(file_type): New file/function. Extracted from diffutils.

[gnulib.git] / m4 / search-libs.m4

diff --git a/m4/search-libs.m4 b/m4/search-libs.m4
index 1d0cf6e..41c1c04 100644 (file)
--- a/m4/search-libs.m4
+++ b/m4/search-libs.m4
@@ -1,40 +1,38 @@
-#serial 2
+#serial 5
 
 dnl A replacement for autoconf's macro by the same name.  This version
 dnl uses `ac_lib' rather than `i' for the loop variable, but more importantly
-dnl moves the ACTION-IF-FOUND ($3) into the inner `if'-block so that it is
+dnl moves the ACTION-IF-FOUND ([$]3) into the inner `if'-block so that it is
 dnl run only if one of the listed libraries ends up being used (and not in
 dnl the `none required' case.
 dnl I hope it's only temporary while we wait for that version to be fixed.
 undefine([AC_SEARCH_LIBS])
 
-dnl AC_SEARCH_LIBS(FUNCTION, SEARCH-LIBS [, ACTION-IF-FOUND
-dnl            [, ACTION-IF-NOT-FOUND [, OTHER-LIBRARIES]]])
-dnl Search for a library defining FUNC, if it's not already available.
-
-AC_DEFUN(AC_SEARCH_LIBS,
+# AC_SEARCH_LIBS(FUNCTION, SEARCH-LIBS,
+#                [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
+#                [OTHER-LIBRARIES])
+# --------------------------------------------------------
+# Search for a library defining FUNC, if it's not already available.
+AC_DEFUN([AC_SEARCH_LIBS],
 [
-  AC_PREREQ([2.13])
   AC_CACHE_CHECK([for library containing $1], [ac_cv_search_$1],
   [
-    ac_func_search_save_LIBS="$LIBS"
-    ac_cv_search_$1="no"
-    AC_TRY_LINK_FUNC([$1], [ac_cv_search_$1="none required"])
-    if test "$ac_cv_search_$1" = "no"; then
+    ac_func_search_save_LIBS=$LIBS
+    ac_cv_search_$1=no
+    AC_TRY_LINK_FUNC([$1], [ac_cv_search_$1='none required'])
+    if test "$ac_cv_search_$1" = no; then
       for ac_lib in $2; do
        LIBS="-l$ac_lib $5 $ac_func_search_save_LIBS"
-       AC_TRY_LINK_FUNC([$1],
-         [ac_cv_search_$1="-l$ac_lib"
-         break])
+       AC_TRY_LINK_FUNC([$1], [ac_cv_search_$1="-l$ac_lib"; break])
       done
     fi
-    LIBS="$ac_func_search_save_LIBS"
+    LIBS=$ac_func_search_save_LIBS
   ])
 
-  if test "$ac_cv_search_$1" = "no"; then :
+  if test "$ac_cv_search_$1" = no; then :
     $4
   else
-    if test "$ac_cv_search_$1" = "none required"; then :
+    if test "$ac_cv_search_$1" = 'none required'; then :
       $4
     else
       LIBS="$ac_cv_search_$1 $LIBS"