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PGO: Check that pgo-use file actually exists. LLVM seems to only emit an easy-to-overlook warning otherwise.

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Michael Woerister 2019-05-22 13:00:09 +02:00
parent e943426045
commit eeb7348dc3
1 changed files with 9 additions and 0 deletions
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9
src/librustc/session/mod.rs
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@ -1272,6 +1272,15 @@ fn validate_commandline_args_with_session_available(sess: &Session) {
sess.err("Linker plugin based LTO is not supported together with \ sess.err("Linker plugin based LTO is not supported together with \
`-C prefer-dynamic` when targeting MSVC"); `-C prefer-dynamic` when targeting MSVC");
} }
// Make sure that any given profiling data actually exists so LLVM can't
// decide to silently skip PGO.
if let Some(ref path) = sess.opts.debugging_opts.pgo_use {
if !path.exists() {
sess.err(&format!("File `{}` passed to `-Zpgo-use` does not exist.",
path.display()));
}
}
} }
/// Hash value constructed out of all the `-C metadata` arguments passed to the /// Hash value constructed out of all the `-C metadata` arguments passed to the