[llvm] [AIX] Add git revision to .file string (PR #88164)

[Jake Egan via llvm-commits]

https://github.com/jakeegan created https://github.com/llvm/llvm-project/pull/88164

If `LLVM_APPEND_VC_REV` is on, add the git revision to the `.file` string. The revision can be set with `LLVM_FORCE_VC_REVISION`. 

Before:
`.file	"git_revision.cpp",,"LLVM version 19.0.0git"`

After:
`.file	"git_revision.cpp",,"LLVM version 19.0.0git (LLVM_REVISION)"`

>From 4dc5015fb04cd8c3b21d02b778c653947703438f Mon Sep 17 00:00:00 2001
From: Jake Egan <jake.egan at ibm.com>
Date: Tue, 9 Apr 2024 12:41:14 -0400
Subject: [PATCH] [AIX] Add git revision to .file string

---
 llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp | 12 ++++++++----
 llvm/test/CodeGen/PowerPC/git_revision.ll  | 13 +++++++++++++
 2 files changed, 21 insertions(+), 4 deletions(-)
 create mode 100644 llvm/test/CodeGen/PowerPC/git_revision.ll

diff --git a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
index 721d144d7f4c67..1072fce89e3099 100644
--- a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -114,6 +114,7 @@
 #include "llvm/Support/MathExtras.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/Timer.h"
+#include "llvm/Support/VCSRevision.h"
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Target/TargetLoweringObjectFile.h"
 #include "llvm/Target/TargetMachine.h"
@@ -497,12 +498,15 @@ bool AsmPrinter::doInitialization(Module &M) {
     else
       FileName = M.getSourceFileName();
     if (MAI->hasFourStringsDotFile()) {
-#ifdef PACKAGE_VENDOR
       const char VerStr[] =
-          PACKAGE_VENDOR " " PACKAGE_NAME " version " PACKAGE_VERSION;
-#else
-      const char VerStr[] = PACKAGE_NAME " version " PACKAGE_VERSION;
+#ifdef PACKAGE_VENDOR
+      PACKAGE_VENDOR " "
+#endif
+      PACKAGE_NAME " version " PACKAGE_VERSION
+#ifdef LLVM_REVISION
+      " (" LLVM_REVISION ")"
 #endif
+      ;
       // TODO: Add timestamp and description.
       OutStreamer->emitFileDirective(FileName, VerStr, "", "");
     } else {
diff --git a/llvm/test/CodeGen/PowerPC/git_revision.ll b/llvm/test/CodeGen/PowerPC/git_revision.ll
new file mode 100644
index 00000000000000..280c311c8bd7c8
--- /dev/null
+++ b/llvm/test/CodeGen/PowerPC/git_revision.ll
@@ -0,0 +1,13 @@
+; Check that the git revision is contained in the assembly/object files
+
+; RUN: cd %S && git rev-parse HEAD > %t
+
+; RUN: llc < %s > %t.a.o
+; RUN: sed -n -e "/$(cat %t)/p" %t.a.o
+
+; RUN: llc -filetype=obj < %s > %t.b.o
+; RUN: sed -n -e "/$(cat %t)/p" %t.b.o
+
+source_filename = "git_revision.cpp"
+target datalayout = "E-m:a-Fi64-i64:64-n32:64-S128-v256:256:256-v512:512:512"
+target triple = "powerpc64-ibm-aix7.2.0.0"