/// for kernel extensions (Darwin-specific).
virtual void AddCCKextLibArgs(const ArgList &Args,
ArgStringList &CmdArgs) const;
+
+ /// AddFastMathRuntimeIfAvailable - If a runtime library exists that sets
+ /// global flags for unsafe floating point math, add it and return true.
+ ///
+ /// This checks for presence of the -ffast-math or -funsafe-math flags.
+ virtual bool AddFastMathRuntimeIfAvailable(const ArgList &Args,
+ ArgStringList &CmdArgs) const;
};
} // end namespace driver
#include "clang/Driver/ArgList.h"
#include "clang/Driver/Driver.h"
#include "clang/Driver/DriverDiagnostic.h"
+#include "clang/Driver/Option.h"
#include "clang/Driver/Options.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/Support/ErrorHandling.h"
ArgStringList &CmdArgs) const {
CmdArgs.push_back("-lcc_kext");
}
+
+bool ToolChain::AddFastMathRuntimeIfAvailable(const ArgList &Args,
+ ArgStringList &CmdArgs) const {
+ // Check if -ffast-math or -funsafe-math is enabled.
+ Arg *A = Args.getLastArg(options::OPT_ffast_math,
+ options::OPT_fno_fast_math,
+ options::OPT_funsafe_math_optimizations,
+ options::OPT_fno_unsafe_math_optimizations);
+
+ if (!A || A->getOption().getID() == options::OPT_fno_fast_math ||
+ A->getOption().getID() == options::OPT_fno_unsafe_math_optimizations)
+ return false;
+
+ // If crtfastmath.o exists add it to the arguments.
+ std::string Path = GetFilePath("crtfastmath.o");
+ if (Path == "crtfastmath.o") // Not found.
+ return false;
+
+ CmdArgs.push_back(Args.MakeArgString(Path));
+ return true;
+}
else
crtbegin = isAndroid ? "crtbegin_dynamic.o" : "crtbegin.o";
CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtbegin)));
+
+ // Add crtfastmath.o if available and fast math is enabled.
+ ToolChain.AddFastMathRuntimeIfAvailable(Args, CmdArgs);
}
Args.AddAllArgs(CmdArgs, options::OPT_L);
// CHECK-FSL-PPC64: "{{.*}}/crt1.o"
// CHECK-FSL-PPC64: "{{.*}}/crtbegin.o"
// CHECK-FSL-PPC64: "-L[[SYSROOT]]/usr/lib64/powerpc64-fsl-linux/4.6.2/../.."
+//
+// Check that crtfastmath.o is linked with -ffast-math.
+// RUN: %clang -target x86_64-unknown-linux -### %s \
+// RUN: --sysroot=%S/Inputs/basic_linux_tree 2>&1 \
+// RUN: | FileCheck --check-prefix=CHECK-NOCRTFASTMATH %s
+// RUN: %clang -target x86_64-unknown-linux -### %s -ffast-math \
+// RUN: --sysroot=%S/Inputs/basic_linux_tree 2>&1 \
+// RUN: | FileCheck --check-prefix=CHECK-CRTFASTMATH %s
+// RUN: %clang -target x86_64-unknown-linux -### %s -funsafe-math-optimizations\
+// RUN: --sysroot=%S/Inputs/basic_linux_tree 2>&1 \
+// RUN: | FileCheck --check-prefix=CHECK-CRTFASTMATH %s
+// RUN: %clang -target x86_64-unknown-linux -### %s -ffast-math -fno-fast-math \
+// RUN: --sysroot=%S/Inputs/basic_linux_tree 2>&1 \
+// RUN: | FileCheck --check-prefix=CHECK-NOCRTFASTMATH %s
+// We don't have crtfastmath.o in the i386 tree, use it to check that file
+// detection works.
+// RUN: %clang -target i386-unknown-linux -### %s -ffast-math \
+// RUN: --sysroot=%S/Inputs/basic_linux_tree 2>&1 \
+// RUN: | FileCheck --check-prefix=CHECK-NOCRTFASTMATH %s
+// CHECK-CRTFASTMATH: usr/lib/gcc/x86_64-unknown-linux/4.6.0/crtfastmath.o
+// CHECK-NOCRTFASTMATH-NOT: crtfastmath.o