GMP test fails with -flto

[Vincent Lefevre]

On 2019-07-01 16:59:06 +0200, Marc Glisse wrote:
> On Mon, 1 Jul 2019, Vincent Lefevre wrote:
> > I suggest another solution:
> > 
> > First try like now. If the format is unknown, check whether the
> > object file contains the string ".gnu.lto" (which should mean
> > that GCC was used with LTO), and in this case, try again with
> > "-fno-lto" as the patch was doing.
> 
> We also have problems with clang's version of LTO. IIRC using emscripten to
> compile GMP has a similar issue.

With clang 7 and above, "ThinLTO" appears in the object file.

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