configure: added --enable-build-type=TYPE

Useful to quickly define settings combination. Individual settings still
could be overridden by individual parameters.

Added autoconf macros for compiler and linker flags

9 files changed, 599 insertions, 97 deletions

diff --git a/configure.ac b/configure.ac
index ef7424be..c497145e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -28,6 +28,7 @@ AC_CONFIG_AUX_DIR([build-aux])
 AM_INIT_AUTOMAKE([gnu] [check-news] [filename-length-max=99] [tar-v7] [silent-rules] [subdir-objects])
 AC_CONFIG_HEADERS([MHD_config.h])
 AC_CONFIG_MACRO_DIR([m4])
+m4_pattern_forbid([^_?MHD_[A-Z_]+_CC_])dnl
 
 LIB_VERSION_CURRENT=72
 LIB_VERSION_REVISION=0
@@ -71,6 +72,33 @@ AS_IF([test -z "$CC" && test -z "$CPP"], [
   )
 ])
 
+
+AC_MSG_CHECKING([for build type])
+AC_ARG_ENABLE([build-type],
+  [AS_HELP_STRING([[--enable-build-type=TYPE]],
+  [enable build TYPE, a set of configuration parameters; individual settings ]
+  [(asserts, sanitizers, compiler and linker flags) can be overriden by ]
+  [additional configure parameters (debug, neutral, release, release-compact, ]
+  [release-hardened) [neutral]])],
+  [], [enable_build_type=neutral])
+AS_IF([test "x${enable_build_type}" = "x"], [enable_build_type="neutral"])
+AS_VAR_IF([enable_build_type], ["no"], [enable_build_type="neutral"])
+AS_VAR_IF([enable_build_type], ["yes"], [AC_MSG_ERROR([[Missing TYPE for --enable-build-type=]])])
+AS_CASE([${enable_build_type}],
+  [debug], [AC_MSG_RESULT([debug: enable asserts, sanitizers (if any supported), debug information, compiler optimisation for debugging])],
+  [neutral], [AC_MSG_RESULT([neutral: use only user-specified compiler and linker flags])],
+  [release], [AC_MSG_RESULT([release: disable asserts, enable compiler optimisations])],
+  [release-compact], [AC_MSG_RESULT([release-compact: disable asserts, enable compiler optimisations for size, enable compact code])],
+  [release-hardened], [AC_MSG_RESULT([release-hardened: disable asserts, enable compiler optimisations, enable linker and compiler hardening])],
+  [AC_MSG_ERROR([[Unknown build type: ${enable_build_type}]])]
+)
+AS_VAR_IF([enable_build_type], ["neutral"], [:],
+  [
+    # For all non-neutreal build types do not use automatic "-g -O2" for CFLAGS
+    AS_IF([test -z "${CFLAGS}"], [CFLAGS=""])
+  ]
+)
+
 # Checks for programs.
 AC_PROG_AWK
 AC_PROG_GREP
@@ -109,6 +137,86 @@ CPPFLAGS="${CPPFLAGS_ac} ${user_CPPFLAGS}"
 LT_INIT([win32-dll])
 LT_LANG([Windows Resource])
 
+
+CFLAGS="${user_CFLAGS}"
+# Compiler options to always enable (if supported)
+MHD_CHECK_ADD_CC_CFLAG([-fno-strict-aliasing], [CFLAGS_ac])
+
+AS_VAR_IF([enable_build_type],["neutral"],[],
+  [ # Any non-neutral build types
+    MHD_CHECK_ADD_CC_CFLAGS([-Wall -Wnull-dereference -Wdeclaration-after-statement], [CFLAGS_ac])
+    MHD_CHECK_ADD_CC_CFLAGS([-Wredundant-decls -Wtrampolines -Wunsafe-loop-optimizations], [CFLAGS_ac])
+    CFLAGS="${CFLAGS_ac} ${user_CFLAGS}"
+    LDFLAGS="${user_LDFLAGS}"
+    MHD_CHECK_ADD_CC_LDFLAG([-Wl,--warn-common], [LDFLAGS_ac])
+    LDFLAGS="${LDFLAGS_ac} ${user_LDFLAGS}"
+  ]
+)
+AS_VAR_IF([enable_build_type],["debug"],
+  [ # Debug build
+    CFLAGS="${user_CFLAGS}"
+    MHD_FIND_ADD_CC_CFLAG([CFLAGS_ac], [-Og], [-O0])
+    MHD_FIND_ADD_CC_CFLAG([CFLAGS_ac], [-ggdb3], [-g3], [-ggdb], [-g])
+    MHD_CHECK_ADD_CC_CFLAGS([-Wextra -Wdouble-promotion -Wformat=2 -Wformat-overflow=2 -Wformat-truncation=2], [CFLAGS_ac])
+    MHD_CHECK_ADD_CC_CFLAGS([-Wmissing-include-dirs -Wshift-overflow=2 -Wstringop-overflow=4 -Walloc-zero], [CFLAGS_ac])
+    MHD_CHECK_ADD_CC_CFLAGS([-Wduplicated-branches -Wduplicated-cond -Wfloat-equal -Wshadow -Wpointer-arith], [CFLAGS_ac])
+    MHD_CHECK_ADD_CC_CFLAGS([-Wbad-function-cast -Wcast-qual -Wcast-align=strict -Wwrite-strings -Wconversion], [CFLAGS_ac])
+    MHD_CHECK_ADD_CC_CFLAGS([-Wjump-misses-init -Wlogical-op -Waggregate-return -Wstrict-prototypes], [CFLAGS_ac])
+    MHD_CHECK_ADD_CC_CFLAGS([-Wold-style-definition -Wmissing-prototypes -Wformat-security -Wshift-negative-value], [CFLAGS_ac])
+    CFLAGS="${CFLAGS_ac} ${user_CFLAGS}"
+    LDFLAGS="${user_LDFLAGS}"
+    MHD_CHECK_ADD_CC_LDFLAG([-Wl,--enable-long-section-names], [LDFLAGS_ac])
+    LDFLAGS="${LDFLAGS_ac} ${user_LDFLAGS}"
+  ]
+)
+AS_CASE([${enable_build_type}],[release|release-*],
+  [ # All release types
+    CFLAGS="${user_CFLAGS}"
+    AS_VAR_IF([enable_build_type],
+      [release-compact],
+      [
+        AC_CHECK_DECL([MHD_FAVOR_SMALL_CODE],[],
+          [AC_CHECK_DECL([MHD_FAVOR_FAST_CODE],[],
+            [MHD_APPEND_FLAG_TO_VAR([CPPFLAGS_ac],[-DMHD_FAVOR_SMALL_CODE=1])],
+            [/* no includes */])],[/* no includes */])
+        CPPFLAGS="${CPPFLAGS_ac} ${user_CPPFLAGS}"
+        MHD_FIND_ADD_CC_CFLAG([CFLAGS_ac], [-Oz], [-Os], [-O])
+      ],
+      [ # All non-compact release types
+        AC_CHECK_DECL([MHD_FAVOR_SMALL_CODE],[],
+          [AC_CHECK_DECL([MHD_FAVOR_FAST_CODE],[],
+            [MHD_APPEND_FLAG_TO_VAR([CPPFLAGS_ac],[-DMHD_FAVOR_FAST_CODE=1])],
+            [/* no includes */])],[/* no includes */])
+        CPPFLAGS="${CPPFLAGS_ac} ${user_CPPFLAGS}"
+        MHD_FIND_ADD_CC_CFLAG([CFLAGS_ac], [-O2], [-O])
+        MHD_CHECK_ADD_CC_CFLAGS([-fsched-pressure -fira-loop-pressure -fmerge-all-constants], [CFLAGS_ac]) # These flags may improve size, recheck with LTO and linker garbage collection
+        MHD_CHECK_ADD_CC_CFLAGS([-ftree-partial-pre -fgcse-after-reload -fipa-pta], [CFLAGS_ac])
+        MHD_CHECK_ADD_CC_CFLAGS([-fisolate-erroneous-paths-attribute -ffinite-loops -floop-nest-optimize], [CFLAGS_ac])
+        MHD_CHECK_ADD_CC_CFLAGS([-fpredictive-commoning -frename-registers], [CFLAGS_ac])
+        MHD_CHECK_ADD_CC_CFLAGS([-ftree-loop-distribute-patterns -fpeel-loops -fsplit-loops -ftree-vectorize], [CFLAGS_ac])
+      ]
+    )
+
+    AS_VAR_IF([enable_build_type],
+      [release-hardened],
+      [
+        MHD_CHECK_ADD_CC_CFLAGS([-Wformat-security -Wstack-protector], [CFLAGS_ac])
+      ]
+    )
+    AS_VAR_IF([enable_build_type],
+      [ # Flags are not suitable for 'compact' and for 'hardened'
+        MHD_CHECK_ADD_CC_CFLAGS([-ffast-math -fno-trapping-math], [CFLAGS_ac])
+      ]
+    )
+    CFLAGS="${CFLAGS_ac} ${user_CFLAGS}"
+    # W32-specific
+    LDFLAGS="${user_LDFLAGS}"
+    MHD_CHECK_ADD_CC_LDFLAG([-Wl,--disable-long-section-names], [LDFLAGS_ac])
+    LDFLAGS="${LDFLAGS_ac} ${user_LDFLAGS}"
+  ]
+)
+CFLAGS="${CFLAGS_ac} ${user_CFLAGS}"
+
 # Check for headers that are ALWAYS required
 AC_CHECK_HEADERS_ONCE([stdio.h string.h stdint.h errno.h limits.h fcntl.h], [],
   [AC_MSG_ERROR([Compiling libmicrohttpd requires standard POSIX headers files])], [AC_INCLUDES_DEFAULT])
@@ -189,26 +297,80 @@ AC_CHECK_HEADERS([sys/sysctl.h netinet/ip_icmp.h netinet/icmp_var.h], [], [],
   ]]
 )
 
-# Adam shostack suggests the following for Windows:
-# -D_FORTIFY_SOURCE=2 -fstack-protector-all
-AC_ARG_ENABLE([gcc-hardening],
-   [AS_HELP_STRING([--enable-gcc-hardening], [enable compiler security checks])],
-[AS_IF([test x$enableval = xyes],[
-    CFLAGS_ac="${CFLAGS_ac} -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fstack-protector-all"
-    CFLAGS_ac="${CFLAGS_ac} -fwrapv -fPIE -Wstack-protector"
-    CFLAGS_ac="${CFLAGS_ac} --param ssp-buffer-size=1"
+AC_ARG_ENABLE([compiler-hardening],
+  [AS_HELP_STRING([--enable-compiler-hardening], [enable compiler security checks])],
+  [],
+  [AS_CASE([${enable_build_type}],[*-hardened],
+    [enable_compiler_hardening='yes'],[enable_compiler_hardening='no'])]
+)
+AS_VAR_IF([enable_compiler_hardening],["yes"],
+  [
+    CPPFLAGS="${CPPFLAGS_ac} ${user_CPPFLAGS}"
+    AC_CHECK_DECL([_FORTIFY_SOURCE],
+      [MHD_APPEND_FLAG_TO_VAR([CPPFLAGS_ac],[-U_FORTIFY_SOURCE])],
+      [],[/* no includes */])
+    MHD_APPEND_FLAG_TO_VAR([CPPFLAGS_ac],[-D_FORTIFY_SOURCE=2])
+    CPPFLAGS="${CPPFLAGS_ac} ${user_CPPFLAGS}"
+    CFLAGS="${user_CFLAGS}"
+    MHD_FIND_ADD_CC_CFLAG([CFLAGS_ac],[-fstack-protector-strong],[-fstack-protector-all],[-fstack-protector])
+    MHD_CHECK_ADD_CC_CFLAGS([-fstack-clash-protection -ftrivial-auto-var-init=pattern],[CFLAGS_ac])
+    CFLAGS="${CFLAGS_ac} ${user_CFLAGS}"
+    AS_VAR_IF([pic_mode],["no"],[],
+      [
+        AS_VAR_IF([enable_shared],["yes"],[],
+          [
+            # PIE cannot be used for shared lib
+            # PIE static lib can be used within non-PIE application, but
+            # PIE static lib cannot be used in non-PIE shared lib. Let's assume
+            # that static lib will not be used in shared lib
+            CFLAGS="${user_CFLAGS}"
+            # Perform tests with "-pie" enabled
+            LDFLAGS="${LDFLAGS_ac} -pie ${user_LDFLAGS}"
+            MHD_CHECK_ADD_CC_CFLAG([-fPIE],[CFLAGS_ac],
+              [
+                MHD_APPEND_FLAG_TO_VAR([LDFLAGS_ac],[-pie])
+              ],
+              [
+                MHD_CHECK_CC_CFLAG([-fpie],[CFLAGS_ac],
+                  [
+                    MHD_APPEND_FLAG_TO_VAR([LDFLAGS_ac],[-pie])
+                  ]
+                )
+              ]
+            )
+            CFLAGS="${CFLAGS_ac} ${user_CFLAGS}"
+            LDFLAGS="${LDFLAGS_ac} ${user_LDFLAGS}"
+          ]
+        )
+      ]
+    )
     CFLAGS="${CFLAGS_ac} ${user_CFLAGS}"
-    LDFLAGS_ac="${LDFLAGS_ac} -pie"
     LDFLAGS="${LDFLAGS_ac} ${user_LDFLAGS}"
- ])])
+  ]
+)
 
 # Linker hardening options
-# Currently these options are ELF specific - you can't use this with MacOSX
+# Currently these options are ELF specific, they don't work on Darwin and W32
 AC_ARG_ENABLE([linker-hardening],
   [AS_HELP_STRING([--enable-linker-hardening], [enable linker security fixups])],
-[AS_IF([test x$enableval = xyes],
-   [LDFLAGS_ac="${LDFLAGS_ac} -z relro -z now"])])
-LDFLAGS="${LDFLAGS_ac} ${user_LDFLAGS}"
+  [],
+  [AS_CASE([${enable_build_type}],[*-hardened],
+    [enable_linker_hardening='yes'],[enable_linker_hardening='no'])]
+)
+AS_VAR_IF([enable_linker_hardening],["yes"],
+  [
+    CFLAGS="${CFLAGS_ac} ${user_CFLAGS}"
+    LDFLAGS="${user_LDFLAGS}"
+    MHD_CHECK_ADD_CC_LDFLAG([-Wl,-z,relro],[LDFLAGS_ac],
+      [MHD_CHECK_ADD_CC_LDFLAG([-Wl,-z,now],[LDFLAGS_ac])])
+    # Actually should be "noexec" by default, but let's try to enforce it.
+    MHD_CHECK_ADD_CC_LDFLAG([-Wl,-z,noexecstack],[LDFLAGS_ac])
+    # W32-specific. Some are enabled by default, but they will be enfored to be sure.
+    MHD_CHECK_ADD_CC_LDFLAGS([-Wl,--large-address-aware -Wl,--enable-auto-image-base],[LDFLAGS_ac])
+    MHD_CHECK_ADD_CC_LDFLAGS([-Wl,--dynamicbase -Wl,--nxcompat -Wl,--high-entropy-va],[LDFLAGS_ac])
+    LDFLAGS="${LDFLAGS_ac} ${user_LDFLAGS}"
+  ]
+)
 
 
 AH_TEMPLATE([[HAVE_STDBOOL_H]], [Define to 1 i][f you have the <stdbool.h> header file and <stdbool.h> defines 'bool' type.])
@@ -1059,13 +1221,6 @@ AM_CONDITIONAL([HAVE_LISTEN_SHUTDOWN], [test "x$mhd_cv_host_shtdwn_trgr_select"
 AC_SEARCH_LIBS([sendmsg], [socket], [AC_DEFINE([HAVE_SENDMSG],[1],[Define if your platform supports sendmsg])])
 AC_CHECK_FUNCS([writev])
 
-# set GCC options
-# use '-fno-strict-aliasing', but only if the compiler
-# and linker can take it
-AX_CHECK_LINK_FLAG([-fno-strict-aliasing],
-  [AX_APPEND_COMPILE_FLAGS([-fno-strict-aliasing], [CFLAGS_ac])])
-CFLAGS="${CFLAGS_ac} ${user_CFLAGS}"
-
 AC_C_BIGENDIAN
 AC_C_VARARRAYS
 
@@ -1971,7 +2126,7 @@ MHD_CHECK_FUNC([[nanosleep]], [[#include <time.h>]], [[struct timespec ts2, ts1
 HIDDEN_VISIBILITY_CFLAGS=""
 AH_TEMPLATE([_MHD_EXTERN],[defines how to decorate public symbols w][hile building the library])
 CFLAGS="${user_CFLAGS}"
-MHD_CHECK_CC_FLAG([-fvisibility=hidden],[CFLAGS_ac],
+MHD_CHECK_CC_CFLAG([-fvisibility=hidden],[CFLAGS_ac],
   [
     # NOTE: require setting of errattr_CFLAGS above
     CFLAGS="${CFLAGS_ac} -fvisibility=hidden ${user_CFLAGS} ${errattr_CFLAGS}"
@@ -2893,9 +3048,12 @@ AC_MSG_RESULT([$CPU_COUNT])
 
 AC_MSG_CHECKING([[whether to enable debug asserts]])
 AC_ARG_ENABLE([[asserts]],
-              AS_HELP_STRING([[--enable-asserts]],
-                             [enable test build with debug asserts]),
-              [], [[enable_asserts='no']])
+  [AS_HELP_STRING([[--enable-asserts]],
+    [enable test build with debug asserts])],
+  [],
+  [AS_CASE([${enable_build_type}],[*-hardened],
+    [enable_compiler_hardening='yes'],[enable_compiler_hardening='no'])]
+)
 AS_CASE([[$enable_asserts]], [[yes]], [[:]], [[no]], [[:]], [[enable_asserts='no']])
 AC_MSG_RESULT([[$enable_asserts]])
 
@@ -2956,10 +3114,25 @@ AS_IF([test "x${enable_sanitizers}" = "xno"],
   ],
   [test "x${enable_sanitizers}" = "xauto" || test "x${enable_sanitizers}" = "xauto-optional"],
   [
-    enable_san_address="auto"
-    enable_san_undef="auto"
-    enable_san_leak="auto"
-    enable_san_upoison="auto"
+    AS_VAR_IF([enable_compiler_hardening],["yes"],
+      [
+        AS_VAR_IF([enable_sanitizers],["auto"],
+          [AC_MSG_ERROR([sanitizers cannot be enabled with compiler hardnening])],
+          [AC_MSG_WARN([sanitizers cannot be enabled with compiler hardnening])]
+        )
+        enable_sanitizers="no"
+        enable_san_address="no"
+        enable_san_undef="no"
+        enable_san_leak="no"
+        enable_san_upoison="no"
+      ],
+      [
+        enable_san_address="auto"
+        enable_san_undef="auto"
+        enable_san_leak="auto"
+        enable_san_upoison="auto"
+      ]
+    )
   ],
   [test "x${enable_sanitizers}" = "xauto-fallback"],
   [
diff --git a/m4/mhd_check_add_cc_cflag.m4 b/m4/mhd_check_add_cc_cflag.m4
new file mode 100644
index 00000000..0d110e8c
--- /dev/null
+++ b/m4/mhd_check_add_cc_cflag.m4
@@ -0,0 +1,63 @@
+# SYNOPSIS
+#
+#   MHD_CHECK_ADD_CC_CFLAG([FLAG-TO-TEST], [VARIABLE-TO-EXTEND],
+#                          [ACTION-IF-SUPPORTED], [ACTION-IF-NOT-SUPPORTED])
+#
+# DESCRIPTION
+#
+#   This macro checks whether the specific compiler flag is supported.
+#   The check is performing by appending FLAG-TO-TEST 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_CFLAG([-Wshadow], [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_CFLAG],[dnl
+_MHD_CHECK_ADD_CC_XFLAG([$1],[$2],[$3],[$4],[[CFLAGS]])dnl
+])
+
+
+# SYNOPSIS
+#
+#   _MHD_CHECK_ADD_CC_XFLAG([FLAG-TO-TEST], [VARIABLE-TO-EXTEND],
+#                           [ACTION-IF-SUPPORTED], [ACTION-IF-NOT-SUPPORTED],
+#                           [CFLAGS|LDFLAGS])
+#
+AC_DEFUN([_MHD_CHECK_ADD_CC_XFLAG],[dnl
+  AC_PREREQ([2.64])dnl for AS_VAR_IF, m4_ifnblank, m4_default
+  AC_LANG_ASSERT([C])dnl
+  m4_ifblank([$1], [m4_fatal([First macro argument must not be empty])])dnl
+  m4_bmatch(_mhd_norm_expd([$1]), [\s],dnl
+            [m4_fatal([First macro argument must not contain whitespaces])])dnl
+  m4_bmatch(_mhd_norm_expd([$2]), [\s],dnl
+            [m4_fatal([Second macro argument must not contain whitespaces])])dnl
+  m4_bmatch([$1], [\$], [m4_fatal([$0: First macro argument must not contain '$'])])dnl
+  m4_bmatch([$2], [\$], [m4_fatal([$0: Second macro argument must not contain '$'])])dnl
+  m4_bmatch(_mhd_norm_expd([$5]), [^\(CFLAGS\|LDFLAGS\)$],[],dnl
+   [m4_fatal([$0: Fifth macro argument must be either 'CFLAGS' or 'LDFLAGS; ']_mhd_norm_expd([$5])[' is not supported])])dnl
+  m4_ifnblank([$2],
+    [_MHD_CHECK_CC_XFLAG([$1], [$2],
+      [MHD_APPEND_FLAG_TO_VAR(_mhd_norm_expd([$2]),_mhd_norm_expd([$1]))
+       $3],[$4],[$5])],
+    [_MHD_CHECK_CC_XFLAG([$1],_mhd_norm_expd([$5]),
+      [MHD_APPEND_FLAG_TO_VAR(_mhd_norm_expd([$5]),_mhd_norm_expd([$1]))
+       $3],[$4],[$5])]
+  )
+])
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
+])
diff --git a/m4/mhd_check_add_cc_ldflag.m4 b/m4/mhd_check_add_cc_ldflag.m4
new file mode 100644
index 00000000..132d33ab
--- /dev/null
+++ b/m4/mhd_check_add_cc_ldflag.m4
@@ -0,0 +1,34 @@
+# SYNOPSIS
+#
+#   MHD_CHECK_ADD_CC_LDFLAG([FLAG-TO-TEST], [VARIABLE-TO-EXTEND],
+#                           [ACTION-IF-SUPPORTED], [ACTION-IF-NOT-SUPPORTED])
+#
+# DESCRIPTION
+#
+#   This macro checks whether the specific compiler flag is supported.
+#   The check is performing by appending FLAG-TO-TEST to the value of
+#   VARIABLE-TO-EXTEND (LDFLAGS if not specified), then prepending result to
+#   LDFLAGS (unless VARIABLE-TO-EXTEND is LDFLAGS), 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_LDFLAG([-pie], [additional_LDFLAGS])
+#
+#
+# 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_LDFLAG],[dnl
+_MHD_CHECK_ADD_CC_XFLAG([$1],[$2],[$3],[$4],[[LDFLAGS]])dnl
+])
diff --git a/m4/mhd_check_add_cc_ldflags.m4 b/m4/mhd_check_add_cc_ldflags.m4
new file mode 100644
index 00000000..5b013f29
--- /dev/null
+++ b/m4/mhd_check_add_cc_ldflags.m4
@@ -0,0 +1,39 @@
+# SYNOPSIS
+#
+#   MHD_CHECK_ADD_CC_LDFLAGS([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 (LDFLAGS if not specified), then prepending result to
+#   LDFLAGS (unless VARIABLE-TO-EXTEND is LDFLAGS), 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_LDFLAGS([-W,--strip-all -Wl,--fatal-warnings],
+#                              [additional_LDFLAGS])
+#
+#
+# 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_LDFLAGS],[dnl
+m4_foreach_w([test_flag],[$1],
+[MHD_CHECK_ADD_CC_LDFLAG([test_flag],[$2])
+])dnl
+])
diff --git a/m4/mhd_check_cc_flag.m4 b/m4/mhd_check_cc_cflag.m4
index e6ba38f6..f387495b 100644
--- a/m4/mhd_check_cc_flag.m4
+++ b/m4/mhd_check_cc_cflag.m4
@@ -1,7 +1,7 @@
 # SYNOPSIS
 #
-#   MHD_CHECK_CC_FLAG([FLAG-TO-TEST], [VARIABLE-TO-PREPEND-CFLAGS],
-#                     [ACTION-IF-SUPPORTED], [ACTION-IF-NOT-SUPPORTED])
+#   MHD_CHECK_CC_CFLAG([FLAG-TO-TEST], [VARIABLE-TO-PREPEND-CFLAGS],
+#                      [ACTION-IF-SUPPORTED], [ACTION-IF-NOT-SUPPORTED])
 #
 # DESCRIPTION
 #
@@ -15,14 +15,14 @@
 #
 #   Example usage:
 #
-#     MHD_CHECK_CC_FLAG([-Wshadow], [additional_CFLAGS],
-#                       [additional_CFLAGS="${additional_CFLAGS} -Wshadow"])
+#     MHD_CHECK_CC_CFLAG([-Wshadow], [additional_CFLAGS],
+#                        [additional_CFLAGS="${additional_CFLAGS} -Wshadow"])
 #
 #   Defined cache variable used in check so if any test will not work
 #   correctly on some platform, user may simply fix it by giving cache
 #   variable in configure parameters, for example:
 #
-#     ./configure mhd_cv_cc_fl_supp__wshadow=no
+#     ./configure mhd_cv_cc_fl_supp__Wshadow=no
 #
 #   This simplify building from source on exotic platforms as patching
 #   of configure.ac is not required to change results of tests.
@@ -36,9 +36,19 @@
 #   and this notice are preserved. This file is offered as-is, without any
 #   warranty.
 
-#serial 1
+#serial 2
 
-AC_DEFUN([MHD_CHECK_CC_FLAG],[dnl
+AC_DEFUN([MHD_CHECK_CC_CFLAG],[dnl
+_MHD_CHECK_CC_XFLAG([$1],[$2],[$3],[$4],[[CFLAGS]])dnl
+])
+
+# SYNOPSIS
+#
+#   _MHD_CHECK_CC_XFLAG([FLAG-TO-TEST], [VARIABLE-TO-PREPEND-CFLAGS],
+#                       [ACTION-IF-SUPPORTED], [ACTION-IF-NOT-SUPPORTED],
+#                       [CFLAGS|LDFLAGS])
+#
+AC_DEFUN([_MHD_CHECK_CC_XFLAG],[dnl
   AC_PREREQ([2.64])dnl for AS_VAR_IF, m4_ifnblank
   AC_LANG_ASSERT([C])dnl
   AC_REQUIRE([AC_PROG_CC])dnl
@@ -49,18 +59,20 @@ AC_DEFUN([MHD_CHECK_CC_FLAG],[dnl
             [m4_fatal([$0: Second macro argument must not contain whitespaces])])dnl
   m4_bmatch([$1], [\$], [m4_fatal([$0: First macro argument must not contain '$'])])dnl
   m4_bmatch([$2], [\$], [m4_fatal([$0: Second macro argument must not contain '$'])])dnl
-  AC_REQUIRE([MHD_FIND_CC_FLAG_WARNPARAMS])dnl sets 'mhd_CFLAGS_params_warn' variable
-  _MHD_CHECK_CC_FLAG_BODY([$1],[$2],[$3],[$4],[mhd_CFLAGS_params_warn])dnl
+  AC_REQUIRE([MHD_FIND_CC_XFLAG_WARNPARAMS])dnl sets 'mhd_xFLAGS_params_warn' variable
+  m4_bmatch(_mhd_norm_expd([$5]), [^\(CFLAGS\|LDFLAGS\)$],[],dnl
+   [m4_fatal([$0: Fifth macro argument must be either 'CFLAGS' or 'LDFLAGS; ']_mhd_norm_expd([$5])[' is not supported])])dnl
+  _MHD_CHECK_CC_XFLAG_BODY([$1],[$2],[$3],[$4],[mhd_xFLAGS_params_warn],[$5])dnl
 ])
 
 
 # SYNOPSIS
 #
-#   _MHD_CHECK_CC_FLAG_BODY([FLAG-TO-TEST], [VARIABLE-TO-PREPEND-CFLAGS],
-#                           [ACTION-IF-SUPPORTED], [ACTION-IF-NOT-SUPPORTED],
-#                           [VARIABLE-TO-ENABLE-WARNS])
+#   _MHD_CHECK_CC_XFLAG_BODY([FLAG-TO-TEST], [VARIABLE-TO-PREPEND-CFLAGS],
+#                            [ACTION-IF-SUPPORTED], [ACTION-IF-NOT-SUPPORTED],
+#                            [VARIABLE-TO-ENABLE-WARNS], [CFLAGS|LDFLAGS])
 #
-AC_DEFUN([_MHD_CHECK_CC_FLAG_BODY],[dnl
+AC_DEFUN([_MHD_CHECK_CC_XFLAG_BODY],[dnl
   AC_LANG_ASSERT([C])dnl
   m4_ifblank([$1], [m4_fatal([$0: First macro argument must not be empty])])dnl
   m4_bmatch(_mhd_norm_expd([$1]), [\s],dnl
@@ -71,18 +83,22 @@ AC_DEFUN([_MHD_CHECK_CC_FLAG_BODY],[dnl
   m4_bmatch([$2], [\$], [m4_fatal([$0: Second macro argument must not contain '$'])])dnl
   m4_ifblank([$5], [m4_fatal([$0: Fifth macro argument must not be empty])])dnl
   m4_bmatch([$5], [\$], [m4_fatal([$0: Fifth macro argument must not contain '$'])])dnl
-  AS_VAR_PUSHDEF([cv_Var], [mhd_cv_cc_fl_supp_]m4_bpatsubst(m4_tolower(_mhd_norm_expd([$1])),[[^a-z0-9]],[_]))dnl
-  dnl
+  m4_bmatch(_mhd_norm_expd([$6]), [^\(CFLAGS\|LDFLAGS\)$],[],dnl
+   [m4_fatal([$0: Sixth macro argument must be either 'CFLAGS' or 'LDFLAGS; ']_mhd_norm_expd([$6])[' is not supported])])dnl
+  m4_pushdef([XFLAGS],_mhd_norm_expd([$6]))dnl
+  dnl Keep uppercase letters to avoid clashes for parameters like -fPIE and -fpie
+  AS_VAR_PUSHDEF([cv_Var],[mhd_cv_cc_]m4_tolower(m4_substr(_mhd_norm_expd([$6]),0,1))[fl_supp_]m4_bpatsubst(_mhd_norm_expd([$1]),[[^a-zA-Z0-9]],[_]))dnl
+
   AC_CACHE_CHECK([whether $[]CC supports _mhd_norm_expd([$1]) flag], cv_Var,
     [dnl
-      AS_VAR_PUSHDEF([save_CFLAGS_Var], [mhd_check_cc_flag_save_CFLAGS])dnl
-      AS_VAR_SET([save_CFLAGS_Var],["${CFLAGS}"])
+      AS_VAR_PUSHDEF([save_xFLAGS_Var], [mhd_check_cc_flag_save_]XFLAGS)dnl
+      AS_VAR_SET([save_xFLAGS_Var],["${XFLAGS}"])
       m4_ifnblank([$2],[dnl
-        m4_if(_mhd_norm_expd([$2]),[CFLAGS],
-          [CFLAGS="${save_CFLAGS_Var} _mhd_norm_expd([$1]) $[]{_mhd_norm_expd([$5])}"],
-          [CFLAGS="$[]{_mhd_norm_expd([$2])} _mhd_norm_expd([$1]) ${save_CFLAGS_Var} $[]{_mhd_norm_expd([$5])}"])
+        m4_if(_mhd_norm_expd([$2]),[XFLAGS],
+          [XFLAGS="${save_xFLAGS_Var} _mhd_norm_expd([$1]) $[]{_mhd_norm_expd([$5])}"],
+          [XFLAGS="$[]{_mhd_norm_expd([$2])} _mhd_norm_expd([$1]) ${save_xFLAGS_Var} $[]{_mhd_norm_expd([$5])}"])
       ],[dnl
-        CFLAGS="_mhd_norm_expd([$1]) $[]CFLAGS $[]{_mhd_norm_expd([$5])}"
+        XFLAGS="_mhd_norm_expd([$1]) $[]XFLAGS $[]{_mhd_norm_expd([$5])}"
       ])dnl
       mhd_check_cc_flag_save_c_werror_flag="$ac_c_werror_flag"
       ac_c_werror_flag=yes
@@ -95,23 +111,23 @@ int main(void)
       ]])])
       AC_LINK_IFELSE([],
         [AS_VAR_SET([cv_Var],["yes"])],
-        [ [#] Compile and link failed if test flag added
+        [ [#] Compile and link failed with test flag added
           m4_ifnblank([$2],[dnl
-            m4_if(_mhd_norm_expd([$2]),[CFLAGS],
-              [CFLAGS="${save_CFLAGS_Var} $[]{_mhd_norm_expd([$5])}"],
-              [CFLAGS="$[]{_mhd_norm_expd([$2])} ${save_CFLAGS_Var} $[]{_mhd_norm_expd([$5])}"])
+            m4_if(_mhd_norm_expd([$2]),[XFLAGS],
+              [XFLAGS="${save_xFLAGS_Var} $[]{_mhd_norm_expd([$5])}"],
+              [XFLAGS="$[]{_mhd_norm_expd([$2])} ${save_xFLAGS_Var} $[]{_mhd_norm_expd([$5])}"])
           ],[dnl
-            CFLAGS="${save_CFLAGS_Var} $[]{_mhd_norm_expd([$5])}"
+            XFLAGS="${save_xFLAGS_Var} $[]{_mhd_norm_expd([$5])}"
             ])dnl
           AC_LINK_IFELSE([],
             [AS_VAR_SET([cv_Var],["no"])],
-            [ [#] Compile and link failed if test flag removed as well
+            [ [#] Compile and link failed with test flag removed as well
               m4_ifnblank([$2],[dnl
-                m4_if(_mhd_norm_expd([$2]),[CFLAGS],
-                  [CFLAGS="${save_CFLAGS_Var} _mhd_norm_expd([$1])"],
-                  [CFLAGS="$[]{_mhd_norm_expd([$2])} _mhd_norm_expd([$1]) ${save_CFLAGS_Var}"])
+                m4_if(_mhd_norm_expd([$2]),[XFLAGS],
+                  [XFLAGS="${save_xFLAGS_Var} _mhd_norm_expd([$1])"],
+                  [XFLAGS="$[]{_mhd_norm_expd([$2])} _mhd_norm_expd([$1]) ${save_xFLAGS_Var}"])
               ],[dnl
-                CFLAGS="_mhd_norm_expd([$1]) ${save_CFLAGS_Var}"
+                XFLAGS="_mhd_norm_expd([$1]) ${save_xFLAGS_Var}"
               ])dnl
               ac_c_werror_flag="$mhd_check_cc_flag_save_c_werror_flag"
               AC_LINK_IFELSE([],
@@ -123,72 +139,58 @@ int main(void)
         ]
       )
       ac_c_werror_flag="$mhd_check_cc_flag_save_c_werror_flag"
-      AS_VAR_SET([CFLAGS],["${save_CFLAGS_Var}"])
-      AS_UNSET(save_CFLAGS_Var)
-      AS_VAR_POPDEF([save_CFLAGS_Var])dnl
+      AS_VAR_SET([XFLAGS],["${save_xFLAGS_Var}"])
+      AS_UNSET(save_xFLAGS_Var)
+      AS_VAR_POPDEF([save_xFLAGS_Var])dnl
     ]
   )
   m4_ifnblank([$3$4],[dnl
     AS_VAR_IF([cv_Var], ["yes"], [$3], m4_default_nblank([$4]))
     ])dnl
   AS_VAR_POPDEF([cv_Var])dnl
+  m4_popdef([XFLAGS])dnl
 ])
 
 
 #
 # SYNOPSIS
 #
-#   MHD_FIND_CC_FLAG_WARNPARAMS()
+#   MHD_FIND_CC_XFLAG_WARNPARAMS()
 #
-AC_DEFUN([MHD_FIND_CC_FLAG_WARNPARAMS],[dnl
+AC_DEFUN([MHD_FIND_CC_XFLAG_WARNPARAMS],[dnl
   AC_LANG_ASSERT([C])dnl
-  AC_REQUIRE([MHD_FIND_CC_FLAG_WWARN])dnl
-  mhd_CFLAGS_params_warn=''
-  _MHD_CHECK_CC_FLAG_BODY([-Wunused-command-line-argument],[],
+  AC_REQUIRE([MHD_FIND_CC_CFLAG_WWARN])dnl
+  mhd_xFLAGS_params_warn=''
+  _MHD_CHECK_CC_XFLAG_BODY([-Wunused-command-line-argument],[],
     [
-      AS_IF([test -z "$mhd_CFLAGS_params_warn"],
-        [mhd_CFLAGS_params_warn='-Wunused-command-line-argument'],
-        [mhd_CFLAGS_params_warn="$mhd_CFLAGS_params_warn -Wunused-command-line-argument"]
-      )
-    ],[],[mhd_cv_cc_flag_Wwarn]
+      MHD_APPEND_FLAG_TO_VAR([mhd_xFLAGS_params_warn],[-Wunused-command-line-argument])
+    ],[],[mhd_cv_cc_flag_Wwarn],[[CFLAGS]]
   )
-  _MHD_CHECK_CC_FLAG_BODY([-Wignored-optimization-argument],[],
+  _MHD_CHECK_CC_XFLAG_BODY([-Wignored-optimization-argument],[],
     [
-      AS_IF([test -z "$mhd_CFLAGS_params_warn"],
-        [mhd_CFLAGS_params_warn='-Wignored-optimization-argument'],
-        [mhd_CFLAGS_params_warn="$mhd_CFLAGS_params_warn -Wignored-optimization-argument"]
-      )
-    ],[],[mhd_cv_cc_flag_Wwarn]
+      MHD_APPEND_FLAG_TO_VAR([mhd_xFLAGS_params_warn],[-Wignored-optimization-argument])
+    ],[],[mhd_cv_cc_flag_Wwarn],[[CFLAGS]]
   )
-  _MHD_CHECK_CC_FLAG_BODY([-Winvalid-command-line-argument],[],
+  _MHD_CHECK_CC_XFLAG_BODY([-Winvalid-command-line-argument],[],
     [
-      AS_IF([test -z "$mhd_CFLAGS_params_warn"],
-        [mhd_CFLAGS_params_warn='-Winvalid-command-line-argument'],
-        [mhd_CFLAGS_params_warn="$mhd_CFLAGS_params_warn -Winvalid-command-line-argument"]
-      )
-    ],[],[mhd_cv_cc_flag_Wwarn]
+      MHD_APPEND_FLAG_TO_VAR([mhd_xFLAGS_params_warn],[-Winvalid-command-line-argument])
+    ],[],[mhd_cv_cc_flag_Wwarn],[[CFLAGS]]
   )
-  _MHD_CHECK_CC_FLAG_BODY([-Wunknown-argument],[],
+  _MHD_CHECK_CC_XFLAG_BODY([-Wunknown-argument],[],
     [
-      AS_IF([test -z "$mhd_CFLAGS_params_warn"],
-        [mhd_CFLAGS_params_warn='-Wunknown-argument'],
-        [mhd_CFLAGS_params_warn="$mhd_CFLAGS_params_warn -Wunknown-argument"]
-      )
-    ],[],[mhd_cv_cc_flag_Wwarn]
-  )
-  AS_IF([test -z "$mhd_CFLAGS_params_warn"],
-    [mhd_CFLAGS_params_warn="$mhd_cv_cc_flag_Wwarn"],
-    [mhd_CFLAGS_params_warn="$mhd_cv_cc_flag_Wwarn $mhd_CFLAGS_params_warn"]
+      MHD_APPEND_FLAG_TO_VAR([mhd_xFLAGS_params_warn],[-Wunknown-argument])
+    ],[],[mhd_cv_cc_flag_Wwarn],[[CFLAGS]]
   )
+  MHD_PREPEND_FLAG_TO_VAR([mhd_xFLAGS_params_warn],[$mhd_cv_cc_flag_Wwarn])
 ])
 
 
 #
 # SYNOPSIS
 #
-#   MHD_FIND_CC_FLAG_WWARN()
+#   MHD_FIND_CC_CFLAG_WWARN()
 #
-AC_DEFUN([MHD_FIND_CC_FLAG_WWARN],[dnl
+AC_DEFUN([MHD_FIND_CC_CFLAG_WWARN],[dnl
   AC_PREREQ([2.64])dnl for AS_VAR_IF, m4_ifnblank
   AC_REQUIRE([AC_PROG_CC])dnl
   AC_LANG_ASSERT([C])dnl
diff --git a/m4/mhd_check_cc_ldflag.m4 b/m4/mhd_check_cc_ldflag.m4
new file mode 100644
index 00000000..e5f57953
--- /dev/null
+++ b/m4/mhd_check_cc_ldflag.m4
@@ -0,0 +1,43 @@
+# SYNOPSIS
+#
+#   MHD_CHECK_CC_LDFLAG([FLAG-TO-TEST], [VARIABLE-TO-PREPEND-LDFLAGS],
+#                       [ACTION-IF-SUPPORTED], [ACTION-IF-NOT-SUPPORTED])
+#
+# DESCRIPTION
+#
+#   This macro checks whether the specific compiler flag is supported.
+#   The check is performing by prepending FLAG-TO-TEST to LDFLAGS, then
+#   prepending value of VARIABLE-TO-PREPEND-LDFLAGS (if any) to LDFLAGS, and
+#   then performing compile and link test. If test succeed without warnings,
+#   then the flag is considered to be suppoted. Otherwise, if compile and link
+#   without test flag can be done without any warning, the flag is considered
+#   to be unsuppoted.
+#
+#   Example usage:
+#
+#     MHD_CHECK_CC_LDFLAG([-pie], [additional_LDFLAGS],
+#                         [additional_LDFLAGS="${additional_LDFLAGS} -pie"])
+#
+#   Defined cache variable used in check so if any test will not work
+#   correctly on some platform, user may simply fix it by giving cache
+#   variable in configure parameters, for example:
+#
+#     ./configure mhd_cv_cc_fl_supp__wshadow=no
+#
+#   This simplify building from source on exotic platforms as patching
+#   of configure.ac is not required to change results of tests.
+#
+# 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_CC_LDFLAG],[dnl
+_MHD_CHECK_CC_XFLAG([$1],[$2],[$3],[$4],[[LDFLAGS]])dnl
+])
diff --git a/m4/mhd_find_add_cc_cflag.m4 b/m4/mhd_find_add_cc_cflag.m4
new file mode 100644
index 00000000..7afc0f39
--- /dev/null
+++ b/m4/mhd_find_add_cc_cflag.m4
@@ -0,0 +1,70 @@
+# SYNOPSIS
+#
+#   MHD_FIND_ADD_CC_CFLAG([VARIABLE-TO-EXTEND],
+#                         [FLAG1-TO-TEST], [FLAG2-TO-TEST], ...)
+#
+# DESCRIPTION
+#
+#   This macro checks whether the specific compiler flags are supported.
+#   The flags are checked one-by-one. The checking is stopped when the first
+#   supported flag found.
+#   The checks are performing by appending FLAGx-TO-TEST to the value of
+#   VARIABLE-TO-EXTEND (CFLAGS if not specified), then prepending result to
+#   CFLAGS (unless VARIABLE-TO-EXTEND is CFLAGS), and then performing compile
+#   and link test. If test succeed without warnings, then the flag is added to
+#   VARIABLE-TO-EXTEND and next flags are not checked. If compile-link cycle
+#   cannot be performed without warning with all tested flags, no flag is
+#   added to the VARIABLE-TO-EXTEND.
+#
+#   Example usage:
+#
+#     MHD_CHECK_CC_CFLAG([additional_CFLAGS],
+#                        [-ggdb3], [-g3], [-ggdb], [-g])
+#
+#   Note: Unlike others MHD_CHECK_*CC_CFLAG* macro, this macro uses another
+#   order of parameters.
+#
+# LICENSE
+#
+#   Copyright (c) 2022 Karlson2k (Evgeny Grin) <k2k@narod.ru>
+#
+#   Copying and distribution of this file, with or without modification, are
+#   permitted in any medium without royalty provided the copyright notice
+#   and this notice are preserved. This file is offered as-is, without any
+#   warranty.
+
+#serial 1
+
+AC_DEFUN([MHD_FIND_ADD_CC_CFLAG],[dnl
+_MHD_FIND_ADD_CC_XFLAG([[CFLAGS]],$@)])
+
+
+# SYNOPSIS
+#
+#   _MHD_FIND_ADD_CC_XFLAG([CFLAGS|LDFLAGS],
+#                          [VARIABLE-TO-EXTEND],
+#                          [FLAG1-TO-TEST], [FLAG2-TO-TEST], ...)
+#
+AC_DEFUN([_MHD_FIND_ADD_CC_XFLAG],[dnl
+  AC_PREREQ([2.64])dnl for m4_ifnblank
+  AC_LANG_ASSERT([C])dnl
+  m4_if(m4_eval([$# >= 3]), [0], [m4_fatal([$0: Macro must have at least three parameters])])dnl
+  m4_ifblank([$3],[m4_fatal([$0: Third macro argument must not be empty])])dnl
+  m4_bmatch(_mhd_norm_expd([$1]), [^\(CFLAGS\|LDFLAGS\)$],[],dnl
+   [m4_fatal([$0: First macro argument must be either 'CFLAGS' or 'LDFLAGS; ']_mhd_norm_expd([$5])[' is not supported])])dnl
+  m4_ifnblank([$2],[_MHD_FIND_ADD_CC_XFLAG_BODY($@)],dnl
+  [_MHD_FIND_ADD_CC_XFLAG_BODY([$1],[$1],m4_shift2($@))])dnl
+])
+
+
+m4_define([_MHD_FIND_ADD_CC_XFLAG_BODY],[dnl
+m4_version_prereq([2.64])dnl for m4_ifnblank
+m4_if([$#],[0],[m4_fatal([$0: no parameters])])dnl
+m4_bmatch(_mhd_norm_expd([$1]),[^\(CFLAGS\|LDFLAGS\)$],[],dnl
+[m4_fatal([$0: First macro argument must be either 'CFLAGS' or 'LDFLAGS; ']_mhd_norm_expd([$5])[' is not supported])])dnl
+m4_if([$#],[1],[m4_fatal([$0: not enough parameters])])dnl
+m4_if([$#],[2],[m4_fatal([$0: not enough parameters])])dnl
+m4_if([$#],[3],[m4_ifnblank([$3],[_MHD_CHECK_ADD_CC_XFLAG([$3],[$2],[],[],[$1])])],
+[m4_ifnblank([$3],[_MHD_CHECK_ADD_CC_XFLAG([$3],[$2],[],[$0([$1],[$2],m4_shift3($@))],[$1])],
+[$0([$1],[$2],m4_shift3($@))])])dnl
+])
diff --git a/m4/mhd_find_add_cc_ldflag.m4 b/m4/mhd_find_add_cc_ldflag.m4
new file mode 100644
index 00000000..224a4e29
--- /dev/null
+++ b/m4/mhd_find_add_cc_ldflag.m4
@@ -0,0 +1,39 @@
+# SYNOPSIS
+#
+#   MHD_FIND_ADD_CC_LDFLAG([VARIABLE-TO-EXTEND],
+#                         [FLAG1-TO-TEST], [FLAG2-TO-TEST], ...)
+#
+# DESCRIPTION
+#
+#   This macro checks whether the specific compiler flags are supported.
+#   The flags are checked one-by-one. The checking is stopped when the first
+#   supported flag found.
+#   The checks are performing by appending FLAGx-TO-TEST to the value of
+#   VARIABLE-TO-EXTEND (LDFLAGS if not specified), then prepending result to
+#   LDFLAGS (unless VARIABLE-TO-EXTEND is LDFLAGS), and then performing compile
+#   and link test. If test succeed without warnings, then the flag is added to
+#   VARIABLE-TO-EXTEND and next flags are not checked. If compile-link cycle
+#   cannot be performed without warning with all tested flags, no flag is
+#   added to the VARIABLE-TO-EXTEND.
+#
+#   Example usage:
+#
+#     MHD_CHECK_CC_LDFLAG([additional_LDFLAGS],
+#                        [-Wl,--strip-all], [-Wl,--strip-debug])
+#
+#   Note: Unlike others MHD_CHECK_*CC_LDFLAG* macro, this macro uses another
+#   order of parameters.
+#
+# 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_FIND_ADD_CC_LDFLAG],[dnl
+_MHD_FIND_ADD_CC_XFLAG([[LDFLAGS]],$@)])