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* doc/make.texi (Pattern Rules): Clarify that rules must have recipes.

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Paul Smith 2024-03-28 19:08:20 -04:00
parent 61ee4578f5
commit 033330e34c
1 changed files with 7 additions and 2 deletions
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@ -10716,8 +10716,13 @@ pattern for matching file names; the @samp{%} can match any nonempty
substring, while other characters match only themselves. The prerequisites
likewise use @samp{%} to show how their names relate to the target name.
Thus, a pattern rule @samp{%.o : %.c} says how to make any file
@file{@var{stem}.o} from another file @file{@var{stem}.c}.
Thus, a pattern rule @samp{%.o : %.c ; @var{recipe}} describes a process for
building any file @file{@var{stem}.o} from another file @file{@var{stem}.c}
using the recipe @var{recipe}.
It is not possible to create a pattern rule that does not have a recipe;
omitting the recipe removes that pattern rule instead (@pxref{Canceling Rules,
,Canceling Implicit Rules}).
Note that expansion using @samp{%} in pattern rules occurs
@strong{after} any variable or function expansions, which take place