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Message-ID:	<975daff7-68f6-4aa3-902d-0de6f5dd9b3b@hamishmb.com>
Date:	Sat, 10 May 2025 20:23:19 +0100
MIME-Version:	1.0
User-Agent:	Mozilla Thunderbird
Subject:	Re: Default GCC compiler options and how to change them
To:	cygwin AT cygwin DOT com
References:	<bc517274-b4b9-45ca-abec-fad52d0a41e6 AT hamishmb DOT com>
	<7558fc25-75a1-4cd9-ad9d-0d0b15ca6eb7 AT SystematicSW DOT ab DOT ca>
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From:	Hamish McIntyre-Bhatty via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	Hamish McIntyre-Bhatty <cygwin AT hamishmb DOT com>
Errors-To:	cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com
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On 08/05/2025 20:59, Brian Inglis via Cygwin wrote:
> 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)
> 

Thanks for the reply, but that doesn't seem to be quite what I'm looking 
for, unless I missed something in the output on your Cygwin install. 
Perhaps I need to look in the spec files mentioned in the output?

Re the gold stars thing, I reckon you deserve one too, you always seem 
to be popping in with helpful answers to queries.

Best,
Hamish

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