fix(conan): openvpn support in MSVC+Ninja setup (#2616)

recipes/openvpn/conandata.yml

@@ -0,0 +1,4 @@
+patches:
+  "2.7.0":
+    - patch_file: "patches/0001-carefully-handle-CMAKE_GENERATOR_PLATFORM.patch"
+    - patch_file: "patches/0002-explicitly-pass-unicode-everywhere.patch"

recipes/openvpn/conanfile.py

@@ -1,5 +1,5 @@
 from conan import ConanFile
-from conan.tools.files import get, copy, replace_in_file
+from conan.tools.files import get, copy, replace_in_file, apply_conandata_patches, export_conandata_patches
 from conan.tools.gnu import Autotools, AutotoolsToolchain, AutotoolsDeps, PkgConfigDeps
 from conan.tools.layout import basic_layout
 from conan.tools.cmake import cmake_layout, CMakeToolchain, CMake, CMakeDeps
@@ -17,6 +17,7 @@ class Openvpn(ConanFile):
         return str(self.settings.os).startswith("Windows")
 
     def export_sources(self):
+        export_conandata_patches(self)
         copy(self, "*applink.c", src=self.recipe_folder, dst=self.export_sources_folder)
 
     def layout(self):
@@ -84,6 +85,7 @@ class Openvpn(ConanFile):
             deps.generate()
 
     def build(self):
+        apply_conandata_patches(self)
         if self._is_windows:
             cmake = CMake(self)
             cmake.configure()

recipes/openvpn/patches/0001-carefully-handle-CMAKE_GENERATOR_PLATFORM.patch

@@ -0,0 +1,25 @@
+From 693bee38daaec5962ea3f0939c71e869f202c08a Mon Sep 17 00:00:00 2001
+From: Yaroslav Gurov <ygurov@proton.me>
+Date: Mon, 18 May 2026 16:58:00 +0200
+Subject: [PATCH] carefully handle CMAKE_GENERATOR_PLATFORM
+
+---
+ CMakeLists.txt | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 198c98ff..7341db70 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -108,7 +108,7 @@ if (MSVC)
+         "$<$<CONFIG:Release>:/OPT:REF>"
+         "$<$<CONFIG:Release>:/OPT:ICF>"
+         )
+-    if (${CMAKE_GENERATOR_PLATFORM} STREQUAL "x64" OR ${CMAKE_GENERATOR_PLATFORM} STREQUAL "x86")
++    if ("${CMAKE_GENERATOR_PLATFORM}" STREQUAL "x64" OR "${CMAKE_GENERATOR_PLATFORM}" STREQUAL "x86")
+         add_link_options("$<$<CONFIG:Release>:/CETCOMPAT>")
+     endif()
+ else ()
+-- 
+2.46.0.windows.1
+

recipes/openvpn/patches/0002-explicitly-pass-unicode-everywhere.patch

@@ -0,0 +1,50 @@
+From 9a42a0350abaa1a329ad56e40b1900ef78183323 Mon Sep 17 00:00:00 2001
+From: Yaroslav Gurov <ygurov@proton.me>
+Date: Mon, 18 May 2026 18:05:09 +0200
+Subject: [PATCH] explicitly pass unicode everywhere
+
+---
+ src/openvpnmsica/CMakeLists.txt | 1 +
+ src/openvpnserv/CMakeLists.txt  | 1 +
+ src/tapctl/CMakeLists.txt       | 1 +
+ 3 files changed, 3 insertions(+)
+
+diff --git a/src/openvpnmsica/CMakeLists.txt b/src/openvpnmsica/CMakeLists.txt
+index 9126b80f..23f979d6 100644
+--- a/src/openvpnmsica/CMakeLists.txt
++++ b/src/openvpnmsica/CMakeLists.txt
+@@ -22,6 +22,7 @@ target_sources(openvpnmsica PRIVATE
+     openvpnmsica_resources.rc
+     )
+ target_compile_options(openvpnmsica PRIVATE
++    -DUNICODE
+     -D_UNICODE
+     -UNTDDI_VERSION
+     -D_WIN32_WINNT=_WIN32_WINNT_VISTA
+diff --git a/src/openvpnserv/CMakeLists.txt b/src/openvpnserv/CMakeLists.txt
+index fc153822..b3a0cff1 100644
+--- a/src/openvpnserv/CMakeLists.txt
++++ b/src/openvpnserv/CMakeLists.txt
+@@ -19,6 +19,7 @@ function(add_common_options target)
+         ${MC_GEN_DIR}
+     )
+     target_compile_options(${target} PRIVATE
++        -DUNICODE
+         -D_UNICODE
+         -UNTDDI_VERSION
+         -D_WIN32_WINNT=_WIN32_WINNT_VISTA
+diff --git a/src/tapctl/CMakeLists.txt b/src/tapctl/CMakeLists.txt
+index 97702c01..81da46b8 100644
+--- a/src/tapctl/CMakeLists.txt
++++ b/src/tapctl/CMakeLists.txt
+@@ -19,6 +19,7 @@ target_sources(tapctl PRIVATE
+     tapctl_resources.rc
+     )
+ target_compile_options(tapctl PRIVATE
++    -DUNICODE
+     -D_UNICODE
+     -UNTDDI_VERSION
+     -D_WIN32_WINNT=_WIN32_WINNT_VISTA
+-- 
+2.46.0.windows.1
+