[Driver][Darwin] Emit an error when using -pg on OS without support for it.

Instead of letting a program fail at runtime, emit an error during
compilation.

rdar://problem/12206955

Reviewers: dexonsmith, bob.wilson, steven_wu

Reviewed By: steven_wu

Subscribers: jkorous, cfe-commits

Differential Revision: https://reviews.llvm.org/D57991

llvm-svn: 354084

diff --git a/clang/include/clang/Basic/DiagnosticDriverKinds.td b/clang/include/clang/Basic/DiagnosticDriverKinds.td
index 189e056..3ebd931 100644 (file)
--- a/clang/include/clang/Basic/DiagnosticDriverKinds.td
+++ b/clang/include/clang/Basic/DiagnosticDriverKinds.td
@@ -96,6 +96,8 @@ def err_drv_clang_unsupported : Error<
   "the clang compiler does not support '%0'">;
 def err_drv_clang_unsupported_opt_cxx_darwin_i386 : Error<
   "the clang compiler does not support '%0' for C++ on Darwin/i386">;
+def err_drv_clang_unsupported_opt_pg_darwin: Error<
+  "the clang compiler does not support -pg option on %select{Darwin|versions of OS X 10.9 and later}0">;
 def err_drv_clang_unsupported_opt_faltivec : Error<
   "the clang compiler does not support '%0', %1">;
 def err_drv_command_failed : Error<

diff --git a/clang/lib/Driver/ToolChains/Darwin.cpp b/clang/lib/Driver/ToolChains/Darwin.cpp
index 582f3f9..9b3f374 100644 (file)
--- a/clang/lib/Driver/ToolChains/Darwin.cpp
+++ b/clang/lib/Driver/ToolChains/Darwin.cpp
@@ -2289,22 +2289,27 @@ void Darwin::addStartObjectFileArgs(const ArgList &Args,
       }
     } else {
       if (Args.hasArg(options::OPT_pg) && SupportsProfiling()) {
-        if (Args.hasArg(options::OPT_static) ||
-            Args.hasArg(options::OPT_object) ||
-            Args.hasArg(options::OPT_preload)) {
-          CmdArgs.push_back("-lgcrt0.o");
-        } else {
-          CmdArgs.push_back("-lgcrt1.o");
+        if (isTargetMacOS() && isMacosxVersionLT(10, 9)) {
+          if (Args.hasArg(options::OPT_static) ||
+              Args.hasArg(options::OPT_object) ||
+              Args.hasArg(options::OPT_preload)) {
+            CmdArgs.push_back("-lgcrt0.o");
+          } else {
+            CmdArgs.push_back("-lgcrt1.o");
 
-          // darwin_crt2 spec is empty.
+            // darwin_crt2 spec is empty.
+          }
+          // By default on OS X 10.8 and later, we don't link with a crt1.o
+          // file and the linker knows to use _main as the entry point.  But,
+          // when compiling with -pg, we need to link with the gcrt1.o file,
+          // so pass the -no_new_main option to tell the linker to use the
+          // "start" symbol as the entry point.
+          if (isTargetMacOS() && !isMacosxVersionLT(10, 8))
+            CmdArgs.push_back("-no_new_main");
+        } else {
+          getDriver().Diag(diag::err_drv_clang_unsupported_opt_pg_darwin)
+              << isTargetMacOS();
         }
-        // By default on OS X 10.8 and later, we don't link with a crt1.o
-        // file and the linker knows to use _main as the entry point.  But,
-        // when compiling with -pg, we need to link with the gcrt1.o file,
-        // so pass the -no_new_main option to tell the linker to use the
-        // "start" symbol as the entry point.
-        if (isTargetMacOS() && !isMacosxVersionLT(10, 8))
-          CmdArgs.push_back("-no_new_main");
       } else {
         if (Args.hasArg(options::OPT_static) ||
             Args.hasArg(options::OPT_object) ||

diff --git a/clang/test/Driver/darwin-ld.c b/clang/test/Driver/darwin-ld.c
index 5198ef0..181d4e3 100644 (file)
--- a/clang/test/Driver/darwin-ld.c
+++ b/clang/test/Driver/darwin-ld.c
@@ -203,6 +203,14 @@
 // LINK_PG: -lgcrt1.o
 // LINK_PG: -no_new_main
 
+// RUN: %clang -target i386-apple-darwin13 -pg -### %t.o 2> %t.log
+// RUN: FileCheck -check-prefix=LINK_PG_NO_SUPPORT_OSX %s < %t.log
+// LINK_PG_NO_SUPPORT_OSX: error: the clang compiler does not support -pg option on versions of OS X
+
+// RUN: %clang -target x86_64-apple-ios5.0 -pg -### %t.o 2> %t.log
+// RUN: FileCheck -check-prefix=LINK_PG_NO_SUPPORT %s < %t.log
+// LINK_PG_NO_SUPPORT: error: the clang compiler does not support -pg option on Darwin
+
 // Check that clang links with libgcc_s.1 for iOS 4 and earlier, but not arm64.
 // RUN: %clang -target armv7-apple-ios4.0 -miphoneos-version-min=4.0 -### %t.o 2> %t.log
 // RUN: FileCheck -check-prefix=LINK_IOS_LIBGCC_S %s < %t.log