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Rework optimization code. Be more compiler aware.

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-Erik
This commit is contained in:
Eric Andersen 2002-06-23 04:50:49 +00:00
parent 27f64e1f4e
commit 5b0f9e417e
1 changed files with 36 additions and 6 deletions
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42
Rules.mak
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@ -111,16 +111,46 @@ export VERSION BUILDTIME TOPDIR HOSTCC HOSTCFLAGS CROSS CC AR AS LD NM STRIP CPP
#CROSS_CFLAGS+=-nostdinc -I$(LIBCDIR)/include -I$(GCCINCDIR)
#GCCINCDIR:=$(shell gcc -print-search-dirs | sed -ne "s/install: \(.*\)/\1include/gp")
# use '-Os' optimization if available, else use -O2
OPTIMIZATION:=${shell if $(CC) -Os -S -o /dev/null -xc /dev/null \
>/dev/null 2>&1; then echo "-Os"; else echo "-O2" ; fi}
GCC_STACK_BOUNDRY:=${shell if $(CC) -mpreferred-stack-boundary=2 -S -o /dev/null -xc /dev/null \
>/dev/null 2>&1; then echo "-mpreferred-stack-boundary=2"; else echo "" ; fi}
OPTIMIZATIONS:=$(OPTIMIZATION) -fomit-frame-pointer $(GCC_STACK_BOUNDRY) #-fstrict-aliasing -march=i386 -mcpu=i386 -malign-functions=0 -malign-jumps=0
WARNINGS:=-Wall -Wstrict-prototypes -Wshadow
CFLAGS:=-I$(TOPDIR)include
ARFLAGS:=-r
TARGET_ARCH:=${shell $(CC) -dumpmachine | sed -e s'/-.*//' \
-e 's/i.86/i386/' \
-e 's/sparc.*/sparc/' \
-e 's/arm.*/arm/g' \
-e 's/m68k.*/m68k/' \
-e 's/ppc/powerpc/g' \
-e 's/v850.*/v850/g' \
-e 's/sh[234]/sh/' \
-e 's/mips.*/mips/' \
}
#--------------------------------------------------------
# Arch specific compiler optimization stuff should go here.
# Unless you want to override the defaults, do not set anything
# for OPTIMIZATION...
# use '-Os' optimization if available, else use -O2
OPTIMIZATION := ${shell if $(CC) -Os -S -o /dev/null -xc /dev/null >/dev/null 2>&1; \
then echo "-Os"; else echo "-O2" ; fi}
# Some nice architecture specific optimizations
ifeq ($(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) -falign-functions=1 -falign-jumps=0 -falign-loops=0 \
-S -o /dev/null -xc /dev/null >/dev/null 2>&1; then echo \
"-falign-functions=1 -falign-jumps=0 -falign-loops=0"; else \
if $(CC) -malign-functions=0 -malign-jumps=0 -S -o /dev/null -xc \
/dev/null >/dev/null 2>&1; then echo "-malign-functions=0 -malign-jumps=0"; fi; fi}
endif
OPTIMIZATIONS:=$(OPTIMIZATION) -fomit-frame-pointer
#
#--------------------------------------------------------
# If you're going to do a lot of builds with a non-vanilla configuration,