[boost] get rid of compiler version in user config

recipes/boost/all/conanfile.py

@@ -358,8 +358,7 @@ def _build_bcp(self):
         folder = os.path.join(self.source_folder, self._folder_name, 'tools', 'bcp')
         with tools.vcvars(self.settings) if self._is_msvc else tools.no_op():
             with tools.chdir(folder):
-                toolset, _, _ = self._toolset_version_and_exe
-                command = "%s -j%s --abbreviate-paths -d2 toolset=%s" % (self._b2_exe, tools.cpu_count(), toolset)
+                command = "%s -j%s --abbreviate-paths -d2 toolset=%s" % (self._b2_exe, tools.cpu_count(), self._toolset)
                 self.output.warn(command)
                 self.run(command)
 
@@ -567,8 +566,7 @@ def add_defines(option, library):
             if getattr(self.options, "without_%s" % libname):
                 flags.append("--without-%s" % libname)
 
-        toolset, _, _ = self._toolset_version_and_exe
-        flags.append("toolset=%s" % toolset)
+        flags.append("toolset=%s" % self._toolset)
 
         if self.settings.get_safe("compiler.cppstd"):
             flags.append("cxxflags=%s" % cppstd_flag(
@@ -686,14 +684,18 @@ def _cxx(self):
             return os.environ["CXX"]
         if tools.is_apple_os(self.settings.os) and self.settings.compiler == "apple-clang":
             return tools.XCRun(self.settings).cxx
-        return None
+        compiler_version = str(self.settings.compiler.version)
+        major = compiler_version.split(".")[0]
+        if self.settings.compiler == "gcc":
+            return tools.which("g++-%s" % compiler_version) or tools.which("g++-%s" % major) or tools.which("g++") or ""
+        if self.settings.compiler == "clang":
+            return tools.which("clang++-%s" % compiler_version) or tools.which("clang++-%s" % major) or tools.which("clang++") or ""
+        return ""
 
     def _create_user_config_jam(self, folder):
         """To help locating the zlib and bzip2 deps"""
         self.output.warn("Patching user-config.jam")
 
-        compiler_command = self._cxx
-
         contents = ""
         if self._zip_bzip2_requires_needed:
             def create_library_config(name):
@@ -728,12 +730,9 @@ def create_library_config(name):
                         includes=self._python_includes,
                         libraries=self._python_libraries)
 
-        toolset, version, exe = self._toolset_version_and_exe
-        exe = compiler_command or exe  # Prioritize CXX
-
-        # Specify here the toolset with the binary if present if don't empty parameter : :
-        contents += '\nusing "%s" : "%s" : ' % (toolset, version)
-        contents += ' %s' % exe.replace("\\", "/")
+        # Specify here the toolset with the binary if present if don't empty parameter :
+        contents += '\nusing "%s" : %s : ' % (self._toolset, self._toolset_version)
+        contents += ' %s' % self._cxx.replace("\\", "/")
 
         if tools.is_apple_os(self.settings.os):
             if self.settings.compiler == "apple-clang":
@@ -762,52 +761,43 @@ def create_library_config(name):
         tools.save(filename,  contents)
 
     @property
-    def _toolset_version_and_exe(self):
-        compiler_version = str(self.settings.compiler.version)
-        major = compiler_version.split(".")[0]
-        if "." not in compiler_version:
-            compiler_version += ".0"
-        compiler = str(self.settings.compiler)
+    def _toolset_version(self):
         if self._is_msvc:
+            compiler_version = str(self.settings.compiler.version)
             if Version(compiler_version) >= "16":
-                _msvc_version = "14.2"
+                return "14.2"
             elif Version(compiler_version) >= "15":
-                _msvc_version = "14.1"
-            else:
-                _msvc_version = compiler_version
-            return "msvc", _msvc_version, ""
-        elif self.settings.os == "Windows" and self.settings.compiler == "clang":
-            return "clang-win", compiler_version, ""
-        elif self.settings.os == "Emscripten" and self.settings.compiler == "clang":
-            return "emscripten", compiler_version, self._cxx
-        elif self.settings.compiler == "gcc" and tools.is_apple_os(self.settings.os):
-            return "darwin", compiler_version, self._cxx
-        elif compiler == "gcc" and Version(major) >= "5":
-            # For GCC >= v5 we only need the major otherwise Boost doesn't find the compiler
-            # The NOT windows check is necessary to exclude MinGW:
-            if not tools.which("g++-%s" % major):
-                # In fedora 24, 25 the gcc is 6, but there is no g++-6 and the detection is 6.3.1
-                # so b2 fails because 6 != 6.3.1. Specify the exe to avoid the smart detection
-                executable = tools.which("g++") or ""
+                return "14.1"
             else:
-                executable = ""
-            return compiler, compiler_version, executable
-        elif self.settings.compiler == "apple-clang":
-            return "clang-darwin", compiler_version, self._cxx
-        elif self.settings.os == "Android" and self.settings.compiler == "clang":
-            return "clang-linux", compiler_version, self._cxx
+                return "%s.0" % compiler_version
+        return ""
+
+    @property
+    def _toolset(self):
+        compiler = str(self.settings.compiler)
+        if self._is_msvc:
+            return "msvc"
+        elif self.settings.os == "Windows" and compiler == "clang":
+            return "clang-win"
+        elif self.settings.os == "Emscripten" and compiler == "clang":
+            return "emscripten"
+        elif compiler == "gcc" and tools.is_apple_os(self.settings.os):
+            return "darwin"
+        elif compiler == "apple-clang":
+            return "clang-darwin"
+        elif self.settings.os == "Android" and compiler == "clang":
+            return "clang-linux"
         elif str(self.settings.compiler) in ["clang", "gcc"]:
-            # For GCC < v5 and Clang we need to provide the entire version string
-            return compiler, compiler_version, ""
-        elif self.settings.compiler == "sun-cc":
-            return "sunpro", compiler_version, ""
-        elif self.settings.compiler == "intel":
+            return compiler
+        elif compiler == "sun-cc":
+            return "sunpro"
+        elif compiler == "intel":
             toolset = {"Macos": "intel-darwin",
                        "Windows": "intel-win",
                        "Linux": "intel-linux"}.get(str(self.settings.os))
-            return toolset, compiler_version, ""
+            return toolset
         else:
-            return compiler, compiler_version, ""
+            return compiler
 
     ##################### BOOSTRAP METHODS ###########################
     @property

recipes/boost/all/test_package/CMakeLists.txt

@@ -1,5 +1,5 @@
-PROJECT(MyHello)
 cmake_minimum_required(VERSION 2.8)
+project(test_package)
 enable_testing()
 
 set(Boost_DEBUG 1)