[PATCH] allow empty string as argument to -Map

	* lexsup.c (parse_args): If the map filename is defined but empty
	create a name based upon the output file name.  If the name is
	defined but refers to a directory create a file inside the
	directory based on the output file name.
	* ld.texi: Document the new feature.
	* testsuite/ld-script/map-address.exp: Add test of new feature.
	* NEWS: Mention the new feature.

1 files changed, 6 insertions, 1 deletions

diff --git a/ld/ld.texi b/ld/ld.texi
index a7ec0d0..5234252 100644
--- a/ld/ld.texi
+++ b/ld/ld.texi
@@ -1760,7 +1760,12 @@ Print a summary of all target-specific options on the standard output and exit.
 @kindex -Map=@var{mapfile}
 @item -Map=@var{mapfile}
 Print a link map to the file @var{mapfile}.  See the description of the
-@option{-M} option, above.
+@option{-M} option, above.  Specifying the empty string as @var{mapfile}
+(that is, @code{-Map=}) causes the link map to be written to a file
+named after the @var{output} file, with @code{.map} appended.
+Specifying a directory as @var{mapfile} causes the link map to be
+written into a file inside the directory.  The name of the file is
+again based upon the @var{output} filename with @code{.map} appended.
 
 @cindex memory usage
 @kindex --no-keep-memory