On Sun, Nov 20, 2016 at 1:07 AM, Andreas Cadhalpun <andreas.cadhal...@googlemail.com> wrote: > gcc before gcc-5 reserves a register on x86_32 for the GOT, when PIE is > enabled. > > This fixes build failures due to: > error: 'asm' operand has impossible constraints > > Signed-off-by: Andreas Cadhalpun <andreas.cadhal...@googlemail.com> > --- > > A build log of a failed build with gcc 4.9 is available at: > https://buildd.debian.org/status/fetch.php?pkg=ffmpeg&arch=i386&ver=7%3A3.2-2~bpo8%2B1&stamp=1478791165 > > --- > configure | 13 +++++++++++++ > 1 file changed, 13 insertions(+) > > diff --git a/configure b/configure > index b5bfad6..8794580 100755 > --- a/configure > +++ b/configure > @@ -5364,6 +5364,19 @@ EOF > enabled ssse3 && check_inline_asm ssse3_inline '"pabsw %xmm0, %xmm0"' > enabled mmxext && check_inline_asm mmxext_inline '"pmaxub %mm0, %mm1"' > > + case "$toolchain" in > + hardened) > + if enabled x86_32; then > + # When PIE is enabled on x86_32, gcc before gcc-5 reserves a > register for the GOT. > + case $gcc_basever in > + 2*|3*|4*) > + disable ebp_available > + ;; > + esac > + fi > + ;; > + esac
Can't we build a test to detect this instead of hard-coding some constraints? - Hendrik _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
