(#4248) fix in CPR with WinSSL

recipes/cpr/all/conanfile.py

@@ -71,15 +71,6 @@ def configure(self):
             # self.options["libcurl"].with_winssl = True # deprecated in https://github.com/conan-io/conan-center-index/pull/2880
             self.options["libcurl"].with_ssl = "schannel"
 
-        if self.options.get_safe("with_winssl", False) and self.settings.os != "Windows":
-            raise ConanInvalidConfiguration("cpr only supports winssl on Windows")
-
-        if self.options.get_safe("with_openssl", False) and self.options.get_safe("with_winssl", False):
-            raise ConanInvalidConfiguration("cpr can not be built with both openssl and winssl")
-
-        if self.settings.compiler == "Visual Studio" and self.options.shared and "MT" in self.settings.compiler.runtime:
-            raise ConanInvalidConfiguration("Visual Studio build for shared library with MT runtime is not supported")
-
     def source(self):
         tools.get(**self.conan_data["sources"][self.version])
         os.rename("cpr-{}".format(self.version), self._source_subfolder)
@@ -107,12 +98,19 @@ def _configure_cmake(self):
             self._cmake.configure(build_folder=self._build_subfolder)
         return self._cmake
 
-    def build(self):
+    def validate(self):
+        if self.options.get_safe("with_winssl", False) and self.settings.os != "Windows":
+            raise ConanInvalidConfiguration("cpr only supports winssl on Windows")
+        if self.options.get_safe("with_openssl", False) and self.options.get_safe("with_winssl", False):
+            raise ConanInvalidConfiguration("cpr can not be built with both openssl and winssl")
+        if self.settings.compiler == "Visual Studio" and self.options.shared and "MT" in self.settings.compiler.runtime:
+            raise ConanInvalidConfiguration("Visual Studio build for shared library with MT runtime is not supported")
         if self.options.get_safe("with_openssl", False) and self.options["libcurl"].with_ssl != "openssl":
             raise ConanInvalidConfiguration("cpr requires libcurl to be built with the option with_ssl='openssl'.")
-        if self.options.get_safe("with_winssl", False) and self.options["libcurl"].with_ssl != "openssl":
+        if self.options.get_safe("with_winssl", False) and self.options["libcurl"].with_ssl != "schannel":
             raise ConanInvalidConfiguration("cpr requires libcurl to be built with the option with_ssl='schannel'.")
 
+    def build(self):
         self._patch_sources()
         cmake = self._configure_cmake()
         cmake.build()