c-incpath.c (add_sysroot_to_chain): New.

	* c-incpath.c (add_sysroot_to_chain): New.
	(merge_include_chains): Add sysroot argument.  Call
	add_sysroot_to_chain if sysrooted.
	(register_include_chains): Update call to merge_include_chains.
	* doc/cppopts.texi: Document use of '=' in include directory
	arguments.

From-SVN: r123134

1 files changed, 8 insertions, 0 deletions

diff --git a/gcc/doc/cppopts.texi b/gcc/doc/cppopts.texi
index fbd6f80790a..17235bdae58 100644
--- a/gcc/doc/cppopts.texi
+++ b/gcc/doc/cppopts.texi
@@ -65,6 +65,8 @@ of system headers are not defeated
 (@pxref{System Headers})
 @end ifset
 .
+If @var{dir} begins with @code{=}, then the @code{=} will be replaced
+by the sysroot prefix; see @option{--sysroot} and @option{-isysroot}.
 
 @item -o @var{file}
 @opindex o
@@ -464,6 +466,8 @@ specified by @option{-include}.
 Search @var{dir} for header files, but do it @emph{after} all
 directories specified with @option{-I} and the standard system directories
 have been exhausted.  @var{dir} is treated as a system include directory.
+If @var{dir} begins with @code{=}, then the @code{=} will be replaced
+by the sysroot prefix; see @option{--sysroot} and @option{-isysroot}.
 
 @item -iprefix @var{prefix}
 @opindex iprefix
@@ -499,6 +503,8 @@ is applied to the standard system directories.
 @ifset cppmanual
 @xref{System Headers}.
 @end ifset
+If @var{dir} begins with @code{=}, then the @code{=} will be replaced
+by the sysroot prefix; see @option{--sysroot} and @option{-isysroot}.
 
 @item -iquote @var{dir}
 @opindex iquote
@@ -509,6 +515,8 @@ Search @var{dir} only for header files requested with
 @ifset cppmanual
 @xref{Search Path}.
 @end ifset
+If @var{dir} begins with @code{=}, then the @code{=} will be replaced
+by the sysroot prefix; see @option{--sysroot} and @option{-isysroot}.
 
 @item -fdollars-in-identifiers
 @opindex fdollars-in-identifiers