diff options
Diffstat (limited to 'doc')
-rw-r--r-- | doc/make.texi | 62 |
1 files changed, 43 insertions, 19 deletions
diff --git a/doc/make.texi b/doc/make.texi index e694068..a31c3ad 100644 --- a/doc/make.texi +++ b/doc/make.texi @@ -1239,11 +1239,11 @@ If a makefile named @code{Makefile} has this content: @example @group -name1 := $(word $(words $(MAKEFILE_LIST)),$(MAKEFILE_LIST)) +name1 := $(lastword $(MAKEFILE_LIST)) include inc.mk -name2 := $(word $(words $(MAKEFILE_LIST)),$(MAKEFILE_LIST)) +name2 := $(lastword $(MAKEFILE_LIST)) all: @@echo name1 = $(name1) @@ -5963,8 +5963,28 @@ $(firstword foo bar) produces the result @samp{foo}. Although @code{$(firstword @var{text})} is the same as @code{$(word 1,@var{text})}, the @code{firstword} function is retained for its simplicity.@refill + + +@item $(lastword @var{names}@dots{}) +@findex lastword +@cindex words, extracting last +The argument @var{names} is regarded as a series of names, separated +by whitespace. The value is the last name in the series. + +For example, + +@example +$(lastword foo bar) +@end example + +@noindent +produces the result @samp{bar}. Although @code{$(lastword +@var{text})} is the same as @code{$(word $(words @var{text}),@var{text})}, +the @code{lastword} function was added for its simplicity and better +performance.@refill @end table + Here is a realistic example of the use of @code{subst} and @code{patsubst}. Suppose that a makefile uses the @code{VPATH} variable to specify a list of directories that @code{make} should search for @@ -9636,7 +9656,7 @@ Remove all search paths previously specified in any @code{vpath} directive. @end table -Here is a summary of the text manipulation functions (@pxref{Functions}): +Here is a summary of the built-in functions (@pxref{Functions}): @table @code @item $(subst @var{from},@var{to},@var{text}) @@ -9667,6 +9687,26 @@ Select words in @var{text} that @emph{do not} match any of the @var{pattern} wor Sort the words in @var{list} lexicographically, removing duplicates.@* @xref{Text Functions, , Functions for String Substitution and Analysis}. +@item $(word @var{n},@var{text}) +Extract the @var{n}th word (one-origin) of @var{text}.@* +@xref{Text Functions, , Functions for String Substitution and Analysis}. + +@item $(words @var{text}) +Count the number of words in @var{text}.@* +@xref{Text Functions, , Functions for String Substitution and Analysis}. + +@item $(wordlist @var{s},@var{e},@var{text}) +Returns the list of words in @var{text} from @var{s} to @var{e}.@* +@xref{Text Functions, , Functions for String Substitution and Analysis}. + +@item $(firstword @var{names}@dots{}) +Extract the first word of @var{names}.@* +@xref{Text Functions, , Functions for String Substitution and Analysis}. + +@item $(lastword @var{names}@dots{}) +Extract the last word of @var{names}.@* +@xref{Text Functions, , Functions for String Substitution and Analysis}. + @item $(dir @var{names}@dots{}) Extract the directory part of each file name.@* @xref{File Name Functions, ,Functions for File Names}. @@ -9695,22 +9735,6 @@ Prepend @var{prefix} to each word in @var{names}.@* Join two parallel lists of words.@* @xref{File Name Functions, ,Functions for File Names}. -@item $(word @var{n},@var{text}) -Extract the @var{n}th word (one-origin) of @var{text}.@* -@xref{File Name Functions, ,Functions for File Names}. - -@item $(words @var{text}) -Count the number of words in @var{text}.@* -@xref{File Name Functions, ,Functions for File Names}. - -@item $(wordlist @var{s},@var{e},@var{text}) -Returns the list of words in @var{text} from @var{s} to @var{e}.@* -@xref{File Name Functions, ,Functions for File Names}. - -@item $(firstword @var{names}@dots{}) -Extract the first word of @var{names}.@* -@xref{File Name Functions, ,Functions for File Names}. - @item $(wildcard @var{pattern}@dots{}) Find file names matching a shell file name pattern (@emph{not} a @samp{%} pattern).@* |