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I want to detect a condition in my makefile where a tool is the wrong version and force the make to fail with an error message indicating the item is not the right version.
Can anyone give an example of doing this?
I tried the following but it is not the right syntax:
ifeq "$(shell svnversion --version | sed s/[^0-9\.]*://)" "1.4" $error("Bad svnversion v1.4, please install v1.6") endif Thanks.
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For that, you can define err_mesg = your multiline error mesage ... endef , and then, $(error $(err_mesg)) . Make will keep and output err_mesg as it was written.
A simple makefile consists of “rules” with the following shape: target … : prerequisites … recipe … … A target is usually the name of a file that is generated by a program; examples of targets are executable or object files. A target can also be the name of an action to carry out, such as ' clean ' (see Phony Targets).
From the manual:
$(error Bad svn version v1.4, please install v1.6) This will result make to a fatal error:
$ make Makefile:2: *** Bad svn version v1.4, please install v1.6. Stop. While $(error... works, sometimes its easier to use a rule that fails
test_svn_version: @if [ $$(svn --version --quiet | \ perl -ne '@a=split(/\./); \ print $$a[0]*10000 + $$a[1]*100 + $$a[2]') \ -lt 10600 ]; \ then \ echo >&2 "Svn version $$(svn --version --quiet) too old; upgrade to v1.6"; false; \ fi Then you make test_svn_version a prerequisite of your top level target.
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