[Build] Make powershell optional on non-Windows (#1248)

Fixes: #1247

CMakeLists.txt

@@ -28,7 +28,7 @@ if(WIN32)
         HINTS "/Windows/System32/WindowsPowerShell/v1.0"
         REQUIRED)
 else()
-    find_program(POWERSHELL pwsh REQUIRED)
+    find_program(POWERSHELL pwsh)
 endif()
 
 include(Set-Toolchain-vcpkg)

cmake/MakeReleaseCommitAndTag.cmake

@@ -184,8 +184,10 @@ Ignore the following cmake error.
     endwhile()
 
     # Convert to UNIX line endings on Windows, just copy the file otherwise.
-
     if(CMAKE_HOST_SYSTEM MATCHES Windows OR ((NOT DEFINED CMAKE_HOST_SYSTEM) AND WIN32))
+        if(NOT DEFINED POWERSHELL)
+            message(FATAL_ERROR "Powershell is required to convert line endings on Windows.")
+        endif()
         execute_process(
             COMMAND ${POWERSHELL} -NoLogo -NoProfile -ExecutionPolicy Bypass -Command [=[
                 $text = [IO.File]::ReadAllText("CHANGELOG.md.work") -replace "`r`n", "`n"

cmake/Set-Toolchain-vcpkg.cmake

@@ -320,6 +320,9 @@ function(vcpkg_remove_optional_deps vcpkg_exe)
 endfunction()
 
 function(vcpkg_set_toolchain)
+    if(NOT DEFINED POWERSHELL)
+        message(FATAL_ERROR "Powershell is required to use vcpkg binaries.")
+    endif()
     if(NOT DEFINED ENV{VCPKG_ROOT})
         get_filename_component(preferred_root ${CMAKE_SOURCE_DIR}/../vcpkg ABSOLUTE)
 

cmake/UpdateAppcast.cmake

@@ -75,8 +75,10 @@ Ignore the following cmake error.
     endwhile()
 
     # Convert to UNIX line endings on Windows, just copy the file otherwise.
-
     if(CMAKE_HOST_SYSTEM MATCHES Windows OR ((NOT DEFINED CMAKE_HOST_SYSTEM) AND WIN32))
+        if(NOT DEFINED POWERSHELL)
+            message(FATAL_ERROR "Powershell is required to convert line endings on Windows.")
+        endif()
         execute_process(
             COMMAND ${POWERSHELL} -NoLogo -NoProfile -ExecutionPolicy Bypass -Command [=[
                 $text = [IO.File]::ReadAllText("appcast.xml.work") -replace "`r`n", "`n"

src/wx/CMakeLists.txt

@@ -158,6 +158,9 @@ if(WIN32 AND CMAKE_TOOLCHAIN_FILE MATCHES "vcpkg")
     set(ENV{PATH} "${dbg_prefix}/bin;${common_prefix}/bin;$ENV{PATH}")
 
     if(NOT ZIP_PROGRAM AND NOT EXISTS ${CMAKE_CURRENT_BINARY_DIR}/zip.exe)
+        if(NOT DEFINED POWERSHELL)
+            message(FATAL_ERROR "Powershell is required for extraction.")
+        endif()
         # get zip binary for wxrc
         file(DOWNLOAD "https://www.willus.com/archive/zip64/infozip_binaries_win32.zip" ${CMAKE_CURRENT_BINARY_DIR}/infozip_binaries_win32.zip)
         # unzip it