On July 15, 2006 09:55 am, Randy McMurchy wrote: > Bruce Dubbs wrote these words on 07/15/06 08:44 CST: > > Robert Connolly wrote: > >> sed 's/^XCFLAGS =$/& -fomit-frame-pointer/' > >> > >> sed 's/^XCFLAGS =/& -fomit-frame-pointer/' > > > > I'd be interested in other opinions. > I fail to see what Robert's sed does. To me, it either:
They match both exactly the same line. If this is the original:
XCFLAGS = -g -O2
sed 's/^XCFLAGS =$/& -fomit-frame-pointer/' will change it into:
XCFLAGS = -g -O2 -fomit-frame-pointer
sed 's/^XCFLAGS =/& -fomit-frame-pointer/' will change it into:
XCFLAGS = -fomit-frame-pointer -g -O2
to XCFLAGS it doesn't make a real difference, but lets say this is our
original line:
CRTSTUFF_CFLAGS = $(GCC_CFLAGS) $(INCLUDES) \
$(MULTILIB_CFLAGS) -g0
the first sed will append to the end of the line, after the \, and the
Makefile will be broken. The second sed will add right after the = and will
not break the Makefile.
robert
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