MaskRay wrote:
> This broke a bot, I reverted and it's back green here:
> [lab.llvm.org/buildbot/#/builders/272/builds/14069](https://lab.llvm.org/buildbot/#/builders/272/builds/14069)
Thanks. llvm-project/libc has a pattern like the following.
```
namespace libc {
double log2(double x);
}
extern "C" double log2(double);
namespace std {
using ::log2;
}
using std::log2;
namespace libc {
decltype(libc::log2) __log2_impl__ __asm__("log2");
decltype(libc::log2) log2 __attribute__((alias("log2")));
double __log2_impl__(double x) { return x; }
}
```
`ItaniumMangleContextImpl::mangleCXXName` called by `mangleName` (new code in
this PR) asserts that the parameter is one of
FunctionDecl/VariableDecl/TemplateParamObjectDecl and fails on a
`UsingShadowDecl`.
We can check `FunctionDecl` before `mangleCXXName` (we only handle global
namespace names, where variables are not mangled).
To make the regression test more useful, I'll place it in `CodeGen/alias.cpp`
separately.
https://github.com/llvm/llvm-project/pull/87130
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