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perf: build external cmake deps in parallel #21

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jorijnvdgraaf merged 1 commit from claude/issue-20 into master 2026-06-02 01:23:40 +02:00
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1 changed files with 7 additions and 1 deletions
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8
implementations/Crafter.Build-External.cpp
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@ -210,7 +210,13 @@ std::string ConfigureCMake(const fs::path& cloneDir, const fs::path& cmakeBuildD
}
std::string BuildCMake(const fs::path& cmakeBuildDir) {
std::string cmd = std::format("cmake --build {}", ShellQuote(fs::absolute(cmakeBuildDir).string()));
// Without --parallel, the Unix Makefiles generator builds one translation
// unit at a time, leaving every core but one idle. Pass an explicit job
// count (a bare --parallel maps to an unbounded `make -j` fork bomb on the
// Makefiles generator) so deps like DPP/msquic/glslang compile ~N× faster.
unsigned jobs = std::max(1u, std::thread::hardware_concurrency());
std::string cmd = std::format("cmake --build {} --parallel {}",
ShellQuote(fs::absolute(cmakeBuildDir).string()), jobs);
CommandResult r = RunCommandChecked(cmd);
if (r.exitCode != 0) {
return std::format("cmake --build failed (exit {}): {}", r.exitCode, r.output);