On 10/25/2017 06:26 PM, Jim Wilson wrote:
Index: gcc/doc/invoke.texi
===================================================================
--- gcc/doc/invoke.texi (revision 254023)
+++ gcc/doc/invoke.texi (working copy)
@@ -6981,7 +6981,12 @@ link processing time. Merging is enabled by defau
@item -fdebug-prefix-map=@var{old}=@var{new}
@opindex fdebug-prefix-map
When compiling files in directory @file{@var{old}}, record debugging
-information describing them as in @file{@var{new}} instead.
+information describing them as in @file{@var{new}} instead. This can be
+used to replace a build time path with an install time path in the debug info.
build-time path, install-time path
+It can also be used to change an absolute path to a relative path by using
+@file{.} for @var{new}. This can give more reproducible builds, which are
+location independent, but may require an extra command to tell gdb where to
+find the source files.
@item -fvar-tracking
@opindex fvar-tracking
OK with that tweak to the hyphenation.
-Sandra
