add precompiled c/c++ header support to zig build#17956

Draft

xxxbxxx wants to merge 8 commits intoziglang:masterfrom xxxbxxx:pch-support

+821-84

Commits on Dec 19, 2024

std.Build: add an option to CSourceFile to override the language detection.
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test: add a standalone test case to test mixing several languages and options in a single compile step.
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std.Build: merge .assembly_file, .c_source_file, .c_source_files cases in Compile step
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zig: add build-pch command to emit a precompiled C header.
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std.Build: add precompiled C header creation
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std.Build: add an option to addCSourceFiles() to include a precompiled header file.
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std.Build: Add a finalize function to Build.Steps
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std.Build: precompiled_header option can now directly be a headerfile.
xxxbxxx
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