38c32400f5
An `extern LIB "csym"` ref must name a declared #library / #import c unit, like its `#foreign LIB` twin (example 1620). Today checkForeignRefs reads only foreign_expr.library_ref and skips the extern keyword's extern_lib, so a bogus `extern nosuchunit "abs"` compiles silently (the symbol resolves via the default image and runs). Expected pins the DESIRED compile-time diagnostic; the next commit extends checkForeignRefs to green it. Fourth extern/#foreign divergence and a prerequisite for the fn-decl migration. 647 corpus (1231 xfail), 444 unit.
20 lines
861 B
Plaintext
20 lines
861 B
Plaintext
// An `extern LIB "csym"` reference must name something real, exactly like
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// its `#foreign LIB` twin (example 1620): `nosuchunit` names neither a
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// #library constant nor a named `#import c` unit, so this is a compile-time
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// diagnostic — the bogus library reference is caught BEFORE the symbol
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// would silently resolve through whatever image happens to carry it.
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//
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// Regression (FFI-linkage Part B): `checkForeignRefs` validated only a
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// `#foreign` (foreign_expr) library_ref and skipped the `extern` keyword's
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// `extern_lib`, so a bogus `extern` lib reference compiled silently (the
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// symbol resolved via the default image and ran). Prerequisite for
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// migrating the fn-decl `#foreign` path onto `extern`.
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#import "modules/std.sx";
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c_abs :: (n: i32) -> i32 extern nosuchunit "abs";
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main :: () -> i32 {
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print("c_abs = {}\n", c_abs(-5));
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0
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}
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