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I'm looking for a way to bail out of a makefile if a certain string is not found when checking the version of a tool.
The grep expression I'm looking to match is:
dplus -VV | grep 'build date and time: Nov 1 2009 19:31:28'
which returns a matching line if the proper version of dplus is installed.
How do I work a conditional into my makefile based upon this expression?
335
* has a special meaning both as a shell globbing character ("wildcard") and as a regular expression metacharacter. You must take both into account, though if you quote your regular expression then you can prevent the shell from treating it specially and ensure that it passes it unchanged to grep .
$$ means be interpreted as a $ by the shell. the $(UNZIP_PATH) gets expanded by make before being interpreted by the shell.
The grep command searches through the file, looking for matches to the pattern specified. To use it type grep , then the pattern we're searching for and finally the name of the file (or files) we're searching in. The output is the three lines in the file that contain the letters 'not'.
To Display Line Numbers with grep MatchesAppend the -n operator to any grep command to show the line numbers. We will search for Phoenix in the current directory, show two lines before and after the matches along with their line numbers.
Here's another way that works in GNU Make:
DPLUSVERSION = $(shell dplus -VV | grep 'build date and time: Nov 1 2009 19:31:28')
target_of_interest: do_things do_things_that_uses_dplus
do_things:
...
do_things_that_uses_dplus:
ifeq ($(DPLUSVERSION),)
$(error proper version of dplus not installed)
endif
...
This target can be something real, or just a PHONY target on which the real ones depend.
170
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