[Buildroot] [PATCH] toolchain-wrapper: do not use deprecated -mfused-madd

Waldemar Brodkorb wbx at openadk.org
Fri Aug 11 17:32:46 UTC 2017


Hi,
Thomas Petazzoni wrote,

> Hello,
> 
> On Fri, 11 Aug 2017 07:28:48 +0200, Waldemar Brodkorb wrote:
> > GCC deprecated -mfused-madd, -ffp-contract=off should
> > be used for Xburst workaround.
> > uClibc compilations will fail, because a gcc warning
> > is emitted while checking for TLS support in the compiler.
> 
> In which gcc version was -ffp-contract=off added ? Can we use that
> unconditionally, or is it only available in recent gcc versions ?

It was added in commit b9be572eda05cd23bbabd6409387d2c7ac782715.

Not sure how to find when it was added in a release.
4.6.4 seems to have it:
https://gcc.gnu.org/onlinedocs/gcc-4.6.4/gcc/Optimize-Options.html#index-ffp_002dcontract-691

I don't find it in earlier release docs.

best regards
 Waldemar



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