Merged revision(s) 21840 from branches/OpenMPT-1.30:

Merged revision(s) 21838 from trunk/OpenMPT:
[Fix] build: Autotools: Fix quoting in C++ detection.
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git-svn-id: https://source.openmpt.org/svn/openmpt/branches/OpenMPT-1.28@21842 56274372-70c3-4bfc-bfc3-4c3a0b034d27

build/autotools/configure.ac

@@ -291,13 +291,13 @@ AC_PROG_CC_STDC
 #AC_PROG_CC_C99
 
 # We need C++11 support
-AX_CXX_COMPILE_STDCXX(17, [noext], [optional])
+AX_CXX_COMPILE_STDCXX([17], [noext], [optional])
 AS_IF([test "x$HAVE_CXX17" != "x1"],
  [
-  AX_CXX_COMPILE_STDCXX(14, [noext], [optional])
+  AX_CXX_COMPILE_STDCXX([14], [noext], [optional])
   AS_IF([test "x$HAVE_CXX14" != "x1"],
    [
-    AX_CXX_COMPILE_STDCXX(11, [noext], [mandatory])
+    AX_CXX_COMPILE_STDCXX([11], [noext], [mandatory])
    ],[]
   )
  ],[]