For ARM architectures, I only disable this flag for RELEASE build: $ grep -r unused-but-set-variable Conf/tools_def.txt DEFINE GCC46_IA32_CC_FLAGS = DEF(GCC45_IA32_CC_FLAGS) -Wno-address -Wno-unused-but-set-variable DEFINE GCC46_X64_CC_FLAGS = DEF(GCC45_X64_CC_FLAGS) -Wno-address -Wno-unused-but-set-variable RELEASE_GCC46_ARM_CC_FLAGS = DEF(GCC46_ARM_CC_FLAGS) -Wno-unused-but-set-variable RELEASE_GCC47_ARM_CC_FLAGS = DEF(GCC47_ARM_CC_FLAGS) -Wno-unused-but-set-variable RELEASE_GCC47_AARCH64_CC_FLAGS = DEF(GCC47_AARCH64_CC_FLAGS) -Wno-unused-but-set-variable RELEASE_GCC48_ARM_CC_FLAGS = DEF(GCC48_ARM_CC_FLAGS) -Wno-unused-but-set-variable RELEASE_GCC48_AARCH64_CC_FLAGS = DEF(GCC48_AARCH64_CC_FLAGS) -Wno-unused-but-set-variable RELEASE_GCC49_ARM_CC_FLAGS = DEF(GCC49_ARM_CC_FLAGS) -Wno-unused-but-set-variable RELEASE_GCC49_AARCH64_CC_FLAGS = DEF(GCC49_AARCH64_CC_FLAGS) -Wno-unused-but-set-variable
-----Original Message----- From: Ard Biesheuvel [mailto:ard.biesheu...@linaro.org] Sent: 08 July 2015 14:24 To: edk2-devel@lists.sourceforge.net; ler...@redhat.com; Olivier Martin; leif.lindh...@linaro.org; jordan.l.jus...@intel.com Cc: roy.fr...@linaro.org; Ard Biesheuvel Subject: [PATCH] BaseTools/GCC: allow unused but set variables This fixes a recurring problem where patches that have only been tested on MS toolchains break the build on GCC because they use variables that are only written but never read. However, there is a valid pattern where this may happen as well. For instance, Status = SomeFunc (&OutVar); ASSERT_EFI_ERROR (Status); if (Outvar == ... ) { ... } // Status never referenced again may never access Status again at all in RELEASE builds, since the ASSERT_EFI_ERROR () macro evaluates to nothing in that case. So let's allow this pattern, by passing the appropriate GCC command line option. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Ard Biesheuvel <ard.biesheu...@linaro.org> --- BaseTools/Conf/tools_def.template | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/BaseTools/Conf/tools_def.template b/BaseTools/Conf/tools_def.template index 7edd7590956b..15d8db04232f 100644 --- a/BaseTools/Conf/tools_def.template +++ b/BaseTools/Conf/tools_def.template @@ -3813,7 +3813,7 @@ NOOPT_DDK3790xASL_IPF_DLINK_FLAGS = /NOLOGO /NODEFAULTLIB /LTCG /DLL /OPT:REF DEBUG_*_*_OBJCOPY_ADDDEBUGFLAG = --add-gnu-debuglink=$(DEBUG_DIR)/$(MODULE_NAME).debug RELEASE_*_*_OBJCOPY_ADDDEBUGFLAG = -DEFINE GCC_ALL_CC_FLAGS = -g -Os -fshort-wchar -fno-strict-aliasing -Wall -Werror -Wno-array-bounds -c -include AutoGen.h +DEFINE GCC_ALL_CC_FLAGS = -g -Os -fshort-wchar -fno-strict-aliasing -Wall -Werror -Wno-array-bounds -c -include AutoGen.h -Wno-error=unused-but-set-variable DEFINE GCC_IA32_CC_FLAGS = DEF(GCC_ALL_CC_FLAGS) -m32 -malign-double -freorder-blocks -freorder-blocks-and-partition -O2 -mno-stack-arg-probe DEFINE GCC_X64_CC_FLAGS = DEF(GCC_ALL_CC_FLAGS) -mno-red-zone -Wno-address -mno-stack-arg-probe DEFINE GCC_IPF_CC_FLAGS = DEF(GCC_ALL_CC_FLAGS) -minline-int-divide-min-latency -- 1.9.1 -- IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you. ARM Limited, Registered office 110 Fulbourn Road, Cambridge CB1 9NJ, Registered in England & Wales, Company No: 2557590 ARM Holdings plc, Registered office 110 Fulbourn Road, Cambridge CB1 9NJ, Registered in England & Wales, Company No: 2548782 ------------------------------------------------------------------------------ Don't Limit Your Business. Reach for the Cloud. GigeNET's Cloud Solutions provide you with the tools and support that you need to offload your IT needs and focus on growing your business. Configured For All Businesses. Start Your Cloud Today. https://www.gigenetcloud.com/ _______________________________________________ edk2-devel mailing list edk2-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/edk2-devel
