[Driver] Add crtfastmath.o on Solaris if appropriate

[ro]

Summary

Flang :: Driver/fast_math.f90 FAILs on Solaris because crtfastmath.o is missing from the link line.

This patch adds it as appropriate.

Tested on amd64-pc-solaris2.11.

[MaskRay]

LGTM.

clang/lib/Driver/ToolChains/Solaris.cpp

if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles,
     const char *values_xpg = "values-xpg6.o";
     // Use values-xpg4.o for -std=c90, -std=gnu90, -std=iso9899:199409.
     if (LangStd && LangStd->getLanguage() == Language::C && !LangStd->isC99())
       values_xpg = "values-xpg4.o";
     CmdArgs.push_back(
         Args.MakeArgString(getToolChain().GetFilePath(values_xpg)));
     CmdArgs.push_back(
         Args.MakeArgString(getToolChain().GetFilePath("crtbegin.o")));
+    // Add crtfastmath.o if available and fast math is enabled.
+    getToolChain().addFastMathRuntimeIfAvailable(Args, CmdArgs);
   }
 
   getToolChain().AddFilePathLibArgs(Args, CmdArgs);
 
   Args.AddAllArgs(CmdArgs, {options::OPT_L, options::OPT_T_Group,
                             options::OPT_e, options::OPT_r});
 
   bool NeedsSanitizerDeps = addSanitizerRuntimes(getToolChain(), Args, CmdArgs);

clang/test/Driver/solaris-ld.c

 // -r suppresses default -l and crt*.o, values-*.o like -nostdlib.
 // RUN: %clang -### %s --target=sparc-sun-solaris2.11 -r 2>&1 \
 // RUN:   | FileCheck %s --check-prefix=CHECK-RELOCATABLE
 // CHECK-RELOCATABLE:     "-L
 // CHECK-RELOCATABLE:     "-r"
 // CHECK-RELOCATABLE-NOT: "-l
 // CHECK-RELOCATABLE-NOT: /crt{{[^.]+}}.o
 // CHECK-RELOCATABLE-NOT: /values-{{[^.]+}}.o
+
+// Check that crtfastmath.o is linked with -ffast-math.
+
+// Check sparc-sun-solaris2.11, 32bit
+// RUN: %clang --target=sparc-sun-solaris2.11 -### %s \
+// RUN:        --gcc-toolchain="" \
+// RUN:        --sysroot=%S/Inputs/solaris_sparc_tree 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-NOCRTFASTMATH-SPARC32 %s
+// RUN: %clang --target=sparc-sun-solaris2.11 -### %s -ffast-math \
+// RUN:        --gcc-toolchain="" \
+// RUN:        --sysroot=%S/Inputs/solaris_sparc_tree 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-CRTFASTMATH-SPARC32 %s
+// CHECK-CRTFASTMATH-SPARC32: "-isysroot" "[[SYSROOT:[^"]+]]"
+// CHECK-CRTFASTMATH-SPARC32: "[[SYSROOT]]/usr/gcc/4.8/lib/gcc/sparc-sun-solaris2.11/4.8.2{{/|\\\\}}crtfastmath.o"
+// CHECK-NOCRTFASTMATH-SPARC32-NOT: crtfastmath.o
+
+// Check sparc-pc-solaris2.11, 64bit
+// RUN: %clang -m64 --target=sparc-sun-solaris2.11 -### %s \
+// RUN:        --gcc-toolchain="" \
+// RUN:        --sysroot=%S/Inputs/solaris_sparc_tree 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-NOCRTFASTMATH-SPARC64 %s
+// RUN: %clang -m64 --target=sparc-sun-solaris2.11 -### %s -ffast-math \
+// RUN:        --gcc-toolchain="" \
+// RUN:        --sysroot=%S/Inputs/solaris_sparc_tree 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-CRTFASTMATH-SPARC64 %s
+// CHECK-CRTFASTMATH-SPARC64: "-isysroot" "[[SYSROOT:[^"]+]]"
+// CHECK-CRTFASTMATH-SPARC64: "[[SYSROOT]]/usr/gcc/4.8/lib/gcc/sparc-sun-solaris2.11/4.8.2/sparcv9{{/|\\\\}}crtfastmath.o"
+// CHECK-NOCRTFASTMATH-SPARC64-NOT: crtfastmath.o
+
+// Check i386-pc-solaris2.11, 32bit
+// RUN: %clang --target=i386-pc-solaris2.11 -### %s \
+// RUN:        --gcc-toolchain="" \
+// RUN:        --sysroot=%S/Inputs/solaris_x86_tree 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-NOCRTFASTMATH-X32 %s
+// RUN: %clang --target=i386-pc-solaris2.11 -### %s -ffast-math \
+// RUN:        --gcc-toolchain="" \
+// RUN:        --sysroot=%S/Inputs/solaris_x86_tree 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-CRTFASTMATH-X32 %s
+// CHECK-CRTFASTMATH-X32: "-isysroot" "[[SYSROOT:[^"]+]]"
+// CHECK-CRTFASTMATH-X32: "[[SYSROOT]]/usr/gcc/4.9/lib/gcc/i386-pc-solaris2.11/4.9.4{{/|\\\\}}crtfastmath.o"
+// CHECK-NOCRTFASTMATH-X32-NOT: crtfastmath.o
+
+// Check i386-pc-solaris2.11, 64bit
+// RUN: %clang -m64 --target=i386-pc-solaris2.11 -### %s \
+// RUN:        --gcc-toolchain="" \
+// RUN:        --sysroot=%S/Inputs/solaris_x86_tree 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-NOCRTFASTMATH-X64 %s
+// RUN: %clang -m64 --target=i386-pc-solaris2.11 -### %s -ffast-math \
+// RUN:        --gcc-toolchain="" \
+// RUN:        --sysroot=%S/Inputs/solaris_x86_tree 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-CRTFASTMATH-X64 %s
+// CHECK-CRTFASTMATH-X64: "-isysroot" "[[SYSROOT:[^"]+]]"
+// CHECK-CRTFASTMATH-X64: "[[SYSROOT]]/usr/gcc/4.9/lib/gcc/i386-pc-solaris2.11/4.9.4/amd64{{/|\\\\}}crtfastmath.o"
+// CHECK-NOCRTFASTMATH-X64-NOT: crtfastmath.o