[pistache] Proper manage libevent dependency (#28376)

* Do not install libevent by default

Signed-off-by: Uilian Ries <uilianries@gmail.com>

* Libevent is only optional for Linux

Signed-off-by: Uilian Ries <uilianr@jfrog.com>

* Convert Conan option value to bool - fix Conan warning

Signed-off-by: Uilian Ries <uilianr@jfrog.com>

---------

Signed-off-by: Uilian Ries <uilianries@gmail.com>
Signed-off-by: Uilian Ries <uilianr@jfrog.com>

Author: uilianries

recipes/pistache/all/conanfile.py

@@ -31,7 +31,7 @@ class PistacheConan(ConanFile):
         "shared": False,
         "fPIC": True,
         "with_ssl": False,
-        "with_libevent": True
+        "with_libevent": False
     }
     implements = ["auto_shared_fpic"]
 
@@ -56,15 +56,16 @@ def requirements(self):
         self.requires("date/3.0.1")
         if self.options.with_ssl:
             self.requires("openssl/[>=1.1 <4]")
-        if self.options.get_safe("with_libevent", True):
+        if self.settings.os != "Linux" or self.options.get_safe("with_libevent"):
+            # INFO: meson.build:188: Linux can use native epoll support. Other OS need libevent always
             self.requires("libevent/2.1.12")
 
     def validate(self):
         if self.settings.os != "Linux" and Version(self.version) < "0.4.25":
             raise ConanInvalidConfiguration(f"{self.ref} is only support on Linux.")
         if self.settings.compiler == "clang" and Version(self.version) < "0.4.25":
             raise ConanInvalidConfiguration(f"{self.ref}'s clang support is broken. See pistacheio/pistache#835.")
-        
+
         if Version(self.version) == "0.4.25" and self.settings.os == "Windows":
             # See https://github.com/conan-io/conan-center-index/pull/26463#issuecomment-2962541819
             raise ConanInvalidConfiguration("Windows builds are broken - contributions welcome")
@@ -83,12 +84,12 @@ def source(self):
 
     def generate(self):
         tc = MesonToolchain(self)
-        tc.project_options["PISTACHE_USE_SSL"] = self.options.with_ssl
+        tc.project_options["PISTACHE_USE_SSL"] = bool(self.options.with_ssl)
         tc.project_options["PISTACHE_BUILD_EXAMPLES"] = False
         tc.project_options["PISTACHE_BUILD_TESTS"] = False
         tc.project_options["PISTACHE_BUILD_DOCS"] = False
-        if self._supports_libevent:
-            tc.project_options["PISTACHE_FORCE_LIBEVENT"] = self.options.get_safe("with_libevent", True)
+        if self.settings.os == "Linux" and self._supports_libevent:
+            tc.project_options["PISTACHE_FORCE_LIBEVENT"] = bool(self.options.with_libevent)
         tc.generate()
         deps = PkgConfigDeps(self)
         deps.generate()
@@ -121,7 +122,7 @@ def package_info(self):
 
         self.cpp_info.components["libpistache"].libs = collect_libs(self)
         self.cpp_info.components["libpistache"].requires = ["rapidjson::rapidjson"]
-        if self.options.get_safe("with_libevent", True):
+        if  self.settings.os != "Linux" or self.options.get_safe("with_libevent"):
             self.cpp_info.components["libpistache"].requires.append("libevent::libevent")
         self.cpp_info.components["libpistache"].requires.append("date::date")
         if self.options.with_ssl: