If DDC is invoked with an relative output path during the Dart SDK build
itself rather than an absolute path, then the build will fail with an
error message that it can't calculate the relative path between the
output file and the source map. The problem is that p.url.relative
cannot be used with real relative filesystem paths as the current
directory is assumed to be the string '.' rather than the actual
directory and the algorithm cannot perform the resolution.
This change blocks the RBE dart action offloading in a follow up change,
which changes the Dart SDK build to only use relative paths when
building on RBE, which otherwise fails in the above manner.
Fixes: b/333765428
Change-Id: I5f3d984337cdd006feeb6b721f21fa17ed0d23f5
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/362189
Reviewed-by: Nicholas Shahan <nshahan@google.com>
Auto-Submit: Jonas Termansen <sortie@google.com>
Commit-Queue: Jonas Termansen <sortie@google.com>
Jonas Termansen
936b3a2ccf