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llvm-project/clang/test/Driver/lto-jobs.c

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[LTO] Add -flto-jobs=N to control backend parallelism Summary: Currently, a linker option must be used to control the backend parallelism of ThinLTO. The linker option varies depending on the linker (e.g. gold vs ld64). Add a new clang option -flto-jobs=N to control this. I've added in the wiring to pass this to the gold plugin. I also added in the logic to pass this down in the form I understand that ld64 uses on MacOS, for the darwin target. Reviewers: mehdi_amini, dexonsmith Subscribers: mehdi_amini, cfe-commits Differential Revision: https://reviews.llvm.org/D24826 llvm-svn: 282291
2016-09-24 04:38:09 +08:00
// Confirm that -flto-jobs=N is passed to linker
// RUN: %clang -target x86_64-unknown-linux -### %s -flto=thin -flto-jobs=5 2> %t
// RUN: FileCheck -check-prefix=CHECK-LINK-THIN-JOBS-ACTION < %t %s
//
// CHECK-LINK-THIN-JOBS-ACTION: "-plugin-opt=jobs=5"
// RUN: %clang -target x86_64-apple-darwin13.3.0 -### %s -flto=thin -flto-jobs=5 2> %t
// RUN: FileCheck -check-prefix=CHECK-LINK-THIN-JOBS2-ACTION < %t %s
//
After 09158252f777c2e2f06a86b154c44abcbcf9bb74, fix build when -DLLVM_ENABLE_THREADS=OFF Tested on Linux with Clang 9, and on Windows with Visual Studio 2019 16.5.1 with -DLLVM_ENABLE_THREADS=ON and OFF.
2020-03-29 01:54:44 +08:00
// CHECK-LINK-THIN-JOBS2-ACTION: "-mllvm" "-threads={{[0-9]+}}"