build: turn off strict aliasing

The benchmarks don't show any effect, so turn it off to have one less
thing to worry about. The parser does a lot of casting between AST
nodes.

Signed-off-by: Ran Benita <ran234@gmail.com>

configure.ac

@@ -83,7 +83,7 @@ AX_GCC_BUILTIN(__builtin_popcount)
 AC_CHECK_HEADER([linux/input.h])
 AM_CONDITIONAL(BUILD_LINUX_TESTS, [test "x$ac_cv_header_linux_input_h" = xyes])
 
-XORG_TESTSET_CFLAG([BASE_CFLAGS], [-fvisibility=hidden])
+XORG_TESTSET_CFLAG([BASE_CFLAGS], [-fvisibility=hidden -fno-strict-aliasing -fsanitize-undefined-trap-on-error])
 XORG_TESTSET_CFLAG([BASE_CFLAGS], [-Wextra -Wno-unused-parameter -Wno-missing-field-initializers])
 XORG_TESTSET_CFLAG([BASE_CFLAGS], [-Wdocumentation -Wno-documentation-deprecated-sync])
 

meson.build

@@ -16,6 +16,8 @@ cc = meson.get_compiler('c')
 # Compiler flags.
 foreach cflag: [
     '-fvisibility=hidden',
+    '-fno-strict-aliasing',
+    '-fsanitize-undefined-trap-on-error',
     '-Wextra',
     '-Wno-unused-parameter',
     '-Wno-missing-field-initializers',
@@ -31,7 +33,6 @@ foreach cflag: [
     '-Wdate-time',
     '-Wwrite-strings',
     '-Wno-documentation-deprecated-sync',
-    '-fsanitize-undefined-trap-on-error',
 ]
     if cc.has_argument(cflag)
         add_project_arguments(cflag, language: 'c')