Revert "Export `fenv` functions on all platforms (#213)"

The implementation of `fesetenv` cannot be portable, as the value of
`FE_DFL_ENV` differs between platforms. On FreeBSD, it is a actual
environment. With glibc however, it's a sentinel -1 handled in the
implementation of its floating point functions.

With openlibm based on FreeBSD's libm, it assumes `FE_DFL_ENV` to be an
actual environment. That assumption breaks using code that was compiled
against glibc, e.g., `libcuda`:

```
Thread 1 "julia-debug" received signal SIGSEGV, Segmentation fault.
0x00007ffff7b855d0 in fesetenv () from /home/tim/Julia/julia/build/release/usr/bin/../lib/libopenlibm.so
(gdb) bt
```

This reverts commit 5a27b4c0c0.

Fixes https://github.com/JuliaLang/julia/issues/38427.
dev
Tim Besard 2 years ago
parent b34f107e24
commit be31bff11d
  1. 2
      amd64/fenv.c

@ -29,7 +29,7 @@
#include "bsd_fpu.h"
#include "math_private.h"
#ifndef OPENLIBM_USE_HOST_FENV_H
#ifdef _WIN32
#define __fenv_static OLM_DLLEXPORT
#endif
#include <openlibm_fenv.h>

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