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>
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@ -155,3 +155,18 @@ config BR2_GCC_ENABLE_OPENMP
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depends on !BR2_PTHREADS_NONE && !BR2_avr32 && !BR2_arc
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help
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Enable OpenMP support for the compiler
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config BR2_GCC_ENABLE_LIBMUDFLAP
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bool "Enable libmudflap support"
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# There are architectures, or specific configurations for
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# which mudflap is not supported.
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depends on !BR2_avr32 && !BR2_bfin && !BR2_ARM_INSTRUCTIONS_THUMB && !BR2_powerpc_SPE
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help
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libmudflap is a gcc library used for the mudflap pointer
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debugging functionality. It is only needed if you intend to
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use the -fmudflap gcc flag.
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See http://gcc.gnu.org/wiki/Mudflap_Pointer_Debugging and
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the help of the gcc -fmudflap option for more details.
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If you're unsure, leave this option disabled.
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@ -119,6 +119,14 @@ ifeq ($(BR2_INSTALL_OBJC),y)
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HOST_GCC_FINAL_USR_LIBS += libobjc
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endif
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ifeq ($(BR2_GCC_ENABLE_LIBMUDFLAP),y)
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ifeq ($(BR2_TOOLCHAIN_HAS_THREADS),y)
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HOST_GCC_FINAL_USR_LIBS += libmudflapth
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else
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HOST_GCC_FINAL_USR_LIBS += libmudflap
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endif
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endif
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ifneq ($(HOST_GCC_FINAL_USR_LIBS),)
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define HOST_GCC_FINAL_INSTALL_USR_LIBS
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mkdir -p $(TARGET_DIR)/usr/lib
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@ -125,6 +125,12 @@ else
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HOST_GCC_COMMON_CONF_OPT += --disable-tls
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endif
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ifeq ($(BR2_GCC_ENABLE_LIBMUDFLAP),y)
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HOST_GCC_COMMON_CONF_OPT += --enable-libmudflap
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else
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HOST_GCC_COMMON_CONF_OPT += --disable-libmudflap
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endif
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ifeq ($(BR2_PTHREADS_NONE),y)
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HOST_GCC_COMMON_CONF_OPT += \
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--disable-threads \
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@ -198,25 +204,9 @@ HOST_GCC_COMMON_CONF_OPT += \
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--with-bugurl="http://bugs.buildroot.net/"
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endif
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# AVR32 GCC special configuration
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ifeq ($(BR2_avr32),y)
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HOST_GCC_COMMON_CONF_OPT += --disable-libmudflap
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endif
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# ARM Thumb and mudflap aren't friends
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ifeq ($(BR2_ARM_INSTRUCTIONS_THUMB),y)
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HOST_GCC_COMMON_CONF_OPT += --disable-libmudflap
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endif
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# Blackfin doesn't do mudflap
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ifeq ($(BR2_bfin),y)
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HOST_GCC_COMMON_CONF_OPT += --disable-libmudflap
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endif
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# Disable mudflap and enable proper double/long double for SPE ABI
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# Enable proper double/long double for SPE ABI
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ifeq ($(BR2_powerpc_SPE),y)
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HOST_GCC_COMMON_CONF_OPT += \
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--disable-libmudflap \
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--enable-e500_double \
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--with-long-double-128
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endif
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