[flang] Version information in flang/f18

Fixed some version information in flang/f18:

  - fixed the behavior of the -v switch: this flag enables verbosity with used with arguments, but just displays the version when used alone (related to this bug: https://bugs.llvm.org/show_bug.cgi?id=46017)
 - added __FLANG, __FLANG_MAJOR__, __FLANG_MINOR__ and __FLANG_PATCHLEVEL__ (similar to their __F18* counterparts) for compatibility purpose

Reviewed By: sscalpone, AlexisPerry, richard.barton.arm, tskeith

Differential Revision: https://reviews.llvm.org/D84334

flang/test/Driver/version_test.f90

@@ -1,7 +1,10 @@
 ! Check that lit configuration works by checking the compiler version
 
-! RUN: %f18 -V 2>&1 | FileCheck  -check-prefix=VERSION %s
 ! VERSION-NOT:{{![[:space:]]}}
 ! VERSION:{{[[:space:]]}}
-! VERSION-SAME:f18 compiler (under development)
+! VERSION-SAME:f18 compiler (under development), version {{[1-9][0-9]*.[0-9]*.[0-9]*}}
 ! VERSION-EMPTY:
+
+! RUN: %f18 -V 2>&1 | FileCheck  -check-prefix=VERSION %s
+! RUN: %f18 -v 2>&1 | FileCheck  -check-prefix=VERSION %s
+! RUN: %f18 --version 2>&1 | FileCheck  -check-prefix=VERSION %s

flang/test/Preprocessing/compiler_defined_macros.F90

@@ -0,0 +1,12 @@
+! Check that the macros that give the verion number are set properly
+
+!CHECK: flang_major = {{[1-9][0-9]*$}}
+!CHECK: flang_minor = {{[0-9]+$}}
+!CHECK: flang_patchlevel = {{[0-9]+$}}
+!RUN: %f18 -E %s | FileCheck  --ignore-case %s
+
+  
+integer, parameter :: flang_major = __flang_major__
+integer, parameter :: flang_minor = __flang_minor__
+integer, parameter :: flang_patchlevel = __flang_patchlevel__
+

flang/tools/f18/CMakeLists.txt

@@ -80,5 +80,6 @@ endif()
 # The flang script to be installed needs a different path to the headers.
 set(FLANG_INTRINSIC_MODULES_DIR ${CMAKE_INSTALL_PREFIX}/include/flang)
 configure_file(${CMAKE_CURRENT_SOURCE_DIR}/flang.sh.in ${FLANG_BINARY_DIR}/bin/flang-install.sh @ONLY)
+configure_file(${CMAKE_CURRENT_SOURCE_DIR}/f18_version.h.in ${CMAKE_CURRENT_BINARY_DIR}/f18_version.h @ONLY)
 
 install(PROGRAMS ${FLANG_BINARY_DIR}/bin/flang-install.sh DESTINATION bin RENAME flang PERMISSIONS OWNER_EXECUTE OWNER_READ OWNER_WRITE)

flang/tools/f18/f18.cpp

@@ -38,6 +38,8 @@
 #include <unistd.h>
 #include <vector>
 
+#include "f18_version.h"
+
 static std::list<std::string> argList(int argc, char *const argv[]) {
   std::list<std::string> result;
   for (int j = 0; j < argc; ++j) {
@@ -391,6 +393,13 @@ void Link(std::vector<std::string> &liblist, std::vector<std::string> &objects,
   }
 }
 
+int printVersion() {
+  llvm::errs() << "\nf18 compiler (under development), version "
+               << __FLANG_MAJOR__ << "." << __FLANG_MINOR__ << "."
+               << __FLANG_PATCHLEVEL__ << "\n";
+  return exitStatus;
+}
+
 int main(int argc, char *const argv[]) {
 
   atexit(CleanUpAtExit);
@@ -412,6 +421,11 @@ int main(int argc, char *const argv[]) {
   options.predefinitions.emplace_back("__F18_MAJOR__", "1");
   options.predefinitions.emplace_back("__F18_MINOR__", "1");
   options.predefinitions.emplace_back("__F18_PATCHLEVEL__", "1");
+  options.predefinitions.emplace_back("__flang__", __FLANG__);
+  options.predefinitions.emplace_back("__flang_major__", __FLANG_MAJOR__);
+  options.predefinitions.emplace_back("__flang_minor__", __FLANG_MINOR__);
+  options.predefinitions.emplace_back(
+      "__flang_patchlevel__", __FLANG_PATCHLEVEL__);
 #if __x86_64__
   options.predefinitions.emplace_back("__x86_64__", "1");
 #endif
@@ -661,13 +675,16 @@ int main(int argc, char *const argv[]) {
           << "Unrecognised options are passed through to the external compiler\n"
           << "set by F18_FC (see defaults).\n";
       return exitStatus;
-    } else if (arg == "-V") {
-      llvm::errs() << "\nf18 compiler (under development)\n";
-      return exitStatus;
+    } else if (arg == "-V" || arg == "--version") {
+      return printVersion();
     } else {
       driver.F18_FCArgs.push_back(arg);
       if (arg == "-v") {
-        driver.verbose = true;
+        if (args.size() > 1) {
+          driver.verbose = true;
+        } else {
+          return printVersion();
+        }
       } else if (arg == "-I") {
         driver.F18_FCArgs.push_back(args.front());
         driver.searchDirectories.push_back(args.front());

flang/tools/f18/f18_version.h.in

@@ -0,0 +1,9 @@
+#ifndef _F18_H_
+#define _F18_H_
+
+#define __FLANG__ "1"
+#define __FLANG_MAJOR__ "@LLVM_VERSION_MAJOR@"
+#define __FLANG_MINOR__ "@LLVM_VERSION_MINOR@"
+#define __FLANG_PATCHLEVEL__ "@LLVM_VERSION_PATCH@"
+
+#endif // _F18_H_