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# Sample usage strip-ifdef foo.c -Dmips -DATT
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# will select only code in those ifdefs which are selected by mips and ATT.
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# includes, and defines will be left intact, as will comments
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cat $1 | sed -e "s:^#include:XX#include:g" -e "s:^#define:XX#define:g" > /tmp/tmpx.c
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gcc -E -C /tmp/tmpx.c $@ | sed -e "/^#/d" -e "s:XX#:#:g" -e "/^$/d" | cb