Commit 0fe633cd authored by Alexey Brodkin's avatar Alexey Brodkin Committed by Thomas Petazzoni
Browse files

gcc: explicitly use C{XX}FLAGS_FOR_TARGET instead of --enable-target-optspace 

The gcc.mk file is passing --enable-target-optspace to gcc configure
script, to ask for space-optimized (-Os) target libraries. However,
passing this option has the effect of overriding any custom
CFLAGS_FOR_TARGET or CXXFLAGS_FOR_TARGET values that may be passed.

These are some situations when it is required to pass custom flags on
buildong
of libgcc:
 * Default flags "-g -Os" lead to build isses as with PowerPC on gcc 4.5
(https://gcc.gnu.org/bugzilla/show_bug.cgi?id=43810

)
 * Particular CPU requires specific instructions for HW support
 * Deep optimizations

Signed-off-by: default avatarAlexey Brodkin <abrodkin@synopsys.com>
Cc: Anton Kolesov <akolesov@synopsys.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Peter Korsgaard <peter@korsgaard.com>
Cc: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: default avatarThomas Petazzoni <thomas.petazzoni@free-electrons.com>
parent 64c10ae6

package/gcc/gcc.mk

+9 −3
Original line number Diff line number Diff line
@@ -100,16 +100,22 @@ HOST_GCC_COMMON_CONF_OPTS = \ 
HOST_GCC_COMMON_CONF_ENV = \

	MAKEINFO=missing



GCC_COMMON_TARGET_CFLAGS = $(TARGET_CFLAGS)

GCC_COMMON_TARGET_CXXFLAGS = $(TARGET_CXXFLAGS)



# http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43810

# Workaround until it's fixed in 4.5.4 or later

ifeq ($(ARCH),powerpc)

ifeq ($(findstring x4.5.,x$(GCC_VERSION)),x4.5.)

HOST_GCC_COMMON_CONF_OPTS += --disable-target-optspace

GCC_COMMON_TARGET_CFLAGS = $(filter-out -Os,$(GCC_COMMON_TARGET_CFLAGS))

GCC_COMMON_TARGET_CXXFLAGS = $(filter-out -Os,$(GCC_COMMON_TARGET_CXXFLAGS))

endif

else

HOST_GCC_COMMON_CONF_OPTS += --enable-target-optspace

endif



# Propagate options used for target software building to GCC target libs

HOST_GCC_COMMON_CONF_ENV += CFLAGS_FOR_TARGET="$(GCC_COMMON_TARGET_CXXFLAGS)"

HOST_GCC_COMMON_CONF_ENV += CXXFLAGS_FOR_TARGET="$(GCC_COMMON_TARGET_CXXFLAGS)"



# libitm needs sparc V9+

ifeq ($(BR2_sparc_v8)$(BR2_sparc_leon3),y)

HOST_GCC_COMMON_CONF_OPTS += --disable-libitm