Document -gcc-base-dir in sparse.1

Signed-off-by: Alexey zaytsev <alexey.zaytsev@gmail.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/sparse.1 b/sparse.1
index d242dc75..92a1caeb 100644
--- a/sparse.1
+++ b/sparse.1
@@ -287,6 +287,11 @@ However, this behavior can lead to subtle errors.
 
 Sparse does not issue these warnings by default.
 .
+.SH MISC OPTIONS
+.TP
+.B \-gcc-base-dir \fIdir\fR
+Look for compiler-provided system headers in \fIdir\fR/include/ and \fIdir\fR/include-fixed/.
+.
 .SH SEE ALSO
 .BR cgcc (1)
 .