[llvm-dev] Minimal glibc version supported by LLVM build

[Rui Ueyama via llvm-dev]

Serguei,

glibc 2.5 was released 11 years ago, so I wonder what operating system you
are using now.

On Wed, Oct 4, 2017 at 12:08 AM, Serguei Katkov via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hi All,
>
>
>
> The landed patch https://reviews.llvm.org/D38481 introduced the usage of
> CPU_COUNT defined in glibc sched.h header.
>
> I failed to find this symbol in sched.h of glibc version 2.5-24, so
> compilation just fails.
>
> /home/dolphin/merge-from-upstream-area/ws/pristine/lib/Support/Threading.cpp:
> In function ‘unsigned int llvm::hardware_concurrency()’:
>
> /home/dolphin/merge-from-upstream-area/ws/pristine/lib/Support/Threading.cpp:80:26:
> error: ‘CPU_COUNT’ was not declared in this scope
>
>      return CPU_COUNT(&Set);
>
>                           ^
>
>
>
> It is buildable with newest version of glibc.
>
> I tried to find a requirements for glibc version in LLVM documentation but
> failed.
>
> So I wonder whether there is such requirement or not.
>
> Could anyone point me to this documentation?
>
>
>
> I'm trying to understand whether patch is wrong which relies on
> availability of library but does not check the symbol itself or this
> version of glibc is not supported.
>
>
>
> Thank you,
>
> Serguei.
>
>
>
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>
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