[maemo-developers] Compiler bug with thread-local storage

[From: David Huggins-Daines]

Hi,

I'm not exactly sure where to report this bug, since maemo is using 
quite an old version of GCC, and I'm not sure if it is still present in 
the more recent ones.

Anyway, when compiling this code:

#include <stdio.h>

__thread FILE *logfp = (FILE *)-1;

FILE *
set_logfp(FILE *newfp)
{
    FILE *oldfp;

    if (logfp == (FILE *)-1)
        oldfp = stderr;
    else
        oldfp = logfp;
    logfp = newfp;
    return oldfp;
}

with the following options, I get this error message:

[sbox-CHINOOK_ARMEL: ~/Projects] > gcc -O2 -fPIC -c foo.c
/var/tmp/ccHiWmFT.s: Assembler messages:
/var/tmp/ccHiWmFT.s:51: Error: symbol `.L8' is already defined

I'm able to work around this bug by changing the code to this different, 
yet functionally equivalent version:

#include <stdio.h>

__thread FILE *logfp = (FILE *)-1;

FILE *
set_logfp(FILE *newfp)
{
    FILE *oldfp;

    oldfp = logfp;
    logfp = newfp;
    if (oldfp == (void *)-1)
        oldfp = stderr;
    return oldfp;
}

My GCC version is:

[sbox-CHINOOK_ARMEL: ~/Projects] > gcc -v
Reading specs from 
/scratchbox/compilers/cs2005q3.2-glibc2.5-arm/bin/../lib/gcc/arm-none-linux-gnueabi/3.4.4/specs
Reading specs from /scratchbox/compilers/cs2005q3.2-glibc2.5-arm/gcc.specs
rename spec cpp to old_cpp
Configured with: 
/home/kl/cs2005q3-2_toolchain/gcc/glibc/work/gcc-2005q3-2/configure 
--build=i386-linux --host=i386-linux --target=arm-none-linux-gnueabi 
--prefix=/scratchbox/compilers/cs2005q3.2-glibc-arm 
--with-headers=/scratchbox/compilers/cs2005q3.2-glibc-arm/usr/include 
--enable-languages=c,c++ --enable-shared --enable-threads 
--disable-checking --enable-symvers=gnu --program-prefix=arm-linux- 
--with-gnu-ld --enable-__cxa_atexit --disable-libssp 
--disable-libstdcxx-pch --with-cpu= --enable-interwork
Thread model: posix
gcc version 3.4.4 (release) (CodeSourcery ARM 2005q3-2)

If anyone could forward this or point me to the appropriate place to 
send it, I'd appreciate it, thanks!