cmd/compile: document -trimpath

Fixes #8999.

Change-Id: I1390605bdf908f59b596975ea51eb04bd03bbae0
Reviewed-on: https://go-review.googlesource.com/16918
Reviewed-by: Ian Lance Taylor <iant@golang.org>

diff --git a/src/cmd/compile/doc.go b/src/cmd/compile/doc.go
index f70c1cf6d46453d58d7797996e300d4c5d5b163f..2b45e5b998bc1065f0081b40dff0795ebe796123 100644 (file)
--- a/src/cmd/compile/doc.go
+++ b/src/cmd/compile/doc.go
@@ -79,6 +79,8 @@ Flags:
                Write a package (archive) file rather than an object file
        -race
                Compile with race detector enabled.
+       -trimpath prefix
+               Remove prefix from recorded source file paths.
        -u
                Disallow importing packages not marked as safe; implies -nolocalimports.