nmake/jom: Only warn about bad VS environment if compiler not found.

nmake and jom generators no longer warn about missing INCLUDE/LIB
environment variables unless the C/CXX compiler cannot be found.  This
is useful if the user does not want to use these generators with the
Visual C++ compiler, or they do not want to enable any language.

Source/cmGlobalGenerator.h

@@ -374,6 +374,8 @@ protected:
   void SetLanguageEnabledFlag(const std::string& l, cmMakefile* mf);
   void SetLanguageEnabledMaps(const std::string& l, cmMakefile* mf);
   void FillExtensionToLanguageMap(const std::string& l, cmMakefile* mf);
+  virtual void PrintCompilerAdvice(std::ostream& os, std::string const& lang,
+                                   const char* envVar) const;
 
   virtual bool ComputeTargetDepends();
 
@@ -462,8 +464,6 @@ private:
 
   virtual void ForceLinkerLanguages();
 
-  virtual void PrintCompilerAdvice(std::ostream& os, std::string const& lang,
-                                   const char* envVar) const;
   void CheckCompilerIdCompatibility(cmMakefile* mf,
                                     std::string const& lang) const;
 

Source/cmGlobalJOMMakefileGenerator.cxx

@@ -36,18 +36,6 @@ void cmGlobalJOMMakefileGenerator
   // pick a default
   mf->AddDefinition("CMAKE_GENERATOR_CC", "cl");
   mf->AddDefinition("CMAKE_GENERATOR_CXX", "cl");
-  if(!(cmSystemTools::GetEnv("INCLUDE") &&
-       cmSystemTools::GetEnv("LIB"))
-    )
-    {
-    std::string message = "To use the JOM generator, cmake must be run "
-      "from a shell that can use the compiler cl from the command line. "
-      "This environment does not contain INCLUDE, LIB, or LIBPATH, and "
-      "these must be set for the cl compiler to work. ";
-    mf->IssueMessage(cmake::WARNING,
-                     message);
-    }
-
   this->cmGlobalUnixMakefileGenerator3::EnableLanguage(l, mf, optional);
 }
 
@@ -58,3 +46,19 @@ void cmGlobalJOMMakefileGenerator
   entry.Name = cmGlobalJOMMakefileGenerator::GetActualName();
   entry.Brief = "Generates JOM makefiles.";
 }
+
+//----------------------------------------------------------------------------
+void cmGlobalJOMMakefileGenerator::PrintCompilerAdvice(std::ostream& os,
+                                                  std::string const& lang,
+                                                  const char* envVar) const
+{
+  if(lang == "CXX" || lang == "C")
+    {
+    os <<
+      "To use the JOM generator with Visual C++, cmake must be run from a "
+      "shell that can use the compiler cl from the command line. This "
+      "environment is unable to invoke the cl compiler. To fix this problem, "
+      "run cmake from the Visual Studio Command Prompt (vcvarsall.bat).\n";
+    }
+  this->cmGlobalUnixMakefileGenerator3::PrintCompilerAdvice(os, lang, envVar);
+}

Source/cmGlobalJOMMakefileGenerator.h

@@ -42,6 +42,9 @@ public:
    */
   virtual void EnableLanguage(std::vector<std::string>const& languages,
                               cmMakefile *, bool optional);
+private:
+  void PrintCompilerAdvice(std::ostream& os, std::string const& lang,
+                           const char* envVar) const;
 };
 
 #endif

Source/cmGlobalNMakeMakefileGenerator.cxx

@@ -36,18 +36,6 @@ void cmGlobalNMakeMakefileGenerator
   // pick a default
   mf->AddDefinition("CMAKE_GENERATOR_CC", "cl");
   mf->AddDefinition("CMAKE_GENERATOR_CXX", "cl");
-  if(!(cmSystemTools::GetEnv("INCLUDE") &&
-       cmSystemTools::GetEnv("LIB"))
-    )
-    {
-    std::string message = "To use the NMake generator, cmake must be run "
-      "from a shell that can use the compiler cl from the command line. "
-      "This environment does not contain INCLUDE, LIB, or LIBPATH, and "
-      "these must be set for the cl compiler to work. ";
-    mf->IssueMessage(cmake::WARNING,
-                     message);
-    }
-
   this->cmGlobalUnixMakefileGenerator3::EnableLanguage(l, mf, optional);
 }
 
@@ -58,3 +46,19 @@ void cmGlobalNMakeMakefileGenerator
   entry.Name = cmGlobalNMakeMakefileGenerator::GetActualName();
   entry.Brief = "Generates NMake makefiles.";
 }
+
+//----------------------------------------------------------------------------
+void cmGlobalNMakeMakefileGenerator::PrintCompilerAdvice(std::ostream& os,
+                                                  std::string const& lang,
+                                                  const char* envVar) const
+{
+  if(lang == "CXX" || lang == "C")
+    {
+    os <<
+      "To use the NMake generator with Visual C++, cmake must be run from a "
+      "shell that can use the compiler cl from the command line. This "
+      "environment is unable to invoke the cl compiler. To fix this problem, "
+      "run cmake from the Visual Studio Command Prompt (vcvarsall.bat).\n";
+    }
+  this->cmGlobalUnixMakefileGenerator3::PrintCompilerAdvice(os, lang, envVar);
+}

Source/cmGlobalNMakeMakefileGenerator.h

@@ -40,6 +40,9 @@ public:
    */
   virtual void EnableLanguage(std::vector<std::string>const& languages,
                               cmMakefile *, bool optional);
+private:
+  void PrintCompilerAdvice(std::ostream& os, std::string const& lang,
+                           const char* envVar) const;
 };
 
 #endif

Tests/RunCMake/CompilerNotFound/BadCompilerC-stderr-JOM.txt

@@ -0,0 +1,17 @@
+CMake Error at BadCompilerC.cmake:2 \(enable_language\):
+  The CMAKE_C_COMPILER:
+
+    no-C-compiler
+
+  is not a full path and was not found in the PATH.
+
+  To use the JOM generator with Visual C\+\+, cmake must be run from a shell
+  that can use the compiler cl from the command line.  This environment is
+  unable to invoke the cl compiler.  To fix this problem, run cmake from the
+  Visual Studio Command Prompt \(vcvarsall.bat\).
+
+  Tell CMake where to find the compiler by setting either the environment
+  variable "CC" or the CMake cache entry CMAKE_C_COMPILER to the full path to
+  the compiler, or to the compiler name if it is in the PATH.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)$

Tests/RunCMake/CompilerNotFound/BadCompilerC-stderr-NMake.txt

@@ -0,0 +1,17 @@
+CMake Error at BadCompilerC.cmake:2 \(enable_language\):
+  The CMAKE_C_COMPILER:
+
+    no-C-compiler
+
+  is not a full path and was not found in the PATH.
+
+  To use the NMake generator with Visual C\+\+, cmake must be run from a shell
+  that can use the compiler cl from the command line.  This environment is
+  unable to invoke the cl compiler.  To fix this problem, run cmake from the
+  Visual Studio Command Prompt \(vcvarsall.bat\).
+
+  Tell CMake where to find the compiler by setting either the environment
+  variable "CC" or the CMake cache entry CMAKE_C_COMPILER to the full path to
+  the compiler, or to the compiler name if it is in the PATH.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)$

Tests/RunCMake/CompilerNotFound/BadCompilerCXX-stderr-JOM.txt

@@ -0,0 +1,17 @@
+CMake Error at BadCompilerCXX.cmake:2 \(enable_language\):
+  The CMAKE_CXX_COMPILER:
+
+    no-CXX-compiler
+
+  is not a full path and was not found in the PATH.
+
+  To use the JOM generator with Visual C\+\+, cmake must be run from a shell
+  that can use the compiler cl from the command line.  This environment is
+  unable to invoke the cl compiler.  To fix this problem, run cmake from the
+  Visual Studio Command Prompt \(vcvarsall.bat\).
+
+  Tell CMake where to find the compiler by setting either the environment
+  variable "CXX" or the CMake cache entry CMAKE_CXX_COMPILER to the full path
+  to the compiler, or to the compiler name if it is in the PATH.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)$

Tests/RunCMake/CompilerNotFound/BadCompilerCXX-stderr-NMake.txt

@@ -0,0 +1,17 @@
+CMake Error at BadCompilerCXX.cmake:2 \(enable_language\):
+  The CMAKE_CXX_COMPILER:
+
+    no-CXX-compiler
+
+  is not a full path and was not found in the PATH.
+
+  To use the NMake generator with Visual C\+\+, cmake must be run from a shell
+  that can use the compiler cl from the command line.  This environment is
+  unable to invoke the cl compiler.  To fix this problem, run cmake from the
+  Visual Studio Command Prompt \(vcvarsall.bat\).
+
+  Tell CMake where to find the compiler by setting either the environment
+  variable "CXX" or the CMake cache entry CMAKE_CXX_COMPILER to the full path
+  to the compiler, or to the compiler name if it is in the PATH.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)$

Tests/RunCMake/CompilerNotFound/BadCompilerCandCXX-stderr-JOM.txt

@@ -0,0 +1,35 @@
+CMake Error at BadCompilerCandCXX.cmake:3 \(project\):
+  The CMAKE_C_COMPILER:
+
+    no-C-compiler
+
+  is not a full path and was not found in the PATH.
+
+  To use the JOM generator with Visual C\+\+, cmake must be run from a shell
+  that can use the compiler cl from the command line.  This environment is
+  unable to invoke the cl compiler.  To fix this problem, run cmake from the
+  Visual Studio Command Prompt \(vcvarsall.bat\).
+
+  Tell CMake where to find the compiler by setting either the environment
+  variable "CC" or the CMake cache entry CMAKE_C_COMPILER to the full path to
+  the compiler, or to the compiler name if it is in the PATH.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)
++
+CMake Error at BadCompilerCandCXX.cmake:3 \(project\):
+  The CMAKE_CXX_COMPILER:
+
+    no-CXX-compiler
+
+  is not a full path and was not found in the PATH.
+
+  To use the JOM generator with Visual C\+\+, cmake must be run from a shell
+  that can use the compiler cl from the command line.  This environment is
+  unable to invoke the cl compiler.  To fix this problem, run cmake from the
+  Visual Studio Command Prompt \(vcvarsall.bat\).
+
+  Tell CMake where to find the compiler by setting either the environment
+  variable "CXX" or the CMake cache entry CMAKE_CXX_COMPILER to the full path
+  to the compiler, or to the compiler name if it is in the PATH.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)$

Tests/RunCMake/CompilerNotFound/BadCompilerCandCXX-stderr-NMake.txt

@@ -0,0 +1,35 @@
+CMake Error at BadCompilerCandCXX.cmake:3 \(project\):
+  The CMAKE_C_COMPILER:
+
+    no-C-compiler
+
+  is not a full path and was not found in the PATH.
+
+  To use the NMake generator with Visual C\+\+, cmake must be run from a shell
+  that can use the compiler cl from the command line.  This environment is
+  unable to invoke the cl compiler.  To fix this problem, run cmake from the
+  Visual Studio Command Prompt \(vcvarsall.bat\).
+
+  Tell CMake where to find the compiler by setting either the environment
+  variable "CC" or the CMake cache entry CMAKE_C_COMPILER to the full path to
+  the compiler, or to the compiler name if it is in the PATH.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)
++
+CMake Error at BadCompilerCandCXX.cmake:3 \(project\):
+  The CMAKE_CXX_COMPILER:
+
+    no-CXX-compiler
+
+  is not a full path and was not found in the PATH.
+
+  To use the NMake generator with Visual C\+\+, cmake must be run from a shell
+  that can use the compiler cl from the command line.  This environment is
+  unable to invoke the cl compiler.  To fix this problem, run cmake from the
+  Visual Studio Command Prompt \(vcvarsall.bat\).
+
+  Tell CMake where to find the compiler by setting either the environment
+  variable "CXX" or the CMake cache entry CMAKE_CXX_COMPILER to the full path
+  to the compiler, or to the compiler name if it is in the PATH.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)$

Tests/RunCMake/CompilerNotFound/RunCMakeTest.cmake

@@ -4,6 +4,20 @@ if("${RunCMake_GENERATOR}" MATCHES "Visual Studio|Xcode")
   run_cmake(NoCompilerC-IDE)
   run_cmake(NoCompilerCXX-IDE)
   run_cmake(NoCompilerCandCXX-IDE)
+elseif(RunCMake_GENERATOR STREQUAL "NMake Makefiles")
+  set(RunCMake-stderr-file BadCompilerC-stderr-NMake.txt)
+  run_cmake(BadCompilerC)
+  set(RunCMake-stderr-file BadCompilerCXX-stderr-NMake.txt)
+  run_cmake(BadCompilerCXX)
+  set(RunCMake-stderr-file BadCompilerCandCXX-stderr-NMake.txt)
+  run_cmake(BadCompilerCandCXX)
+elseif(RunCMake_GENERATOR STREQUAL "NMake Makefiles JOM")
+  set(RunCMake-stderr-file BadCompilerC-stderr-JOM.txt)
+  run_cmake(BadCompilerC)
+  set(RunCMake-stderr-file BadCompilerCXX-stderr-JOM.txt)
+  run_cmake(BadCompilerCXX)
+  set(RunCMake-stderr-file BadCompilerCandCXX-stderr-JOM.txt)
+  run_cmake(BadCompilerCandCXX)
 else()
   run_cmake(BadCompilerC)
   run_cmake(BadCompilerCXX)