Revision: 18217
http://sourceforge.net/p/edk2/code/18217
Author: abiesheuvel
Date: 2015-08-13 06:02:00 +0000 (Thu, 13 Aug 2015)
Log Message:
-----------
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 <[email protected]>
Reviewed-by: Laszlo Ersek <[email protected]>
Build-tested-by: Laszlo Ersek <[email protected]>
Reviewed-by: Liming Gao <[email protected]>
Modified Paths:
--------------
trunk/edk2/BaseTools/Conf/tools_def.template
Modified: trunk/edk2/BaseTools/Conf/tools_def.template
===================================================================
--- trunk/edk2/BaseTools/Conf/tools_def.template 2015-08-13 00:58:56 UTC
(rev 18216)
+++ trunk/edk2/BaseTools/Conf/tools_def.template 2015-08-13 06:02:00 UTC
(rev 18217)
@@ -3839,8 +3839,8 @@
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
------------------------------------------------------------------------------
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