the mystery of math.h in lib/gcc/%triple-name%/%gcc-version%/include-fixed

[Dennis Clarke]

On 10/24/2018 05:04 AM, Jonathan Wakely wrote:
> On Wed, 24 Oct 2018 at 09:53, Jonathan Wakely <jwakely.gcc@gmail.com> wrote:
>>
>> On Wed, 24 Oct 2018 at 04:25, Dennis Clarke <dclarke@blastwave.org> wrote:
>>> The question has to be where do these "include-fixed" headers come
>>> from?
>>
>> The include-fixed headers are generated as part of the GCC build
>> process. The contents of the fixincludes dir in the GCC sources apply
>> a set of rules to fix known problems in the system headers (either
>> conformance bugs, or incompatibilities with GCC).
> 
> This is (barely) documented at
> https://gcc.gnu.org/onlinedocs/gccint/Headers.html
> 

OKay .. maybe I can write something ( anything ) with examples but my
test case examples are Debian on ppc64 and Solaris on sparc as well as
FreeBSD on x86_64.  Something somewhere that says certain C++ standards
are expected ... or not ... I have yet to figure it out here.

Long email ... on the way  :-\

Dennis Clarke