[FFmpeg-devel] FATE failure on mingw gcc-4.2.4

[Frank Barchard]

On Thu, Mar 11, 2010 at 1:43 AM, Ramiro Polla <ramiro.polla at gmail.com>wrote:

> On Thu, Mar 11, 2010 at 6:26 AM, Ramiro Polla <ramiro.polla at gmail.com>
> wrote:
> > On Thu, Mar 11, 2010 at 6:24 AM, Frank Barchard <fbarchard at google.com>
> wrote:
> >> On Mon, Mar 8, 2010 at 8:02 PM, M?ns Rullg?rd <mans at mansr.com> wrote:
> >>
> >>> The build failures on mingw with gcc 4.2.4 are caused by the recent
> >>> addition of -Werror=missing-prototypes triggering an error in
> >>> stdio.h.  For some reason, this gcc version isn't treating this as a
> >>> system header and suppressing warnings.
> >>>
> >>> It might be possible to work around this by providing an explicit
> >>> --sysroot argument to ffmpeg's configure.  Could someone with an
> >>> affected system please try this?
> >>>
> >>
> >> This is affecting chromium, which uses:
> >> gcc-sjlj.exe (GCC) 4.2.1-sjlj (mingw32-2)
> >> a sampling of errors:
> >>
> c:\msys\1.0\bin\../lib/gcc/mingw32/4.2.1-sjlj/../../../../include/inttypes.h:259:
> >> error: no previous prototype for 'imaxabs'
> >>
> c:\msys\1.0\bin\../lib/gcc/mingw32/4.2.1-sjlj/../../../../include/math.h:357:
> >> error: no previous prototype for '__fpclassifyl'
> >>
> c:\msys\1.0\bin\../lib/gcc/mingw32/4.2.1-sjlj/../../../../include/stdio.h:372:
> >> error: no previous prototype for 'getc'
> >>
> >> updating to 4.4, it builds.  But it doesn't run?
> >
> > FATE and the autobuilds seem happy about 4.4.2. What version of
> > binutils and mingw-runtime are you using?
>
> Oh, are you using 4.4.0 from mingw.org? I've never gotten it to work,
> it's full of bugs. It's better if you build your own (or get it from
> some place like http://www.tdragon.net/recentgcc/ or
> http://komisar.gin.by/mingw/index.html ).
>

Ramiro,
thanks for the links and quick response.

yes, I used 4.4 from mingw.org
details are here
svn://chrome-svn/chrome/trunk/deps/third_party/mingw/README.chromium
which says

binutils-2.17.50-20060824-1.tar.gz
coreutils-5.97-MSYS-1.0.11-snapshot.tar.bz2
gcc-core-4.2.1-sjlj-2.tar.gz
mingwrt-3.15.2-mingw32-dev.tar.gz
w32api-3.13-mingw32-dev.tar.gz

These are only used for ffmpeg, and being open source, contributions
are welcome.
I'm not keen to take on more complicated config setup.

I know there is technical merit to 4.4, but at the moment, ffmpeg does not
build with any officially released compilers?
I would like to upgrade.  But my inclination remains to patch ffmpeg to work
with 4.2 until the next official gcc is made to work.