On 20/09/2023 11:58, Christian Franke via Cygwin-apps wrote:
Brian Inglis wrote:
On 2023-09-18 04:41, Christian Franke via Cygwin-apps wrote:
Brian Inglis wrote:
On 2023-09-17 08:01, Jon Turney via Cygwin-apps wrote:
On 16/09/2023 15:17, Christian Franke via Cygwin wrote:
Found during tests of busybox package:
If the path of the top build directory contains a symlink and the
project's build scripts normalize pathnames, no debug info is
created by cygport.
This is because options like
-fdebug-prefix-map=${B}=/usr/src/debug/${PF}
have no effect because ${B} contains a symlink but the compiler is
run with the real source path.
I think that there was some historical bug with gcc where a
relative path for the old path in this mapping wasn't correctly
handled, which is why were using an absolute path here at all.
So changing it to something like [1] (if that works), might be better.
[1]
https://github.com/jon-turney/cygport/commit/4175d456a9184c5cdebd8bfb4b5ba30583cedd66
Should bin/cygport.in:534: not have $B between the == as in line 531:
declare ${flags}+=" -fdebug-prefix-map=${B}=/usr/src/debug/${PF}"
...
declare ${flags}+=" -fdebug-prefix-map==/usr/src/debug/${PF}"
or be hoist above the condition if identical, unless that is some
undocumented default for cwd?
I guess the == without ${B} is intentional because it makes the debug
source path relative to ${B} as lines 535-536 also do.
Yeah, I think that "==" is shorthand for "=.=", i.e. relative to cwd.
Does using relative paths in the prefix-map resolve the original issue
seen with busybox?
(It's unclear to me how gcc compares paths to apply this mapping. If
it's a literal string prefix, rather than on some (semi-)canonicalized
path, then we're maybe going to lose here sometimes, depending on the
vagaries of the build-system, unless we list all of relative, absolute,
and canonical absolute paths?)
(But then maybe we can push dealing with or indicating which of those is
correct off onto the individual cygport?)
