commit 0c3bb2cf8f4fc0332fc0191e713f686f171ef121
author Pirama Arumuga Nainar <pirama@google.com> Thu Aug 19 20:15:12 2021 -0700
committer Pirama Arumuga Nainar <pirama@google.com> Fri Aug 20 14:49:17 2021 -0700
tree 688b923a52f195b8930cf1e52d9c4b090dbb084c
parent 556b45ad41a1eb8c2bbfb654e08ff31e8f6e4cbf

[libm] Set pragma FENV_EACCESS for x86_64, i386

Bug: http://b/157914307

This pragma enables
- -frounding-math, i.e. rounding mode set at runtime are honored
- -ffp-exception-behavior=strict, i.e. FPE semantics are preserved.
- Prevents use of FMA instructions.

Test: Build toolchain without revert https://r.android.com/1298100
      and run bionic-unit-tests.math_h*
Change-Id: I6249b20c93e0fd4ebbdfbe433da4ad4a65d3747b

libm/Android.bp

diff --git a/libm/Android.bp b/libm/Android.bp
index 52229b6..3fe8620 100644
--- a/libm/Android.bp
+++ b/libm/Android.bp
@@ -489,6 +489,7 @@
         "-D_BSD_SOURCE",
         "-DFLT_EVAL_METHOD=0",
         "-include freebsd-compat.h",
+        "-include fenv-access.h",
         "-fno-math-errno",
         "-Wall",
         "-Werror",