From: Pirama Arumuga Nainar <pirama@google.com>
Date: Wed, 22 Aug 2018 17:43:05 +0000 (+0000)
Subject: [Android] Default to -fno-math-errno
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=6b133f8fc61e264ac6cf8ffd5d214ded1b8ae57b;p=clang

[Android] Default to -fno-math-errno

Summary: Android's libm does not set errno.

Reviewers: srhines, enh

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D51068

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@340424 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Driver/ToolChains/Linux.cpp b/lib/Driver/ToolChains/Linux.cpp
index f8f3623918..4e4317076f 100644
--- a/lib/Driver/ToolChains/Linux.cpp
+++ b/lib/Driver/ToolChains/Linux.cpp
@@ -907,6 +907,12 @@ bool Linux::isPIEDefault() const {
           getTriple().isMusl() || getSanitizerArgs().requiresPIE();
 }
 
+bool Linux::IsMathErrnoDefault() const {
+  if (getTriple().isAndroid())
+    return false;
+  return Generic_ELF::IsMathErrnoDefault();
+}
+
 SanitizerMask Linux::getSupportedSanitizers() const {
   const bool IsX86 = getTriple().getArch() == llvm::Triple::x86;
   const bool IsX86_64 = getTriple().getArch() == llvm::Triple::x86_64;
diff --git a/lib/Driver/ToolChains/Linux.h b/lib/Driver/ToolChains/Linux.h
index 22dbbecf6b..2f0c36190f 100644
--- a/lib/Driver/ToolChains/Linux.h
+++ b/lib/Driver/ToolChains/Linux.h
@@ -38,6 +38,7 @@ public:
   void AddIAMCUIncludeArgs(const llvm::opt::ArgList &DriverArgs,
                            llvm::opt::ArgStringList &CC1Args) const override;
   bool isPIEDefault() const override;
+  bool IsMathErrnoDefault() const override;
   SanitizerMask getSupportedSanitizers() const override;
   void addProfileRTLibs(const llvm::opt::ArgList &Args,
                         llvm::opt::ArgStringList &CmdArgs) const override;
diff --git a/test/Driver/fast-math.c b/test/Driver/fast-math.c
index 57e5d2c715..470e5a8104 100644
--- a/test/Driver/fast-math.c
+++ b/test/Driver/fast-math.c
@@ -95,6 +95,8 @@
 // RUN:   | FileCheck --check-prefix=CHECK-NO-MATH-ERRNO %s
 // RUN: %clang -### -target x86_64-fuchsia -c %s 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-NO-MATH-ERRNO %s
+// RUN: %clang -### -target x86_64-linux-android -c %s 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-NO-MATH-ERRNO %s
 //
 // Check that -ffast-math disables -fmath-errno, and -fno-fast-math merely
 // preserves the target default. Also check various flag set operations between