Summary:
lld-link allows the number of parallel ThinLTO jobs to be specified
using /opt:lldltojobs=N. If left unspecified, the implementation
conservatively defaults to 1. This leads to very long link times. This
change makes it so that the default is to automatically set the
parallelism, as we do in the ELF linker.
Reviewers: ruiu, hans
Reviewed By: ruiu, hans
Subscribers: pcc, mehdi_amini, Prazek, llvm-commits
Differential Revision: https://reviews.llvm.org/D31986
llvm-svn: 300089
unsigned LTOOptLevel = 2;
// Used for /opt:lldltojobs=N
- unsigned LTOJobs = 1;
+ unsigned LTOJobs = 0;
// Used for /opt:lldltopartitions=N
unsigned LTOPartitions = 1;
checkError(Conf.addSaveTemps(std::string(Config->OutputFile) + ".",
/*UseInputModulePath*/ true));
lto::ThinBackend Backend;
- if (Config->LTOJobs != -1u)
+ if (Config->LTOJobs != 0)
Backend = lto::createInProcessThinBackend(Config->LTOJobs);
return llvm::make_unique<lto::LTO>(std::move(Conf), Backend,
Config->LTOPartitions);