[Driver] Select newest GCC installation on Solaris

As described in Issue #53709
<https://github.com/llvm/llvm-project/issues/53709>, since
28d58d8fe2094af6902dee7b4d68ec30a3e9d737
<https://reviews.llvm.org/rG28d58d8fe2094af6902dee7b4d68ec30a3e9d737>
`clang` doesn't find the latest of several parallel GCC installations on
Solaris, but only the first in directory order, which is pretty random.

This patch sorts GCC installations in reverse version order so the latest
is picked.

Tested on `sparcv9-sun-solaris2.11`, `amd64-pc-solaris2.11`, and
`x86_64-pc-linux-gnu`.

Differential Revision: https://reviews.llvm.org/D157275

1 files changed, 149 insertions, 0 deletions

diff --git a/clang/unittests/Driver/ToolChainTest.cpp b/clang/unittests/Driver/ToolChainTest.cpp
index 8d3853a..bf61d42 100644
--- a/clang/unittests/Driver/ToolChainTest.cpp
+++ b/clang/unittests/Driver/ToolChainTest.cpp
@@ -168,6 +168,155 @@ TEST(ToolChainTest, VFSGCCInstallationRelativeDir) {
             S);
 }
 
+TEST(ToolChainTest, VFSSolarisMultiGCCInstallation) {
+  IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts = new DiagnosticOptions();
+
+  IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
+  struct TestDiagnosticConsumer : public DiagnosticConsumer {};
+  IntrusiveRefCntPtr<llvm::vfs::InMemoryFileSystem> InMemoryFileSystem(
+      new llvm::vfs::InMemoryFileSystem);
+
+  const char *EmptyFiles[] = {
+      // Sort entries so the latest version doesn't come first.
+      "/usr/gcc/7/lib/gcc/sparcv9-sun-solaris2.11/7.5.0/32/crtbegin.o",
+      "/usr/gcc/7/lib/gcc/sparcv9-sun-solaris2.11/7.5.0/crtbegin.o",
+      "/usr/gcc/7/lib/gcc/x86_64-pc-solaris2.11/7.5.0/32/crtbegin.o",
+      "/usr/gcc/7/lib/gcc/x86_64-pc-solaris2.11/7.5.0/crtbegin.o",
+      "/usr/gcc/11/lib/gcc/sparcv9-sun-solaris2.11/11.4.0/crtbegin.o",
+      "/usr/gcc/11/lib/gcc/sparcv9-sun-solaris2.11/11.4.0/sparcv8plus/"
+      "crtbegin.o",
+      "/usr/gcc/11/lib/gcc/x86_64-pc-solaris2.11/11.4.0/32/crtbegin.o",
+      "/usr/gcc/11/lib/gcc/x86_64-pc-solaris2.11/11.4.0/crtbegin.o",
+      "/usr/gcc/4.7/lib/gcc/i386-pc-solaris2.11/4.7.3/amd64/crtbegin.o",
+      "/usr/gcc/4.7/lib/gcc/i386-pc-solaris2.11/4.7.3/crtbegin.o",
+      "/usr/gcc/4.7/lib/gcc/sparc-sun-solaris2.11/4.7.3/crtbegin.o",
+      "/usr/gcc/4.7/lib/gcc/sparc-sun-solaris2.11/4.7.3/sparcv9/crtbegin.o",
+  };
+
+  for (const char *Path : EmptyFiles)
+    InMemoryFileSystem->addFile(Path, 0,
+                                llvm::MemoryBuffer::getMemBuffer("\n"));
+
+  {
+    DiagnosticsEngine Diags(DiagID, &*DiagOpts, new TestDiagnosticConsumer);
+    Driver TheDriver("/bin/clang", "i386-pc-solaris2.11", Diags,
+                     "clang LLVM compiler", InMemoryFileSystem);
+    std::unique_ptr<Compilation> C(
+        TheDriver.BuildCompilation({"-v", "--gcc-toolchain=", "--sysroot="}));
+    ASSERT_TRUE(C);
+    std::string S;
+    {
+      llvm::raw_string_ostream OS(S);
+      C->getDefaultToolChain().printVerboseInfo(OS);
+    }
+    if (is_style_windows(llvm::sys::path::Style::native))
+      std::replace(S.begin(), S.end(), '\\', '/');
+    EXPECT_EQ("Found candidate GCC installation: "
+              "/usr/gcc/11/lib/gcc/x86_64-pc-solaris2.11/11.4.0\n"
+              "Selected GCC installation: "
+              "/usr/gcc/11/lib/gcc/x86_64-pc-solaris2.11/11.4.0\n"
+              "Candidate multilib: .;@m64\n"
+              "Candidate multilib: 32;@m32\n"
+              "Selected multilib: 32;@m32\n",
+              S);
+  }
+
+  {
+    DiagnosticsEngine Diags(DiagID, &*DiagOpts, new TestDiagnosticConsumer);
+    Driver TheDriver("/bin/clang", "amd64-pc-solaris2.11", Diags,
+                     "clang LLVM compiler", InMemoryFileSystem);
+    std::unique_ptr<Compilation> C(
+        TheDriver.BuildCompilation({"-v", "--gcc-toolchain=", "--sysroot="}));
+    ASSERT_TRUE(C);
+    std::string S;
+    {
+      llvm::raw_string_ostream OS(S);
+      C->getDefaultToolChain().printVerboseInfo(OS);
+    }
+    if (is_style_windows(llvm::sys::path::Style::native))
+      std::replace(S.begin(), S.end(), '\\', '/');
+    EXPECT_EQ("Found candidate GCC installation: "
+              "/usr/gcc/11/lib/gcc/x86_64-pc-solaris2.11/11.4.0\n"
+              "Selected GCC installation: "
+              "/usr/gcc/11/lib/gcc/x86_64-pc-solaris2.11/11.4.0\n"
+              "Candidate multilib: .;@m64\n"
+              "Candidate multilib: 32;@m32\n"
+              "Selected multilib: .;@m64\n",
+              S);
+  }
+
+  {
+    DiagnosticsEngine Diags(DiagID, &*DiagOpts, new TestDiagnosticConsumer);
+    Driver TheDriver("/bin/clang", "x86_64-pc-solaris2.11", Diags,
+                     "clang LLVM compiler", InMemoryFileSystem);
+    std::unique_ptr<Compilation> C(
+        TheDriver.BuildCompilation({"-v", "--gcc-toolchain=", "--sysroot="}));
+    ASSERT_TRUE(C);
+    std::string S;
+    {
+      llvm::raw_string_ostream OS(S);
+      C->getDefaultToolChain().printVerboseInfo(OS);
+    }
+    if (is_style_windows(llvm::sys::path::Style::native))
+      std::replace(S.begin(), S.end(), '\\', '/');
+    EXPECT_EQ("Found candidate GCC installation: "
+              "/usr/gcc/11/lib/gcc/x86_64-pc-solaris2.11/11.4.0\n"
+              "Selected GCC installation: "
+              "/usr/gcc/11/lib/gcc/x86_64-pc-solaris2.11/11.4.0\n"
+              "Candidate multilib: .;@m64\n"
+              "Candidate multilib: 32;@m32\n"
+              "Selected multilib: .;@m64\n",
+              S);
+  }
+
+  {
+    DiagnosticsEngine Diags(DiagID, &*DiagOpts, new TestDiagnosticConsumer);
+    Driver TheDriver("/bin/clang", "sparc-sun-solaris2.11", Diags,
+                     "clang LLVM compiler", InMemoryFileSystem);
+    std::unique_ptr<Compilation> C(
+        TheDriver.BuildCompilation({"-v", "--gcc-toolchain=", "--sysroot="}));
+    ASSERT_TRUE(C);
+    std::string S;
+    {
+      llvm::raw_string_ostream OS(S);
+      C->getDefaultToolChain().printVerboseInfo(OS);
+    }
+    if (is_style_windows(llvm::sys::path::Style::native))
+      std::replace(S.begin(), S.end(), '\\', '/');
+    EXPECT_EQ("Found candidate GCC installation: "
+              "/usr/gcc/11/lib/gcc/sparcv9-sun-solaris2.11/11.4.0\n"
+              "Selected GCC installation: "
+              "/usr/gcc/11/lib/gcc/sparcv9-sun-solaris2.11/11.4.0\n"
+              "Candidate multilib: .;@m64\n"
+              "Candidate multilib: sparcv8plus;@m32\n"
+              "Selected multilib: sparcv8plus;@m32\n",
+              S);
+  }
+  {
+    DiagnosticsEngine Diags(DiagID, &*DiagOpts, new TestDiagnosticConsumer);
+    Driver TheDriver("/bin/clang", "sparcv9-sun-solaris2.11", Diags,
+                     "clang LLVM compiler", InMemoryFileSystem);
+    std::unique_ptr<Compilation> C(
+        TheDriver.BuildCompilation({"-v", "--gcc-toolchain=", "--sysroot="}));
+    ASSERT_TRUE(C);
+    std::string S;
+    {
+      llvm::raw_string_ostream OS(S);
+      C->getDefaultToolChain().printVerboseInfo(OS);
+    }
+    if (is_style_windows(llvm::sys::path::Style::native))
+      std::replace(S.begin(), S.end(), '\\', '/');
+    EXPECT_EQ("Found candidate GCC installation: "
+              "/usr/gcc/11/lib/gcc/sparcv9-sun-solaris2.11/11.4.0\n"
+              "Selected GCC installation: "
+              "/usr/gcc/11/lib/gcc/sparcv9-sun-solaris2.11/11.4.0\n"
+              "Candidate multilib: .;@m64\n"
+              "Candidate multilib: sparcv8plus;@m32\n"
+              "Selected multilib: .;@m64\n",
+              S);
+  }
+}
+
 TEST(ToolChainTest, DefaultDriverMode) {
   IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts = new DiagnosticOptions();