[libc][math][c23] Temporarily disable float16 on RISC-V

[overmighty]

See Buildbot failures:

• https://lab.llvm.org/buildbot/#/builders/257/builds/13450
• https://lab.llvm.org/buildbot/#/builders/256/builds/14531

[overmighty]

cc @lntue

[llvmbot]

@llvm/pr-subscribers-libc

Author: OverMighty (overmighty)

Changes

See Buildbot failures:

• https://lab.llvm.org/buildbot/#/builders/257/builds/13450
• https://lab.llvm.org/buildbot/#/builders/256/builds/14531

---

Full diff: https://github.com/llvm/llvm-project/pull/94984.diff

1 Files Affected:

• (modified) libc/include/llvm-libc-macros/float16-macros.h (+2-1)

diff --git a/libc/include/llvm-libc-macros/float16-macros.h b/libc/include/llvm-libc-macros/float16-macros.h
index 9f17503d85130..3f819ad53df71 100644
--- a/libc/include/llvm-libc-macros/float16-macros.h
+++ b/libc/include/llvm-libc-macros/float16-macros.h
@@ -10,7 +10,8 @@
 #define LLVM_LIBC_MACROS_FLOAT16_MACROS_H
 
 #if defined(__FLT16_MANT_DIG__) &&                                             \
-    (!defined(__GNUC__) || __GNUC__ >= 13 || defined(__clang__))
+    (!defined(__GNUC__) || __GNUC__ >= 13 || defined(__clang__)) &&            \
+    !defined(__riscv)
 #define LIBC_TYPES_HAS_FLOAT16
 #endif
 

[nickdesaulniers]

What's the plan for getting this re-enabled? Is the a bug on file? If not, please file one.