Enable c++11 mode for older GCC versions

9384b6e4 · Tiago Peixoto · dd390b86 · 9384b6e4
Commit 9384b6e4 authored Nov 17, 2013 by Tiago Peixoto
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configure.ac configure.ac +6 -0

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--- a/configure.ac
+++ b/configure.ac
@@ -54,7 +54,13 @@ AC_ARG_ENABLE([debug], [AS_HELP_STRING([--enable-debug],[compile debug informati
        )

 dnl enable c++11
+old_cxxflags="$CXXFLAGS"
 [CXXFLAGS="${CXXFLAGS} -std=gnu++11"]
+AC_MSG_CHECKING([whether C++ compiler supports -std=gnu++11])
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])],
+    [AC_MSG_RESULT([yes])],
+    [AC_MSG_RESULT([no])]
+    [CXXFLAGS="${old_cxxflags} -std=gnu++0x"])

 dnl set template depth
 [CXXFLAGS="${CXXFLAGS} -ftemplate-depth-150"]