Commit 530777aa authored by Thomas Petazzoni's avatar Thomas Petazzoni Committed by Peter Korsgaard
Browse files

gcc: provide option to enable mudflap support 



The mudflap library is only useful if one uses the -fmudflap gcc
option to do more checks on pointers/arrays. This commit adds an
option to enable/disable mudflap support at the gcc level. By default,
it is disabled, which saves a little bit of build time compared to the
default of gcc which consists in enabling mudflap support.

Since mudflap is now disabled by default, and ensured to never be enabled
on platforms where it is not available, some gcc.mk code that was used to
disable mudflap in problematic configurations can be removed.

Whether -fmudflap is used when building is left to the user.

[Peter: tweak commit text, fix white space]
Signed-off-by: default avatarThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: default avatarPeter Korsgaard <jacmet@sunsite.dk>
parent 859b49ed

package/gcc/Config.in.host

+15 −0
Original line number Diff line number Diff line
@@ -155,3 +155,18 @@ config BR2_GCC_ENABLE_OPENMP 
	depends on !BR2_PTHREADS_NONE && !BR2_avr32 && !BR2_arc

	help

	  Enable OpenMP support for the compiler



config BR2_GCC_ENABLE_LIBMUDFLAP

	bool "Enable libmudflap support"

	# There are architectures, or specific configurations for

	# which mudflap is not supported.

	depends on !BR2_avr32 && !BR2_bfin && !BR2_ARM_INSTRUCTIONS_THUMB && !BR2_powerpc_SPE

	help

	  libmudflap is a gcc library used for the mudflap pointer

	  debugging functionality. It is only needed if you intend to

	  use the -fmudflap gcc flag.



	  See http://gcc.gnu.org/wiki/Mudflap_Pointer_Debugging and

	  the help of the gcc -fmudflap option for more details.



	  If you're unsure, leave this option disabled.

package/gcc/gcc-final/gcc-final.mk

+8 −0
Original line number Diff line number Diff line
@@ -119,6 +119,14 @@ ifeq ($(BR2_INSTALL_OBJC),y) 
HOST_GCC_FINAL_USR_LIBS += libobjc

endif



ifeq ($(BR2_GCC_ENABLE_LIBMUDFLAP),y)

ifeq ($(BR2_TOOLCHAIN_HAS_THREADS),y)

HOST_GCC_FINAL_USR_LIBS += libmudflapth

else

HOST_GCC_FINAL_USR_LIBS += libmudflap

endif

endif



ifneq ($(HOST_GCC_FINAL_USR_LIBS),)

define HOST_GCC_FINAL_INSTALL_USR_LIBS

	mkdir -p $(TARGET_DIR)/usr/lib

package/gcc/gcc.mk

+7 −17
Original line number Diff line number Diff line
@@ -125,6 +125,12 @@ else 
HOST_GCC_COMMON_CONF_OPT += --disable-tls

endif



ifeq ($(BR2_GCC_ENABLE_LIBMUDFLAP),y)

HOST_GCC_COMMON_CONF_OPT += --enable-libmudflap

else

HOST_GCC_COMMON_CONF_OPT += --disable-libmudflap

endif



ifeq ($(BR2_PTHREADS_NONE),y)

HOST_GCC_COMMON_CONF_OPT += \

	--disable-threads \
@@ -198,25 +204,9 @@ HOST_GCC_COMMON_CONF_OPT += \ 
	--with-bugurl="http://bugs.buildroot.net/"

endif



# AVR32 GCC special configuration

ifeq ($(BR2_avr32),y)

HOST_GCC_COMMON_CONF_OPT += --disable-libmudflap

endif



# ARM Thumb and mudflap aren't friends

ifeq ($(BR2_ARM_INSTRUCTIONS_THUMB),y)

HOST_GCC_COMMON_CONF_OPT += --disable-libmudflap

endif



# Blackfin doesn't do mudflap

ifeq ($(BR2_bfin),y)

HOST_GCC_COMMON_CONF_OPT += --disable-libmudflap

endif



# Disable mudflap and enable proper double/long double for SPE ABI

# Enable proper double/long double for SPE ABI

ifeq ($(BR2_powerpc_SPE),y)

HOST_GCC_COMMON_CONF_OPT += \

	--disable-libmudflap \

	--enable-e500_double \

	--with-long-double-128

endif