Allocate TargetLibraryInfo for the CodeGen passes. Otherwise, it's instantiated

by the BAA pass, which uses the default TargetLibraryInfo constructor.
Unfortunately, the default TargetLibraryInfo constructor assumes all library
calls are available and thus ignores -fno-builtin.
rdar://10947759

llvm-svn: 151745

2 files changed, 33 insertions, 0 deletions

diff --git a/clang/lib/CodeGen/BackendUtil.cpp b/clang/lib/CodeGen/BackendUtil.cpp
index d175bd5..d9bdc32 100644
--- a/clang/lib/CodeGen/BackendUtil.cpp
+++ b/clang/lib/CodeGen/BackendUtil.cpp
@@ -351,6 +351,12 @@ bool EmitAssemblyHelper::AddEmitPasses(BackendAction Action,
   // Create the code generator passes.
   PassManager *PM = getCodeGenPasses();
 
+  // Add LibraryInfo.
+  TargetLibraryInfo *TLI = new TargetLibraryInfo();
+  if (!CodeGenOpts.SimplifyLibCalls)
+    TLI->disableAllFunctions();
+  PM->add(TLI);
+
   // Normal mode, emit a .s or .o file by running the code generator. Note,
   // this also adds codegenerator level optimization passes.
   TargetMachine::CodeGenFileType CGFT = TargetMachine::CGFT_AssemblyFile;
diff --git a/clang/test/CodeGen/libcalls-fno-builtin.c b/clang/test/CodeGen/libcalls-fno-builtin.c
new file mode 100644
index 0000000..41f0b38
--- /dev/null
+++ b/clang/test/CodeGen/libcalls-fno-builtin.c
@@ -0,0 +1,27 @@
+// RUN: %clang_cc1 -S -O3 -fno-builtin -o - %s | FileCheck %s
+
+double ceil(double x);
+double copysign(double,double);
+double cos(double x);
+double fabs(double x);
+double floor(double x);
+
+double t1(double x) { return ceil(x); }
+// CHECK: t1
+// CHECK: ceil
+
+double t2(double x, double y) { return copysign(x,y); }
+// CHECK: t2
+// CHECK: copysign
+
+double t3(double x) { return cos(x); }
+// CHECK: t3
+// CHECK: cos
+
+double t4(double x) { return fabs(x); }
+// CHECK: t4
+// CHECK: fabs
+
+double t5(double x) { return floor(x); }
+// CHECK: t5
+// CHECK: floor