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authorArd Biesheuvel <ard.biesheuvel@linaro.org>2015-08-13 06:02:00 +0000
committerabiesheuvel <abiesheuvel@Edk2>2015-08-13 06:02:00 +0000
commit26ecc55c027d77ebe6d73cb26dd93f814639a279 (patch)
tree3361ceb314dd10769a797e4c0bb01c576104d5af /BaseTools/Conf
parented5d1532f9f04fd7e463920787cc4209f72f7602 (diff)
downloadedk2-platforms-26ecc55c027d77ebe6d73cb26dd93f814639a279.tar.xz
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 <ard.biesheuvel@linaro.org> Reviewed-by: Laszlo Ersek <lersek@redhat.com> Build-tested-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Liming Gao <liming.gao@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18217 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'BaseTools/Conf')
-rw-r--r--BaseTools/Conf/tools_def.template4
1 files changed, 2 insertions, 2 deletions
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