--- Begin Message ---
Package: gcc-4.8
Version: 4.8.2-12
Severity: important
webkitgtk 2.3.4 FTBFS with the latest gcc-4.8:
../Source/WTF/wtf/Atomics.h: Assembler messages:
../Source/WTF/wtf/Atomics.h:300: Error: bad register name `%sil'
[...]
You can see the full log here:
https://buildd.debian.org/status/fetch.php?pkg=webkitgtk&arch=i386&ver=2.3.4-1&stamp=1389693794
My understanding is that gcc is incorrectly producing x86-64 registers
when generating x86 code.
I managed to narrow it down with a pre-processed version of the
CodeBlock.cpp source file from webkit (I can attach it or post it
somewhere, it's ~400KB of compressed code):
$ gcc -O1 -m32 --std=c++11 -c CodeBlock.ii
../Source/WTF/wtf/Atomics.h: Assembler messages:
../Source/WTF/wtf/Atomics.h:300: Error: bad register name `%bpl'
../Source/WTF/wtf/Atomics.h:300: Error: bad register name `%bpl'
../Source/WTF/wtf/Atomics.h:300: Error: bad register name `%dil'
This works fine, though (which I don't quite understand since
-frename-registers should already be enabled by -O1):
$ gcc -O1 -m32 --std=c++11 -c -frename-registers CodeBlock.ii
Here's the relevant part of the source file:
inline bool weakCompareAndSwap(uint8_t* location, uint8_t expected, uint8_t newValue)
{
unsigned char result;
asm volatile(
"lock; cmpxchgb %3, %2\n\t"
"sete %1"
: "+a"(expected), "=q"(result), "+m"(*location)
: "r"(newValue)
: "memory"
);
return result;
}
This upstream GCC bug is related:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=10153
Although the suggestion to use '=r' instead of '=q' doesn't seem to
solve the problem.
Berto
-- System Information:
Debian Release: jessie/sid
APT prefers testing
APT policy: (500, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386
Kernel: Linux 3.12-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.utf8, LC_CTYPE=en_US.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages gcc-4.8 depends on:
ii binutils 2.24-2
ii cpp-4.8 4.8.2-12
ii gcc-4.8-base 4.8.2-12
ii libc6 2.17-97
ii libcloog-isl4 0.18.1-3
ii libgcc-4.8-dev 4.8.2-12
ii libgmp10 2:5.1.3+dfsg-1
ii libisl10 0.12.1-2
ii libmpc3 1.0.1-1
ii libmpfr4 3.1.2-1
ii zlib1g 1:1.2.8.dfsg-1
Versions of packages gcc-4.8 recommends:
ii libc6-dev 2.17-97
Versions of packages gcc-4.8 suggests:
ii binutils [binutils-gold] 2.24-2
ii gcc-4.8-doc 4.8.2-2
pn gcc-4.8-locales <none>
pn gcc-4.8-multilib <none>
pn libasan0-dbg <none>
pn libatomic1-dbg <none>
pn libbacktrace1-dbg <none>
pn libgcc1-dbg <none>
pn libgomp1-dbg <none>
pn libitm1-dbg <none>
pn libquadmath0-dbg <none>
pn libtsan0-dbg <none>
-- no debconf information
--- End Message ---