1 files changed, 56 insertions, 0 deletions
diff --git a/autoconf/ast_check_raii.m4 b/autoconf/ast_check_raii.m4
new file mode 100644
index 000000000..e39a43d2e
--- /dev/null
+++ b/autoconf/ast_check_raii.m4
@@ -0,0 +1,56 @@
+dnl check RAII requirements
+dnl
+dnl gcc / llvm-gcc: -fnested-functions
+dnl clang : -fblocks / -fblocks and -lBlocksRuntime"
+AC_DEFUN([AST_CHECK_RAII], [
+	AC_MSG_CHECKING([for RAII support])
+	AST_C_COMPILER_FAMILY=""
+	AC_LINK_IFELSE(
+		[AC_LANG_PROGRAM([], [
+			int main() {
+				#if defined(__clang__)
+				choke
+				#endif
+				return 0;
+			}
+			])
+		],[
+			dnl Nested functions required for RAII implementation
+			AC_MSG_CHECKING(for gcc -fnested-functions)
+			AC_COMPILE_IFELSE(
+				dnl Prototype needed due to http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36774
+				[
+					AC_LANG_PROGRAM([], [auto void foo(void); void foo(void) {}])
+				],[
+					AST_NESTED_FUNCTIONS=""
+					AC_MSG_RESULT(no)
+				],[
+					AST_NESTED_FUNCTIONS="-fnested-functions"
+					AC_MSG_RESULT(yes)
+				]
+			)
+			AC_SUBST(AST_NESTED_FUNCTIONS)
+			AST_C_COMPILER_FAMILY="gcc"
+		],[
+			AC_MSG_CHECKING(for clang -fblocks)
+			if test "`echo "int main(){return ^{return 42;}();}" | ${CC} -o /dev/null -fblocks -x c - 2>&1`" = ""; then
+				AST_CLANG_BLOCKS_LIBS=""
+				AST_CLANG_BLOCKS="-Wno-unknown-warning-option -fblocks"
+				AC_MSG_RESULT(yes)
+			elif test "`echo "int main(){return ^{return 42;}();}" | ${CC} -o /dev/null -fblocks -x c -lBlocksRuntime - 2>&1`" = ""; then
+				AST_CLANG_BLOCKS_LIBS="-lBlocksRuntime"
+				AST_CLANG_BLOCKS="-fblocks"
+				AC_MSG_RESULT(yes)
+			else
+				AC_MSG_ERROR([BlocksRuntime is required for clang, please install libblocksruntime])
+			fi
+			AC_SUBST(AST_CLANG_BLOCKS_LIBS)
+			AC_SUBST(AST_CLANG_BLOCKS)
+			AST_C_COMPILER_FAMILY="clang"
+		]
+	)
+	if test -z "${AST_C_COMPILER_FAMILY}"; then
+		AC_MSG_ERROR([Compiler ${CC} not supported. Mminimum required gcc-4.3 / llvm-gcc-4.3 / clang-3.3 + libblocksruntime-dev])
+	fi
+	AC_SUBST(AST_C_COMPILER_FAMILY)
+])