From a3579e7061d233d20170d3d3ac04a04a49be12a1 Mon Sep 17 00:00:00 2001
From: "Evgeny Grin (Karlson2k)" <k2k@narod.ru>
Date: Sun, 3 Apr 2022 19:44:15 +0300
Subject: Added two helper macros to manipulate *FLAGS vars

---
 m4/mhd_append_flag_to_var.m4  | 46 +++++++++++++++++++++++++++++++++++++++++++
 m4/mhd_prepend_flag_to_var.m4 | 46 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 92 insertions(+)
 create mode 100644 m4/mhd_append_flag_to_var.m4
 create mode 100644 m4/mhd_prepend_flag_to_var.m4

diff --git a/m4/mhd_append_flag_to_var.m4 b/m4/mhd_append_flag_to_var.m4
new file mode 100644
index 00000000..ee9e71cd
--- /dev/null
+++ b/m4/mhd_append_flag_to_var.m4
@@ -0,0 +1,46 @@
+# SYNOPSIS
+#
+#   MHD_APPEND_FLAG_TO_VAR([VARIABLE-TO-EXTEND], [FLAG-TO-APPEND])
+#
+# DESCRIPTION
+#
+#   This macro sets VARIABLE-TO-EXTEND to the value of VARIABLE-TO-EXTEND with
+#   appended FLAG-TO-APPEND. If current value of VARIABLE-TO-EXTEND and
+#   FLAG-TO-APPEND are both non-empty strings then space is added between them.
+#
+#   Example usage:
+#
+#     MHD_APPEND_FLAG_TO_VAR([my_CFLAGS], [-Wall])
+#
+#
+# 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_APPEND_FLAG_TO_VAR],[dnl
+m4_ifblank([$1],[m4_fatal([$0: First macro argument must not be empty])])dnl
+m4_bmatch([$1], [\$], [m4_fatal([$0: First macro argument must not contain '$'])])dnl
+m4_bmatch([$1], [,], [m4_fatal([$0: First macro argument must not contain ','])])dnl
+m4_bmatch(_mhd_norm_expd([$1]), [\s],dnl
+[m4_fatal([$0: First macro argument must not contain whitespaces])])dnl
+m4_pushdef([varExtd],_mhd_norm_expd([$1]))dnl
+m4_bmatch([$2],[\$],dnl
+[dnl The second parameter is a variable value
+AS_IF([test -z "_mhd_norm_expd([$2])"],dnl
+[varExtd="${varExtd}"],dnl
+[AS_IF([test -z "${varExtd}"],[varExtd="_mhd_norm_expd([$2])"],[varExtd="${varExtd} _mhd_norm_expd([$2])"])])
+],dnl
+[dnl The second parameter is not a variable value
+m4_ifnblank(_mhd_norm_expd([$2]),dnl
+[AS_IF([test -z "${varExtd}"],[varExtd="_mhd_norm_expd([$2])"],[varExtd="${varExtd} _mhd_norm_expd([$2])"])
+],dnl
+[m4_n([varExtd="${varExtd}"])])])dnl m4_ifnblank m4_bmatch
+m4_popdef([varExtd])dnl
+])dnl AC_DEFUN
diff --git a/m4/mhd_prepend_flag_to_var.m4 b/m4/mhd_prepend_flag_to_var.m4
new file mode 100644
index 00000000..788ce3ca
--- /dev/null
+++ b/m4/mhd_prepend_flag_to_var.m4
@@ -0,0 +1,46 @@
+# SYNOPSIS
+#
+#   MHD_PREPEND_FLAG_TO_VAR([VARIABLE-TO-EXTEND], [FLAG-TO-PREPEND])
+#
+# DESCRIPTION
+#
+#   This macro sets VARIABLE-TO-EXTEND to the value of VARIABLE-TO-EXTEND with
+#   appended FLAG-TO-APPEND. If current value of VARIABLE-TO-EXTEND and
+#   FLAG-TO-APPEND are both non-empty strings then space is added between them.
+#
+#   Example usage:
+#
+#     MHD_PREPEND_FLAG_TO_VAR([my_CFLAGS], [-Wall])
+#
+#
+# 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_PREPEND_FLAG_TO_VAR],[dnl
+m4_ifblank([$1],[m4_fatal([$0: First macro argument must not be empty])])dnl
+m4_bmatch([$1], [\$], [m4_fatal([$0: First macro argument must not contain '$'])])dnl
+m4_bmatch([$1], [,], [m4_fatal([$0: First macro argument must not contain ','])])dnl
+m4_bmatch(_mhd_norm_expd([$1]), [\s],dnl
+[m4_fatal([$0: First macro argument must not contain whitespaces])])dnl
+m4_pushdef([varExtd],_mhd_norm_expd([$1]))dnl
+m4_bmatch([$2],[\$],dnl
+[dnl The second parameter is a variable value
+AS_IF([test -z "_mhd_norm_expd([$2])"],dnl
+[varExtd="${varExtd}"],dnl
+[AS_IF([test -z "${varExtd}"],[varExtd="_mhd_norm_expd([$2])"],[varExtd="_mhd_norm_expd([$2]) ${varExtd}"])])
+],dnl
+[dnl The second parameter is not a variable value
+m4_ifnblank(_mhd_norm_expd([$2]),dnl
+[AS_IF([test -z "${varExtd}"],[varExtd="_mhd_norm_expd([$2])"],[varExtd="_mhd_norm_expd([$2]) ${varExtd}"])
+],dnl
+[m4_n([varExtd="${varExtd}"])])])dnl m4_ifnblank m4_bmatch
+m4_popdef([varExtd])dnl
+])dnl AC_DEFUN
-- 
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