NetCube-Systems-Austria/kumquat-buildroot
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

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

Browse Source 
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: Alexey 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: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
This commit is contained in:
Alexey Brodkin 2015-03-24 16:55:15 +03:00 committed by Thomas Petazzoni
parent 64c10ae691
commit 0fe633cdff
1 changed files with 9 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
package/gcc/gcc.mk
View File

@ -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