From: Ard Biesheuvel Date: Thu, 13 Aug 2015 06:02:00 +0000 (+0000) Subject: BaseTools IA32/X64: prevent .eh_frame sections from being generated X-Git-Tag: edk2-stable201903~9068 X-Git-Url: https://git.proxmox.com/?p=mirror_edk2.git;a=commitdiff_plain;h=26ecc55c027d77ebe6d73cb26dd93f814639a279 BaseTools IA32/X64: prevent .eh_frame sections from being generated After the recent GNU linker script changes, the following warning is emitted many times during the OVMF build: BFD: <...>: warning: Empty loadable segment detected, is this intentional ? This is caused by the fact that, now that the section layout has changed somewhat, the .eh_frame section is assigned an ELF segment of its own, which ends up with no contents at all after we strip the .eh_frame section from the output. (Note that the program headers that contain the segment information are completely irrelevant to us since the PE/COFF conversion does not rely on them.) Since we only retain the .eh_frame data for external debugging, and not for things like stack unwinding or generating backtraces at runtime, we can remedy the situation by passing -fno-asynchronous-unwind-tables on the GCC command line. This option instructs the compiler to emit the unwind data into a debug section called .debug_frame instead of into .eh_frame. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Ard Biesheuvel Reviewed-by: Laszlo Ersek Build-tested-by: Laszlo Ersek Reviewed-by: Liming Gao git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18217 6f19259b-4bc3-4df7-8a09-765794883524 --- diff --git a/BaseTools/Conf/tools_def.template b/BaseTools/Conf/tools_def.template index 6e2d4909b9..859fbe14ad 100644 --- a/BaseTools/Conf/tools_def.template +++ b/BaseTools/Conf/tools_def.template @@ -3839,8 +3839,8 @@ DEFINE GCC_ARM_RC_FLAGS = -I binary -O elf32-littlearm -B arm DEFINE GCC_AARCH64_RC_FLAGS = -I binary -O elf64-littleaarch64 -B aarch64 --rename-section .data=.hii DEFINE GCC44_ALL_CC_FLAGS = -g -fshort-wchar -fno-strict-aliasing -Wall -Werror -Wno-array-bounds -ffunction-sections -fdata-sections -c -include AutoGen.h -DSTRING_ARRAY_NAME=$(BASE_NAME)Strings -DEFINE GCC44_IA32_CC_FLAGS = DEF(GCC44_ALL_CC_FLAGS) -m32 -malign-double -fno-stack-protector -D EFI32 -DEFINE GCC44_X64_CC_FLAGS = DEF(GCC44_ALL_CC_FLAGS) -m64 -fno-stack-protector "-DEFIAPI=__attribute__((ms_abi))" -DNO_BUILTIN_VA_FUNCS -mno-red-zone -Wno-address -mcmodel=large +DEFINE GCC44_IA32_CC_FLAGS = DEF(GCC44_ALL_CC_FLAGS) -m32 -malign-double -fno-stack-protector -D EFI32 -fno-asynchronous-unwind-tables +DEFINE GCC44_X64_CC_FLAGS = DEF(GCC44_ALL_CC_FLAGS) -m64 -fno-stack-protector "-DEFIAPI=__attribute__((ms_abi))" -DNO_BUILTIN_VA_FUNCS -mno-red-zone -Wno-address -mcmodel=large -fno-asynchronous-unwind-tables DEFINE GCC44_IA32_X64_DLINK_COMMON = -nostdlib -n -q --gc-sections -z common-page-size=0x20 DEFINE GCC44_IA32_X64_ASLDLINK_FLAGS = DEF(GCC44_IA32_X64_DLINK_COMMON) --entry ReferenceAcpiTable -u ReferenceAcpiTable DEFINE GCC44_IA32_X64_DLINK_FLAGS = DEF(GCC44_IA32_X64_DLINK_COMMON) --entry $(IMAGE_ENTRY_POINT) -u $(IMAGE_ENTRY_POINT) -Map $(DEST_DIR_DEBUG)/$(BASE_NAME).map