Bug#808432: gcc-6: internal compile error building mplayer pngdec.c
Package: gcc-6
Version: 6-20151211-1
Severity: normal
Dear Maintainer,
*** Reporter, please consider answering these questions, where appropriate ***
* What led up to the situation?
Attempting to build mplayer source from:
svn checkout svn://svn.mplayerhq.hu/mplayer/trunk mplayer
with ./configure --cc=gcc-6 --host-cc=gcc-6
CC libavcodec/pngdec.o
libavcodec/pngdec.c: In function 'decode_frame_common.isra.7':
libavcodec/pngdec.c:1021:43: warning: 'background_alpha' may be used uninitialized in this function [-Wmaybe-uninitialized]
uint8_t foreground_alpha, background_alpha, output_alpha;
^~~~~~~~~~~~~~~~
libavcodec/pngdec.c:1060:30: warning: 'foreground_alpha' may be used uninitialized in this function [-Wmaybe-uninitialized]
libavcodec/pngdec.c:1086:12: internal compiler error: in contains_point, at diagnostic-show-locus.c:340
static int decode_frame_common(AVCodecContext *avctx, PNGDecContext *s,
^~~~~~~~~~~~~~~~~~~
0x102bf6f contains_point
../../src/gcc/diagnostic-show-locus.c:340
0x102bf6f get_state_at_point
../../src/gcc/diagnostic-show-locus.c:684
0x102c518 print_source_line
../../src/gcc/diagnostic-show-locus.c:538
0x102c518 diagnostic_show_locus(diagnostic_context*, diagnostic_info const*)
../../src/gcc/diagnostic-show-locus.c:803
0x63e6d0 c_diagnostic_finalizer
../../src/gcc/c-family/c-opts.c:167
0x102a248 diagnostic_report_diagnostic(diagnostic_context*, diagnostic_info*)
../../src/gcc/diagnostic.c:800
0x102b2f0 warning_at(unsigned int, int, char const*, ...)
../../src/gcc/diagnostic.c:1029
0xb3cfd1 warn_uninit
../../src/gcc/tree-ssa-uninit.c:157
0xb42446 warn_uninitialized_phi
../../src/gcc/tree-ssa-uninit.c:2366
0xb42446 execute
../../src/gcc/tree-ssa-uninit.c:2459
* What exactly did you do (or not do) that was effective (or
ineffective)?
If building ffmpeg only, pngdec.c would compile fine.
If using gcc-5, pngdec.c would compile fine.
Attempted to obtain later snapshot of gcc-6 from Debian mirrors but it
was unavailable.
* What was the outcome of this action?
* What outcome did you expect instead?
*** End of the template - remove these template lines ***
-- System Information:
Debian Release: stretch/sid
APT prefers unstable
APT policy: (500, 'unstable'), (500, 'testing'), (500, 'stable'), (500, 'oldstable')
Architecture: amd64 (x86_64)
Kernel: Linux 4.4.0-rc5+ (SMP w/4 CPU cores; PREEMPT)
Locale: LANG=en_AU.UTF-8, LC_CTYPE=en_AU.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Init: sysvinit (via /sbin/init)
Versions of packages gcc-6 depends on:
ii binutils 2.25.90.20151209-1
ii cpp-6 6-20151211-1
ii gcc-6-base 6-20151211-1
ii libc6 2.21-4
ii libcc1-0 6-20151211-1
ii libgcc-6-dev 6-20151211-1
ii libgcc1 1:6-20151211-1
ii libgmp10 2:6.1.0+dfsg-2
ii libisl15 0.15-3
ii libmpc3 1.0.3-1
ii libmpfr4 3.1.3-2
ii libstdc++6 5.3.1-4
ii zlib1g 1:1.2.8.dfsg-2+b1
Versions of packages gcc-6 recommends:
ii libc6-dev 2.21-4
Versions of packages gcc-6 suggests:
pn gcc-6-doc <none>
pn gcc-6-locales <none>
pn gcc-6-multilib <none>
pn libasan3-dbg <none>
pn libatomic1-dbg <none>
pn libcilkrts5-dbg <none>
ii libgcc1-dbg 1:6-20151211-1
pn libgomp1-dbg <none>
pn libitm1-dbg <none>
pn liblsan0-dbg <none>
pn libmpx0-dbg <none>
pn libquadmath0-dbg <none>
pn libtsan0-dbg <none>
pn libubsan0-dbg <none>
-- no debconf information
-- debsums errors found:
prelink: /usr/lib/gcc/x86_64-linux-gnu/6/lto1: prelinked file was modified
debsums: changed file /usr/lib/gcc/x86_64-linux-gnu/6/lto1 (from gcc-6 package)
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