m4: merge TangentOrg/ddm4

[awesomized/libmemcached] / m4 / ax_switch_flags.m4

diff --git a/m4/ax_switch_flags.m4 b/m4/ax_switch_flags.m4
new file mode 100644 (file)
index 0000000..2939bdd
--- /dev/null
+++ b/m4/ax_switch_flags.m4
@@ -0,0 +1,46 @@
+# ===========================================================================
+#      http://www.gnu.org/software/autoconf-archive/ax_switch_flags.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_SWITCH_FLAGS(newnamespace,[oldnamespace])
+#
+# DESCRIPTION
+#
+#   Switch common compilation flags from temporary variables between two
+#   compilation namespace.
+#
+#   Compilation flags includes: CPPFLAGS, CFLAGS, CXXFLAGS, LDFLAGS, LIBS,
+#   OBJCFLAGS.
+#
+#   By default these flags are restored to a global (empty) namespace, but
+#   user could restore from specific NAMESPACE by using
+#   AX_RESTORE_FLAGS(NAMESPACE) macro.
+#
+#   Typical usage is like:
+#
+#     AX_SAVE_FLAGS(beginprogram)
+#     CPPFLAGS="-Imypackagespath ${CPPFLAGS}"
+#     AX_SWITCH_FLAGS(mypackage,beginprogram)
+#
+# LICENSE
+#
+#   Copyright (c) 2009 Filippo Giunchedi <filippo@esaurito.net>
+#   Copyright (c) 2011 Russ Allbery <rra@stanford.edu>
+#   Copyright (c) 2013 Bastien ROUCARIES <roucaries.bastien+autoconf@gmail.com>
+#
+#   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. This file is offered as-is, without any
+#   warranty.
+
+#serial 2
+
+AC_DEFUN([AX_SWITCH_FLAGS], [
+  AC_REQUIRE(AX_SAVE_FLAGS)
+  AC_REQUIRE(AX_RESTORE_FLAGS)
+  AS_IF([test "X$1" = "X"], AC_MSG_ERROR(newnamespace is empty)]
+  AX_SAVE_FLAGS($1[])
+  AX_RESTORE_FLAGS($2[])
+])