Use AIX version detection at LLVM run-time

Summary:
AIX compilers define macros based on the version of the operating
system.

This patch implements updating of versionless AIX triples to include the
host AIX version. Also, the host triple detection in the build system is
adjusted to strip the AIX version information so that the run-time
detection is preferred.

Reviewers: xingxue, stefanp, nemanjai, jasonliu

Reviewed By: xingxue

Subscribers: mgorny, kristina, jdoerfert, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D58798

llvm-svn: 355995

1 files changed, 91 insertions, 23 deletions

diff --git a/llvm/unittests/Support/Host.cpp b/llvm/unittests/Support/Host.cpp
index b8093171475..89080f350aa 100644
--- a/llvm/unittests/Support/Host.cpp
+++ b/llvm/unittests/Support/Host.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/Support/Host.h"
+#include "llvm/Config/llvm-config.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/Triple.h"
 #include "llvm/Support/FileSystem.h"
@@ -248,6 +249,46 @@ CPU part	: 0x0a1
             "tsv110");
 }
 
+static bool runAndGetCommandOutput(
+    const char *ExePath, ArrayRef<llvm::StringRef> argv,
+    std::unique_ptr<char[]> &Buffer, off_t &Size) {
+  bool Success = false;
+  [ExePath, argv, &Buffer, &Size, &Success] {
+    using namespace llvm::sys;
+    SmallString<128> TestDirectory;
+    ASSERT_NO_ERROR(fs::createUniqueDirectory("host_test", TestDirectory));
+
+    SmallString<128> OutputFile(TestDirectory);
+    path::append(OutputFile, "out");
+    StringRef OutputPath = OutputFile.str();
+
+    const Optional<StringRef> Redirects[] = {
+        /*STDIN=*/None, /*STDOUT=*/OutputPath, /*STDERR=*/None};
+    int RetCode = ExecuteAndWait(ExePath, argv, /*env=*/llvm::None, Redirects);
+    ASSERT_EQ(0, RetCode);
+
+    int FD = 0;
+    ASSERT_NO_ERROR(fs::openFileForRead(OutputPath, FD));
+    Size = ::lseek(FD, 0, SEEK_END);
+    ASSERT_NE(-1, Size);
+    ::lseek(FD, 0, SEEK_SET);
+    Buffer = llvm::make_unique<char[]>(Size);
+    ASSERT_EQ(::read(FD, Buffer.get(), Size), Size);
+    ::close(FD);
+
+    ASSERT_NO_ERROR(fs::remove(OutputPath));
+    ASSERT_NO_ERROR(fs::remove(TestDirectory.str()));
+    Success = true;
+  }();
+  return Success;
+}
+
+TEST_F(HostTest, DummyRunAndGetCommandOutputUse) {
+  // Suppress defined-but-not-used warnings when the tests using the helper are
+  // disabled.
+  (void) runAndGetCommandOutput;
+}
+
 #if defined(__APPLE__)
 TEST_F(HostTest, getMacOSHostVersion) {
   using namespace llvm::sys;
@@ -255,31 +296,14 @@ TEST_F(HostTest, getMacOSHostVersion) {
   if (!HostTriple.isMacOSX())
     return;
 
-  SmallString<128> TestDirectory;
-  ASSERT_NO_ERROR(fs::createUniqueDirectory("host_test", TestDirectory));
-  SmallString<128> OutputFile(TestDirectory);
-  path::append(OutputFile, "out");
-
   const char *SwVersPath = "/usr/bin/sw_vers";
   StringRef argv[] = {SwVersPath, "-productVersion"};
-  StringRef OutputPath = OutputFile.str();
-  const Optional<StringRef> Redirects[] = {/*STDIN=*/None,
-                                           /*STDOUT=*/OutputPath,
-                                           /*STDERR=*/None};
-  int RetCode = ExecuteAndWait(SwVersPath, argv, /*env=*/llvm::None, Redirects);
-  ASSERT_EQ(0, RetCode);
-
-  int FD = 0;
-  ASSERT_NO_ERROR(fs::openFileForRead(OutputPath, FD));
-  off_t Size = ::lseek(FD, 0, SEEK_END);
-  ASSERT_NE(-1, Size);
-  ::lseek(FD, 0, SEEK_SET);
-  std::unique_ptr<char[]> Buffer = llvm::make_unique<char[]>(Size);
-  ASSERT_EQ(::read(FD, Buffer.get(), Size), Size);
-  ::close(FD);
+  std::unique_ptr<char[]> Buffer;
+  off_t Size;
+  ASSERT_EQ(runAndGetCommandOutput(SwVersPath, argv, Buffer, Size), true);
+  StringRef SystemVersion(Buffer.get(), Size);
 
   // Ensure that the two versions match.
-  StringRef SystemVersion(Buffer.get(), Size);
   unsigned SystemMajor, SystemMinor, SystemMicro;
   ASSERT_EQ(llvm::Triple((Twine("x86_64-apple-macos") + SystemVersion))
                 .getMacOSXVersion(SystemMajor, SystemMinor, SystemMicro),
@@ -290,8 +314,52 @@ TEST_F(HostTest, getMacOSHostVersion) {
   // Don't compare the 'Micro' version, as it's always '0' for the 'Darwin'
   // triples.
   ASSERT_EQ(std::tie(SystemMajor, SystemMinor), std::tie(HostMajor, HostMinor));
+}
+#endif
+
+#if defined(_AIX)
+TEST_F(HostTest, AIXVersionDetect) {
+  using namespace llvm::sys;
+
+  llvm::Triple HostTriple(getProcessTriple());
+  ASSERT_EQ(HostTriple.getOS(), Triple::AIX);
+
+  llvm::Triple ConfiguredHostTriple(LLVM_HOST_TRIPLE);
+  ASSERT_EQ(ConfiguredHostTriple.getOS(), Triple::AIX);
+
+  const char *ExePath = "/usr/bin/oslevel";
+  StringRef argv[] = {ExePath};
+  std::unique_ptr<char[]> Buffer;
+  off_t Size;
+  ASSERT_EQ(runAndGetCommandOutput(ExePath, argv, Buffer, Size), true);
+  StringRef SystemVersion(Buffer.get(), Size);
+
+  unsigned SystemMajor, SystemMinor, SystemMicro;
+  llvm::Triple((Twine("powerpc-ibm-aix") + SystemVersion))
+      .getOSVersion(SystemMajor, SystemMinor, SystemMicro);
+
+  // Ensure that the host triple version (major) and release (minor) numbers,
+  // unless explicitly configured, match with those of the current system.
+  if (!ConfiguredHostTriple.getOSMajorVersion()) {
+    unsigned HostMajor, HostMinor, HostMicro;
+    HostTriple.getOSVersion(HostMajor, HostMinor, HostMicro);
+    ASSERT_EQ(std::tie(SystemMajor, SystemMinor),
+              std::tie(HostMajor, HostMinor));
+  }
+
+  llvm::Triple TargetTriple(getDefaultTargetTriple());
+  if (TargetTriple.getOS() != Triple::AIX)
+    return;
+
+  // Ensure that the target triple version (major) and release (minor) numbers
+  // match with those of the current system.
+  llvm::Triple ConfiguredTargetTriple(LLVM_DEFAULT_TARGET_TRIPLE);
+  if (ConfiguredTargetTriple.getOSMajorVersion())
+    return; // The version was configured explicitly; skip.
 
-  ASSERT_NO_ERROR(fs::remove(OutputPath));
-  ASSERT_NO_ERROR(fs::remove(TestDirectory.str()));
+  unsigned TargetMajor, TargetMinor, TargetMicro;
+  TargetTriple.getOSVersion(TargetMajor, TargetMinor, TargetMicro);
+  ASSERT_EQ(std::tie(SystemMajor, SystemMinor),
+            std::tie(TargetMajor, TargetMinor));
 }
 #endif