[clang] need to pass executable name as arg[0] (PR #114067)

[Sean Perry via cfe-commits]

https://github.com/perry-ca created https://github.com/llvm/llvm-project/pull/114067

PR https://github.com/llvm/llvm-project/pull/111976 was enabling the tests updated in the PR to run on all systems.  We found a few didn't run on z/OS.  I tracked the problem down to:
1. the ExecuteToolChainProgram() function wasn't passing the executable name as the first arg.  That was causing exec on z/OS to fail.
2. the temp file needs to be a text file so codepage conversion happens.

>From a32c4396250b8dbbf18829988ddca4b76db1ae81 Mon Sep 17 00:00:00 2001
From: Sean Perry <perry at ca.ibm.com>
Date: Tue, 29 Oct 2024 09:42:14 -0500
Subject: [PATCH] need to pass executable name as arg[0]

---
 clang/lib/Driver/ToolChain.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/clang/lib/Driver/ToolChain.cpp b/clang/lib/Driver/ToolChain.cpp
index 34de0043ca012a..bdf3da0c96adca 100644
--- a/clang/lib/Driver/ToolChain.cpp
+++ b/clang/lib/Driver/ToolChain.cpp
@@ -109,7 +109,8 @@ ToolChain::ToolChain(const Driver &D, const llvm::Triple &T,
 llvm::Expected<std::unique_ptr<llvm::MemoryBuffer>>
 ToolChain::executeToolChainProgram(StringRef Executable) const {
   llvm::SmallString<64> OutputFile;
-  llvm::sys::fs::createTemporaryFile("toolchain-program", "txt", OutputFile);
+  llvm::sys::fs::createTemporaryFile("toolchain-program", "txt", OutputFile,
+                                     llvm::sys::fs::OF_Text);
   llvm::FileRemover OutputRemover(OutputFile.c_str());
   std::optional<llvm::StringRef> Redirects[] = {
       {""},
@@ -128,7 +129,8 @@ ToolChain::executeToolChainProgram(StringRef Executable) const {
                                          *Str + "'");
     SecondsToWait = std::max(SecondsToWait, 0); // infinite
   }
-  if (llvm::sys::ExecuteAndWait(Executable, {}, {}, Redirects, SecondsToWait,
+  if (llvm::sys::ExecuteAndWait(Executable, {Executable}, {}, Redirects,
+                                SecondsToWait,
                                 /*MemoryLimit=*/0, &ErrorMessage))
     return llvm::createStringError(std::error_code(),
                                    Executable + ": " + ErrorMessage);