mingw-w64 --enable-fully-dynamic-string

mingw-w64 --enable-fully-dynamic-string

[Tony Kelman]

I noticed this from openSUSE just changing this configure option in their 
mingw-w64 cross-compiler package 
(https://build.opensuse.org/package/rdiff/windows:mingw:win64/mingw64-gcc?linkrev=base&rev=73).

Checking cygwin's `x86_64-w64-mingw-g++ -v` (package version 4.9.2-1) gives 
me:

Using built-in specs.
COLLECT_GCC=x86_64-w64-mingw32-g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-w64-mingw32/4.9.2/lto-wrapper.exe
Target: x86_64-w64-mingw32
Configured with: 
/cygdrive/i/szsz/tmpp/cygwin64/mingw64-x86_64/mingw64-x86_64-gcc-4.9.2-1.x86_64/src/gcc-4.9.2/configure 
 --srcdir=/cygdrive/i/szsz/tmpp/cygwin64/mingw64-x86_64/mingw64-x86_64-gcc-4.9.2-1.x86_64/src/gcc-4.9.2 --prefix=/usr --exec-prefix=/usr --localstatedir=/var --sysconfdir=/etc --docdir=/usr/share/doc/mingw64-x86_64-gcc --htmldir=/usr/share/doc/mingw64-x86_64-gcc/html -C --build=x86_64-pc-cygwin --host=x86_64-pc-cygwin --target=x86_64-w64-mingw32 --without-libiconv-prefix --without-libintl-prefix --with-sysroot=/usr/x86_64-w64-mingw32/sys-root --with-build-sysroot=/usr/x86_64-w64-mingw32/sys-root --disable-multilib --disable-win32-registry --enable-languages=c,ada,c++,fortran,lto,objc,obj-c++ --enable-fully-dynamic-strings --enable-graphite --enable-libgomp --enable-libquadmath --enable-libquadmath-support --enable-libssp --enable-version-specific-runtime-libs --with-dwarf2 --with-gnu-ld --with-gnu-as --with-tune=generic --with-cloog-include=/usr/include/cloog-isl --with-system-zlib --libexecdir=/usr/libThread model: win32gcc version 4.9.2 (GCC)Looking at https://gcc.gnu.org/onlinedocs/libstdc++/manual/configure.html,should the --enable-fully-dynamic-strings in the Cygwin build of thispackage drop the trailing s, as opensuse just did?Thanks,Tony

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Re: mingw-w64 --enable-fully-dynamic-string

[JonY]

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On 6/14/2015 04:09, Tony Kelman wrote:
> I noticed this from openSUSE just changing this configure option in
> their mingw-w64 cross-compiler package
> (https://build.opensuse.org/package/rdiff/windows:mingw:win64/mingw64-gcc?linkrev=base&rev=73).
> 

Thanks for noticing that, Cygwin's copy contains the mistake.




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Re: mingw-w64 --enable-fully-dynamic-string

[Tony Kelman]

> Cygwin's copy contains the mistake.

Thanks for the ack. Sorry my mailer is stupid and mis-formatted the very end 
of my message.

I found the opensuse change caused an ABI breakage, C++ executables compiled 
with cygwin's mingw-w64 started segfaulting when the latest libstdc++-6.dll 
from opensuse was earlier on the path. I probably shouldn't have expected 
mixing cygwin-built mingw-w64 executables with opensuse-built mingw-w64 
libraries to work for as long as it has. If a cygwin package rebuild can 
make the ABI's compatible again that would be awesome and fix the breakage 
I've been seeing, but I probably need to switch some of my cygwin buildbots 
over to opensuse to make absolutely sure things will be compatible.

Thanks,
Tony


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Re: mingw-w64 --enable-fully-dynamic-string

[İsmail Dönmez]

Hi,

On Sun, Jun 14, 2015 at 4:08 AM, Tony Kelman <tony@kelman.net> wrote:
>> Cygwin's copy contains the mistake.
>
>
> Thanks for the ack. Sorry my mailer is stupid and mis-formatted the very end
> of my message.
>
> I found the opensuse change caused an ABI breakage, C++ executables compiled
> with cygwin's mingw-w64 started segfaulting when the latest libstdc++-6.dll
> from opensuse was earlier on the path. I probably shouldn't have expected
> mixing cygwin-built mingw-w64 executables with opensuse-built mingw-w64
> libraries to work for as long as it has. If a cygwin package rebuild can
> make the ABI's compatible again that would be awesome and fix the breakage
> I've been seeing, but I probably need to switch some of my cygwin buildbots
> over to opensuse to make absolutely sure things will be compatible.

I submitted this change in openSUSE and the mingw packages were
rebuilt as a result, so on openSUSE side everything works as expected.
I also checked msys2 and they use the correct configure line so they
use the same ABI as openSUSE.

It would be nice to have this fixed in Cygwin and get all mingw
packages rebuilt as a result.

ismail

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Re: mingw-w64 --enable-fully-dynamic-string

[Tony Kelman]

> If a cygwin package rebuild can make the ABI's compatible again
> that would be awesome and fix the breakage I've been seeing

Thanks JonY for the 4.9.2-2 rebuild. Everything looks to be playing well 
together again on my end. (I should still investigate some future-proofing 
of my setup but it's not so urgent for now.)

-Tony


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