[Bug target/107998] [13 Regression] gcc-13-20221204 failure to build on Cygwin No dirname for option: m32

["jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107998

--- Comment #15 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to James McKelvey from comment #14)
> Okay I installed gcc-12, built about 10/29/2022:
> 
> $ g++ -v
> Using built-in specs.
> COLLECT_GCC=g++
> COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/x86_64-pc-cygwin/12.2.1/lto-
> wrapper.exe
> Target: x86_64-pc-cygwin
> Configured with: ./configure --enable-languages=c,c++ --enable-threads=posix
> Thread model: posix
> Supported LTO compression algorithms: zlib zstd
> gcc version 12.2.1 20221029 (GCC)
> 
> $ cat gcc/config/i386/t-cygwin-w64
> MULTILIB_OPTIONS = m64/m32
> MULTILIB_DIRNAMES = 64
> MULTILIB_OSDIRNAMES = ../lib ../lib32
> 
> $ gcc -print-multi-lib
> .;
> ;@m32
> 
> $ gcc -print-multi-directory
> .
> 
> $ gcc -print-multi-directory -m64
> .
> 
> $ gcc -print-multi-directory -m32
> 
> 
> $ gcc -print-multi-os-directory
> ../lib
> 
> $ gcc -print-multi-os-directory -m64
> ../lib
> 
> $ gcc -print-multi-os-directory -m32
> ../lib32

That matches what I got from a cross-compiler.
I think what is more interesting is where e.g. the libraries in the build or
installed tree are.
Say on x86_64-linux in the build directory I have
find gcc -name libgcc_s.so.\* -o -name libgcc.a
gcc/libgcc.a
gcc/32/libgcc.a
gcc/32/libgcc_s.so.1
gcc/libgcc_s.so.1
What do you get with
find gcc -name libgcc_s\*.dll -o -name libgcc.a
?