[flang-commits] [flang] [flang] Pass Argv0 to getIntriniscDir and getOpenMPHeadersDir (PR #73254)

[via flang-commits]

https://github.com/madanial0 created https://github.com/llvm/llvm-project/pull/73254

The `llvm::sys::fs::getMainExecutable(nullptr, nullptr)` is not able to obtain the correct executable path on AIX without Argv0 due to the lack of a current process on AIX's  `proc` filesystem. This causes a build failure on AIX as intrinsic module directory is missing. 

>From 81d1e05dd084dd5bb88dab88d2f23008b8dc6cfb Mon Sep 17 00:00:00 2001
From: Mark Danial <madanial at dixon.rtp.raleigh.ibm.com>
Date: Tue, 21 Nov 2023 12:18:40 -0500
Subject: [PATCH] Pass the correct path to getIntriniscDir and
 getOpenMPHeadersDir

---
 .../include/flang/Frontend/CompilerInvocation.h  |  6 ++++++
 flang/lib/Frontend/CompilerInvocation.cpp        | 16 ++++++++++------
 2 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/flang/include/flang/Frontend/CompilerInvocation.h b/flang/include/flang/Frontend/CompilerInvocation.h
index 229aa75748f725d..b345806586e04ef 100644
--- a/flang/include/flang/Frontend/CompilerInvocation.h
+++ b/flang/include/flang/Frontend/CompilerInvocation.h
@@ -101,6 +101,8 @@ class CompilerInvocation : public CompilerInvocationBase {
 
   bool warnAsErr = false;
 
+  const char *argv0;
+
   /// This flag controls the unparsing and is used to decide whether to print
   /// out the semantically analyzed version of an object or expression or the
   /// plain version that does not include any information from semantic
@@ -190,6 +192,8 @@ class CompilerInvocation : public CompilerInvocationBase {
     return enableConformanceChecks;
   }
 
+  const char *getArgv0() { return argv0; }
+
   bool &getEnableUsageChecks() { return enableUsageChecks; }
   const bool &getEnableUsageChecks() const { return enableUsageChecks; }
 
@@ -223,6 +227,8 @@ class CompilerInvocation : public CompilerInvocationBase {
   void setEnableUsageChecks() { enableUsageChecks = true; }
 
   /// Useful setters
+  void setArgv0(const char *dir) { argv0 = dir; }
+
   void setModuleDir(std::string &dir) { moduleDir = dir; }
 
   void setModuleFileSuffix(const char *suffix) {
diff --git a/flang/lib/Frontend/CompilerInvocation.cpp b/flang/lib/Frontend/CompilerInvocation.cpp
index cb4f2d6a6225205..2afea5ad6b9d97c 100644
--- a/flang/lib/Frontend/CompilerInvocation.cpp
+++ b/flang/lib/Frontend/CompilerInvocation.cpp
@@ -687,19 +687,19 @@ static bool parseFrontendArgs(FrontendOptions &opts, llvm::opt::ArgList &args,
 }
 
 // Generate the path to look for intrinsic modules
-static std::string getIntrinsicDir() {
+static std::string getIntrinsicDir(const char *argv) {
   // TODO: Find a system independent API
   llvm::SmallString<128> driverPath;
-  driverPath.assign(llvm::sys::fs::getMainExecutable(nullptr, nullptr));
+  driverPath.assign(llvm::sys::fs::getMainExecutable(argv, nullptr));
   llvm::sys::path::remove_filename(driverPath);
   driverPath.append("/../include/flang/");
   return std::string(driverPath);
 }
 
 // Generate the path to look for OpenMP headers
-static std::string getOpenMPHeadersDir() {
+static std::string getOpenMPHeadersDir(const char *argv) {
   llvm::SmallString<128> includePath;
-  includePath.assign(llvm::sys::fs::getMainExecutable(nullptr, nullptr));
+  includePath.assign(llvm::sys::fs::getMainExecutable(argv, nullptr));
   llvm::sys::path::remove_filename(includePath);
   includePath.append("/../include/flang/OpenMP/");
   return std::string(includePath);
@@ -1203,6 +1203,8 @@ bool CompilerInvocation::createFromArgs(
     }
   }
 
+  res.setArgv0(argv0);
+
   return success;
 }
 
@@ -1245,7 +1247,8 @@ void CompilerInvocation::setDefaultFortranOpts() {
 
   // Add the location of omp_lib.h to the search directories. Currently this is
   // identical to the modules' directory.
-  fortranOptions.searchDirectories.emplace_back(getOpenMPHeadersDir());
+  fortranOptions.searchDirectories.emplace_back(
+      getOpenMPHeadersDir(getArgv0()));
 
   fortranOptions.isFixedForm = false;
 }
@@ -1310,7 +1313,8 @@ void CompilerInvocation::setFortranOpts() {
       preprocessorOptions.searchDirectoriesFromIntrModPath.end());
 
   //  Add the default intrinsic module directory
-  fortranOptions.intrinsicModuleDirectories.emplace_back(getIntrinsicDir());
+  fortranOptions.intrinsicModuleDirectories.emplace_back(
+      getIntrinsicDir(getArgv0()));
 
   // Add the directory supplied through -J/-module-dir to the list of search
   // directories