https://bugs.llvm.org/show_bug.cgi?id=52575
Bug ID: 52575
Summary: Fail to build LLVM due to cmath on macOS 10.13
Product: new-bugs
Version: 12.0
Hardware: Macintosh
OS: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: ch...@chrislong.dev
CC: htmldevelo...@gmail.com, llvm-bugs@lists.llvm.org
Created attachment 25464
--> https://bugs.llvm.org/attachment.cgi?id=25464&action=edit
Full build log
I originally reported this at https://github.com/rust-lang/rust/issues/88068
and was told this is an upstream issue in LLVM; from browsing the Rust source,
it appears the regression appeared between LLVM 11 and 12.
When trying to build Rust using Homebrew on macOS 10.13, I'm receiving several
errors similar to:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/cmath:325:9:
error: no member named 'isunordered' in the global namespace
using ::isunordered;
~~^
I've attached the whole build log. Per
https://stackoverflow.com/a/68113682/165713, a mitigation seems to be to add a
CMake directive like "set(CMAKE_OSX_SYSROOT
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk)".
A Rust engineer also suggested possible fixes at
https://stackoverflow.com/a/58670035.
Apologies for not having more detail; I'm new to Rust and even newer to LLVM,
but I'll definitely help here however I can!
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