Rename AC_ prefixes to AX_ (only in names of aa macros!).

1 files changed, 41 insertions, 0 deletions

diff --git a/m4/ax_cxx_mutable.m4 b/m4/ax_cxx_mutable.m4
new file mode 100644
index 0000000..e36910d
--- /dev/null
+++ b/m4/ax_cxx_mutable.m4
@@ -0,0 +1,41 @@
+# ===========================================================================
+#         http://www.nongnu.org/autoconf-archive/ax_cxx_mutable.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_CXX_MUTABLE
+#
+# DESCRIPTION
+#
+#   If the compiler allows modifying class data members flagged with the
+#   mutable keyword even in const objects (for example in the body of a
+#   const member function), define HAVE_MUTABLE.
+#
+# LICENSE
+#
+#   Copyright (c) 2008 Todd Veldhuizen
+#   Copyright (c) 2008 Luc Maisonobe <luc@spaceroots.org>
+#
+#   Copying and distribution of this file, with or without modification, are
+#   permitted in any medium without royalty provided the copyright notice
+#   and this notice are preserved.
+
+AC_DEFUN([AX_CXX_MUTABLE],
+[AC_CACHE_CHECK(whether the compiler supports the mutable keyword,
+ac_cv_cxx_mutable,
+[AC_LANG_SAVE
+ AC_LANG_CPLUSPLUS
+ AC_TRY_COMPILE([
+class A { mutable int i;
+          public:
+          int f (int n) const { i = n; return i; }
+        };
+],[A a; return a.f (1);],
+ ac_cv_cxx_mutable=yes, ac_cv_cxx_mutable=no)
+ AC_LANG_RESTORE
+])
+if test "$ac_cv_cxx_mutable" = yes; then
+  AC_DEFINE(HAVE_MUTABLE,,[define if the compiler supports the mutable keyword])
+fi
+])