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Nathan Hawes 0a4204e99f [Driver] Add -driver-filelist-threshold to set the number of inputs beyond which filelists are used

When generating a compiler invocation in driver::createCompilerInvocation()
we end up using filelists if the number of inputs is > 128 (to work around
command line arg limits). We never actually write them out though, and so
fail when parsing the frontend arguments that reference them.

As this function is called frequently by SourceKit and command line limits
aren't a concern here, this patch makes the 128 threshold value configurable
via a new -driver-filelist-threshold option. This is set to its maximum value
in driver::createCompilerInvocation() to ensure filelists aren't used. This
new option makes the existing -driver-use-filelists (that forces filelists to
be used) redundant as it's now equivalent to -driver-filelist-threshold=0.

Resolves rdar://problem/38231888

2018-04-12 05:24:03 -07:00

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 let x = 10
 x.
 // RUN: %sourcekitd-test -req=complete -pos=2:3 %s -- -driver-filelist-threshold=0 %s | %FileCheck %s -check-prefix=COMPLETE
 // COMPLETE: littleEndian