[new] Compatible packages regarding C++ standard

features/compatible_packages/app/CMakeLists.txt

@@ -0,0 +1,8 @@
+cmake_minimum_required(VERSION 3.15)
+project(app)
+
+include(${CMAKE_CURRENT_BINARY_DIR}/conanbuildinfo.cmake)
+conan_basic_setup()
+
+add_executable(app src/main.cpp)
+target_link_libraries(app ${CONAN_LIBS})

features/compatible_packages/app/conanfile.py

@@ -0,0 +1,33 @@
+from conans import ConanFile, tools, CMake
+from conans.errors import ConanInvalidConfiguration
+
+
+class Recipe(ConanFile):
+    name = "app"
+    version = "1.0"
+
+    settings = "os", "compiler", "build_type", "arch"
+    license = "MIT"
+    author = "Conan Team"
+    description = "App, requires nothing special"
+
+    generators = "cmake", "cmake_find_package"
+    exports_sources = "CMakeLists.txt", "src/main.cpp"
+
+    options = {'use_hidden': [True, False]}
+    default_options = {'use_hidden': False}
+
+    def requirements(self):
+        if self.options.use_hidden:
+            self.requires("hidden/1.0")
+        else:
+            self.requires("library/1.0")
+
+    def build(self):
+        cmake = CMake(self)
+        cmake.configure()
+        cmake.build()
+
+    def package(self):
+        self.copy("app*", dst="bin", src="bin", keep_path=False)
+        self.copy("LICENSE", dst="licenses", src=".", keep_path=False)

features/compatible_packages/app/src/main.cpp

@@ -0,0 +1,7 @@
+
+#include <iostream>
+#include <mylib.h>
+
+int main() {
+    std::cout << "compute(10, 2) = " << compute(10, 2) << std::endl;
+}

features/compatible_packages/build.sh

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+set -x
+set -e
+
+conan export library/conanfile.py library/1.0@
+conan export app/conanfile.py app/1.0@
+
+conan install app/1.0@ --build=missing

features/compatible_packages/hidden/CMakeLists.txt

@@ -0,0 +1,10 @@
+cmake_minimum_required(VERSION 3.15)
+project(mylib)
+
+include(${CMAKE_CURRENT_BINARY_DIR}/conanbuildinfo.cmake)
+conan_basic_setup()
+
+set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS ON)
+add_library(mylib src/mylib.cpp)

features/compatible_packages/hidden/conanfile.py

@@ -0,0 +1,44 @@
+from conans import ConanFile, tools, CMake
+from conans.errors import ConanInvalidConfiguration
+
+
+class Recipe(ConanFile):
+    name = "hidden"
+    version = "1.0"
+
+    settings = "os", "compiler", "build_type", "arch"
+    license = "MIT"
+    author = "Conan Team"
+    description = "Library requires C++14 to build, but API is C++11 compatible"
+
+    generators = "cmake"
+    exports_sources = "CMakeLists.txt", "src/mylib.cpp", "include/mylib.h"
+
+    def configure(self):
+        if self.settings.compiler.get_safe('cppstd'):
+            tools.check_min_cppstd(self, "11")
+
+    def validate(self):
+        if self.settings.compiler.get_safe('cppstd'):
+            tools.check_min_cppstd(self, "14")
+
+    def build(self):
+        cmake = CMake(self)
+        cmake.configure()
+        cmake.build()
+
+    def package(self):
+        self.copy("*.h", dst="include", src="include", keep_path=False)
+        self.copy("*.lib", dst="lib", src="lib", keep_path=False)
+        self.copy("*.a", dst="lib", src="lib", keep_path=False)
+        self.copy("LICENSE", dst="licenses", src=".", keep_path=False)
+
+    def package_info(self):
+        self.cpp_info.libs = ["mylib"]
+
+    def package_id(self):
+        for cppstd in ("11", "14", "17", "20"):
+            for gnu in ("", "gnu"):
+                compatible_pkg = self.info.clone()
+                compatible_pkg.settings.compiler.cppstd = "{}{}".format(gnu, cppstd)
+                self.compatible_packages.append(compatible_pkg)

features/compatible_packages/hidden/include/mylib.h

@@ -0,0 +1,2 @@
+
+auto compute(int a, float b) -> float;

features/compatible_packages/hidden/src/mylib.cpp

@@ -0,0 +1,8 @@
+
+#include <utility>
+#include "../include/mylib.h"
+
+auto compute(int a, float b) -> float {
+    auto p = std::make_pair(a, b);
+    return std::get<int>(p)/std::get<float>(p);
+}

features/compatible_packages/library/CMakeLists.txt

@@ -0,0 +1,8 @@
+cmake_minimum_required(VERSION 3.15)
+project(mylib)
+
+include(${CMAKE_CURRENT_BINARY_DIR}/conanbuildinfo.cmake)
+conan_basic_setup()
+
+set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS ON)
+add_library(mylib src/mylib.cpp)

features/compatible_packages/library/conanfile.py

@@ -0,0 +1,42 @@
+from conans import ConanFile, tools, CMake
+from conans.errors import ConanInvalidConfiguration
+
+
+class Recipe(ConanFile):
+    name = "library"
+    version = "1.0"
+
+    settings = "os", "compiler", "build_type", "arch"
+    license = "MIT"
+    author = "Conan Team"
+    description = "Library requires C++14 to build, but API is C++11 compatible"
+
+    generators = "cmake"
+    exports_sources = "CMakeLists.txt", "src/mylib.cpp", "include/mylib.h"
+
+    def configure(self):
+        tools.check_min_cppstd(self, "11")
+
+    def validate(self):
+        tools.check_min_cppstd(self, "14")
+
+    def build(self):
+        cmake = CMake(self)
+        cmake.configure()
+        cmake.build()
+
+    def package(self):
+        self.copy("*.h", dst="include", src="include", keep_path=False)
+        self.copy("*.lib", dst="lib", src="lib", keep_path=False)
+        self.copy("*.a", dst="lib", src="lib", keep_path=False)
+        self.copy("LICENSE", dst="licenses", src=".", keep_path=False)
+
+    def package_info(self):
+        self.cpp_info.libs = ["mylib"]
+
+    def package_id(self):
+        for cppstd in ("11", "14", "17", "20"):
+            for gnu in ("", "gnu"):
+                compatible_pkg = self.info.clone()
+                compatible_pkg.settings.compiler.cppstd = "{}{}".format(gnu, cppstd)
+                self.compatible_packages.append(compatible_pkg)

features/compatible_packages/library/include/mylib.h

@@ -0,0 +1,2 @@
+
+auto compute(int a, float b) -> float;

features/compatible_packages/library/src/mylib.cpp

@@ -0,0 +1,8 @@
+
+#include <utility>
+#include "../include/mylib.h"
+
+auto compute(int a, float b) -> float {
+    auto p = std::make_pair(a, b);
+    return std::get<int>(p)/std::get<float>(p);
+}