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| author | Eric Andersen <andersen@codepoet.org> | 2002-01-01 22:16:45 +0000 |
|---|---|---|
| committer | Eric Andersen <andersen@codepoet.org> | 2002-01-01 22:16:45 +0000 |
| commit | 06d634eab66c7ebce0fe02d87b2c0b48ac4fa72b (patch) | |
| tree | b2b74e4d34b78b42775b329bfa0c07403638570e /Rules.mak | |
| parent | 4643b181bdf1d9121f9d6d4214e991e7b9f52d30 (diff) | |
Support arch specific optimizations (examples shown for x86 and ARM).
Autodetect target architecture by asking the compiler.
-Erik
Diffstat (limited to 'Rules.mak')
| -rw-r--r-- | Rules.mak | 21 |
1 files changed, 19 insertions, 2 deletions
@@ -38,11 +38,28 @@ BUILDTIME = ${shell TZ=UTC date --utc "+%Y.%m.%d-%H:%M%z"} GCCINCDIR = ${shell $(CC) -print-search-dirs | sed -ne "s/install: \(.*\)/\1include/gp"} NATIVE_ARCH = ${shell uname -m | sed -e 's/i.86/i386/' -e 's/sparc.*/sparc/' \ -e 's/arm.*/arm/g' -e 's/m68k.*/m68k/' -e 's/ppc/powerpc/g'} +TARGET_ARCH=${shell $(CC) -dumpmachine | sed -e s'/-linux//' -e 's/i.86/i386/' -e 's/sparc.*/sparc/' \ + -e 's/arm.*/arm/g' -e 's/m68k.*/m68k/' -e 's/ppc/powerpc/g'} -# use '-Os' optimization if available, else use -O2, allow Config to override +# Some nice architecture specific optimizations ifndef OPTIMIZATION +# use '-Os' optimization if available, else use -O2, allow Config to override OPTIMIZATION = ${shell if $(CC) -Os -S -o /dev/null -xc /dev/null >/dev/null 2>&1; \ then echo "-Os"; else echo "-O2" ; fi} +ifeq ($(strip $(TARGET_ARCH)),arm) + OPTIMIZATION+=-fstrict-aliasing +endif +ifeq ($(strip $(TARGET_ARCH)),i386) + OPTIMIZATION+=-march=i386 + OPTIMIZATION += ${shell if $(CC) -mpreferred-stack-boundary=2 -S -o /dev/null -xc \ + /dev/null >/dev/null 2>&1; then echo "-mpreferred-stack-boundary=2"; fi} + OPTIMIZATION += ${shell if $(CC) -malign-functions=0 -malign-jumps=0 -malign-loops=0 \ + -S -o /dev/null -xc /dev/null >/dev/null 2>&1; then echo \ + "-malign-functions=0 -malign-jumps=0 -malign-loops=0"; fi} + CPUFLAGS+=-pipe +else + CPUFLAGS+=-pipe +endif endif ARFLAGS=r @@ -75,7 +92,7 @@ ifeq ($(strip $(HAVE_SHARED)),true) ifeq ($(strip $(BUILD_UCLIBC_LDSO)),true) LDSO=$(TOPDIR)lib/$(UCLIBC_LDSO) DYNAMIC_LINKER=$(SHARED_LIB_LOADER_PATH)/$(UCLIBC_LDSO) - BUILD_DYNAMIC_LINKER=$(shell cd $(TOPDIR)lib; pwd)/$(UCLIBC_LDSO) + BUILD_DYNAMIC_LINKER=${shell cd $(TOPDIR)lib && pwd}/$(UCLIBC_LDSO) else LDSO=$(SYSTEM_LDSO) DYNAMIC_LINKER=/lib/$(notdir $(SYSTEM_LDSO)) |