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Diffstat (limited to 'gcc/doc/invoke.texi')
| -rw-r--r-- | gcc/doc/invoke.texi | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index a6bcd721cf3..ccd6a54dd92 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -7415,6 +7415,19 @@ of the current spec. The following built-in spec functions are provided: @table @code +@item @code{getenv} +The @code{getenv} spec function takes two arguments: an environment +variable name and a string. If the environment variable is not +defined, a fatal error is issued. Otherwise, the return value is the +value of the environment variable concatenated with the string. For +example, if @env{TOPDIR} is defined as @file{/path/to/top}, then: + +@smallexample +%:getenv(TOPDIR /include) +@end smallexample + +expands to @file{/path/to/top/include}. + @item @code{if-exists} The @code{if-exists} spec function takes one argument, an absolute pathname to a file. If the file exists, @code{if-exists} returns the |