jyknight added a comment.
I think the diagnosis on the original issue was incorrect.
It seems to me that it was caused by the prefix being set as "/bin" instead of
"/usr/bin", because clang _doesn't_ actually canonicalize its prefix, even when
-no-canonical-prefixes isn't specified! All it does, now, is to make the prefix
absolute -- without fully canonicalizing. I think that's simply a bug.
If the prefix had been, properly, /usr/bin, then the include path would've been:
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/7.2.0/../../../../include/c++/7.2.0/iostream
And in that case, it would've worked properly with ninja, without adding the
feature in this patch.
Reference clang/tools/driver/driver.cpp:297:
// FIXME: We don't actually canonicalize this, we just make it absolute.
if (CanonicalPrefixes)
llvm::sys::fs::make_absolute(InstalledPath);
Repository:
rL LLVM
https://reviews.llvm.org/D37954
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