Hi,
I'm trying to understand this example (form the GNU
manual), which creates dependency files:
%.d: %.c
@set -e; rm -f $@; \
$(CC) -M $(CPPFLAGS) $< > [EMAIL PROTECTED]; \
sed 's,\($*\)\.o[ :]*,\1.o $@ : ,g' < [EMAIL PROTECTED]
> $@; \
rm -f [EMAIL PROTECTED]
Here are my questions:
1. What does "@set -e;" do? Is that a shell command
or make command? I couldn't find anything in man
about it.
2. What is "[EMAIL PROTECTED];"? I know that "$@", when used
alone, represents the target, but what's with all
those dollar signs?
3. Can someone break down the sed command:
sed 's,\($*\)\.o[ :]*,\1.o $@ : ,g' < [EMAIL PROTECTED] > $@;
I've never seen sed used this way before. Eg, I can't
see how the commas are specifying a range, and there
is no -e flag.
Thanks for any clarification,
John
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