From: Reid Kleckner <rnk@google.com>
Date: Thu, 29 Aug 2019 20:32:53 +0000 (+0000)
Subject: Fix the build for MSVC builds using M_PI
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=9a699c8345ee83c28f0c55d685d70f5e7d779df1;p=llvm

Fix the build for MSVC builds using M_PI

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@370405 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp b/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp
index 1562523a851..a48243aad29 100644
--- a/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp
+++ b/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp
@@ -11,6 +11,13 @@
 /// \todo This should be generated by TableGen.
 //===----------------------------------------------------------------------===//
 
+#if defined(_MSC_VER) || defined(__MINGW32__)
+// According to Microsoft, one must set _USE_MATH_DEFINES in order to get M_PI
+// from the Visual C++ cmath / math.h headers:
+// https://docs.microsoft.com/en-us/cpp/c-runtime-library/math-constants?view=vs-2019
+#define _USE_MATH_DEFINES
+#endif
+
 #include "AMDGPU.h"
 #include "AMDGPULegalizerInfo.h"
 #include "AMDGPUTargetMachine.h"