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pthreads.h
- To: egcs at cygnus dot com, tot at trema dot com
- Subject: pthreads.h
- From: mrs at wrs dot com (Mike Stump)
- Date: Fri, 30 Jan 1998 11:19:17 -0800
One cannot use autoconf to determine characteristics of the target
system with code like:
# Check for thread headers.
AC_CHECK_HEADER(thread.h, [have_thread_h=yes], [have_thread_h=])
AC_CHECK_HEADER(pthread.h, [have_pthread_h=yes], [have_pthread_h=])
sparc-*-solaris2*)
tm_file=sparc/sol2.h
xm_file=sparc/xm-sol2.h
tmake_file=sparc/t-sol2
xmake_file=sparc/x-sysv4
extra_parts="crt1.o crti.o crtn.o gcrt1.o gmon.o crtbegin.o crtend.o"
fixincludes=fixinc.svr4
float_format=i128
broken_install=yes
if [[ x${enable_threads} = x ]]; then
enable_threads=$have_pthread_h
if [[ x${enable_threads} = x ]]; then
enable_threads=$have_thread_h
fi
fi
if [[ x${enable_threads} = xyes ]]; then
if [[ x${have_pthread_h} = xyes ]]; then
thread_file='posix'
else
thread_file='solaris'
fi
fi
unless one is doing a native build. For a cross compile, you can
autoconf using the cross compiler, but you need one before you can
build one, so you default to not having threads, build up the
compiler, then figure out that you have threads, and then recompile
the compiler... :-)
Maybe we need an autoconf macro that can just check for the existence
of a file in a list of directories. You could then use that directly,
before compiler build.
Another solution, is to just assume that a header is available. For
example, if all solaris machines have a working thread.h file, then
just always enable threads and expect that file.