1 files changed, 73 insertions, 0 deletions
diff --git a/m4/ax_save_flags.m4 b/m4/ax_save_flags.m4
new file mode 100644
index 0000000..b0bba80
--- /dev/null
+++ b/m4/ax_save_flags.m4
@@ -0,0 +1,73 @@
+# SPDX-License-Identifier: FSFAP
+#
+# ===========================================================================
+#      https://www.gnu.org/software/autoconf-archive/ax_save_flags.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_SAVE_FLAGS([NAMESPACE])
+#
+# DESCRIPTION
+#
+#   Save common compilation flags into temporary variables.
+#
+#   Compilation flags includes: CPPFLAGS, CFLAGS, CXXFLAGS, LDFLAGS, LIBS,
+#   OBJCFLAGS.
+#
+#   By default these flags are saved to a global (empty) namespace, but user
+#   could specify a specific NAMESPACE to AX_SAVE_FLAGS macro and latter
+#   restore it by using AX_RESTORE_FLAGS(NAMESPACE).
+#
+#     AX_SAVE_FLAGS(mypackage)
+#     CPPFLAGS="-Imypackagespath ${CPPFLAGS}"
+#     dnl .. do some detection ...
+#     AX_RESTORE_FLAGS(mypackage)
+#
+# LICENSE
+#
+#   Copyright (c) 2009 Filippo Giunchedi <filippo@esaurito.net>
+#   Copyright (c) 2011 The Board of Trustees of the Leland Stanford Junior University
+#   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 8
+
+# list of flag to save
+AC_DEFUN([_AX_SAVE_FLAGS_LIST],[dnl
+[CCASFLAGS],dnl
+[CFLAGS],dnl
+[CPPFLAGS],dnl
+[CXXFLAGS],dnl
+[ERLCFLAGS],dnl
+[FCFLAGS],dnl
+[FCLIBS],dnl
+[FFLAGS],dnl
+[FLIBS],dnl
+[GCJFLAGS],dnl
+[JAVACFLAGS],dnl
+[LDFLAGS],dnl
+[LIBS],dnl
+[OBJCFLAGS],dnl
+[OBJCXXFLAGS],dnl
+[UPCFLAGS],dnl
+[VALAFLAGS]dnl
+])
+
+# save one flag in name space
+AC_DEFUN([_AX_SAVE_ONE_FLAG],[
+  AS_VAR_PUSHDEF([_ax_save_flag_var], [$2[]_$1[]_ax_save_flags])
+  AS_VAR_COPY(_ax_save_flag_var, $2[])
+  AS_VAR_POPDEF([_ax_save_flag_var])
+])
+
+AC_DEFUN([AX_SAVE_FLAGS],[dnl
+   m4_foreach([FLAG], dnl
+	      [_AX_SAVE_FLAGS_LIST()], dnl
+	      [_AX_SAVE_ONE_FLAG([$1],FLAG)])
+])