Have clang pay attention to the LIBRARY_PATH environment variable.

The LIBRARY_PATH environment variable should be honored by clang. Have the
driver pass the directories to the linker.
<rdar://problem/9743567> and PR10296.

llvm-svn: 152578

clang/lib/Driver/Tools.cpp

@@ -88,6 +88,38 @@ static void QuoteTarget(StringRef Target,
   }
 }
 
+static void AddDirectoryList(const ArgList &Args,
+                             ArgStringList &CmdArgs,
+                             const char *ArgName,
+                             const char *DirList) {
+  if (!DirList)
+    return; // Nothing to do.
+
+  StringRef Dirs(DirList);
+  if (Dirs.empty()) // Empty string should not add '.'.
+    return;
+
+  StringRef::size_type Delim;
+  while ((Delim = Dirs.find(llvm::sys::PathSeparator)) != StringRef::npos) {
+    if (Delim == 0) { // Leading colon.
+      CmdArgs.push_back(ArgName);
+      CmdArgs.push_back(".");
+    } else {
+      CmdArgs.push_back(ArgName);
+      CmdArgs.push_back(Args.MakeArgString(Dirs.substr(0, Delim)));
+    }
+    Dirs = Dirs.substr(Delim + 1);
+  }
+
+  if (Dirs.empty()) { // Trailing colon.
+    CmdArgs.push_back(ArgName);
+    CmdArgs.push_back(".");
+  } else { // Add the last path.
+    CmdArgs.push_back(ArgName);
+    CmdArgs.push_back(Args.MakeArgString(Dirs));
+  }
+}
+
 static void AddLinkerInputs(const ToolChain &TC,
                             const InputInfoList &Inputs, const ArgList &Args,
                             ArgStringList &CmdArgs) {
@@ -128,6 +160,9 @@ static void AddLinkerInputs(const ToolChain &TC,
     } else
       A.renderAsInput(Args, CmdArgs);
   }
+
+  // LIBRARY_PATH - included following the user specified library paths.
+  AddDirectoryList(Args, CmdArgs, "-L", ::getenv("LIBRARY_PATH"));
 }
 
 /// \brief Determine whether Objective-C automated reference counting is
@@ -162,38 +197,6 @@ static void addProfileRT(const ToolChain &TC, const ArgList &Args,
   CmdArgs.push_back(Args.MakeArgString(ProfileRT));
 }
 
-static void AddIncludeDirectoryList(const ArgList &Args,
-                                    ArgStringList &CmdArgs,
-                                    const char *ArgName,
-                                    const char *DirList) {
-  if (!DirList)
-    return; // Nothing to do.
-
-  StringRef Dirs(DirList);
-  if (Dirs.empty()) // Empty string should not add '.'.
-    return;
-
-  StringRef::size_type Delim;
-  while ((Delim = Dirs.find(llvm::sys::PathSeparator)) != StringRef::npos) {
-    if (Delim == 0) { // Leading colon.
-      CmdArgs.push_back(ArgName);
-      CmdArgs.push_back(".");
-    } else {
-      CmdArgs.push_back(ArgName);
-      CmdArgs.push_back(Args.MakeArgString(Dirs.substr(0, Delim)));
-    }
-    Dirs = Dirs.substr(Delim + 1);
-  }
-
-  if (Dirs.empty()) { // Trailing colon.
-    CmdArgs.push_back(ArgName);
-    CmdArgs.push_back(".");
-  } else { // Add the last path.
-    CmdArgs.push_back(ArgName);
-    CmdArgs.push_back(Args.MakeArgString(Dirs));
-  }
-}
-
 void Clang::AddPreprocessingOptions(Compilation &C,
                                     const Driver &D,
                                     const ArgList &Args,
@@ -399,19 +402,19 @@ void Clang::AddPreprocessingOptions(Compilation &C,
   // frontend into the driver. It will allow deleting 4 otherwise unused flags.
   // CPATH - included following the user specified includes (but prior to
   // builtin and standard includes).
-  AddIncludeDirectoryList(Args, CmdArgs, "-I", ::getenv("CPATH"));
+  AddDirectoryList(Args, CmdArgs, "-I", ::getenv("CPATH"));
   // C_INCLUDE_PATH - system includes enabled when compiling C.
-  AddIncludeDirectoryList(Args, CmdArgs, "-c-isystem",
+  AddDirectoryList(Args, CmdArgs, "-c-isystem",
-                          ::getenv("C_INCLUDE_PATH"));
+                   ::getenv("C_INCLUDE_PATH"));
   // CPLUS_INCLUDE_PATH - system includes enabled when compiling C++.
-  AddIncludeDirectoryList(Args, CmdArgs, "-cxx-isystem",
+  AddDirectoryList(Args, CmdArgs, "-cxx-isystem",
-                          ::getenv("CPLUS_INCLUDE_PATH"));
+                   ::getenv("CPLUS_INCLUDE_PATH"));
   // OBJC_INCLUDE_PATH - system includes enabled when compiling ObjC.
-  AddIncludeDirectoryList(Args, CmdArgs, "-objc-isystem",
+  AddDirectoryList(Args, CmdArgs, "-objc-isystem",
-                          ::getenv("OBJC_INCLUDE_PATH"));
+                   ::getenv("OBJC_INCLUDE_PATH"));
   // OBJCPLUS_INCLUDE_PATH - system includes enabled when compiling ObjC++.
-  AddIncludeDirectoryList(Args, CmdArgs, "-objcxx-isystem",
+  AddDirectoryList(Args, CmdArgs, "-objcxx-isystem",
-                          ::getenv("OBJCPLUS_INCLUDE_PATH"));
+                   ::getenv("OBJCPLUS_INCLUDE_PATH"));
 
   // Add C++ include arguments, if needed.
   if (types::isCXX(Inputs[0].getType()))

clang/test/Driver/linker-opts.c

@@ -0,0 +1,2 @@
+// RUN: env LIBRARY_PATH=%T/test1 %clang -x c %s -### -o foo 2> %t.log
+// RUN: grep '".*ld.*" .*"-L" "%T/test1"' %t.log