include/c++/4.8.5
 /opt/aarch64-linux-gnu/aarch64-linux-gnu/include/c++/4.8.5/aarch64-linux-gnu
 /opt/aarch64-linux-gnu/aarch64-linux-gnu/include/c++/4.8.5/backward
 /opt/aarch64-linux-gnu/aarch64-linux-gnu/include
 /opt/x86_64-linux-musl/bin/../include/c++/v1
 /opt/x86_64-linux-musl/lib/clang/18/include
 /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include
End of search list.
# 1 "<stdin>"
# 1 "<built-in>" 1
# 1 "<built-in>" 3
# 468 "<built-in>" 3
# 1 "<command line>" 1
# 1 "<built-in>" 2
# 1 "<stdin>" 2

sandbox:${WORKSPACE} # clang++ -v -E -x c++ - < /dev/null 
clang version 18.1.7 (/home/tim/.cache/BinaryBuilder/downloads/clones/llvm-project.git-1df819a03ecf6890e3787b27bfd4f160aeeeeacd50a98d003be8b0893f11a9be 768118d1ad38bf13c545828f67bd6b474d61fc55)
Target: arm64-unknown-linux-gnu
Thread model: posix
InstalledDir: /opt/x86_64-linux-musl/bin
Selected GCC installation: /opt/aarch64-linux-gnu/lib/gcc/aarch64-linux-gnu/4.8.5
Candidate multilib: .;@m64
Selected multilib: .;@m64
 (in-process)
 "/opt/x86_64-linux-musl/bin/clang-18" -cc1 -triple arm64-unknown-linux-gnu -E -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name - -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=non-leaf -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu cortex-a57 -target-feature +v8a -target-feature +fp-armv8 -target-feature +neon -target-abi aapcs -debugger-tuning=gdb -fdebug-compilation-dir=/workspace -v -fcoverage-compilation-dir=/workspace -resource-dir /opt/x86_64-linux-musl/lib/clang/18 -isystem /opt/aarch64-linux-gnu/aarch64-linux-gnu/include/c++/4.8.5 -isystem /opt/aarch64-linux-gnu/aarch64-linux-gnu/include/c++/4.8.5/aarch64-linux-gnu -isystem /opt/aarch64-linux-gnu/aarch64-linux-gnu/include/c++/4.8.5/backward -isystem /opt/aarch64-linux-gnu/aarch64-linux-gnu/include -isystem /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/include -D _GLIBCXX_USE_CXX11_ABI=0 -isysroot /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root -internal-isystem /opt/aarch64-linux-gnu/lib/gcc/aarch64-linux-gnu/4.8.5/../../../../aarch64-linux-gnu/include/c++/4.8.5 -internal-isystem /opt/aarch64-linux-gnu/lib/gcc/aarch64-linux-gnu/4.8.5/../../../../aarch64-linux-gnu/include/c++/4.8.5/aarch64-linux-gnu -internal-isystem /opt/aarch64-linux-gnu/lib/gcc/aarch64-linux-gnu/4.8.5/../../../../aarch64-linux-gnu/include/c++/4.8.5/backward -internal-isystem /opt/x86_64-linux-musl/lib/clang/18/include -internal-isystem /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/local/include -internal-isystem /opt/aarch64-linux-gnu/lib/gcc/aarch64-linux-gnu/4.8.5/../../../../aarch64-linux-gnu/include -internal-externc-isystem /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/include -internal-externc-isystem /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include -source-date-epoch 0 -fdeprecated-macro -ferror-limit 19 -fno-signed-char -fgnuc-version=4.2.1 -fskip-odr-check-in-gmf -fcxx-exceptions -fexceptions -fcolor-diagnostics -target-feature +outline-atomics -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o - -x c++ -
clang -cc1 version 18.1.7 based upon LLVM 18.1.7 default target x86_64-alpine-linux-musl
ignoring nonexistent directory "/opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/include"
ignoring nonexistent directory "/opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/local/include"
ignoring nonexistent directory "/opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/include"
ignoring duplicate directory "/opt/aarch64-linux-gnu/lib/gcc/aarch64-linux-gnu/4.8.5/../../../../aarch64-linux-gnu/include/c++/4.8.5"
ignoring duplicate directory "/opt/aarch64-linux-gnu/lib/gcc/aarch64-linux-gnu/4.8.5/../../../../aarch64-linux-gnu/include/c++/4.8.5/aarch64-linux-gnu"
ignoring duplicate directory "/opt/aarch64-linux-gnu/lib/gcc/aarch64-linux-gnu/4.8.5/../../../../aarch64-linux-gnu/include/c++/4.8.5/backward"
ignoring duplicate directory "/opt/aarch64-linux-gnu/lib/gcc/aarch64-linux-gnu/4.8.5/../../../../aarch64-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /opt/aarch64-linux-gnu/aarch64-linux-gnu/include/c++/4.8.5
 /opt/aarch64-linux-gnu/aarch64-linux-gnu/include/c++/4.8.5/aarch64-linux-gnu
 /opt/aarch64-linux-gnu/aarch64-linux-gnu/include/c++/4.8.5/backward
 /opt/aarch64-linux-gnu/aarch64-linux-gnu/include
 /opt/x86_64-linux-musl/lib/clang/18/include
 /opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include
End of search list.
# 1 "<stdin>"
# 1 "<built-in>" 1
# 1 "<built-in>" 3
# 468 "<built-in>" 3
# 1 "<command line>" 1
# 1 "<built-in>" 2
# 1 "<stdin>" 2

gcc -x c++ vs g++ -x c++: search paths are the same

sandbox:${WORKSPACE} # gcc -v -E -x c++ - < /dev/null 
Using built-in specs.
COLLECT_GCC=/opt/aarch64-linux-gnu/bin/aarch64-linux-gnu-gcc
Target: aarch64-linux-gnu
Configured with: /workspace/srcdir/gcc-4.8.5/configure --prefix=/workspace/destdir --target=aarch64-linux-gnu --host=x86_64-linux-musl --build=x86_64-linux-musl --disable-multilib --disable-werror --enable-shared --enable-host-shared --enable-threads=posix --with-sysroot=/workspace/destdir/aarch64-linux-gnu/sys-root --program-prefix=aarch64-linux-gnu- --disable-bootstrap --enable-languages=c,c++,fortran,objc,obj-c++
Thread model: posix
gcc version 4.8.5 (GCC) 
COLLECT_GCC_OPTIONS='-D' '_GLIBCXX_USE_CXX11_ABI=0' '-frandom-seed=0x2828f238' '-L/opt/aarch64-linux-gnu/aarch64-linux-gnu/lib64' '-march=armv8-a' '-mcpu=cortex-a57' '-v' '-E'
 /opt/aarch64-linux-gnu/bin/../libexec/gcc/aarch64-linux-gnu/4.8.5/cc1plus -E -quiet -v -iprefix /opt/aarch64-linux-gnu/bin/../lib/gcc/aarch64-linux-gnu/4.8.5/ -isysroot /opt/aarch64-linux-gnu/bin/../aarch64-linux-gnu/sys-root -D_GNU_SOURCE -D _GLIBCXX_USE_CXX11_ABI=0 - -march=armv8-a -mcpu=cortex-a57 -frandom-seed=0x2828f238
ignoring duplicate directory "/opt/aarch64-linux-gnu/bin/../lib/gcc/../../lib/gcc/aarch64-linux-gnu/4.8.5/../../../../aarch64-linux-gnu/include/c++/4.8.5"
ignoring duplicate directory "/opt/aarch64-linux-gnu/bin/../lib/gcc/../../lib/gcc/aarch64-linux-gnu/4.8.5/../../../../aarch64-linux-gnu/include/c++/4.8.5/aarch64-linux-gnu"
ignoring duplicate directory "/opt/aarch64-linux-gnu/bin/../lib/gcc/../../lib/gcc/aarch64-linux-gnu/4.8.5/../../../../aarch64-linux-gnu/include/c++/4.8.5/backward"
ignoring duplicate directory "/opt/aarch64-linux-gnu/bin/../lib/gcc/../../lib/gcc/aarch64-linux-gnu/4.8.5/include"
ignoring nonexistent directory "/opt/aarch64-linux-gnu/bin/../aarch64-linux-gnu/sys-root/usr/local/include"
ignoring duplicate directory "/opt/aarch64-linux-gnu/bin/../lib/gcc/../../lib/gcc/aarch64-linux-gnu/4.8.5/include-fixed"
ignoring duplicate directory "/opt/aarch64-linux-gnu/bin/../lib/gcc/../../lib/gcc/aarch64-linux-gnu/4.8.5/../../../../aarch64-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /opt/aarch64-linux-gnu/bin/../lib/gcc/aarch64-linux-gnu/4.8.5/../../../../aarch64-linux-gnu/include/c++/4.8.5
 /opt/aarch64-linux-gnu/bin/../lib/gcc/aarch64-linux-gnu/4.8.5/../../../../aarch64-linux-gnu/include/c++/4.8.5/aarch64-linux-gnu
 /opt/aarch64-linux-gnu/bin/../lib/gcc/aarch64-linux-gnu/4.8.5/../../../../aarch64-linux-gnu/include/c++/4.8.5/backward
 /opt/aarch64-linux-gnu/bin/../lib/gcc/aarch64-linux-gnu/4.8.5/include
 /opt/aarch64-linux-gnu/bin/../lib/gcc/aarch64-linux-gnu/4.8.5/include-fixed
 /opt/aarch64-linux-gnu/bin/../lib/gcc/aarch64-linux-gnu/4.8.5/../../../../aarch64-linux-gnu/include
 /opt/aarch64-linux-gnu/bin/../aarch64-linux-gnu/sys-root/usr/include
End of search list.
# 1 "<stdin>"
# 1 "<built-in>"
# 1 "<command-line>"
# 1 "/opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/stdc-predef.h" 1 3 4
# 1 "<command-line>" 2
# 1 "<stdin>"
COMPILER_PATH=/opt/aarch64-linux-gnu/bin/../libexec/gcc/aarch64-linux-gnu/4.8.5/:/opt/aarch64-linux-gnu/bin/../libexec/gcc/:/opt/aarch64-linux-gnu/bin/../lib/gcc/aarch64-linux-gnu/4.8.5/../../../../aarch64-linux-gnu/bin/
LIBRARY_PATH=/opt/aarch64-linux-gnu/bin/../lib/gcc/aarch64-linux-gnu/4.8.5/:/opt/aarch64-linux-gnu/bin/../lib/gcc/:/opt/aarch64-linux-gnu/bin/../lib/gcc/aarch64-linux-gnu/4.8.5/../../../../aarch64-linux-gnu/lib/../lib64/:/opt/aarch64-linux-gnu/bin/../aarch64-linux-gnu/sys-root/lib/../lib64/:/opt/aarch64-linux-gnu/bin/../aarch64-linux-gnu/sys-root/usr/lib/../lib64/:/opt/aarch64-linux-gnu/bin/../lib/gcc/aarch64-linux-gnu/4.8.5/../../../../aarch64-linux-gnu/lib/:/opt/aarch64-linux-gnu/bin/../aarch64-linux-gnu/sys-root/lib/:/opt/aarch64-linux-gnu/bin/../aarch64-linux-gnu/sys-root/usr/lib/
COLLECT_GCC_OPTIONS='-D' '_GLIBCXX_USE_CXX11_ABI=0' '-frandom-seed=0x2828f238' '-L/opt/aarch64-linux-gnu/aarch64-linux-gnu/lib64' '-march=armv8-a' '-mcpu=cortex-a57' '-v' '-E'
sandbox:${WORKSPACE} # g++ -v -E -x c++ - < /dev/null 
Using built-in specs.
COLLECT_GCC=/opt/aarch64-linux-gnu/bin/aarch64-linux-gnu-g++
Target: aarch64-linux-gnu
Configured with: /workspace/srcdir/gcc-4.8.5/configure --prefix=/workspace/destdir --target=aarch64-linux-gnu --host=x86_64-linux-musl --build=x86_64-linux-musl --disable-multilib --disable-werror --enable-shared --enable-host-shared --enable-threads=posix --with-sysroot=/workspace/destdir/aarch64-linux-gnu/sys-root --program-prefix=aarch64-linux-gnu- --disable-bootstrap --enable-languages=c,c++,fortran,objc,obj-c++
Thread model: posix
gcc version 4.8.5 (GCC) 
COLLECT_GCC_OPTIONS='-D' '_GLIBCXX_USE_CXX11_ABI=0' '-frandom-seed=0x2828f238' '-L/opt/aarch64-linux-gnu/aarch64-linux-gnu/lib64' '-march=armv8-a' '-mcpu=cortex-a57' '-v' '-E' '-shared-libgcc'
 /opt/aarch64-linux-gnu/bin/../libexec/gcc/aarch64-linux-gnu/4.8.5/cc1plus -E -quiet -v -iprefix /opt/aarch64-linux-gnu/bin/../lib/gcc/aarch64-linux-gnu/4.8.5/ -isysroot /opt/aarch64-linux-gnu/bin/../aarch64-linux-gnu/sys-root -D_GNU_SOURCE -D _GLIBCXX_USE_CXX11_ABI=0 - -march=armv8-a -mcpu=cortex-a57 -frandom-seed=0x2828f238
ignoring duplicate directory "/opt/aarch64-linux-gnu/bin/../lib/gcc/../../lib/gcc/aarch64-linux-gnu/4.8.5/../../../../aarch64-linux-gnu/include/c++/4.8.5"
ignoring duplicate directory "/opt/aarch64-linux-gnu/bin/../lib/gcc/../../lib/gcc/aarch64-linux-gnu/4.8.5/../../../../aarch64-linux-gnu/include/c++/4.8.5/aarch64-linux-gnu"
ignoring duplicate directory "/opt/aarch64-linux-gnu/bin/../lib/gcc/../../lib/gcc/aarch64-linux-gnu/4.8.5/../../../../aarch64-linux-gnu/include/c++/4.8.5/backward"
ignoring duplicate directory "/opt/aarch64-linux-gnu/bin/../lib/gcc/../../lib/gcc/aarch64-linux-gnu/4.8.5/include"
ignoring nonexistent directory "/opt/aarch64-linux-gnu/bin/../aarch64-linux-gnu/sys-root/usr/local/include"
ignoring duplicate directory "/opt/aarch64-linux-gnu/bin/../lib/gcc/../../lib/gcc/aarch64-linux-gnu/4.8.5/include-fixed"
ignoring duplicate directory "/opt/aarch64-linux-gnu/bin/../lib/gcc/../../lib/gcc/aarch64-linux-gnu/4.8.5/../../../../aarch64-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /opt/aarch64-linux-gnu/bin/../lib/gcc/aarch64-linux-gnu/4.8.5/../../../../aarch64-linux-gnu/include/c++/4.8.5
 /opt/aarch64-linux-gnu/bin/../lib/gcc/aarch64-linux-gnu/4.8.5/../../../../aarch64-linux-gnu/include/c++/4.8.5/aarch64-linux-gnu
 /opt/aarch64-linux-gnu/bin/../lib/gcc/aarch64-linux-gnu/4.8.5/../../../../aarch64-linux-gnu/include/c++/4.8.5/backward
 /opt/aarch64-linux-gnu/bin/../lib/gcc/aarch64-linux-gnu/4.8.5/include
 /opt/aarch64-linux-gnu/bin/../lib/gcc/aarch64-linux-gnu/4.8.5/include-fixed
 /opt/aarch64-linux-gnu/bin/../lib/gcc/aarch64-linux-gnu/4.8.5/../../../../aarch64-linux-gnu/include
 /opt/aarch64-linux-gnu/bin/../aarch64-linux-gnu/sys-root/usr/include
End of search list.
# 1 "<stdin>"
# 1 "<built-in>"
# 1 "<command-line>"
# 1 "/opt/aarch64-linux-gnu/aarch64-linux-gnu/sys-root/usr/include/stdc-predef.h" 1 3 4
# 1 "<command-line>" 2
# 1 "<stdin>"
COMPILER_PATH=/opt/aarch64-linux-gnu/bin/../libexec/gcc/aarch64-linux-gnu/4.8.5/:/opt/aarch64-linux-gnu/bin/../libexec/gcc/:/opt/aarch64-linux-gnu/bin/../lib/gcc/aarch64-linux-gnu/4.8.5/../../../../aarch64-linux-gnu/bin/
LIBRARY_PATH=/opt/aarch64-linux-gnu/bin/../lib/gcc/aarch64-linux-gnu/4.8.5/:/opt/aarch64-linux-gnu/bin/../lib/gcc/:/opt/aarch64-linux-gnu/bin/../lib/gcc/aarch64-linux-gnu/4.8.5/../../../../aarch64-linux-gnu/lib/../lib64/:/opt/aarch64-linux-gnu/bin/../aarch64-linux-gnu/sys-root/lib/../lib64/:/opt/aarch64-linux-gnu/bin/../aarch64-linux-gnu/sys-root/usr/lib/../lib64/:/opt/aarch64-linux-gnu/bin/../lib/gcc/aarch64-linux-gnu/4.8.5/../../../../aarch64-linux-gnu/lib/:/opt/aarch64-linux-gnu/bin/../aarch64-linux-gnu/sys-root/lib/:/opt/aarch64-linux-gnu/bin/../aarch64-linux-gnu/sys-root/usr/lib/
COLLECT_GCC_OPTIONS='-D' '_GLIBCXX_USE_CXX11_ABI=0' '-frandom-seed=0x2828f238' '-L/opt/aarch64-linux-gnu/aarch64-linux-gnu/lib64' '-march=armv8-a' '-mcpu=cortex-a57' '-v' '-E' '-shared-libgcc'

@giordano
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For the record, my solution to make the damned /opt/x86_64-linux-musl/bin/../include/c++/v1 directory (which is a host directory and was screwing up all the includes when picked up) go away from the search paths of clang -x c++ was to use -nostdinc++: we were already using it, but only when targeting macOS.

@giordano giordano force-pushed the mg/clang-linux branch 2 times, most recently from cd867fd to 94f8629 Compare January 23, 2025 17:33
@giordano giordano merged commit 087e705 into master Jan 23, 2025
7 checks passed
@giordano giordano deleted the mg/clang-linux branch January 23, 2025 18:26
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