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[Serialization] Move loading swiftmodule files as volatile behind a flag

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Introduce a new frontend flag -enable-volatile-modules to trigger
loading swiftmodule files as volatile and avoid using mmap. Revert the
default behavior to using mmap.
This commit is contained in:
Alexis Laferrière
2020-07-22 11:22:06 -07:00
parent 0ede7282bb
commit 2c66f0c75d
4 changed files with 12 additions and 2 deletions
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2
lib/Frontend/CompilerInvocation.cpp
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@@ -599,6 +599,8 @@ static bool ParseLangArgs(LangOptions &Opts, ArgList &Args,
Opts.VerifyAllSubstitutionMaps |= Args.hasArg(OPT_verify_all_substitution_maps);
Opts.EnableVolatileModules |= Args.hasArg(OPT_enable_volatile_modules);
Opts.UseDarwinPreStableABIBit =
(Target.isMacOSX() && Target.isMacOSXVersionLT(10, 14, 4)) ||
(Target.isiOS() && Target.isOSVersionLT(12, 2)) ||