-# threadlib.m4 serial 13
+# threadlib.m4 serial 14
dnl Copyright (C) 2005-2018 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
*" -static "*) gl_cv_have_weak=no ;;
esac
])
+ dnl Check whether the linker supports the --as-needed/--no-as-needed options.
+ dnl Assume GCC, so that we can use the -Wl option.
+ AC_CACHE_CHECK([whether the linker supports --as-needed],
+ [gl_cv_linker_have_as_needed],
+ [if test -n "$GCC"; then
+ gl_saved_ldflags="$LDFLAGS"
+ LDFLAGS="$gl_saved_ldflags -Wl,--as-needed -Wl,--no-as-needed"
+ AC_LINK_IFELSE([AC_LANG_PROGRAM()],
+ [gl_cv_linker_have_as_needed=yes],
+ [gl_cv_linker_have_as_needed=no])
+ LDFLAGS="$gl_saved_ldflags"
+ else
+ gl_cv_linker_have_as_needed=no
+ fi
+ ])
+ dnl Check whether the linker supports the --push-state/--pop-state options.
+ dnl Assume GCC, so that we can use the -Wl option.
+ AC_CACHE_CHECK([whether the linker supports --push-state],
+ [gl_cv_linker_have_push_state],
+ [if test -n "$GCC"; then
+ gl_saved_ldflags="$LDFLAGS"
+ LDFLAGS="$gl_saved_ldflags -Wl,--push-state -Wl,--pop-state"
+ AC_LINK_IFELSE([AC_LANG_PROGRAM()],
+ [gl_cv_linker_have_push_state=yes],
+ [gl_cv_linker_have_push_state=no])
+ LDFLAGS="$gl_saved_ldflags"
+ else
+ gl_cv_linker_have_push_state=no
+ fi
+ ])
if test "$gl_use_threads" = yes || test "$gl_use_threads" = posix; then
# On OSF/1, the compiler needs the flag -pthread or -D_REENTRANT so that
# it groks <pthread.h>. It's added above, in gl_THREADLIB_EARLY_BODY.
[Define if references to the POSIX multithreading library should be made weak.])
LIBTHREAD=
LTLIBTHREAD=
+ dnl On platforms where GCC enables --as-needed by default, attempt
+ dnl to make sure that LIBMULTITHREAD really links with -lpthread.
+ dnl Otherwise linking with LIBMULTITHREAD has no effect; then
+ dnl the weak symbols are not defined and thus evaluate to NULL.
+ case "$LIBMULTITHREAD" in
+ "") ;;
+ -pthread)
+ if test $gl_cv_linker_have_as_needed = yes; then
+ if test $gl_cv_linker_have_push_state = yes; then
+ LIBMULTITHREAD="$LIBMULTITHREAD -Wl,--push-state -Wl,--no-as-needed -lpthread -Wl,--pop-state"
+ else
+ LIBMULTITHREAD="$LIBMULTITHREAD -Wl,--no-as-needed -lpthread"
+ fi
+ fi
+ ;;
+ *)
+ if test $gl_cv_linker_have_as_needed = yes; then
+ if test $gl_cv_linker_have_push_state = yes; then
+ LIBMULTITHREAD="-Wl,--push-state -Wl,--no-as-needed $LIBMULTITHREAD -Wl,--pop-state"
+ else
+ LIBMULTITHREAD="-Wl,--no-as-needed $LIBMULTITHREAD"
+ fi
+ fi
+ ;;
+ esac
+ # TODO: May need to modify LTLIBMULTITHREAD similarly.
fi
fi
fi
[Define if references to the old Solaris multithreading library should be made weak.])
LIBTHREAD=
LTLIBTHREAD=
+ dnl On platforms where GCC enables --as-needed by default, attempt
+ dnl to make sure that LIBMULTITHREAD really links with -lthread.
+ dnl Otherwise linking with LIBMULTITHREAD has no effect; then
+ dnl the weak symbols are not defined and thus evaluate to NULL.
+ if test $gl_cv_linker_have_as_needed = yes; then
+ if test $gl_cv_linker_have_push_state = yes; then
+ LIBMULTITHREAD="-Wl,--push-state -Wl,--no-as-needed $LIBMULTITHREAD -Wl,--pop-state"
+ else
+ LIBMULTITHREAD="-Wl,--no-as-needed $LIBMULTITHREAD"
+ fi
+ fi
+ # TODO: May need to modify LTLIBMULTITHREAD similarly.
fi
fi
fi
[Define if references to the GNU Pth multithreading library should be made weak.])
LIBTHREAD=
LTLIBTHREAD=
+ dnl On platforms where GCC enables --as-needed by default, attempt
+ dnl to make sure that LIBMULTITHREAD really links with -lpth.
+ dnl Otherwise linking with LIBMULTITHREAD has no effect; then
+ dnl the weak symbols are not defined and thus evaluate to NULL.
+ if test $gl_cv_linker_have_as_needed = yes; then
+ if test $gl_cv_linker_have_push_state = yes; then
+ LIBMULTITHREAD="-Wl,--push-state -Wl,--no-as-needed $LIBMULTITHREAD -Wl,--pop-state"
+ else
+ LIBMULTITHREAD="-Wl,--no-as-needed $LIBMULTITHREAD"
+ fi
+ fi
+ # TODO: May need to modify LTLIBMULTITHREAD similarly.
fi
fi
else