New file to override autoconf's AC_SEARCH_LIBS.

1 files changed, 44 insertions, 0 deletions

diff --git a/m4/search-libs.m4 b/m4/search-libs.m4
new file mode 100644
index 000000000..6979ea8e5
--- /dev/null
+++ b/m4/search-libs.m4
@@ -0,0 +1,44 @@
+#serial 1
+
+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 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_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
+      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])
+      done
+    fi
+    LIBS="$ac_func_search_save_LIBS"
+  ])
+
+  if test "$ac_cv_search_$1" = "no"; then
+    $4
+  else
+    if test "$ac_cv_search_$1" = "none required"; then
+      $4
+    else :
+      LIBS="$ac_cv_search_$1 $LIBS"
+      $3
+    fi
+  fi
+])