Steven Wu c3550e81ce [Dependency Scan] Do not pass clang's -dwarf-debug-flags to swift ...

When turning on directCC1 scanning, swift will ask clang driver to
expand all cc1 flags and pass that explicitly on command-line. In such
case, if `RC_DEBUG_OPTIONS` env is set on darwin platform, it will cause
clang driver to encode all the options it gets and pass those clang
driver options as a cc1 options `-dwarf-debug-flags`.

After the change, swift scanner will no longer generate a long
`-Xcc -dwarf-debug-flag -Xcc <long list of flags>` for later
compilation. Losing such information in DWARF doesn't affect swift
debugging. It will instead, make command-line a lot shorter, save spaces
in swift binary module, and make swift caching build more reliable.

rdar://144267483

2025-02-05 16:37:00 -08:00

1.8 KiB

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