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Pass system header paths to fallback parser #3440

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Pass system header paths to fallback parser #3440

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2 changes: 2 additions & 0 deletions bindgen-tests/tests/expectations/tests/macro-fallback-include-builtin.rs
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7 changes: 7 additions & 0 deletions bindgen-tests/tests/headers/macro-fallback-include-builtin.h
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Original file line number Diff line number Diff line change
@@ -0,0 +1,7 @@
// bindgen-flags: --clang-macro-fallback --allowlist-item TEST
// Ensures that the fallback path for macros doesn't silently
// fail because of builtin headers not being found.

#include <stddef.h>

#define TEST ((size_t)42)
5 changes: 4 additions & 1 deletion bindgen/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -871,7 +871,10 @@ impl Bindings {
for path in search_paths {
if let Ok(path) = path.into_os_string().into_string() {
options.clang_args.push("-isystem".into());
options.clang_args.push(path.into_boxed_str());
options.clang_args.push(path.clone().into_boxed_str());

options.fallback_clang_args.push("-isystem".into());
options.fallback_clang_args.push(path.into_boxed_str());
}
}
}
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