[PATCH] D25338: [Driver] Make -print-libgcc-file-name print compiler-rt lib when used

[Michał Górny via cfe-commits]

mgorny removed rL LLVM as the repository for this revision.
mgorny updated this revision to Diff 73979.
This revision is now accepted and ready to land.

https://reviews.llvm.org/D25338

Files:
  docs/CommandGuide/clang.rst
  include/clang/Driver/Options.td
  lib/Driver/Driver.cpp
  test/Driver/print-libgcc-file-name-clangrt.c
  test/Driver/print-libgcc-file-name-libgcc.c
  test/lit.cfg


Index: test/lit.cfg
===================================================================
--- test/lit.cfg
+++ test/lit.cfg
@@ -375,6 +375,11 @@
 if platform.system() not in ['Windows']:
     config.available_features.add('utf8-capable-terminal')
 
+# Support for libgcc runtime. Used to rule out tests that require
+# clang to run with -rtlib=libgcc.
+if platform.system() not in ['Darwin', 'Fuchsia']:
+    config.available_features.add('libgcc')
+
 # Native compilation: Check if triples match.
 # FIXME: Consider cases that target can be executed
 # even if host_triple were different from target_triple.
Index: test/Driver/print-libgcc-file-name-libgcc.c
===================================================================
--- /dev/null
+++ test/Driver/print-libgcc-file-name-libgcc.c
@@ -0,0 +1,7 @@
+// Test that -print-libgcc-file-name correctly respects -rtlib=libgcc.
+
+// REQUIRES: libgcc
+
+// RUN: %clang -rtlib=libgcc -print-libgcc-file-name 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-LIBGCC %s
+// CHECK-LIBGCC: libgcc.a
Index: test/Driver/print-libgcc-file-name-clangrt.c
===================================================================
--- /dev/null
+++ test/Driver/print-libgcc-file-name-clangrt.c
@@ -0,0 +1,11 @@
+// Test that -print-libgcc-file-name correctly respects -rtlib=compiler-rt.
+
+// RUN: %clang -rtlib=compiler-rt -print-libgcc-file-name 2>&1 \
+// RUN:     --target=x86_64-pc-linux \
+// RUN:   | FileCheck --check-prefix=CHECK-CLANGRT-X8664 %s
+// CHECK-CLANGRT-X8664: libclang_rt.builtins-x86_64.a
+
+// RUN: %clang -rtlib=compiler-rt -print-libgcc-file-name 2>&1 \
+// RUN:     --target=i686-pc-linux \
+// RUN:   | FileCheck --check-prefix=CHECK-CLANGRT-I686 %s
+// CHECK-CLANGRT-I686: libclang_rt.builtins-i686.a
Index: lib/Driver/Driver.cpp
===================================================================
--- lib/Driver/Driver.cpp
+++ lib/Driver/Driver.cpp
@@ -994,7 +994,15 @@
   }
 
   if (C.getArgs().hasArg(options::OPT_print_libgcc_file_name)) {
-    llvm::outs() << GetFilePath("libgcc.a", TC) << "\n";
+    ToolChain::RuntimeLibType RLT = TC.GetRuntimeLibType(C.getArgs());
+    switch (RLT) {
+    case ToolChain::RLT_CompilerRT:
+      llvm::outs() << TC.getCompilerRTArgString(C.getArgs(), "builtins") << "\n";
+      break;
+    case ToolChain::RLT_Libgcc:
+      llvm::outs() << GetFilePath("libgcc.a", TC) << "\n";
+      break;
+    }
     return false;
   }
 
Index: include/clang/Driver/Options.td
===================================================================
--- include/clang/Driver/Options.td
+++ include/clang/Driver/Options.td
@@ -1861,7 +1861,8 @@
 def print_ivar_layout : Flag<["-"], "print-ivar-layout">, Flags<[CC1Option]>,
   HelpText<"Enable Objective-C Ivar layout bitmap print trace">;
 def print_libgcc_file_name : Flag<["-", "--"], "print-libgcc-file-name">,
-  HelpText<"Print the library path for \"libgcc.a\"">;
+  HelpText<"Print the library path for the currently used compiler runtime "
+           "library (\"libgcc.a\" or \"libclang_rt.builtins.*.a\")">;
 def print_multi_directory : Flag<["-", "--"], "print-multi-directory">;
 def print_multi_lib : Flag<["-", "--"], "print-multi-lib">;
 def print_multi_os_directory : Flag<["-", "--"], "print-multi-os-directory">,
Index: docs/CommandGuide/clang.rst
===================================================================
--- docs/CommandGuide/clang.rst
+++ docs/CommandGuide/clang.rst
@@ -394,7 +394,8 @@
 
 .. option:: -print-libgcc-file-name
 
-  Print the library path for "libgcc.a".
+  Print the library path for the currently used compiler runtime library
+  ("libgcc.a" or "libclang_rt.builtins.*.a").
 
 .. option:: -print-prog-name=<name>
 


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