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authorWolfgang Denk <wd@denx.de>2011-05-01 12:00:27 (GMT)
committer Denys Vlasenko <vda.linux@googlemail.com>2011-05-02 00:50:46 (GMT)
commit91b77c3953d6b88770e3102fc2ce428e8f9a8f13 (patch)
tree4ac4a83d1d54c92b43aafa982671d9adf82389a1
parent90ea1e34548e36e800b1c9699885167f9b3e9ff0 (diff)
downloadbusybox-91b77c3953d6b88770e3102fc2ce428e8f9a8f13.tar.gz
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Compile options: default to -O2 when -Os is not available
Recent versions of GCC for PowerPC systems suffer from some compiler bugs which prevent the use of "--enable-target-optspace" in their configuration, which makes the compiler option "-Os" unavailable; for reference see http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43810 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48278 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45053 In the result, BusyBox will be compiled without any optimization options, which causes a huge binary (1.8 MiB for default configuration on PPC, built with gcc 54.51 from the Yocto / Poky / OpenEmbedded tool chains). This commit changes behaviour so "-O2" gets used as fallback when "-Os" is not available. This reduces the image size in above test to 1.3 MiB. This is still 10...15% more then what we get with "-Os", but much better than using no optimization at all. Signed-off-by: Wolfgang Denk <wd@denx.de> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
-rw-r--r--Makefile.flags4
1 files changed, 2 insertions, 2 deletions
diff --git a/Makefile.flags b/Makefile.flags
index 363300b..b3e1371 100644
--- a/Makefile.flags
+++ b/Makefile.flags
@@ -58,14 +58,14 @@ CFLAGS += $(call cc-option,-falign-functions=1 -falign-jumps=1 -falign-labels=1
#CFLAGS += $(call cc-option,-Wconversion,)
ifneq ($(CONFIG_DEBUG),y)
-CFLAGS += $(call cc-option,-Os,)
+CFLAGS += $(call cc-option,-Os,$(call cc-option,-O2,))
else
CFLAGS += $(call cc-option,-g,)
#CFLAGS += "-D_FORTIFY_SOURCE=2"
ifeq ($(CONFIG_DEBUG_PESSIMIZE),y)
CFLAGS += $(call cc-option,-O0,)
else
-CFLAGS += $(call cc-option,-Os,)
+CFLAGS += $(call cc-option,-Os,$(call cc-option,-O2,))
endif
endif