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galileo: Omit exception handling unwind tables

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This patch modifies the newlib and Contiki C and C++ compiler flags to
omit exception handling unwind tables (see
http://wiki.dwarfstd.org/index.php?title=Exception_Handling).
Removing these tables saves space in debug builds and has not caused
any readily-apparent functional changes.

Here is the size listing for an example program built without this
patch:
   text	   data	    bss	    dec	    hex	filename
  76002	   1508	  21224	  98734	  181ae	all-timers.galileo

Here is the size listing for the same program with this patch:
   text	   data	    bss	    dec	    hex	filename
  72918	   1508	  21224	  95650	  175a2	all-timers.galileo

The primary motivation for this patch is to help enable UEFI support.
The .eh_frame and .eh_frame_hdr sections that are otherwise generated
are treated as code sections by the EDK2 GenFw program, since they are
read-only alloc sections.  They get grouped with the actual code
sections, ahead of the data sections.  This perturbs symbols and
complicates debugging.
This commit is contained in:
Michael LeMay 2015-07-26 19:28:31 -07:00 committed by Jesus Sanchez-Palencia
parent 38206e3980
commit b915e7d5e3
2 changed files with 10 additions and 3 deletions
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9
cpu/x86/Makefile.x86_common
View file

@ -9,7 +9,14 @@ OBJCOPY = objcopy
SIZE = size
STRIP = strip
CFLAGS += -Wall -fno-asynchronous-unwind-tables
# Omit exception handling unwind tables (see
# http://wiki.dwarfstd.org/index.php?title=Exception_Handling). Removing these
# tables saves space and has not caused any readily-apparent functional
# changes.
#
# Synchronize the unwind table options here with the CFLAGS and CXXFLAGS in
# ./bsp/libc/build_newlib.sh.
CFLAGS += -Wall -fno-asynchronous-unwind-tables -fno-unwind-tables
LDFLAGS += -Wl,-Map=contiki-$(TARGET).map,--build-id=none
ifeq ($(BUILD_RELEASE),1)

4
platform/galileo/bsp/libc/build_newlib.sh
View file

@ -65,8 +65,8 @@ build() {
export COMPILER_AS_FOR_TARGET=as
export COMPILER_LD_FOR_TARGET=ld
export COMPILER_NM_FOR_TARGET=nm
export CFLAGS_FOR_TARGET="-Os -m32 -march=i586 -mtune=i586 -fno-stack-protector -DPREFER_SIZE_OVER_SPEED -ffunction-sections -fdata-sections"
export CXXFLAGS_FOR_TARGET="-Os -m32 -march=i586 -mtune=i586 -fno-stack-protector -DPREFER_SIZE_OVER_SPEED -ffunction-sections -fdata-sections"
export CFLAGS_FOR_TARGET="-Os -m32 -march=i586 -mtune=i586 -fno-stack-protector -DPREFER_SIZE_OVER_SPEED -ffunction-sections -fdata-sections -fno-asynchronous-unwind-tables -fno-unwind-tables"
export CXXFLAGS_FOR_TARGET="-Os -m32 -march=i586 -mtune=i586 -fno-stack-protector -DPREFER_SIZE_OVER_SPEED -ffunction-sections -fdata-sections -fno-asynchronous-unwind-tables -fno-unwind-tables"
mkdir -p install
./configure --target=${TARGET} \