hunter_setup_msvc: support Visual Studio 18 2026 toolset (#843)

Add support for `Visual Studio 18 2026` compiler suite.

* CI: set_matrix: support `Visual Studio 18 2026` generator
* CI: add VS-18-2026 build on beta image `windows-2025-vs2026`
* test_setup_msvc: add check for 1950 -> VS 18 2026

Fixes: #842

Author: NeroBurner

.github/workflows/ci/matrix.json

@@ -13,6 +13,7 @@
 { "example": "foo", "toolchain": "nmake-vs-17-2022-win64-cxx17",                    "os": "windows-2022" },
 { "example": "foo", "toolchain": "vs-17-2022-win64-sdk-10-0-22000-0-cxx17",         "os": "windows-2022" },
 { "example": "foo", "toolchain": "vs-17-2022-win64-store-10-cxx17",                 "os": "windows-2022" },
+{ "example": "foo", "toolchain": "ninja-vs-18-2026-win64-cxx17",                    "os": "windows-2025-vs2026" },
 { "example": "foo", "toolchain": "mingw-cxx17",                                     "os": "windows-2022" },
 { "example": "foo", "toolchain": "msys-cxx17",                                      "os": "windows-2022" }
 ]

.github/workflows/set_matrix.py

@@ -309,6 +309,13 @@ def generator_and_runscript(leg: dict):
                 )
             generator_str = "Visual Studio 17 2022"
             vcvarsall = "C:\\Program Files\\Microsoft Visual Studio\\2022\\Enterprise\\Common7\\Tools\\VsDevCmd.bat"
+        elif vs_version == "18":
+            if vs_year != "2026":
+                raise RuntimeError(
+                    f"project: {project_name}: VS 18 expected to have year 2026"
+                )
+            generator_str = "Visual Studio 18 2026"
+            vcvarsall = "C:\\Program Files\\Microsoft Visual Studio\\18\\Enterprise\\Common7\\Tools\\VsDevCmd.bat"
         else:
             raise RuntimeError(
                 f"project: {project_name}: unhandled vs-generator: {m.group()} in toolchain: {toolchain}"

cmake/modules/hunter_setup_msvc.cmake

@@ -67,6 +67,7 @@ macro(hunter_setup_msvc)
     string(REGEX MATCH "^191[0-9]$" _vs_15_2017 "${MSVC_VERSION}")
     string(REGEX MATCH "^192[0-9]$" _vs_16_2019 "${MSVC_VERSION}")
     string(REGEX MATCH "^19[34][0-9]$" _vs_17_2022 "${MSVC_VERSION}")
+    string(REGEX MATCH "^195[0-9]$" _vs_18_2026 "${MSVC_VERSION}")
 
     if(_vs_8_2005)
       set(HUNTER_MSVC_VERSION "8")
@@ -95,6 +96,9 @@ macro(hunter_setup_msvc)
     elseif(_vs_17_2022)
       set(HUNTER_MSVC_VERSION "17")
       set(HUNTER_MSVC_YEAR "2022")
+    elseif(_vs_18_2026)
+      set(HUNTER_MSVC_VERSION "18")
+      set(HUNTER_MSVC_YEAR "2026")
     else()
       hunter_internal_error("Unexpected MSVC_VERSION: '${MSVC_VERSION}'")
     endif()

tests/hunter_setup_msvc/CMakeLists.txt

@@ -114,6 +114,8 @@ run_check("1920" "x64" "" "x86_amd64" "x86" "amd64" "16" "2019")
 run_check("1930" "x64" "" "x86_amd64" "x86" "amd64" "17" "2022")
 run_check("1920" "x64" "x64" "amd64" "amd64" "amd64" "16" "2019")
 run_check("1930" "x64" "x64" "amd64" "amd64" "amd64" "17" "2022")
+run_check("1940" "x64" "x64" "amd64" "amd64" "amd64" "17" "2022")
+run_check("1950" "x64" "x64" "amd64" "amd64" "amd64" "18" "2026")
 
 # building for armv7
 run_check("1400" "ARMV7" "" "x86_arm" "x86" "arm" "8" "2005")