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| author | Luke Shumaker <lukeshu@sbcglobal.net> | 2016-10-28 12:45:33 -0400 |
|---|---|---|
| committer | Luke Shumaker <lukeshu@sbcglobal.net> | 2016-10-28 12:45:33 -0400 |
| commit | 95d18493a5d3399993053b94cb1fc4542699f884 (patch) | |
| tree | d315483cfbdeb297e499ec6b09d1255ea43d3643 /build-aux/Makefile.once.head/00-var.mk | |
| parent | ab69b8e9b4666ba2ad89a27b07b6944feb82eadb (diff) | |
(systemd) Autothing documentation
Diffstat (limited to 'build-aux/Makefile.once.head/00-var.mk')
| -rw-r--r-- | build-aux/Makefile.once.head/00-var.mk | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/build-aux/Makefile.once.head/00-var.mk b/build-aux/Makefile.once.head/00-var.mk index d1e537e..636bbb0 100644 --- a/build-aux/Makefile.once.head/00-var.mk +++ b/build-aux/Makefile.once.head/00-var.mk @@ -14,5 +14,19 @@ # along with this program. If not, see <http://www.gnu.org/licenses/>. mod.var.description = Depend on the values of variables +define mod.var.doc +# Inputs: +# (user-defined) +# Outputs: +# Target : `$(outdir)/.var.%` +# Directory variable: `at.targets` +# +# It's a well-known secret that many files generated by a Makefile vary with +# the values of particular variables, but that GNU Make can't track these +# dependencies. Well, with some cleverness, it actually can! +# +# With this module, to depend on the value of a variable, depend on +# `$(outdir)/.var.VARNAME`. +endef .PHONY: _var.FORCE |