1 files changed, 39 insertions, 0 deletions

diff --git a/m4/mhd_check_add_cc_cflags.m4 b/m4/mhd_check_add_cc_cflags.m4
new file mode 100644
index 00000000..2f13192d
--- /dev/null
+++ b/m4/mhd_check_add_cc_cflags.m4
@@ -0,0 +1,39 @@
+# SYNOPSIS
+#
+#   MHD_CHECK_ADD_CC_CFLAGS([FLAGS-TO-TEST], [VARIABLE-TO-EXTEND])
+#
+# DESCRIPTION
+#
+#   This macro checks whether the specific compiler flags are supported.
+#   The FLAGS-TO-TEST parameter is whitespace-separated flagto to test.
+#   The flags are tested one-by-one, all supported flags are added to the
+#   VARIABLE-TO-EXTEND.
+#   Every flag check is performing by appending one flag to the value of
+#   VARIABLE-TO-EXTEND (CFLAGS if not specified), then prepending result to
+#   CFLAGS (unless VARIABLE-TO-EXTEND is CFLAGS), and then performing compile
+#   and link test. If test succeed without warnings, then the flag is added to
+#   VARIABLE-TO-EXTEND. Otherwise, if compile and link without test flag cannot
+#   be done without any warning, the flag is considered to be unsuppoted.
+#
+#   Example usage:
+#
+#     MHD_CHECK_ADD_CC_CFLAGS([-Wshadow -Walloc-zero -Winit-self],
+#                             [additional_CFLAGS])
+#
+#
+# LICENSE
+#
+#   Copyright (c) 2022 Karlson2k (Evgeny Grin) <k2k@narod.ru>
+#
+#   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 1
+
+AC_DEFUN([MHD_CHECK_ADD_CC_CFLAGS],[dnl
+m4_foreach_w([test_flag],[$1],
+[MHD_CHECK_ADD_CC_CFLAG([test_flag],[$2])
+])dnl
+])