[flang-commits] [flang] [flang][doc] Added information about `REAL(16)` math intrinsics support. (PR #87710)

[Pete Steinfeld via flang-commits]

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+<!--===- docs/Real16MathSupport.md
+
+   Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+   See https://llvm.org/LICENSE.txt for license information.
+   SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+-->
+
+# Flang support for REAL(16) math intrinsics
+
+To support most `REAL(16)` (i.e. 128-bit float) math intrinsics Flang relies
+on third-party libraries providing the implementation.
+
+`-DFLANG_RUNTIME_F128_MATH_LIB=libquadmath` CMake option can be used
+to build `FortranFloat128Math` library that has unresolved references
+to GCC `libquadmath` library. Flang driver built with this option
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psteinfeld wrote:

This should read "A Flang driver" rather than "Flang driver".

https://github.com/llvm/llvm-project/pull/87710