diff options
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 |