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Re: Bug#804002: libxcb FTBFS on mips: cc1 segfaults building xkb.c

Version: 5.3.1-4

On 2015-11-11 22:13, Aurelien Jarno wrote:
> control: reassign -1 gcc-5
> control: affects -1 libxcb
> control: forwarded -1 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68302
> On 2015-11-06 07:52, Helmut Grohne wrote:
> > On Wed, Nov 04, 2015 at 06:26:01AM +0100, Helmut Grohne wrote:
> > > | libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I../../src -D_FORTIFY_SOURCE=2 -Wall -Wpointer-arith -Wmissing-declarations -Wformat=2 -Wstrict-prototypes -Wmissing-prototypes -Wnested-externs -Wbad-function-cast -Wold-style-definition -Wdeclaration-after-statement -Wunused -Wuninitialized -Wshadow -Wmissing-noreturn -Wmissing-format-attribute -Wredundant-decls -Wlogical-op -Werror=implicit -Werror=nonnull -Werror=init-self -Werror=main -Werror=missing-braces -Werror=sequence-point -Werror=return-type -Werror=trigraphs -Werror=array-bounds -Werror=write-strings -Werror=address -Werror=int-to-pointer-cast -Werror=pointer-to-int-cast -g -O2 -fstack-protector-strong -Wformat -Werror=format-security -c xkb.c -o xkb.o
> > > | gcc: internal compiler error: Segmentation fault (program cc1)
> > > | Please submit a full bug report,
> > > | with preprocessed source if appropriate.
> > > | See <file:///usr/share/doc/gcc-5/README.Bugs> for instructions.
> > > | Makefile:996: recipe for target 'xkb.lo' failed
> > > 
> > > The attached file xkb.pre.c is the result of running the same invocation
> > > past the preprocessor. Running gcc -g -O2 xkb.pre.c also gives that
> > > segfault. Dropping either -g or -O2 or using -O1 or -O3 makes it go
> > > away. Thus I cc debian-gcc@l.d.o. This is gcc-5 5.2.1-23.
> > 
> > I am attaching a reduced file crash.c that reproduces the crash with
> > just 28 lines and no includes. It seems that the bug is in the code
> > generator or optimizer, because we can only observe a crash for mips and
> > subtle changes make the issue disappear. Judging from a quick glance at
> > a traceback (w/o debug symbols), the issue at hand is a stack space
> > exhaustion of two mutually recursive functions. That's all I know for
> > now.
> Thanks for the reduced testcase. The problem is reproducible with gcc
> trunk from today on both mips and mipsel. One need to add
> -march=mips32r2 to reproduce the issue on mipsel as it is not (yet)
> the default there.
> I have reported the bug upstream, and I am re-affecting this bug to
> gcc-5 as the bug is actually there.

It happens the bug has already been reported upstream as PR67355 and has
been fixed recently. On the Debian side, it has been fixed in version
5.3.1-4. This has been confirmed by the successful build of libxcb [1].
I am therefore closing the bug.

[1] https://buildd.debian.org/status/fetch.php?pkg=libxcb&arch=mips&ver=1.11.1-1&stamp=1446060666

Aurelien Jarno                          GPG: 4096R/1DDD8C9B
aurelien@aurel32.net                 http://www.aurel32.net

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