From 72db2abcc794feccfb482d4ae9e500c91c8bcb45 Mon Sep 17 00:00:00 2001
From: Hubert Tong <hubert.reinterpretcast@gmail.com>
Date: Wed, 13 Mar 2019 00:12:43 +0000
Subject: 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
---
 llvm/lib/Support/Unix/Host.inc | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

(limited to 'llvm/lib/Support')

diff --git a/llvm/lib/Support/Unix/Host.inc b/llvm/lib/Support/Unix/Host.inc
index 4ae261aa8cf..17d78dc18be 100644
--- a/llvm/lib/Support/Unix/Host.inc
+++ b/llvm/lib/Support/Unix/Host.inc
@@ -49,6 +49,23 @@ static std::string updateTripleOSVersion(std::string TargetTripleString) {
     TargetTripleString += "-darwin";
     TargetTripleString += getOSVersion();
   }
+  // On AIX, the AIX version and release should be that of the current host
+  // unless if the version has already been specified.
+  if (Triple(LLVM_HOST_TRIPLE).getOS() == Triple::AIX) {
+    Triple TT(TargetTripleString);
+    if (TT.getOS() == Triple::AIX && !TT.getOSMajorVersion()) {
+      struct utsname name;
+      if (uname(&name) != -1) {
+        std::string NewOSName = Triple::getOSTypeName(Triple::AIX);
+        NewOSName += name.version;
+        NewOSName += '.';
+        NewOSName += name.release;
+        NewOSName += ".0.0";
+        TT.setOSName(NewOSName);
+        return TT.str();
+      }
+    }
+  }
   return TargetTripleString;
 }
 
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