SXEmacs v22.1.16 is released!

[sxemacs] / m4 / sxe-linker.m4

diff --git a/m4/sxe-linker.m4 b/m4/sxe-linker.m4
index 06d5ac0..aaef866 100644 (file)
--- a/m4/sxe-linker.m4
+++ b/m4/sxe-linker.m4
@@ -34,6 +34,38 @@ dnl     <ADDITIONAL-FLAGS>)
        fi
 ])dnl SXE_CHECK_LINKER_FLAGS
 
+AC_DEFUN([SXE_CHECK_LINK_LIB], [dnl
+dnl just like SXE_CHECK_LINKER_FLAGS but calls the linker with -l <LIB>
+dnl SXE_CHECK_LINK_LIB(<LIB>, <ACTION-IF-FOUND>, <ACTION-IF-NOT-FOUND>,
+dnl     <ADDITIONAL-FLAGS>)
+       AC_MSG_CHECKING([whether library $1 can be linked])
+
+       dnl Some hackery here since AC_CACHE_VAL can't handle a non-literal varname:
+       SXE_LANG_WERROR([push+on])
+       AS_LITERAL_IF([$1], [
+               AC_CACHE_VAL(AS_TR_SH(sxe_cv_[]_AC_LANG_ABBREV[]_flags_$1), [
+                       sxe_save_FLAGS=$[]_AC_LANG_PREFIX[]FLAGS
+                       _AC_LANG_PREFIX[]FLAGS="$4 ${XFLAG} -l$1"
+                       AC_LINK_IFELSE([AC_LANG_PROGRAM()],
+                               AS_TR_SH(sxe_cv_[]_AC_LANG_ABBREV[]_lib_$1)="yes",
+                               AS_TR_SH(sxe_cv_[]_AC_LANG_ABBREV[]_lib_$1)="no")
+                       _AC_LANG_PREFIX[]FLAGS=$sxe_save_FLAGS])], [
+               sxe_save_FLAGS=$[]_AC_LANG_PREFIX[]FLAGS
+               _AC_LANG_PREFIX[]FLAGS="$4 ${XFLAG} -l$1"
+               AC_LINK_IFELSE([AC_LANG_PROGRAM()],
+                       eval AS_TR_SH(sxe_cv_[]_AC_LANG_ABBREV[]_lib_$1)="yes",
+                       eval AS_TR_SH(sxe_cv_[]_AC_LANG_ABBREV[]_lib_$1)="no")
+               _AC_LANG_PREFIX[]FLAGS=$sxe_save_FLAGS])
+       eval sxe_check_linker_lib=$AS_TR_SH(sxe_cv_[]_AC_LANG_ABBREV[]_lib_$1)
+       SXE_LANG_WERROR([pop])
+
+       AC_MSG_RESULT([$sxe_check_linker_lib])
+       if test "$sxe_check_linker_lib" = "yes"; then
+               m4_default([$2], :)
+       else
+               m4_default([$3], :)
+       fi
+])dnl SXE_CHECK_LINK_LIB
 
 AC_DEFUN([SXE_CHECK_LD_ZFLAG], [dnl
        pushdef([LD_ZFLAG], [$1])