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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: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
2015.08.x
Thomas Petazzoni 2013-09-02 18:06:38 +02:00 committed by Peter Korsgaard
parent 859b49ed67
commit 530777aaeb
3 changed files with 30 additions and 17 deletions
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15
package/gcc/Config.in.host
View File

@ -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.

8
package/gcc/gcc-final/gcc-final.mk
View File

@ -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

24
package/gcc/gcc.mk
View File

@ -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