mirrors/make
1
0
Fork 0
mirror of https://git.savannah.gnu.org/git/make.git synced 2024-10-24 05:09:58 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

* doc/make.tex (Substitution Refs): Clarify patsubst relationship.

Browse source
This commit is contained in:
Paul Smith 2019-09-03 16:28:36 -04:00
parent ba950a796a
commit 0967624050
1 changed files with 10 additions and 8 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

18
doc/make.texi
View file

@ -5523,17 +5523,19 @@ replaced; other occurrences of @var{a} in the value are unaltered. For
example:@refill
@example
foo := a.o b.o c.o
foo := a.o b.o l.a c.o
bar := $(foo:.o=.c)
@end example
@noindent
sets @samp{bar} to @samp{a.c b.c c.c}. @xref{Setting, ,Setting Variables}.
sets @samp{bar} to @samp{a.c b.c l.a c.c}. @xref{Setting, ,Setting Variables}.
A substitution reference is actually an abbreviation for use of the
@code{patsubst} expansion function (@pxref{Text Functions, ,Functions for String Substitution and Analysis}). We provide
substitution references as well as @code{patsubst} for compatibility with
other implementations of @code{make}.
A substitution reference is shorthand for the @code{patsubst}
expansion function (@pxref{Text Functions, ,Functions for String Substitution and Analysis}):
@samp{$(@var{var}:@var{a}=@var{b})} is equivalent to
@samp{$(patsubst %@var{a},%@var{b},@var{var})}. We provide
substitution references as well as @code{patsubst} for compatibility
with other implementations of @code{make}.
@findex patsubst
Another type of substitution reference lets you use the full power of
@ -5548,13 +5550,13 @@ for a description of the @code{patsubst} function.@refill
@group
@exdent For example:
foo := a.o b.o c.o
foo := a.o b.o l.a c.o
bar := $(foo:%.o=%.c)
@end group
@end example
@noindent
sets @samp{bar} to @samp{a.c b.c c.c}.
sets @samp{bar} to @samp{a.c b.c l.a c.c}.
@node Computed Names, , Substitution Refs, Advanced
@subsection Computed Variable Names