clang default include directories cygwin

[donaldysmith]

Description / Steps to reproduce the issue

Install the newest msys2, then
pacman -Suy
pacman -S clang

$ clang++ -v -c -xc++ /dev/null

clang version 11.0.0 (https://github.com/msys2/MSYS2-packages 9ef552a)

Target: x86_64-pc-windows-msys

Thread model: posix

InstalledDir: /usr/bin

(in-process)

"/usr/bin/clang++" -cc1 -triple x86_64-pc-windows-msys -emit-obj -mrelax-all -disable-free -disable-llvm-verifier -discard-value-names -main-file-name null -mrelocation-model pic -pic-level 2 -mframe-pointer=none -fmath-errno -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -debugger-tuning=gdb -v -resource-dir /usr/lib/clang/11.0.0 -fdeprecated-macro -fdebug-compilation-dir /home/Q11161 -ferror-limit 19 -fno-use-cxa-atexit -fgnuc-version=4.2.1 -fcxx-exceptions -fexceptions -fcolor-diagnostics -faddrsig -o null.o -x c++ /dev/null

clang -cc1 version 11.0.0 based upon LLVM 11.0.0 default target x86_64-pc-msys

ignoring nonexistent directory "/usr/lib/gcc/i686-pc-cygwin/4.7.3/include/c++"

ignoring nonexistent directory "/usr/lib/gcc/i686-pc-cygwin/4.7.3/include/c++/i686-pc-cygwin"

ignoring nonexistent directory "/usr/lib/gcc/i686-pc-cygwin/4.7.3/include/c++/backward"

ignoring nonexistent directory "/usr/lib/gcc/i686-pc-cygwin/4.5.3/include/c++"

ignoring nonexistent directory "/usr/lib/gcc/i686-pc-cygwin/4.5.3/include/c++/i686-pc-cygwin"

ignoring nonexistent directory "/usr/lib/gcc/i686-pc-cygwin/4.5.3/include/c++/backward"

ignoring nonexistent directory "/usr/lib/gcc/i686-pc-cygwin/4.3.4/include/c++"

ignoring nonexistent directory "/usr/lib/gcc/i686-pc-cygwin/4.3.4/include/c++/i686-pc-cygwin"

ignoring nonexistent directory "/usr/lib/gcc/i686-pc-cygwin/4.3.4/include/c++/backward"

ignoring nonexistent directory "/usr/lib/gcc/i686-pc-cygwin/4.3.2/include/c++"

ignoring nonexistent directory "/usr/lib/gcc/i686-pc-cygwin/4.3.2/include/c++/i686-pc-cygwin"

ignoring nonexistent directory "/usr/lib/gcc/i686-pc-cygwin/4.3.2/include/c++/backward"

ignoring nonexistent directory "/usr/local/include"

#include "..." search starts here:

#include <...> search starts here:

/usr/lib/clang/11.0.0/include

/usr/include/w32api

/usr/include

End of search list.

Expected behavior

clang++ should compile 'hello, world' c++ code.

Actual behavior

It failed because the included directories were set to /usr/lib/gcc/i686-pc-cygwin/4.7.3/ instead of /usr/lib/gcc/x86_64-pc-msys/13.3.0/

Verification

• I have verified that my MSYS2 is up-to-date before submitting the report (see https://www.msys2.org/docs/updating/)

Windows Version

MSYS_NT-10.0-19045 ARCC307637 3.5.4-0bc1222b.x86_64 2024-09-04 18:28 UTC x86_64 Msys

Are you willing to submit a PR?

No response