[cmake] Run normal compiler auto-detection by default #23537
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This change disables `EMSCRIPTEN_FORCE_COMPILERS` by default which means cmake will run all the normal compiler detection phases. This has the advantage that things get setup correctly without taking any shortcuts. See emscripten-core#23444. The downside is the that cmake phase itself is now slower since its needs to compiler, link and run a bunch of test binaries. On my machine running all the cmake tests went from 27 to 36 seconds. Running a single empty cmake project when from 1s to 4.5s. Since running cmake is normally rare compared to building the project itself I think this slowdown is worth it, but I've left the `EMSCRIPTEN_FORCE_COMPILERS` setting in place for now that folks that want fast cmake. Also, remember that cmake itself caches all this stuff so its only the first run that get slowed down.
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dschuff
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Jan 29, 2025
kripken
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Jan 30, 2025
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This change disables
EMSCRIPTEN_FORCE_COMPILERSby default which means cmake will run all the normal compiler detection phases. This has the advantage that things get setup correctly without taking any shortcuts. See #23444.The downside is the that cmake phase itself is now slower since its needs to compiler, link and run a bunch of test binaries.
On my machine running all the cmake tests went from 27 to 36 seconds. Running a single empty cmake project when from 1s to 4.5s. Since running cmake is normally rare compared to building the project itself I think this slowdown is worth it, but I've left the
EMSCRIPTEN_FORCE_COMPILERSsetting in place for now that folks that want fast cmake.Also, remember that cmake itself caches all this stuff so its only the first run that get slowed down.