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Message-ID: <7558fc25-75a1-4cd9-ad9d-0d0b15ca6eb7@SystematicSW.ab.ca>
Date: Thu, 8 May 2025 13:59:17 -0600
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Subject: Re: Default GCC compiler options and how to change them
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To: cygwin@cygwin.com
References: <bc517274-b4b9-45ca-abec-fad52d0a41e6@hamishmb.com>
Organization: Systematic Software
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From: Brian Inglis via Cygwin <cygwin@cygwin.com>
Reply-To: cygwin@cygwin.com
Cc: Brian Inglis <Brian.Inglis@SystematicSW.ab.ca>
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On 2025-05-08 13:25, Hamish McIntyre-Bhatty via Cygwin wrote:
> I've run into a blocker when trying to build wxPython that wasn't a problem when 
> I last did it (which amittedly was over a year ago). Some -werror flags are 
> being passed to GCC, but I can't see where they're coming from. Are there any 
> defaults set for GCC that mean -werror might be turned on?
> 
> When I build wxPython on my host (Linux) system, I don't get the same issues, so 
> I'm assuming there are defaults being set somewhere. If anyone could offer some 
> help I'd be very appreciative.

Try gcc -v and gcc -###:

$ gcc -v
Using built-in specs.
COLLECT_GCC=/usr/bin/gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-pc-cygwin/12/lto-wrapper.exe
Target: x86_64-pc-cygwin
Configured with: /mnt/share/cygpkgs/gcc/gcc.x86_64/src/gcc-12.4.0/configure 
--srcdir=/mnt/share/cygpkgs/gcc/gcc.x86_64/src/gcc-12.4.0 --prefix=/usr 
--exec-prefix=/usr --localstatedir=/var --sysconfdir=/etc 
--docdir=/usr/share/doc/gcc --htmldir=/usr/share/doc/gcc/html -C 
--build=x86_64-pc-cygwin --host=x86_64-pc-cygwin --target=x86_64-pc-cygwin 
--without-libiconv-prefix --without-libintl-prefix --libexecdir=/usr/lib 
--with-gcc-major-version-only --enable-shared --enable-shared-libgcc 
--enable-static --enable-version-specific-runtime-libs --enable-bootstrap 
--enable-__cxa_atexit --enable-clocale=newlib --with-dwarf2 --with-tune=generic 
--enable-languages=ada,c,c++,fortran,lto,objc,obj-c++,jit --enable-graphite 
--enable-threads=posix --enable-libatomic --enable-libgomp --enable-libquadmath 
--enable-libquadmath-support --disable-libssp --enable-libada --disable-symvers 
--disable-multilib --with-gnu-ld --with-gnu-as 
--with-cloog-include=/usr/include/cloog-isl --without-libiconv-prefix 
--without-libintl-prefix --with-system-zlib --enable-linker-build-id 
--with-default-libstdcxx-abi=gcc4-compatible --enable-libstdcxx-filesystem-ts
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 12.4.0 (GCC)

$ gcc -###
Using built-in specs.
COLLECT_GCC=/usr/bin/gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-pc-cygwin/12/lto-wrapper.exe
Target: x86_64-pc-cygwin
Configured with: /mnt/share/cygpkgs/gcc/gcc.x86_64/src/gcc-12.4.0/configure 
--srcdir=/mnt/share/cygpkgs/gcc/gcc.x86_64/src/gcc-12.4.0 --prefix=/usr 
--exec-prefix=/usr --localstatedir=/var --sysconfdir=/etc 
--docdir=/usr/share/doc/gcc --htmldir=/usr/share/doc/gcc/html -C 
--build=x86_64-pc-cygwin --host=x86_64-pc-cygwin --target=x86_64-pc-cygwin 
--without-libiconv-prefix --without-libintl-prefix --libexecdir=/usr/lib 
--with-gcc-major-version-only --enable-shared --enable-shared-libgcc 
--enable-static --enable-version-specific-runtime-libs --enable-bootstrap 
--enable-__cxa_atexit --enable-clocale=newlib --with-dwarf2 --with-tune=generic 
--enable-languages=ada,c,c++,fortran,lto,objc,obj-c++,jit --enable-graphite 
--enable-threads=posix --enable-libatomic --enable-libgomp --enable-libquadmath 
--enable-libquadmath-support --disable-libssp --enable-libada --disable-symvers 
--disable-multilib --with-gnu-ld --with-gnu-as 
--with-cloog-include=/usr/include/cloog-isl --without-libiconv-prefix 
--without-libintl-prefix --with-system-zlib --enable-linker-build-id 
--with-default-libstdcxx-abi=gcc4-compatible --enable-libstdcxx-filesystem-ts
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 12.4.0 (GCC)

-- 
Take care. Thanks, Brian Inglis              Calgary, Alberta, Canada

La perfection est atteinte                   Perfection is achieved
non pas lorsqu'il n'y a plus rien à ajouter  not when there is no more to add
mais lorsqu'il n'y a plus rien à retrancher  but when there is no more to cut
                                 -- Antoine de Saint-Exupéry

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