From fabe15b29d7db7823568548da998b24e75f2cce8 Mon Sep 17 00:00:00 2001
From: Andrei Karas <akaras@inbox.ru>
Date: Sun, 21 Feb 2016 20:13:47 +0300
Subject: Add same compiler flags what was used in hercules.

---
 configure.ac    | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 src/Makefile.am |  2 +-
 2 files changed, 58 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index 1f8435b..1a0a685 100644
--- a/configure.ac
+++ b/configure.ac
@@ -74,8 +74,64 @@ AC_ARG_ENABLE(
 )
 AM_CONDITIONAL(ENABLE_GPROF, test x$enable_gprof = xyes)
 
-AC_CHECK_FUNC([strnlen],[CFLAGS="$CFLAGS -DHAVE_STRNLEN"])
+AC_DEFUN([AC_CHECK_COMPILER_WFLAG],
+    [
+        AC_MSG_CHECKING([whether $CC supports -W$1])
+        OLD_CFLAGS="$CFLAGS"
+        CFLAGS="$CFLAGS -Werror -W$1"
+        AC_COMPILE_IFELSE(
+            [AC_LANG_SOURCE([int foo;])],
+            [
+                AC_MSG_RESULT([yes])
+                CFLAGS="$OLD_CFLAGS -W$1"
+                # Optionally, run a test
+                if test "x$2" != "x"; then
+                    AC_MSG_CHECKING([whether $CC can actually use -W$1])
+                    CFLAGS="$OLD_CFLAGS -Werror -W$1"
+                    AC_COMPILE_IFELSE(
+                        [AC_LANG_SOURCE([$2])],
+                        [
+                            AC_MSG_RESULT([no])
+                            CFLAGS="$OLD_CFLAGS"
+                        ]
+                        [
+                            AC_MSG_RESULT([yes])
+                            CFLAGS="$OLD_CFLAGS -W$1"
+                        ],
+                    )
+                fi
+            ],
+            [
+                AC_MSG_RESULT([no])
+                CFLAGS="$OLD_CFLAGS"
+            ]
+        )
+    ]
+)
 
+AC_CHECK_COMPILER_WFLAG(empty-body)
+AC_CHECK_COMPILER_WFLAG(newline-eof)
+AC_CHECK_COMPILER_WFLAG(int-conversion)
+AC_CHECK_COMPILER_WFLAG(init-self)
+AC_CHECK_COMPILER_WFLAG(pointer-arith)
+AC_CHECK_COMPILER_WFLAG(switch-bool)
+AC_CHECK_COMPILER_WFLAG(enum-conversion)
+AC_CHECK_COMPILER_WFLAG(shorten-64-to-32)
+AC_CHECK_COMPILER_WFLAG(constant-conversion)
+AC_CHECK_COMPILER_WFLAG(bool-conversion)
+AC_CHECK_COMPILER_WFLAG(format-security)
+AC_CHECK_COMPILER_WFLAG(format)
+AC_CHECK_COMPILER_WFLAG(format-signedness)
+AC_CHECK_COMPILER_WFLAG(format-y2k)
+AC_CHECK_COMPILER_WFLAG(missing-include-dirs)
+AC_CHECK_COMPILER_WFLAG(suggest-attribute=noreturn)
+AC_CHECK_COMPILER_WFLAG(undef)
+
+AC_CHECK_FUNC([strnlen],[CFLAGS="$CFLAGS -DHAVE_STRNLEN"])
 AC_CHECK_FUNC([setrlimit],[CLAGS="$CFLAGS -DHAVE_SETRLIMIT"])
 
+AC_MSG_CHECKING([PCRE library])
+AC_CHECK_HEADER([pcre.h], [], [AC_MSG_ERROR([PCRE header not found])])
+AC_SEARCH_LIBS([pcre_study], [pcre], [], AC_MSG_ERROR([PCRE not found or incompatible]))
+
 AC_OUTPUT(Makefile src/Makefile)
diff --git a/src/Makefile.am b/src/Makefile.am
index 7488e03..c32927f 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -108,7 +108,7 @@ MAP_SRC = emap/atcommand.c \
 
 # need remove -Wno-unused
 
-SHARED_CFLAGS = -pipe -ffast-math -fvisibility=hidden -rdynamic -std=gnu90 -Wall -Wextra -Wno-sign-compare -Wno-unused \
+SHARED_CFLAGS = ${CFLAGS} -pipe -ffast-math -fvisibility=hidden -rdynamic -std=c99 -Wall -Wextra -Wno-sign-compare -Wno-unused \
     -DPCRE_SUPPORT -I../../.. -I../../../../3rdparty -DPACKETVER=20150000
 SHARED_LDFLAGS = -avoid-version -Wl,--no-undefined
 
-- 
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