diff options
Diffstat (limited to 'doc/make.texi')
| -rw-r--r-- | doc/make.texi | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/doc/make.texi b/doc/make.texi index 4ef1107..2389ca0 100644 --- a/doc/make.texi +++ b/doc/make.texi @@ -3747,6 +3747,10 @@ unexport @var{variable} @dots{} @end example @noindent +In both of these forms, the arguments to @code{export} and +@code{unexport} are expanded, and so could be variables or functions +which expand to a (list of) variable names to be (un)exported. + As a convenience, you can define a variable and export it at the same time by doing: @@ -5434,7 +5438,9 @@ effective; otherwise, the @var{text-if-false}, if any, is effective. If the variable @var{variable-name} has a non-empty value, the @var{text-if-true} is effective; otherwise, the @var{text-if-false}, if any, is effective. Variables that have never been defined have an -empty value. +empty value. The variable @var{variable-name} is itself expanded, so +it could be a variable or function that expands to the name of a +variable. Note that @code{ifdef} only tests whether a variable has a value. It does not expand the variable to see if that value is nonempty. |