Teach the Linux toolchain about more modern Gentoo installations of GCC
which add another wrinkle to the installation of the libstdc++ headers.
Add at least some basic testing of the weirdnesses of Gentoo's layout.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@189212 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Driver/linux-header-search.cpp b/test/Driver/linux-header-search.cpp
index 788694f..8955ed7 100644
--- a/test/Driver/linux-header-search.cpp
+++ b/test/Driver/linux-header-search.cpp
@@ -115,3 +115,32 @@
// CHECK-DEBIAN-PPC64: "-internal-externc-isystem" "[[SYSROOT]]/usr/include/powerpc64-linux-gnu"
// CHECK-DEBIAN-PPC64: "-internal-externc-isystem" "[[SYSROOT]]/include"
// CHECK-DEBIAN-PPC64: "-internal-externc-isystem" "[[SYSROOT]]/usr/include"
+//
+// Test Gentoo's weirdness both before and after they changed it in their GCC
+// 4.6.4 release.
+// RUN: %clang -no-canonical-prefixes %s -### -fsyntax-only 2>&1 \
+// RUN: -target x86_64-unknown-linux-gnu \
+// RUN: --sysroot=%S/Inputs/gentoo_linux_gcc_4.6.2_tree \
+// RUN: | FileCheck --check-prefix=CHECK-GENTOO-4-6-2 %s
+// CHECK-GENTOO-4-6-2: "{{.*}}clang{{.*}}" "-cc1"
+// CHECK-GENTOO-4-6-2: "-isysroot" "[[SYSROOT:[^"]+]]"
+// CHECK-GENTOO-4-6-2: "-internal-isystem" "[[SYSROOT]]/usr/lib/gcc/x86_64-pc-linux-gnu/4.6.2/include/g++-v4"
+// CHECK-GENTOO-4-6-2: "-internal-isystem" "[[SYSROOT]]/usr/lib/gcc/x86_64-pc-linux-gnu/4.6.2/include/g++-v4/x86_64-pc-linux-gnu"
+// CHECK-GENTOO-4-6-2: "-internal-isystem" "[[SYSROOT]]/usr/lib/gcc/x86_64-pc-linux-gnu/4.6.2/include/g++-v4/backward"
+// CHECK-GENTOO-4-6-2: "-internal-isystem" "[[SYSROOT]]/usr/local/include"
+// CHECK-GENTOO-4-6-2: "-internal-isystem" "{{.*}}{{/|\\\\}}lib{{(64|32)?}}{{/|\\\\}}clang{{/|\\\\}}{{[0-9]\.[0-9]}}{{/|\\\\}}include"
+// CHECK-GENTOO-4-6-2: "-internal-externc-isystem" "[[SYSROOT]]/include"
+// CHECK-GENTOO-4-6-2: "-internal-externc-isystem" "[[SYSROOT]]/usr/include"
+// RUN: %clang -no-canonical-prefixes %s -### -fsyntax-only 2>&1 \
+// RUN: -target x86_64-unknown-linux-gnu \
+// RUN: --sysroot=%S/Inputs/gentoo_linux_gcc_4.6.4_tree \
+// RUN: | FileCheck --check-prefix=CHECK-GENTOO-4-6-4 %s
+// CHECK-GENTOO-4-6-4: "{{.*}}clang{{.*}}" "-cc1"
+// CHECK-GENTOO-4-6-4: "-isysroot" "[[SYSROOT:[^"]+]]"
+// CHECK-GENTOO-4-6-4: "-internal-isystem" "[[SYSROOT]]/usr/lib/gcc/x86_64-pc-linux-gnu/4.6.4/include/g++-v4.6"
+// CHECK-GENTOO-4-6-4: "-internal-isystem" "[[SYSROOT]]/usr/lib/gcc/x86_64-pc-linux-gnu/4.6.4/include/g++-v4.6/x86_64-pc-linux-gnu"
+// CHECK-GENTOO-4-6-4: "-internal-isystem" "[[SYSROOT]]/usr/lib/gcc/x86_64-pc-linux-gnu/4.6.4/include/g++-v4.6/backward"
+// CHECK-GENTOO-4-6-4: "-internal-isystem" "[[SYSROOT]]/usr/local/include"
+// CHECK-GENTOO-4-6-4: "-internal-isystem" "{{.*}}{{/|\\\\}}lib{{(64|32)?}}{{/|\\\\}}clang{{/|\\\\}}{{[0-9]\.[0-9]}}{{/|\\\\}}include"
+// CHECK-GENTOO-4-6-4: "-internal-externc-isystem" "[[SYSROOT]]/include"
+// CHECK-GENTOO-4-6-4: "-internal-externc-isystem" "[[SYSROOT]]/usr/include"