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use DYLD_FALLBACK_LIBRARY_PATH for dylib_path_envvar on macOS #6355

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merged 1 commit into from
Jan 2, 2019
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use DYLD_FALLBACK_LIBRARY_PATH for dylib_path_envvar on macOS #6355

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13 changes: 12 additions & 1 deletion src/cargo/util/paths.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -34,7 +34,18 @@ pub fn dylib_path_envvar() -> &'static str {
if cfg!(windows) {
"PATH"
} else if cfg!(target_os = "macos") {
"DYLD_LIBRARY_PATH"
// When loading and linking a dynamic library or bundle, dlopen
// searches in LD_LIBRARY_PATH, DYLD_LIBRARY_PATH, PWD, and
// DYLD_FALLBACK_LIBRARY_PATH.
// In the Mach-O format, a dynamic library has an "install path."
// Clients linking against the library record this path, and the
// dynamic linker, dyld, uses it to locate the library.
// dyld searches DYLD_LIBRARY_PATH *before* the install path.
// dyld searches DYLD_FALLBACK_LIBRARY_PATH only if it cannot
// find the library in the install path.
// Setting DYLD_LIBRARY_PATH can easily have unintended
// consequences.
"DYLD_FALLBACK_LIBRARY_PATH"
} else {
"LD_LIBRARY_PATH"
}
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