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With this patch, the clang tool will now call the -cc1 invocation directly inside the same process. Previously, the -cc1 invocation was creating, and waiting for, a new process. This patch therefore reduces the number of created processes during a build, thus it reduces build times on platforms where process creation can be costly (Windows) and/or impacted by a antivirus. It also makes debugging a bit easier, as there's no need to attach to the secondary -cc1 process anymore, breakpoints will be hit inside the same process. Crashes or signaling inside the -cc1 invocation will have the same side-effect as before, and will be reported through the same means. This behavior can be controlled at compile-time through the CLANG_SPAWN_CC1 cmake flag, which defaults to OFF. Setting it to ON will revert to the previous behavior, where any -cc1 invocation will create/fork a secondary process. At run-time, it is also possible to tweak the CLANG_SPAWN_CC1 environment variable. Setting it and will override the compile-time setting. A value of 0 calls -cc1 inside the calling process; a value of 1 will create a secondary process, as before. Differential Revision: https://reviews.llvm.org/D69825
5 lines
232 B
C
5 lines
232 B
C
// RUN: env -u CLANG_SPAWN_CC1 %clang -c %s -o /dev/null
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// RUN: env CLANG_SPAWN_CC1=0 %clang -c %s -o /dev/null
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// RUN: env CLANG_SPAWN_CC1=1 %clang -c %s -o /dev/null
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// RUN: env CLANG_SPAWN_CC1=test not %clang -c %s -o /dev/null
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