From cccd6d9d04e755aa8194ef86d27405021d5a8f4e Mon Sep 17 00:00:00 2001
From: Andrei Karas <akaras@inbox.ru>
Date: Tue, 12 Jul 2016 15:32:18 +0300
Subject: Add omit frame pointer flag if debug flag enabled.

---
 configure    | 31 ++++++++++++++++++++++++++++++-
 configure.ac | 28 ++++++++++++++++++++++++++++
 2 files changed, 58 insertions(+), 1 deletion(-)

diff --git a/configure b/configure
index 12860c38d..9b721dec4 100755
--- a/configure
+++ b/configure
@@ -1,5 +1,5 @@
 #! /bin/sh
-# From configure.ac 6a3c3cc.
+# From configure.ac 302aefb.
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.69.
 #
@@ -5194,6 +5194,8 @@ fi
 
 
 
+
+
 #
 # sanitize Support test
 #
@@ -6064,6 +6066,33 @@ fi
 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 
 
+
+		{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC supports -fno-omit-frame-pointer" >&5
+$as_echo_n "checking whether $CC supports -fno-omit-frame-pointer... " >&6; }
+		OLD_CFLAGS="$CFLAGS"
+		CFLAGS="$CFLAGS -fno-omit-frame-pointer"
+		OLD_LDFLAGS="$LDFLAGS"
+		LDFLAGS="$LDFLAGS -fno-omit-frame-pointer"
+		cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+int foo;
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+
+				{ $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+
+else
+
+				{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+				CFLAGS="$OLD_CFLAGS"
+				LDFLAGS="$OLD_LDFLAGS"
+
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+
+
 	fi
 fi
 
diff --git a/configure.ac b/configure.ac
index 0a86ffb58..e88834722 100644
--- a/configure.ac
+++ b/configure.ac
@@ -789,6 +789,32 @@ AC_DEFUN([AC_CHECK_SANITIZER_FLAG],
 	]
 )
 
+AC_DEFUN([AC_CHECK_FLAG],
+	[
+		AC_MSG_CHECKING([whether $CC supports $1])
+		OLD_CFLAGS="$CFLAGS"
+		CFLAGS="$CFLAGS $1"
+		OLD_LDFLAGS="$LDFLAGS"
+		LDFLAGS="$LDFLAGS $1"
+		AC_COMPILE_IFELSE(
+			[AC_LANG_SOURCE([int foo;])],
+			[
+				AC_MSG_RESULT([yes])
+			],
+			[
+				AC_MSG_RESULT([no])
+				CFLAGS="$OLD_CFLAGS"
+				LDFLAGS="$OLD_LDFLAGS"
+			],
+			[
+				AC_MSG_RESULT([guessing no])
+				CFLAGS="$OLD_CFLAGS"
+				LDFLAGS="$OLD_LDFLAGS"
+			]
+		)
+	]
+)
+
 #
 # sanitize Support test
 #
@@ -1198,10 +1224,12 @@ case $enable_debug in
 	"yes")
 		CFLAGS="$CFLAGS -g"
 		CPPFLAGS="$CPPFLAGS -DDEBUG"
+		AC_CHECK_FLAG(-fno-omit-frame-pointer)
 		;;
 	"gdb")
 		CFLAGS="$CFLAGS -ggdb"
 		CPPFLAGS="$CPPFLAGS -DDEBUG"
+		AC_CHECK_FLAG(-fno-omit-frame-pointer)
 		;;
 esac
 
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