This should enable scaling when using machines with large amount of
RAM.
To better support machines with lower spec, process one binary per
dsymutil invocation (reverting #34149).
Add some (limited) facilities to gather the time taken to execute
dsymutil to better assist in tuning the parameter -- these are printed in
JSON format in the log to allow for easier scraping
```
{ "command": "dsymutil", "start": "2020-11-18T18:10:47" }
{ "command": "dsymutil", "end": "2020-11-18T18:14:45" }
```
Addresses rdar://71018443
This causes build-script to use the conservative dependency information that I
committed. When one uses this option, it is assumed that one wants to also
install all built products.
Some notes:
1. I included an extra --install-all option so without --infer enabled
one can enable this sort of install everything that we want to
build behavior.
2. I added %cmake as a lit variable. I did this so I could specify in
my build-system unit tests that on Linux they should use the just
built cmake (if we built cmake due to an old cmake being on the
system). Otherwise, the build system unit tests took way too
long. These are meant to be dry-runs, so building this cmake again
is just wasteful and doesn't make sense.
3. I unified how we handle cmark, llvm, swift with the rest of the
build products by making them conditional on build_* variables, but
to preserve current behavior I made it so that they are just
enabled by default unlike things like
llbuild/swiftpm/foundation/etc. This was necessary since previously
we would just pass these flags to build-script-impl and
build-script didn't know about them. Now I taught build-script
about them so I can manipulate these skip-build-{cmark,llvm,swift}
and then just pass them down to build-script-impl if appropriate
rather than relying on build-script-impl to control if these are
built.
Once this lands, I think we are at a good enough place with
build-script until we get rid of build-script-impl in terms of high
value QoI that will imnprove productivity. Once build-script-impl is
destroyed, we can start paring back what build-script itself does.
* Revert "[strip -ST] Disable runtime stack trace dumping on Darwin when asserts are disabled."
This reverts commit 6bc28ff1c9.
* Bring back important fixes from the revert of 6bc28ff1c9.
* Change swift::swift_reportError to only print the backtrace in assert builds (swift::warning prints backtrace always).
This commit disables runtime stack trace dumping via dladdr on Darwin when
asserts are disabled.
This stack trace dumping was added as a way to improve the ability to debug the
compiler for compiler developers. This is all well and good but having such a
feature always enabled prevents us from reducing the size of the swift standard
library by eliminating the swift nlist.
rdar://31372220
This creates a nice stub for further sorts of lit based build system unit tests,
such as for making sure that debug info is emitted in the correct places.
