From ca80c2438697dd10c60e11c07d68e3b784013b93 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ra=C3=BAl=20Pe=C3=B1acoba?= <raul.penacoba@bsc.es>
Date: Fri, 25 Feb 2022 04:41:02 +0000
Subject: [PATCH] [Driver] Support GCC detection for GCC compiled with
 --enable-version-specific-runtime-libs

GCC's compiled with --enable-version-specific-runtime-libs change the paths where includes and libs are found.
This patch adds support for these cases

Reviewed By: MaskRay

Differential Revision: https://reviews.llvm.org/D118700
---
 clang/lib/Driver/ToolChains/Gnu.cpp           | 14 ++++++++++++
 .../gcc/x86_64-redhat-linux/10.2.0/crtbegin.o |  0
 .../10.2.0/include/c++/.keep                  |  0
 .../lib/gcc/x86_64-redhat-linux/lib64/.keep   |  0
 .../x86_64-redhat-linux/10.2.0/32/crtbegin.o  |  0
 .../gcc/x86_64-redhat-linux/10.2.0/crtbegin.o |  0
 .../10.2.0/include/c++/.keep                  |  0
 .../lib/gcc/x86_64-redhat-linux/lib32/.keep   |  0
 .../lib/gcc/x86_64-redhat-linux/lib64/.keep   |  0
 .../Driver/gcc-toolchain-rt-libs-multi.cpp    | 22 +++++++++++++++++++
 clang/test/Driver/gcc-toolchain-rt-libs.cpp   | 12 ++++++++++
 11 files changed, 48 insertions(+)
 create mode 100644 clang/test/Driver/Inputs/gcc_version_parsing_rt_libs/lib/gcc/x86_64-redhat-linux/10.2.0/crtbegin.o
 create mode 100644 clang/test/Driver/Inputs/gcc_version_parsing_rt_libs/lib/gcc/x86_64-redhat-linux/10.2.0/include/c++/.keep
 create mode 100644 clang/test/Driver/Inputs/gcc_version_parsing_rt_libs/lib/gcc/x86_64-redhat-linux/lib64/.keep
 create mode 100644 clang/test/Driver/Inputs/gcc_version_parsing_rt_libs_multilib/lib/gcc/x86_64-redhat-linux/10.2.0/32/crtbegin.o
 create mode 100644 clang/test/Driver/Inputs/gcc_version_parsing_rt_libs_multilib/lib/gcc/x86_64-redhat-linux/10.2.0/crtbegin.o
 create mode 100644 clang/test/Driver/Inputs/gcc_version_parsing_rt_libs_multilib/lib/gcc/x86_64-redhat-linux/10.2.0/include/c++/.keep
 create mode 100644 clang/test/Driver/Inputs/gcc_version_parsing_rt_libs_multilib/lib/gcc/x86_64-redhat-linux/lib32/.keep
 create mode 100644 clang/test/Driver/Inputs/gcc_version_parsing_rt_libs_multilib/lib/gcc/x86_64-redhat-linux/lib64/.keep
 create mode 100644 clang/test/Driver/gcc-toolchain-rt-libs-multi.cpp
 create mode 100644 clang/test/Driver/gcc-toolchain-rt-libs.cpp

diff --git a/clang/lib/Driver/ToolChains/Gnu.cpp b/clang/lib/Driver/ToolChains/Gnu.cpp
index d0808d061c82..bb3cba6dc4f7 100644
--- a/clang/lib/Driver/ToolChains/Gnu.cpp
+++ b/clang/lib/Driver/ToolChains/Gnu.cpp
@@ -2803,6 +2803,11 @@ void Generic_GCC::AddMultilibPaths(const Driver &D,
         D, GCCInstallation.getInstallPath() + SelectedMultilib.gccSuffix(),
         Paths);
 
+    // Add lib/gcc/$triple/$libdir
+    // For GCC built with --enable-version-specific-runtime-libs.
+    addPathIfExists(D, GCCInstallation.getInstallPath() + "/../" + OSLibDir,
+                    Paths);
+
     // GCC cross compiling toolchains will install target libraries which ship
     // as part of the toolchain under <prefix>/<triple>/<libdir> rather than as
     // any part of the GCC installation in
@@ -2981,6 +2986,15 @@ bool Generic_GCC::addGCCLibStdCxxIncludePaths(
           TripleStr, Multilib.includeSuffix(), DriverArgs, CC1Args))
     return true;
 
+  // Try /gcc/$triple/$version/include/c++/ (gcc --print-multiarch is not
+  // empty). Like above but for GCC built with
+  // --enable-version-specific-runtime-libs.
+  if (addLibStdCXXIncludePaths(LibDir.str() + "/gcc/" + TripleStr + "/" +
+                                   Version.Text + "/include/c++/",
+                               TripleStr, Multilib.includeSuffix(), DriverArgs,
+                               CC1Args))
+    return true;
+
   // Detect Debian g++-multiarch-incdir.diff.
   if (addLibStdCXXIncludePaths(LibDir.str() + "/../include/c++/" + Version.Text,
                                DebianMultiarch, Multilib.includeSuffix(),
diff --git a/clang/test/Driver/Inputs/gcc_version_parsing_rt_libs/lib/gcc/x86_64-redhat-linux/10.2.0/crtbegin.o b/clang/test/Driver/Inputs/gcc_version_parsing_rt_libs/lib/gcc/x86_64-redhat-linux/10.2.0/crtbegin.o
new file mode 100644
index 000000000000..e69de29bb2d1
diff --git a/clang/test/Driver/Inputs/gcc_version_parsing_rt_libs/lib/gcc/x86_64-redhat-linux/10.2.0/include/c++/.keep b/clang/test/Driver/Inputs/gcc_version_parsing_rt_libs/lib/gcc/x86_64-redhat-linux/10.2.0/include/c++/.keep
new file mode 100644
index 000000000000..e69de29bb2d1
diff --git a/clang/test/Driver/Inputs/gcc_version_parsing_rt_libs/lib/gcc/x86_64-redhat-linux/lib64/.keep b/clang/test/Driver/Inputs/gcc_version_parsing_rt_libs/lib/gcc/x86_64-redhat-linux/lib64/.keep
new file mode 100644
index 000000000000..e69de29bb2d1
diff --git a/clang/test/Driver/Inputs/gcc_version_parsing_rt_libs_multilib/lib/gcc/x86_64-redhat-linux/10.2.0/32/crtbegin.o b/clang/test/Driver/Inputs/gcc_version_parsing_rt_libs_multilib/lib/gcc/x86_64-redhat-linux/10.2.0/32/crtbegin.o
new file mode 100644
index 000000000000..e69de29bb2d1
diff --git a/clang/test/Driver/Inputs/gcc_version_parsing_rt_libs_multilib/lib/gcc/x86_64-redhat-linux/10.2.0/crtbegin.o b/clang/test/Driver/Inputs/gcc_version_parsing_rt_libs_multilib/lib/gcc/x86_64-redhat-linux/10.2.0/crtbegin.o
new file mode 100644
index 000000000000..e69de29bb2d1
diff --git a/clang/test/Driver/Inputs/gcc_version_parsing_rt_libs_multilib/lib/gcc/x86_64-redhat-linux/10.2.0/include/c++/.keep b/clang/test/Driver/Inputs/gcc_version_parsing_rt_libs_multilib/lib/gcc/x86_64-redhat-linux/10.2.0/include/c++/.keep
new file mode 100644
index 000000000000..e69de29bb2d1
diff --git a/clang/test/Driver/Inputs/gcc_version_parsing_rt_libs_multilib/lib/gcc/x86_64-redhat-linux/lib32/.keep b/clang/test/Driver/Inputs/gcc_version_parsing_rt_libs_multilib/lib/gcc/x86_64-redhat-linux/lib32/.keep
new file mode 100644
index 000000000000..e69de29bb2d1
diff --git a/clang/test/Driver/Inputs/gcc_version_parsing_rt_libs_multilib/lib/gcc/x86_64-redhat-linux/lib64/.keep b/clang/test/Driver/Inputs/gcc_version_parsing_rt_libs_multilib/lib/gcc/x86_64-redhat-linux/lib64/.keep
new file mode 100644
index 000000000000..e69de29bb2d1
diff --git a/clang/test/Driver/gcc-toolchain-rt-libs-multi.cpp b/clang/test/Driver/gcc-toolchain-rt-libs-multi.cpp
new file mode 100644
index 000000000000..378b80a9709e
--- /dev/null
+++ b/clang/test/Driver/gcc-toolchain-rt-libs-multi.cpp
@@ -0,0 +1,22 @@
+// RUN: %clangxx %s -### -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/gcc_version_parsing_rt_libs_multilib --target=x86_64-redhat-linux 2>&1 | FileCheck %s -check-prefix=X64-STDCPLUS
+// RUN: %clangxx %s -### -stdlib=libc++ --gcc-toolchain=%S/Inputs/gcc_version_parsing_rt_libs_multilib --target=x86_64-redhat-linux 2>&1 | FileCheck %s -check-prefix=X64-LIBCPLUS
+// RUN: %clangxx %s -m32 -### -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/gcc_version_parsing_rt_libs_multilib --target=x86_64-redhat-linux 2>&1 | FileCheck %s -check-prefix=X32-STDCPLUS
+// RUN: %clangxx %s -m32 -### -stdlib=libc++ --gcc-toolchain=%S/Inputs/gcc_version_parsing_rt_libs_multilib --target=x86_64-redhat-linux 2>&1 | FileCheck %s -check-prefix=X32-LIBCPLUS
+
+int main() {}
+
+// X64-STDCPLUS: "-internal-isystem" "{{[^ ]*}}gcc_version_parsing_rt_libs_multilib/lib/gcc/x86_64-redhat-linux/10.2.0/../../../gcc/x86_64-redhat-linux/10.2.0/include/c++/"
+// X64-STDCPLUS: "-L{{[^ ]*}}gcc_version_parsing_rt_libs_multilib/lib/gcc/x86_64-redhat-linux/10.2.0"
+// X64-STDCPLUS: "-L{{[^ ]*}}gcc_version_parsing_rt_libs_multilib/lib/gcc/x86_64-redhat-linux/10.2.0/../lib64"
+
+// X64-LIBCPLUS-NOT: "-internal-isystem" "{{[^ ]*}}gcc_version_parsing_rt_libs_multilib/lib/gcc/x86_64-redhat-linux/10.2.0/../../../gcc/x86_64-redhat-linux/10.2.0/include/c++/"
+// X64-LIBCPLUS: "-L{{[^ ]*}}gcc_version_parsing_rt_libs_multilib/lib/gcc/x86_64-redhat-linux/10.2.0"
+// X64-LIBCPLUS: "-L{{[^ ]*}}gcc_version_parsing_rt_libs_multilib/lib/gcc/x86_64-redhat-linux/10.2.0/../lib64"
+
+// X32-STDCPLUS: "-internal-isystem" "{{[^ ]*}}gcc_version_parsing_rt_libs_multilib/lib/gcc/x86_64-redhat-linux/10.2.0/../../../gcc/x86_64-redhat-linux/10.2.0/include/c++/"
+// X32-STDCPLUS: "-L{{[^ ]*}}gcc_version_parsing_rt_libs_multilib/lib/gcc/x86_64-redhat-linux/10.2.0/32"
+// X32-STDCPLUS: "-L{{[^ ]*}}gcc_version_parsing_rt_libs_multilib/lib/gcc/x86_64-redhat-linux/10.2.0/../lib32"
+
+// X32-LIBCPLUS-NOT: "-internal-isystem" "{{[^ ]*}}gcc_version_parsing_rt_libs_multilib/lib/gcc/x86_64-redhat-linux/10.2.0/../../../gcc/x86_64-redhat-linux/10.2.0/include/c++/"
+// X32-LIBCPLUS: "-L{{[^ ]*}}gcc_version_parsing_rt_libs_multilib/lib/gcc/x86_64-redhat-linux/10.2.0/32"
+// X32-LIBCPLUS: "-L{{[^ ]*}}gcc_version_parsing_rt_libs_multilib/lib/gcc/x86_64-redhat-linux/10.2.0/../lib32"
diff --git a/clang/test/Driver/gcc-toolchain-rt-libs.cpp b/clang/test/Driver/gcc-toolchain-rt-libs.cpp
new file mode 100644
index 000000000000..3d951ffcd0fd
--- /dev/null
+++ b/clang/test/Driver/gcc-toolchain-rt-libs.cpp
@@ -0,0 +1,12 @@
+// RUN: %clangxx %s -### -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/gcc_version_parsing_rt_libs --target=x86_64-redhat-linux 2>&1 | FileCheck %s -check-prefix=STDCPLUS
+// RUN: %clangxx %s -### -stdlib=libc++ --gcc-toolchain=%S/Inputs/gcc_version_parsing_rt_libs --target=x86_64-redhat-linux 2>&1 | FileCheck %s -check-prefix=LIBCPLUS
+
+int main() {}
+
+// STDCPLUS: "-internal-isystem" "{{[^ ]*}}gcc_version_parsing_rt_libs/lib/gcc/x86_64-redhat-linux/10.2.0/../../../gcc/x86_64-redhat-linux/10.2.0/include/c++/"
+// STDCPLUS: "-L{{.*}}gcc_version_parsing_rt_libs/lib/gcc/x86_64-redhat-linux/10.2.0"
+// STDCPLUS: "-L{{.*}}gcc_version_parsing_rt_libs/lib/gcc/x86_64-redhat-linux/10.2.0/../lib64"
+
+// LIBCPLUS-NOT: "-internal-isystem" "{{[^ ]*}}gcc_version_parsing_rt_libs/lib/gcc/x86_64-redhat-linux/10.2.0/../../../gcc/x86_64-redhat-linux/10.2.0/include/c++/"
+// LIBCPLUS: "-L{{.*}}gcc_version_parsing_rt_libs/lib/gcc/x86_64-redhat-linux/10.2.0"
+// LIBCPLUS: "-L{{.*}}gcc_version_parsing_rt_libs/lib/gcc/x86_64-redhat-linux/10.2.0/../lib64"