test harness: improve catching of usage errors in script 'test-driver'

[platform/upstream/automake.git] / m4 / vala.m4

diff --git a/m4/vala.m4 b/m4/vala.m4
index d3f73a5..c0104f1 100644 (file)
--- a/m4/vala.m4
+++ b/m4/vala.m4
@@ -1,29 +1,37 @@
 # Autoconf support for the Vala compiler
 
-# Copyright (C) 2008, 2009 Free Software Foundation, Inc.
+# Copyright (C) 2008-2013 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
 
-# serial 3
-
-# Check whether the Vala compiler exists in `PATH'. If it is found, the
-# variable VALAC is set. Optionally a minimum release number of the
-# compiler can be requested.
+# Check whether the Vala compiler exists in $PATH.  If it is found, the
+# variable VALAC is set pointing to its absolute path.  Otherwise, it is
+# simply set to 'valac'.
+# Optionally a minimum release number of the compiler can be requested.
+# If the ACTION-IF-FOUND parameter is given, it will be run if a proper
+# Vala compiler is found.
+# Similarly, if the ACTION-IF-FOUND is given, it will be run if no proper
+# Vala compiler is found.  It defaults to simply print a warning about the
+# situation, but otherwise proceeding with the configuration.
 #
-# AM_PROG_VALAC([MINIMUM-VERSION])
-# --------------------------------
+# AM_PROG_VALAC([MINIMUM-VERSION], [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
+# --------------------------------------------------------------------------
 AC_DEFUN([AM_PROG_VALAC],
-[AC_PATH_PROG([VALAC], [valac], [])
- AS_IF([test -z "$VALAC"],
-   [AC_MSG_WARN([No Vala compiler found.  You will not be able to compile .vala source files.])],
-   [AS_IF([test -n "$1"],
-      [AC_MSG_CHECKING([$VALAC is at least version $1])
-       am__vala_version=`$VALAC --version`
+  [AC_PATH_PROG([VALAC], [valac], [valac])
+   AS_IF([test "$VALAC" != valac && test -n "$1"],
+      [AC_MSG_CHECKING([whether $VALAC is at least version $1])
+       am__vala_version=`$VALAC --version | sed 's/Vala  *//'`
        AS_VERSION_COMPARE([$1], ["$am__vala_version"],
          [AC_MSG_RESULT([yes])],
          [AC_MSG_RESULT([yes])],
          [AC_MSG_RESULT([no])
-          AC_MSG_ERROR([Vala $1 not found.])])])])
-])
+          VALAC=valac])])
+    if test "$VALAC" = valac; then
+      m4_default([$3],
+        [AC_MSG_WARN([no proper vala compiler found])
+         AC_MSG_WARN([you will not be able to compile vala source files])])
+    else
+      m4_default([$2], [:])
+    fi])