From 5f308d20edf1b6769895aac265314187305ebe1f Mon Sep 17 00:00:00 2001
From: Haru <haru@dotalux.com>
Date: Sun, 3 May 2015 15:33:47 +0200
Subject: Split -fsanitize checks into multiple steps

This will allow fine-grained detection of the sanitizer options
supported by the current compiler.

Signed-off-by: Haru <haru@dotalux.com>
---
 configure.in | 90 +++++++++++++++++++++++++++++++++++-------------------------
 1 file changed, 53 insertions(+), 37 deletions(-)

(limited to 'configure.in')

diff --git a/configure.in b/configure.in
index 3b5420c8b..f8a3fa639 100644
--- a/configure.in
+++ b/configure.in
@@ -302,7 +302,8 @@ AC_ARG_ENABLE(
 	AC_HELP_STRING(
 		[--enable-sanitize@<:@=ARG@:>@],
 		[
-			Sanitize: yes, no, full)
+			Enables sanitizer. (disabled by default)
+			(available options: yes, no, full)
 		]
 	),
 	[
@@ -621,49 +622,64 @@ if test "$enable_lto" != "no" ; then
 	)
 fi
 
+AC_DEFUN(AC_CHECK_SANITIZER_FLAG,
+	[
+		AC_MSG_CHECKING([whether $CC supports -fsanitize=$1])
+		OLD_CFLAGS="$CFLAGS"
+		CFLAGS="$CFLAGS -fsanitize=$1"
+		AC_COMPILE_IFELSE(
+			[AC_LANG_SOURCE([int foo;])],
+			[
+				AC_MSG_RESULT([yes])
+			],
+			[
+				AC_MSG_RESULT([no])
+
+				AC_MSG_CHECKING([whether $CC requires -fsanitize-undefined-trap-on-error for -fsanitize=$1])
+				CFLAGS="$CFLAGS -fsanitize-undefined-trap-on-error"
+				AC_COMPILE_IFELSE(
+					[AC_LANG_SOURCE([int foo;])],
+					[
+						AC_MSG_RESULT([yes])
+					],
+					[
+						AC_MSG_RESULT([no])
+						CFLAGS="$OLD_CFLAGS"
+					]
+				)
+			],
+			[
+				AC_MSG_RESULT([guessing no])
+				CFLAGS="$OLD_CFLAGS"
+			]
+		)
+	]
+)
 
 #
 # sanitize Support test
 #
 if test "$enable_sanitize" != "no" ; then
+	AC_CHECK_SANITIZER_FLAG(address)
 	if test "$enable_sanitize" == "full" ; then
-	# skipped because server have multiply issues -fsanitize=alignment
-		SAN="-fsanitize=address \
--fsanitize=shift -fsanitize=integer-divide-by-zero -fsanitize=unreachable \
--fsanitize=vla-bound -fsanitize=null -fsanitize=return \
--fsanitize=signed-integer-overflow -fsanitize=bounds \
--fsanitize=object-size -fsanitize=float-divide-by-zero -fsanitize=float-cast-overflow \
--fsanitize=nonnull-attribute -fsanitize=returns-nonnull-attribute -fsanitize=bool \
--fsanitize=enum -fsanitize=vptr"
-	else
-		SAN="-fsanitize=address"
+		# skipped because server have multiple issues: -fsanitize=alignment
+		AC_CHECK_SANITIZER_FLAG(shift)
+		AC_CHECK_SANITIZER_FLAG(integer-divide-by-zero)
+		AC_CHECK_SANITIZER_FLAG(unreachable)
+		AC_CHECK_SANITIZER_FLAG(vla-bound)
+		AC_CHECK_SANITIZER_FLAG(null)
+		AC_CHECK_SANITIZER_FLAG(return)
+		AC_CHECK_SANITIZER_FLAG(signed-integer-overflow)
+		AC_CHECK_SANITIZER_FLAG(bounds)
+		AC_CHECK_SANITIZER_FLAG(object-size)
+		AC_CHECK_SANITIZER_FLAG(float-divide-by-zero)
+		AC_CHECK_SANITIZER_FLAG(float-cast-overflow)
+		AC_CHECK_SANITIZER_FLAG(nonnull-attribute)
+		AC_CHECK_SANITIZER_FLAG(returns-nonnull-attribute)
+		AC_CHECK_SANITIZER_FLAG(bool)
+		AC_CHECK_SANITIZER_FLAG(enum, sanitize-undefined-trap-on-error)
+		AC_CHECK_SANITIZER_FLAG(vptr)
 	fi
-
-	OLD_CFLAGS="$CFLAGS"
-	CFLAGS="$CFLAGS $SAN"
-	OLD_LDFLAGS="$LDFLAGS"
-	LDFLAGS="$LDFLAGS $SAN"
-
-	AC_MSG_CHECKING([whether $CC supports $SAN])
-	AC_RUN_IFELSE(
-		[AC_LANG_SOURCE([
-			int main(int argc, char **argv){
-				return 0;
-			}
-		])],
-		[
-			AC_MSG_RESULT([yes])
-		],
-		[
-			AC_MSG_RESULT([no])
-			CFLAGS="$OLD_CFLAGS"
-			LDFLAGS="$OLD_LDFLAGS"
-		],
-		[
-			AC_MSG_RESULT([guessing no])
-		]
-	)
-
 fi
 
 
-- 
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