diff options
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/make.texi | 22 |
1 files changed, 10 insertions, 12 deletions
diff --git a/doc/make.texi b/doc/make.texi index 085e9c24..49cdb0b2 100644 --- a/doc/make.texi +++ b/doc/make.texi @@ -1703,18 +1703,16 @@ this second expansion to occur, the special target @code{.SECONDEXPANSION} must be defined before the first prerequisite list that makes use of this feature. -If that special target is defined then in between the two phases -mentioned above, right at the end of the read-in phase, all the -prerequisites of the targets defined after the special target are -expanded a @emph{second time}. In most circumstances this secondary -expansion will have no effect, since all variable and function -references will have been expanded during the initial parsing of the -makefiles. In order to take advantage of the secondary expansion -phase of the parser, then, it's necessary to @emph{escape} the -variable or function reference in the makefile. In this case the -first expansion merely un-escapes the reference but doesn't expand it, -and expansion is left to the secondary expansion phase. For example, -consider this makefile: +If @code{.SECONDEXPANSION} is defined then when GNU @code{make} needs to check +the prerequisites of a target, the prerequisites are expanded a @emph{second +time}. In most circumstances this secondary expansion will have no effect, +since all variable and function references will have been expanded during the +initial parsing of the makefiles. In order to take advantage of the secondary +expansion phase of the parser, then, it's necessary to @emph{escape} the +variable or function reference in the makefile. In this case the first +expansion merely un-escapes the reference but doesn't expand it, and expansion +is left to the secondary expansion phase. For example, consider this +makefile: @example .SECONDEXPANSION: |