[scripts-audit] Make buildsystem

docs/maintainers/portfile-functions.md

@@ -5,6 +5,7 @@
 - [vcpkg\_acquire\_msys](vcpkg_acquire_msys.md)
 - [vcpkg\_add\_to\_path](vcpkg_add_to_path.md)
 - [vcpkg\_apply\_patches](vcpkg_apply_patches.md) (deprecated)
+- [vcpkg\_backup\_restore\_env\_vars](vcpkg_backup_restore_env_vars.md)
 - [vcpkg\_build\_cmake](vcpkg_build_cmake.md) (deprecated, use [vcpkg\_cmake\_build](ports/vcpkg-cmake/vcpkg_cmake_build.md))
 - [vcpkg\_build\_make](vcpkg_build_make.md)
 - [vcpkg\_build\_msbuild](vcpkg_build_msbuild.md)

docs/maintainers/vcpkg_backup_restore_env_vars.md

@@ -0,0 +1,27 @@
+# vcpkg_backup_restore_env_vars
+
+The latest version of this document lives in the [vcpkg repo](https://github.com/Microsoft/vcpkg/blob/master/docs/maintainers/vcpkg_backup_restore_env_vars.md).
+
+Backup or restore the environment variables
+
+## Usage:
+```cmake
+vcpkg_backup_env_variables(VARS <ENV_VARS>)
+```
+
+```cmake
+vcpkg_restore_env_variables(VARS <ENV_VARS>)
+```
+
+### ENV_VARS
+The target passed to the make build command (`./make <target>`). If not specified, the 'all' target will
+be passed.
+And the backup variable is `z_vcpkg_env_backup_${ENV_VARS}`.
+
+## Notes:
+This command should be preceded by a call to [`vcpkg_backup_env_variables()`](vcpkg_backup_env_variables.md) or
+[`vcpkg_restore_env_variables()`](vcpkg_restore_env_variables.md).
+
+
+## Source
+[scripts/cmake/vcpkg\_backup\_restore\_env\_vars.cmake](https://github.com/Microsoft/vcpkg/blob/master/scripts/cmake/vcpkg_backup_restore_env_vars.cmake)

ports/x264/portfile.cmake

@@ -17,8 +17,8 @@ get_filename_component(NASM_EXE_PATH ${NASM} DIRECTORY)
 vcpkg_add_to_path(${NASM_EXE_PATH})
 
 if(VCPKG_TARGET_IS_WINDOWS)
-    _vcpkg_determine_autotools_host_cpu(BUILD_ARCH)
-    _vcpkg_determine_autotools_target_cpu(HOST_ARCH)
+    z_vcpkg_determine_autotools_host_cpu(BUILD_ARCH)
+    z_vcpkg_determine_autotools_target_cpu(HOST_ARCH)
     list(APPEND OPTIONS --build=${BUILD_ARCH}-pc-mingw32)
     list(APPEND OPTIONS --host=${HOST_ARCH}-pc-mingw32)
     set(ENV{AS} "${NASM}")

ports/x264/vcpkg.json

@@ -1,7 +1,7 @@
 {
   "name": "x264",
   "version-string": "157-303c484ec828ed0",
-  "port-version": 15,
+  "port-version": 16,
   "description": "x264 is a free software library and application for encoding video streams into the H.264/MPEG-4 AVC compression format",
   "homepage": "https://github.com/mirror/x264",
   "supports": "!arm",

scripts/cmake/vcpkg_backup_restore_env_vars.cmake

@@ -0,0 +1,62 @@
+#[===[.md:
+# vcpkg_backup_restore_env_vars
+
+Backup or restore the environment variables
+
+## Usage:
+```cmake
+vcpkg_backup_env_variables(VARS <ENV_VARS>)
+```
+
+```cmake
+vcpkg_restore_env_variables(VARS <ENV_VARS>)
+```
+
+### ENV_VARS
+The target passed to the make build command (`./make <target>`). If not specified, the 'all' target will
+be passed.
+And the backup variable is `z_vcpkg_env_backup_${ENV_VARS}`.
+
+## Notes:
+This command should be preceded by a call to [`vcpkg_backup_env_variables()`](vcpkg_backup_env_variables.md) or
+[`vcpkg_restore_env_variables()`](vcpkg_restore_env_variables.md).
+
+#]===]
+
+function(vcpkg_backup_env_variables)
+    cmake_parse_arguments(PARSE_ARGV 0 arg "" "" "VARS")
+    if(NOT DEFINED arg_VARS)
+        message(FATAL_ERROR "VARS must be defined.")
+    endif()
+    if(DEFINED arg_UNPARSED_ARGUMENTS)
+        message(FATAL_ERROR "${CMAKE_CURRENT_FUNCTION} was passed extra arguments: ${arg_UNPARSED_ARGUMENTS}")
+    endif()
+
+    foreach(envvar IN LISTS arg_VARS)
+        if(DEFINED ENV{${envvar}})
+            debug_message("backup ENV\{${envvar}\} to z_vcpkg_env_backup_${envvar}")
+            set("z_vcpkg_env_backup_${envvar}" "$ENV{${envvar}}" PARENT_SCOPE)
+        else()
+            unset(z_vcpkg_env_backup_${envvar})
+        endif()
+    endforeach()
+endfunction()
+
+function(vcpkg_restore_env_variables)
+    cmake_parse_arguments(PARSE_ARGV 0 arg "" "" "VARS")
+    if(NOT DEFINED arg_VARS)
+        message(FATAL_ERROR "VARS must be defined.")
+    endif()
+    if(DEFINED arg_UNPARSED_ARGUMENTS)
+        message(FATAL_ERROR "${CMAKE_CURRENT_FUNCTION} was passed extra arguments: ${arg_UNPARSED_ARGUMENTS}")
+    endif()
+
+    foreach(envvar IN LISTS arg_VARS)
+        if(DEFINED z_vcpkg_env_backup_${envvar})
+            debug_message("restore ENV\{${envvar}\} from z_vcpkg_env_backup_${envvar}")
+            set(ENV{${envvar}} "${z_vcpkg_env_backup_${envvar}}")
+        else()
+            unset(ENV{${envvar}})
+        endif()
+    endforeach()
+endfunction()