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feat: emcc C compiles go through the object cache

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compileCWithEmcc now probes/saves .sx-cache/c-<key>.o with the same
content key as the native path (source + declared headers + transitive
deps + defines/flags/incdirs), keyed by the emcc --version line and the
wasm triple so emsdk upgrades and wasm32/64 variants never collide with
each other or with native objects. Cache hits hand the linker the cache
path directly. objectMagicOk accepts the wasm magic. Verified: warm
wasm build of a c-unit drops 1.85s -> 0.61s (emcc -c skipped).
This commit is contained in:
agra
2026-06-12 18:52:43 +03:00
parent 4b9324e585
commit 6114b51073
2 changed files with 73 additions and 6 deletions
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src/c_import.test.zig
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@@ -70,6 +70,7 @@ test "objectMagicOk: accepts Mach-O and ELF, rejects garbage and truncation" {
try std.testing.expect(c_import.objectMagicOk(&.{ 0xcf, 0xfa, 0xed, 0xfe, 0x00 })); // Mach-O 64
try std.testing.expect(c_import.objectMagicOk(&.{ 0xce, 0xfa, 0xed, 0xfe })); // Mach-O 32
try std.testing.expect(c_import.objectMagicOk(&.{ 0x7f, 'E', 'L', 'F', 0x02 }));
try std.testing.expect(c_import.objectMagicOk(&.{ 0x00, 'a', 's', 'm', 0x01 })); // wasm
try std.testing.expect(!c_import.objectMagicOk("not an object file"));
try std.testing.expect(!c_import.objectMagicOk(&.{ 0xcf, 0xfa, 0xed })); // truncated magic
try std.testing.expect(!c_import.objectMagicOk(&.{}));