From 8afdd56babf69cd8e3b45d0baff0d4fc20d088a0 Mon Sep 17 00:00:00 2001
From: Chandler Carruth <chandlerc@gmail.com>
Date: Wed, 8 Jun 2011 10:13:14 +0000
Subject: [PATCH] hack in my new variables for GCC

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@132743 91177308-0d34-0410-b5e6-96231b3b80d8
---
 CMakeLists.txt                      | 12 ++++++++
 include/clang/Config/config.h.cmake | 12 ++++++++
 lib/Driver/ToolChains.cpp           | 44 +++++++++++++----------------
 3 files changed, 44 insertions(+), 24 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index aa89823e76..dd33f814c3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -54,6 +54,18 @@ endif()
 set(CLANG_RESOURCE_DIR "" CACHE STRING
   "Relative directory from the Clang binary to its resource files.")
 
+set(CLANG_GCC_INSTALL_ROOT "" CACHE STRING
+  "The GCC install root to use for headers and libraries.")
+
+set(CLANG_GCC_LIB_DIR "/lib/gcc" CACHE STRING
+  "The directory relative to the install root for GCC libraries.")
+
+set(CLANG_GCC_ARCH "" CACHE STRING
+  "The architecture string of the GCC installation.")
+
+set(CLANG_GCC_VERSION "" CACHE STRING
+  "The version of the GCC installation.")
+
 set(C_INCLUDE_DIRS "" CACHE STRING
   "Colon separated list of directories clang will search for headers.")
 
diff --git a/include/clang/Config/config.h.cmake b/include/clang/Config/config.h.cmake
index 5f13d2faa3..993bbc98b7 100644
--- a/include/clang/Config/config.h.cmake
+++ b/include/clang/Config/config.h.cmake
@@ -1,6 +1,18 @@
 /* Relative directory for resource files */
 #define CLANG_RESOURCE_DIR "${CLANG_RESOURCE_DIR}"
 
+/* GCC install root */
+#define CLANG_GCC_INSTALL_ROOT "${CLANG_GCC_INSTALL_ROOT}"
+
+/* GCC library directory, relative to the installation root */
+#define CLANG_GCC_LIB_DIR "${CLANG_GCC_LIB_DIR}"
+
+/* GCC architecture */
+#define CLANG_GCC_ARCH "${CLANG_GCC_ARCH}"
+
+/* GCC version */
+#define CLANG_GCC_VERSION "${CLANG_GCC_VERSION}"
+
 /* 32 bit multilib directory. */
 #define CXX_INCLUDE_32BIT_DIR "${CXX_INCLUDE_32BIT_DIR}"
 
diff --git a/lib/Driver/ToolChains.cpp b/lib/Driver/ToolChains.cpp
index ca613e3d6c..5266f6a883 100644
--- a/lib/Driver/ToolChains.cpp
+++ b/lib/Driver/ToolChains.cpp
@@ -1334,31 +1334,27 @@ static LinuxDistro DetectLinuxDistro(llvm::Triple::ArchType Arch) {
 }
 
 static std::string findGCCBaseLibDir(const std::string &GccTriple) {
-  // FIXME: Using CXX_INCLUDE_ROOT is here is a bit of a hack, but
-  // avoids adding yet another option to configure/cmake.
-  // It would probably be cleaner to break it in two variables
-  // CXX_GCC_ROOT with just /foo/bar
-  // CXX_GCC_VER with 4.5.2
-  // Then we would have
-  // CXX_INCLUDE_ROOT = CXX_GCC_ROOT/include/c++/CXX_GCC_VER
-  // and this function would return
-  // CXX_GCC_ROOT/lib/gcc/CXX_INCLUDE_ARCH/CXX_GCC_VER
-  llvm::SmallString<128> CxxIncludeRoot(CXX_INCLUDE_ROOT);
-  if (CxxIncludeRoot != "") {
-    // This is of the form /foo/bar/include/c++/4.5.2/
-    if (CxxIncludeRoot.back() == '/')
-      llvm::sys::path::remove_filename(CxxIncludeRoot); // remove the /
-    llvm::StringRef Version = llvm::sys::path::filename(CxxIncludeRoot);
-    llvm::sys::path::remove_filename(CxxIncludeRoot); // remove the version
-    llvm::sys::path::remove_filename(CxxIncludeRoot); // remove the c++
-    llvm::sys::path::remove_filename(CxxIncludeRoot); // remove the include
-    std::string ret(CxxIncludeRoot.c_str());
-    ret.append("/lib/gcc/");
-    ret.append(CXX_INCLUDE_ARCH);
-    ret.append("/");
-    ret.append(Version);
-    return ret;
+  // Check for an explicit configure-time version of GCC.
+  llvm::SmallString<32> GCCVersion(CLANG_GCC_VERSION);
+  if (GCCVersion != "") {
+    // Read the other variables if we have a specific GCC version requested at
+    // configuration time. We provide defaults for them if missing though.
+    llvm::SmallString<128> InstallRoot(CLANG_GCC_INSTALL_ROOT);
+    if (InstallRoot == "") InstallRoot = "/usr";
+    llvm::SmallString<32> GCCLibDir(CLANG_GCC_LIB_DIR);
+    if (GCCLibDir == "") GCCLibDir = "/lib/gcc";
+    llvm::SmallString<32> GCCArch(CLANG_GCC_ARCH);
+    if (GCCArch == "") GCCArch = GccTriple;
+
+    InstallRoot += GCCLibDir;
+    InstallRoot += "/";
+    InstallRoot += GCCArch;
+    InstallRoot += "/";
+    InstallRoot += GCCVersion;
+    return InstallRoot.str();
   }
+
+  // Otherwise, attempt to detect a system GCC installation.
   static const char* GccVersions[] = {"4.6.0", "4.6",
                                       "4.5.2", "4.5.1", "4.5",
                                       "4.4.5", "4.4.4", "4.4.3", "4.4",
-- 
2.40.0