compiler.h: add __weak macro

Instead of writing out '__attribute__((weak))' use a shorter form.

Change-Id: If418a1d55052780077febd2d8f2089021f414b91
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/25767
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Justin TerAvest <teravest@chromium.org>

1 files changed, 8 insertions, 7 deletions

diff --git a/src/cpu/x86/smm/smm_module_handler.c b/src/cpu/x86/smm/smm_module_handler.c
index c622e45c3d5d..c2001ec9e2f4 100644
--- a/src/cpu/x86/smm/smm_module_handler.c
+++ b/src/cpu/x86/smm/smm_module_handler.c
@@ -14,6 +14,7 @@
  */
 
 #include <arch/io.h>
+#include <compiler.h>
 #include <console/console.h>
 #include <cpu/x86/smm.h>
 #include <rmodule.h>
@@ -182,10 +183,10 @@ RMODULE_ENTRY(smm_handler_start);
  * entries in the modules make sense. Without default implementations the
  * weak relocations w/o a symbol have a 0 address which is where the modules
  * are linked at. */
-int __attribute__((weak)) mainboard_io_trap_handler(int smif) { return 0; }
-void __attribute__((weak)) cpu_smi_handler(void) {}
-void __attribute__((weak)) northbridge_smi_handler() {}
-void __attribute__((weak)) southbridge_smi_handler() {}
-void __attribute__((weak)) mainboard_smi_gpi(u32 gpi_sts) {}
-int __attribute__((weak)) mainboard_smi_apmc(u8 data) { return 0; }
-void __attribute__((weak)) mainboard_smi_sleep(u8 slp_typ) {}
+int __weak mainboard_io_trap_handler(int smif) { return 0; }
+void __weak cpu_smi_handler(void) {}
+void __weak northbridge_smi_handler() {}
+void __weak southbridge_smi_handler() {}
+void __weak mainboard_smi_gpi(u32 gpi_sts) {}
+int __weak mainboard_smi_apmc(u8 data) { return 0; }
+void __weak mainboard_smi_sleep(u8 slp_typ) {}