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Use a nifty macro to make testing gcc features simpler
and much easier to read. -Erik
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17
Rules.mak
17
Rules.mak
@ -125,6 +125,9 @@ TARGET_ARCH:=${shell $(CC) -dumpmachine | sed -e s'/-.*//' \
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-e 's/sh[234]/sh/' \
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-e 's/mips.*/mips/' \
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}
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# A nifty macro to make testing gcc features easier
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check_gcc=$(shell if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; \
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then echo "$(1)"; else echo "$(2)"; fi)
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#--------------------------------------------------------
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# Arch specific compiler optimization stuff should go here.
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@ -132,8 +135,8 @@ TARGET_ARCH:=${shell $(CC) -dumpmachine | sed -e s'/-.*//' \
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# for OPTIMIZATION...
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# use '-Os' optimization if available, else use -O2
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OPTIMIZATION := ${shell if $(CC) -Os -S -o /dev/null -xc /dev/null \
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>/dev/null 2>&1; then echo "-Os"; else echo "-O2" ; fi}
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OPTIMIZATION:=
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OPTIMIZATION+=${call check_gcc,-Os,-O2}
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# Some nice architecture specific optimizations
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ifeq ($(strip $(TARGET_ARCH)),arm)
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@ -141,13 +144,9 @@ ifeq ($(strip $(TARGET_ARCH)),arm)
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endif
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ifeq ($(strip $(TARGET_ARCH)),i386)
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OPTIMIZATION+=-march=i386
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OPTIMIZATION+=${shell if $(CC) -mpreferred-stack-boundary=2 -S -o /dev/null -xc \
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/dev/null >/dev/null 2>&1; then echo "-mpreferred-stack-boundary=2"; fi}
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OPTIMIZATION+=${shell if $(CC) -falign-functions=1 -falign-jumps=0 -falign-loops=0 \
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-S -o /dev/null -xc /dev/null >/dev/null 2>&1; then echo \
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"-falign-functions=1 -falign-jumps=0 -falign-loops=0"; else \
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if $(CC) -malign-functions=0 -malign-jumps=0 -S -o /dev/null -xc \
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/dev/null >/dev/null 2>&1; then echo "-malign-functions=0 -malign-jumps=0"; fi; fi}
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OPTIMIZATION+=$(call check_gcc,-mpreferred-stack-boundary=2,)
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OPTIMIZATION+=$(call check_gcc,-falign-functions=0 -falign-jumps=0 -falign-loops=0,\
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-malign-functions=0 -malign-jumps=0 -malign-loops=0)
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endif
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OPTIMIZATIONS:=$(OPTIMIZATION) -fomit-frame-pointer
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