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GNU Make: Difference between revisions
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==.DELETE_ON_ERROR== | ==Important [http://www.gnu.org/software/autoconf/manual/make/Special-Targets.html#Special-Targets Special Targets]== | ||
===.DELETE_ON_ERROR=== | |||
* Generally, if make fails to build a target, and the target corresponds to a file, you want that file removed. | * Generally, if make fails to build a target, and the target corresponds to a file, you want that file removed. | ||
** Why might this happen? Ctrl-c being pressed during a build. Multiple statements in a build recipe. Memory allocation failure during build. Any number of things. | ** Why might this happen? Ctrl-c being pressed during a build. Multiple statements in a build recipe. Memory allocation failure during build. Any number of things. | ||
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** <tt>kill -9</tt>'ing <tt>make</tt> will prevent this from happening! :/ | ** <tt>kill -9</tt>'ing <tt>make</tt> will prevent this from happening! :/ | ||
* [[gcc]] and some other tools will clean up on error, for some cases. Use <tt>.DELETE_ON_ERROR</tt> to be safe. | * [[gcc]] and some other tools will clean up on error, for some cases. Use <tt>.DELETE_ON_ERROR</tt> to be safe. | ||
===.PHONY:=== | |||
* GNU Make manual section 4.6, "[http://www.gnu.org/software/autoconf/manual/make/Phony-Targets.html#Phony-Targets Phony Targets]" | |||
* <tt>clean</tt>, <tt>all</tt>, <tt>test</tt> targets ought almost always be <tt>.PHONY</tt> | |||
===.DEFAULT:=== | |||
* GNU Make manual section 10.6, "[http://www.gnu.org/software/autoconf/manual/make/Last-Resort.html Defining Last Resort Rules]" | |||
==Make and [[subversion]]== | ==Make and [[subversion]]== | ||
Revision as of 15:07, 19 September 2009
Important Special Targets
.DELETE_ON_ERROR
- Generally, if make fails to build a target, and the target corresponds to a file, you want that file removed.
- Why might this happen? Ctrl-c being pressed during a build. Multiple statements in a build recipe. Memory allocation failure during build. Any number of things.
- By adding .DELETE_ON_ERROR to the Makefile, this becomes the default behavior.
- kill -9'ing make will prevent this from happening! :/
- gcc and some other tools will clean up on error, for some cases. Use .DELETE_ON_ERROR to be safe.
.PHONY:
- GNU Make manual section 4.6, "Phony Targets"
- clean, all, test targets ought almost always be .PHONY
.DEFAULT:
- GNU Make manual section 10.6, "Defining Last Resort Rules"
Make and subversion
- After running make in a pristine tree, the output of svn status ought be empty. Use svn:ignore properties to ignore your generated files.
- Most importantly, svn status should not show any entries in the 'M'odified state. This indicates either generated files being checked into source control, or the build process modifying source in-place (the same thing, really)
- If svn:ignore is properly used, the following rule suffices as a project-independent clean target, assuming the presence of xmlstarlet:
svn --xml --no-ignore status | xmlstarlet sel -t -m //entry -i "wc-status[@item='ignored']" -v @path -n | xargs rm -rf
