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doc: Update LTO support status in README.md #176

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14 changes: 7 additions & 7 deletions README.md
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Expand Up @@ -94,13 +94,13 @@ not always be able to retrieve cryptographically-sound random numbers
from the operating system; if you call these functions with a null
pointer for the “rbytes” argument, be prepared for them to fail.

As of mid-2018, GCC and LLVM don’t support link-time optimization of
libraries that use symbol versioning. If you build libxcrypt with
either of these compilers, do not use `-flto`. See [GCC bug 48200][1]
for specifics; the problem is very similar for LLVM. Because this is,
at its root, a set of missing compiler features, we expect link-time
optimization won’t work in other C compilers either, but we haven’t
tested it ourselves.
Link-time optimization of libraries that use symbol versioning is only
supported with a recent GCC (>= 10.1) or LLVM (>= 10.0) release. If you
build libxcrypt with an earlier GCC or LLVM compilers, do not use `-flto`.
See [GCC bug 48200][1] for specifics; the problem is very similar for LLVM.
Because this is, at its root, a set of missing compiler features, we expect
link-time optimization won’t work in other C compilers either, but we
haven’t tested it ourselves.

[1]: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=48200

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