gcc: unrecognized option `-pthreads'

Joe Conway wrote:

I'm seeing "gcc: unrecognized option `-pthreads'" over and over when
building from cvs tip.

# pg_config --configure
'--prefix=/usr/local/pgsql-8.0' '--with-pgport=55435' '--with-perl'
'--with-tcl' '--with-tclconfig=/usr/lib' '--without-tk' '--with-python'
'--enable-nls' '--enable-debug' '--enable-cassert' '--enable-depend'
'--with-pam' '--enable-integer-datetimes' '--enable-thread-safety'
'--with-openssl' '--with-krb5' '--with-includes=/usr/include/kerberosIV'
'--with-includes=/usr/include/et'

# uname -a
Linux jec-linux-lt 2.6.7-1.494.2.2 #1 Tue Aug 3 09:39:58 EDT 2004 i686
i686 i386 GNU/Linux

Yep, I see that too:

gcc -O2 -fno-strict-aliasing -Wall -Wmissing-prototypes -Wmissing-declarations -O1 -Wall -Wmissing-prototypes -Wmissing-declarations -Wpointer-arith -Wcast-align -Kthread -kthread -pthread -pthreads -D_REENTRANT -D_THREAD_SAFE -D_POSIX_PTHREAD_SEMANTICS -fpic -I. -I../../../src/include -I/usr/local/include/readline -I/usr/contrib/include -I../../../src/port -DFRONTEND -c -o fe-auth.o fe-auth.c
gcc: unrecognized option `-Kthread'
gcc: unrecognized option `-kthread'
gcc: unrecognized option `-pthreads'

What is happening is that config/acx_pthread.m4 is now adding any option
that allows it to compile, so we get -pthread and -lpthread for Linux,
among other things.

The problem is that for certain flags, gcc reports the option as
unrecognized, but doesn't generate an error. I can't think of how to
check for such output from the compiler from configure.

-- 
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