http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50982
--- Comment #12 from David Edelsohn <dje at gcc dot gnu.org> 2011-11-04
14:26:58 UTC ---
Bootstrap broke with trunk revision 180821.
* include/<target>/bits/gthr-default.h should be a modified copy of
gthr-aix.h, right?
Yes, gthr-default.h is gthr-aix.h.
* What's the exact command line for the failing atomic.cc compile? In
particular, is -pthread included? That would lead to gthr-default.h
including gthr-posix.h, which again includes <pthread.h>.
Yes, this is a pthread multilib.
libtool: compile: /tmp/20111103/./gcc/xgcc -shared-libgcc
-B/tmp/20111103/./gcc
-nostdinc++ -L/tmp/20111103/powerpc-ibm-aix5.3.0.0/pthread/libstdc++-v3/src
-L/
tmp/20111103/powerpc-ibm-aix5.3.0.0/pthread/libstdc++-v3/src/.libs
-B/farm/dje/i
nstall/powerpc-ibm-aix5.3.0.0-20111103/powerpc-ibm-aix5.3.0.0/bin/
-B/farm/dje/i
nstall/powerpc-ibm-aix5.3.0.0-20111103/powerpc-ibm-aix5.3.0.0/lib/ -isystem
/far
m/dje/install/powerpc-ibm-aix5.3.0.0-20111103/powerpc-ibm-aix5.3.0.0/include
-is
ystem
/farm/dje/install/powerpc-ibm-aix5.3.0.0-20111103/powerpc-ibm-aix5.3.0.0/s
ys-include -pthread
-I/tmp/20111103/powerpc-ibm-aix5.3.0.0/pthread/libstdc++-v3/
include/powerpc-ibm-aix5.3.0.0
-I/tmp/20111103/powerpc-ibm-aix5.3.0.0/pthread/li
bstdc++-v3/include -I/farm/dje/src/src/libstdc++-v3/libsupc++
-fno-implicit-temp
lates -Wall -Wextra -Wwrite-strings -Wcast-qual
-fdiagnostics-show-location=once
-ffunction-sections -fdata-sections -frandom-seed=atomic.lo -g -O2 -pthread
-st
d=gnu++0x -c /farm/dje/src/src/libstdc++-v3/src/atomic.cc -DPIC -o
.libs/atomic
.o
* Perhaps repeat the command with -g3 -save-temps and check for a
pthread_once declaration.
AIX /usr/include/pthread.h
extern int
pthread_once __((pthread_once_t *,
void (*)(void)));
This header file is surrounded by
#ifdef __cplusplus
extern "C" {
#endif
This is why the error implies that something about the libgcc change is causing
the header file to be treated as C++ instead of extern "C".
* If I were to debug this myself, the quickest way (given enough CPU
power) is usually to have a succeeding and failing build in parallel
and compare command lines and -g3 -save-temps output.
