[Driver] Fix finding multilib gcc install on Gentoo (with gcc-config)

Fix the gcc-config code to support multilib gcc installs properly. This
solves two problems: -mx32 using the 64-bit gcc directory (due to matching
installation triple), and -m32 not respecting gcc-config at all (due to
mismatched installation triple).

In order to fix the former issue, split the multilib scan out of
Generic_GCC::GCCInstallationDetector::ScanLibDirForGCCTriple() (the code
is otherwise unchanged), and call it for each installation found via
gcc-config.

In order to fix the latter issue, split the gcc-config processing out of
Generic_GCC::GCCInstallationDetector::init() and repeat it for all
triples, including extra and biarch triples. The only change
in the gcc-config code itself is adding the call to multilib scan.

Convert the gentoo_linux_gcc_multi_version_tree test input to multilib
x86_64+32+x32 install, and add appropriate tests to linux-header-search
and linux-ld.

Differential Revision: https://reviews.llvm.org/D26887

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@289436 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 33 insertions, 0 deletions

diff --git a/test/Driver/linux-header-search.cpp b/test/Driver/linux-header-search.cpp
index 491bb4d0e2..274895fb4f 100644
--- a/test/Driver/linux-header-search.cpp
+++ b/test/Driver/linux-header-search.cpp
@@ -310,6 +310,39 @@
 // RUN:     --gcc-toolchain="" \
 // RUN:   | FileCheck --check-prefix=CHECK-GENTOO-4-9-3 %s
 //
+// Test that gcc-config support does not break multilib.
+// RUN: %clang -no-canonical-prefixes %s -### -fsyntax-only 2>&1 \
+// RUN:     -target x86_64-unknown-linux-gnux32 -stdlib=libstdc++ \
+// RUN:     --sysroot=%S/Inputs/gentoo_linux_gcc_multi_version_tree \
+// RUN:     --gcc-toolchain="" \
+// RUN:   | FileCheck --check-prefix=CHECK-GENTOO-4-9-3-X32 %s
+// CHECK-GENTOO-4-9-3-X32: "{{.*}}clang{{.*}}" "-cc1"
+// CHECK-GENTOO-4-9-3-X32: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
+// CHECK-GENTOO-4-9-3-X32: "-isysroot" "[[SYSROOT:[^"]+]]"
+// CHECK-GENTOO-4-9-3-X32: "-internal-isystem" "[[SYSROOT]]/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.3/include/g++-v4.9.3"
+// CHECK-GENTOO-4-9-3-X32: "-internal-isystem" "[[SYSROOT]]/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.3/include/g++-v4.9.3/x86_64-pc-linux-gnu/x32"
+// CHECK-GENTOO-4-9-3-X32: "-internal-isystem" "[[SYSROOT]]/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.3/include/g++-v4.9.3/backward"
+// CHECK-GENTOO-4-9-3-X32: "-internal-isystem" "[[SYSROOT]]/usr/local/include"
+// CHECK-GENTOO-4-9-3-X32: "-internal-isystem" "[[RESOURCE_DIR]]{{/|\\\\}}include"
+// CHECK-GENTOO-4-9-3-X32: "-internal-externc-isystem" "[[SYSROOT]]/include"
+// CHECK-GENTOO-4-9-3-X32: "-internal-externc-isystem" "[[SYSROOT]]/usr/include"
+//
+// RUN: %clang -no-canonical-prefixes %s -### -fsyntax-only 2>&1 \
+// RUN:     -target i386-unknown-linux-gnu -stdlib=libstdc++ \
+// RUN:     --sysroot=%S/Inputs/gentoo_linux_gcc_multi_version_tree \
+// RUN:     --gcc-toolchain="" \
+// RUN:   | FileCheck --check-prefix=CHECK-GENTOO-4-9-3-32 %s
+// CHECK-GENTOO-4-9-3-32: "{{.*}}clang{{.*}}" "-cc1"
+// CHECK-GENTOO-4-9-3-32: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
+// CHECK-GENTOO-4-9-3-32: "-isysroot" "[[SYSROOT:[^"]+]]"
+// CHECK-GENTOO-4-9-3-32: "-internal-isystem" "[[SYSROOT]]/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.3/include/g++-v4.9.3"
+// CHECK-GENTOO-4-9-3-32: "-internal-isystem" "[[SYSROOT]]/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.3/include/g++-v4.9.3/x86_64-pc-linux-gnu/32"
+// CHECK-GENTOO-4-9-3-32: "-internal-isystem" "[[SYSROOT]]/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.3/include/g++-v4.9.3/backward"
+// CHECK-GENTOO-4-9-3-32: "-internal-isystem" "[[SYSROOT]]/usr/local/include"
+// CHECK-GENTOO-4-9-3-32: "-internal-isystem" "[[RESOURCE_DIR]]{{/|\\\\}}include"
+// CHECK-GENTOO-4-9-3-32: "-internal-externc-isystem" "[[SYSROOT]]/include"
+// CHECK-GENTOO-4-9-3-32: "-internal-externc-isystem" "[[SYSROOT]]/usr/include"
+//
 // Check header search on Debian 6 / MIPS64
 // RUN: %clang -no-canonical-prefixes %s -### -fsyntax-only 2>&1 \
 // RUN:     -target mips64-unknown-linux-gnuabi64 -stdlib=libstdc++ \