Re: BUG #3728: pthread autoconf hangs

Thu, Nov 08, 2007 at 11:04:01AM +0100, Zdenek Kotala:
> heasley napsal(a):
> >The following bug has been logged online:
> >
> >Bug reference: 3728
> >Logged by: heasley
> >Email address: heas(at)shrubbery(dot)net
> >PostgreSQL version: 8.1.10
> >Operating system: sparc-sun-solaris2.9 gcc-4.1.1
> >Description: pthread autoconf hangs
> >Details:
> >
> >If the autoconf script ends-up with a CFLAGS that includes pthreads knobs,
> >for example -DREENTRANT, it will try to find pthread_join() without linking
> >in libpthread (ie: without gcc -pthread). The result is a conftest that
> >hangs because it has some half-baked stub for (among others)
> >pthread_create() that does nothing and thus it spins waiting for the
> >thread{1,2}_done variables to be set by a threads that do not exist.
> >
> >squashing the result of the first check in config/acx_pthread.m4 allows it
> >find the proper results.
> >
> >Sorry, I do not know the proper fix given all the platforms that need to
> >coexist.
>
> Please, can you provide ./configure cmd line and CFLAGS and other related
> setting? Also some error output could help. Another question is gcc 4.1 is
> not in Solaris 9. How did you install this version?

The configure is via NetBSD's pkgsrc system.

./configure --sysconfdir=/usr/pkg/etc/postgresql --datadir=/usr/pkg/share/po
stgresql --with-docdir=/usr/pkg/share/doc/postgresql --with-template=solaris --w
ithout-readline --without-zlib --enable-nls --without-java --without-perl --with
out-python --without-tcl --with-openssl --with-readline --with-zlib --enable-thr
ead-safety --with-libiconv-prefix=/usr/pkg --with-libintl-prefix=/usr/pkg --pref
ix=/usr/pkg --host=sparc-sun-solaris2 --mandir=/usr/pkg/man

from config.log:
CFLAGS=-g -static-libgcc -static-libgcc -D_LARGEFILE64_SOURCE -mcpu=v9 -mtune=ultrasparc -m64 -D__sparc_v9__ -pipe -I/usr/pkg/include -I/usr/include -Wall -Wmissing-prototypes -Wpointer-arith -Winline -Wdeclaration-after-statement -Wendif-labels -fno-strict-aliasing

www.shrubbery.net/~heas/pg_config.log.txt
www.shrubbery.net/~heas/conftest.c.txt

I built gcc 4.1, after having some difficulty with other versions. It is a
fairly straight forward build, expect that it has a hack to avoid a libiconv
bug and is within a wrapper script that forces 64-bit options. I did not have
this problem with pre-8.1.5 postgres as I recall; 8.1.4 built fine and I do
not believe there have been any pkgsrc changes that would affect this.

I did try adding an if () around the pthread_create()s, but it would seem that
they return 0. And, indeed conftest did not have libpthread linked.

yew [22] ldd conftest
libintl.so.3 => /usr/pkg/lib/libintl.so.3
libssl.so.0.9.7 => /usr/pkg/lib/libssl.so.0.9.7
libcrypto.so.0.9.7 => /usr/pkg/lib/libcrypto.so.0.9.7
libz.so.1 => /usr/pkg/lib/libz.so.1
libreadline.so.5 => /usr/pkg/lib/libreadline.so.5
librt.so.1 => /usr/lib/64/librt.so.1
libresolv.so.2 => /usr/lib/64/libresolv.so.2
libgen.so.1 => /usr/lib/64/libgen.so.1
libsocket.so.1 => /usr/lib/64/libsocket.so.1
libnsl.so.1 => /usr/lib/64/libnsl.so.1
libdl.so.1 => /usr/lib/64/libdl.so.1
libm.so.1 => /usr/lib/64/libm.so.1
libc.so.1 => /usr/lib/64/libc.so.1
libiconv.so.2 => /usr/pkg/lib/libiconv.so.2
libcurses.so.1 => /usr/lib/64/libcurses.so.1
libaio.so.1 => /usr/lib/64/libaio.so.1
libmd5.so.1 => /usr/lib/64/libmd5.so.1
libmp.so.2 => /usr/lib/64/libmp.so.2
/usr/platform/SUNW,Sun-Fire-280R/lib/sparcv9/libc_psr.so.1
/usr/platform/SUNW,Sun-Fire-280R/lib/sparcv9/libmd5_psr.so.1

indeed there are weak symbols in libc:
[2776] | 676344| 36|FUNC |WEAK |0 |9 |_pthread_create
[4109] | 676580| 40|FUNC |WEAK |0 |9 |_pthread_join
[3999] | 674772| 36|FUNC |WEAK |0 |9 |_pthread_mutex_lock