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Re: [PATCH] Enable non-complex math builtins from C99 for Bionic

On Thu, 5 Sep 2013, Bernhard Reutner-Fischer wrote:

> uClibc has C99 math support optionally as well as other optional, nonstandard
> feature sets. Your patch does not seem to check (in a cross-compilable
> fashion, of course) if C99 math is supported in libc or not, thus regressing
> on uClibc with C99_MATH enabled.

It is a basic principle that it should be possible to bootstrap cross 
tools by building the compiler, once, then using it to build runtime 
libraries.  We haven't got there yet, but configure-time tests for library 
features that affect how the compiler behaves are best avoided so as to 
support such bootstraps - and if present, it's best for there to be a 
corresponding configure option to override them, and a command-line option 
to control things on a per-multilib basis.  To the extent that we do have 
configure support for checking library headers if those are available when 
the compiler is configured, it only supports checking the default multilib 
and not headers for other multilibs.

Joseph S. Myers

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