From 7276880fdfb3b800efc3defe434771d94fbb4ecb Mon Sep 17 00:00:00 2001
From: Balazs Benics <benicsbalazs@gmail.com>
Date: Sun, 28 Jul 2019 14:43:07 +0200
Subject: [PATCH] fix non stdc++17 buildbots

---
 .travis.yml  | 23 -----------------------
 appveyor.yml | 18 +++++++++---------
 conanfile.py | 34 +++++++++++++++++++++++++++++-----
 3 files changed, 38 insertions(+), 37 deletions(-)

diff --git a/.travis.yml b/.travis.yml
index 4941ec8..f0b6512 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -24,15 +24,6 @@ osx: &osx
 
 matrix:
    include:
-    #  - <<: *linux
-    #    env: CONAN_GCC_VERSIONS=4.9 CONAN_DOCKER_IMAGE=conanio/gcc49
-
-    #  - <<: *linux
-    #    env: CONAN_GCC_VERSIONS=5 CONAN_DOCKER_IMAGE=conanio/gcc5
-
-    #  - <<: *linux
-    #    env: CONAN_GCC_VERSIONS=6 CONAN_DOCKER_IMAGE=conanio/gcc6
-
       - <<: *linux
         env: CONAN_GCC_VERSIONS=7 CONAN_DOCKER_IMAGE=conanio/gcc7
 
@@ -42,12 +33,6 @@ matrix:
       - <<: *linux
         env: CONAN_GCC_VERSIONS=9 CONAN_DOCKER_IMAGE=conanio/gcc9
 
-    #  - <<: *linux
-    #    env: CONAN_CLANG_VERSIONS=3.9 CONAN_DOCKER_IMAGE=conanio/clang39
-
-      - <<: *linux
-        env: CONAN_CLANG_VERSIONS=4.0 CONAN_DOCKER_IMAGE=conanio/clang40
-
       - <<: *linux
         env: CONAN_CLANG_VERSIONS=5.0 CONAN_DOCKER_IMAGE=conanio/clang50
 
@@ -60,14 +45,6 @@ matrix:
       - <<: *linux
         env: CONAN_CLANG_VERSIONS=8 CONAN_DOCKER_IMAGE=conanio/clang8
 
-      - <<: *osx
-        osx_image: xcode7.3
-        env: CONAN_APPLE_CLANG_VERSIONS=7.3
-
-      - <<: *osx
-        osx_image: xcode8.3
-        env: CONAN_APPLE_CLANG_VERSIONS=8.1
-
       - <<: *osx
         osx_image: xcode9.2
         env: CONAN_APPLE_CLANG_VERSIONS=9.0
diff --git a/appveyor.yml b/appveyor.yml
index 85b4596..1144398 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -4,18 +4,18 @@ environment:
     PYTHON: "C:\\Python37"
 
     matrix:
-        - MINGW_CONFIGURATIONS: '4.9@x86_64@seh@posix, 5@x86_64@seh@posix, 6@x86_64@seh@posix, 7@x86_64@seh@posix'
-        - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
-          CONAN_VISUAL_VERSIONS: 14
+        - MINGW_CONFIGURATIONS: '7@x86_64@seh@posix, 7@x86@seh@posix, 8@x86_64@seh@posix, 8@x86@seh@posix'
+        - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
+          CONAN_VISUAL_VERSIONS: 15
           CONAN_BUILD_TYPES: Release
-        - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
-          CONAN_VISUAL_VERSIONS: 14
+        - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
+          CONAN_VISUAL_VERSIONS: 15
           CONAN_BUILD_TYPES: Debug
-        - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
-          CONAN_VISUAL_VERSIONS: 15
+        - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
+          CONAN_VISUAL_VERSIONS: 16
           CONAN_BUILD_TYPES: Release
-        - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
-          CONAN_VISUAL_VERSIONS: 15
+        - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
+          CONAN_VISUAL_VERSIONS: 16
           CONAN_BUILD_TYPES: Debug
 
 
diff --git a/conanfile.py b/conanfile.py
index 17aab81..b86f289 100644
--- a/conanfile.py
+++ b/conanfile.py
@@ -1,9 +1,9 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
 
-from conans import ConanFile, tools, CMake
-import os
-
+from conans import ConanFile, CMake
+from conans.model.version import Version
+from conans.errors import ConanException
 
 class NameofConan(ConanFile):
     name = 'nameof'
@@ -32,15 +32,39 @@ class NameofConan(ConanFile):
         'build_examples': False,
     }
 
+    @property
+    def supports_string_view(self):
+        compiler = str(self.settings.compiler)
+        version = Version(str(self.settings.compiler.version))
+        if compiler == 'Visual Studio' and version >= Version('15'):
+            return True
+        if compiler == 'gcc' and version >= Version('7'):
+            return True
+        if compiler == 'icc' and version >= Version('19'):
+            return True
+        if compiler == 'clang' and version >= Version('5'):
+            return True
+        if compiler == 'apple-clang' and version >= Version('9'):
+            return True
+        return False
+
     def requirements(self):
         if self.options.build_tests:
             self.requires('Catch2/2.9.1@catchorg/stable')
 
+    def configure(self):
+        if not self.supports_string_view:
+            raise ConanException('The specified compiler must support C++17')
+
     def config_options(self):
         needs_build = self.options.build_tests or self.options.build_examples
+
+        # remove all build settings since it is a header-only library
         if not needs_build:
-            # remove all build settings since it is a header-only library
-            self.options.remove(['os', 'compiler', 'build_type', 'arch'])
+            del self.options.os
+            del self.options.compiler
+            del self.options.build_type
+            del self.options.arch
 
     def configure_cmake(self):
         cmake = CMake(self)