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-1.29@21841 56274372-70c3-4bfc-bfc3-4c3a0b034d27

build/autotools/configure.ac

@@ -276,13 +276,13 @@ AC_PROG_CC_STDC
 #AC_PROG_CC_C99
 
 # We need C++17 support
-#AX_CXX_COMPILE_STDCXX(20, [noext], [optional])
+#AX_CXX_COMPILE_STDCXX([20], [noext], [optional])
 #AS_IF([test "x$HAVE_CXX20" != "x1"],
 # [
-#  AX_CXX_COMPILE_STDCXX(17, [noext], [mandatory])
+#  AX_CXX_COMPILE_STDCXX([17], [noext], [mandatory])
 # ],[]
 #)
-AX_CXX_COMPILE_STDCXX(17, [noext], [mandatory])
+AX_CXX_COMPILE_STDCXX([17], [noext], [mandatory])
 
 AC_LANG_PUSH([C])
 AX_CHECK_COMPILE_FLAG([-fvisibility=hidden], [CFLAGS="$CFLAGS -fvisibility=hidden"])