[vcpkg/scripts] Add a way to get cmake compiler settings/flags (#12936)

* add function get_cmake_vars

* fine tuning.

* apply to make based ports.

* add log suffix on not windows platforms

* fix c&p error

* add previous LINK env

* setup env on windows and extract cpp flags correctly.

* Apply suggestions from code review

* commit changes from fontconfig PR

* Apply suggestions from code review

Co-authored-by: nicole mazzuca <mazzucan@outlook.com>

* cleanup docs

* add conversion from somelib.lib to -lsomelib

* add missing ar-lib wrapper

* small but important regex correction

* add latest changes from update_fontconfig PR

* Apply suggestions from code review

first set which don't need special attention

Co-authored-by: ras0219 <533828+ras0219@users.noreply.github.com>

* Apply suggestions from code review

one more simple change

Co-authored-by: ras0219 <533828+ras0219@users.noreply.github.com>

* [x264] set env AS

* fix bugs due to refactor

* use subpath everywhere

* apply changes from CR

* remove unnecessary lines 41 & 44

* remove flag transformation

* reintroduce the flag / to - transformation for MSVC

* Apply suggestions from code review

Co-authored-by: ras0219 <533828+ras0219@users.noreply.github.com>

* rename the function

* rename function/variables

* transform flags list

* Apply suggestions from code review

* fix vcpkg_build_make due to the variable name change

* fix another case of function renaming regressions

* only rename config.log if it exists

* actually add the script after vcpkg_common_functions was deleted.

* remove setting of ldflags if path contains spaces

Co-authored-by: nicole mazzuca <mazzucan@outlook.com>
Co-authored-by: ras0219 <533828+ras0219@users.noreply.github.com>

1 files changed, 124 insertions, 0 deletions

diff --git a/scripts/get_cmake_vars/CMakeLists.txt b/scripts/get_cmake_vars/CMakeLists.txt
new file mode 100644
index 000000000..283f4ef87
--- /dev/null
+++ b/scripts/get_cmake_vars/CMakeLists.txt
@@ -0,0 +1,124 @@
+cmake_minimum_required(VERSION 3.17)

+

+set(VCPKG_LANGUAGES "C;CXX" CACHE STRING "Languages to enables for this project")

+

+set(OUTPUT_STRING)

+# Build default checklists

+list(APPEND VCPKG_DEFAULT_VARS_TO_CHECK CMAKE_CROSSCOMPILING

+                                        CMAKE_SYSTEM_NAME

+                                        CMAKE_HOST_SYSTEM_NAME

+                                        CMAKE_SYSTEM_PROCESSOR

+                                        CMAKE_HOST_SYSTEM_PROCESSOR)

+# Programs to check

+set(PROGLIST AR RANLIB STRIP NM OBJDUMP DLLTOOL MT LINKER)

+foreach(prog IN LISTS PROGLIST)

+    list(APPEND VCPKG_DEFAULT_VARS_TO_CHECK CMAKE_${prog})

+endforeach()

+set(COMPILERS ${VCPKG_LANGUAGES} RC)

+foreach(prog IN LISTS COMPILERS)

+    list(APPEND VCPKG_DEFAULT_VARS_TO_CHECK CMAKE_${prog}_COMPILER)

+endforeach()

+# Variables to check

+foreach(_lang IN LISTS VCPKG_LANGUAGES)

+    list(APPEND VCPKG_DEFAULT_VARS_TO_CHECK CMAKE_${_lang}_STANDARD_INCLUDE_DIRECTORIES)

+    list(APPEND VCPKG_DEFAULT_VARS_TO_CHECK CMAKE_${_lang}_STANDARD_LIBRARIES)

+    list(APPEND VCPKG_DEFAULT_VARS_TO_CHECK CMAKE_${_lang}_STANDARD)

+    list(APPEND VCPKG_DEFAULT_VARS_TO_CHECK CMAKE_${_lang}_COMPILE_FEATURES)

+    list(APPEND VCPKG_DEFAULT_VARS_TO_CHECK CMAKE_${_lang}_EXTENSION)

+    # Probably never required since implicit. 

+    #list(APPEND VCPKG_DEFAULT_VARS_TO_CHECK CMAKE_${_lang}_IMPLICIT_LINK_FRAMEWORK_DIRECTORIES)

+    #list(APPEND VCPKG_DEFAULT_VARS_TO_CHECK CMAKE_${_lang}_IMPLICIT_INCLUDE_DIRECTORIES)

+    #list(APPEND VCPKG_DEFAULT_VARS_TO_CHECK CMAKE_${_lang}_IMPLICIT_LINK_DIRECTORIES)

+    #list(APPEND VCPKG_DEFAULT_VARS_TO_CHECK CMAKE_${_lang}_IMPLICIT_LINK_LIBRARIES)

+endforeach()

+list(REMOVE_DUPLICATES VCPKG_DEFAULT_VARS_TO_CHECK)

+

+# Environment variables to check. 

+list(APPEND VCPKG_DEFAULT_ENV_VARS_TO_CHECK PATH INCLUDE C_INCLUDE_PATH CPLUS_INCLUDE_PATH LIB LIBPATH LIBRARY_PATH LD_LIBRARY_PATH)

+list(REMOVE_DUPLICATES VCPKG_DEFAULT_ENV_VARS_TO_CHECK)

+

+#Flags to check. Flags are a bit special since they are configuration aware. 

+set(FLAGS ${VCPKG_LANGUAGES} RC SHARED_LINKER STATIC_LINKER EXE_LINKER)

+foreach(flag IN LISTS FLAGS)

+    list(APPEND VCPKG_DEFAULT_FLAGS_TO_CHECK CMAKE_${flag}_FLAGS)

+endforeach()

+list(REMOVE_DUPLICATES VCPKG_DEFAULT_FLAGS_TO_CHECK)

+

+# TODO if ever necessary: Properties to check

+

+set(VCPKG_VAR_PREFIX "VCPKG_DETECTED" CACHE STRING "Variable prefix to use for detected flags")

+set(VCPKG_VARS_TO_CHECK "${VCPKG_DEFAULT_VARS_TO_CHECK}" CACHE STRING "Variables to check. If not given there is a list of defaults")

+set(VCPKG_FLAGS_TO_CHECK "${VCPKG_DEFAULT_FLAGS_TO_CHECK}" CACHE STRING "Variables to check. If not given there is a list of defaults")

+set(VCPKG_ENV_VARS_TO_CHECK "${VCPKG_DEFAULT_ENV_VARS_TO_CHECK}" CACHE STRING "Variables to check. If not given there is a list of defaults")

+

+if(NOT VCPKG_OUTPUT_FILE)

+    message(FATAL_ERROR "VCPKG_OUTPUT_FILE is required to be defined")

+endif()

+

+if(NOT CMAKE_BUILD_TYPE)

+    message(FATAL_ERROR "CMAKE_BUILD_TYPE is required to be defined")

+else()

+    string(TOUPPER "${CMAKE_BUILD_TYPE}" VCPKG_CONFIGS)

+endif()

+

+

+project(get_cmake_vars LANGUAGES ${VCPKG_LANGUAGES})

+

+foreach(VAR IN LISTS VCPKG_VARS_TO_CHECK)

+  string(APPEND OUTPUT_STRING "set(${VCPKG_VAR_PREFIX}_${VAR} \"${${VAR}}\")\n")

+endforeach()

+

+foreach(_env IN LISTS VCPKG_ENV_VARS_TO_CHECK)

+    IF(WIN32)

+        string(REPLACE "\\" "/" ENV_${_env} "$ENV{${_env}}")

+        string(APPEND OUTPUT_STRING "set(${VCPKG_VAR_PREFIX}_ENV_${_env} \"${ENV_${_env}}\")\n")

+    else()

+        string(APPEND OUTPUT_STRING "set(${VCPKG_VAR_PREFIX}_ENV_${_env} \"$ENV{${_env}}\")\n")

+    endif()

+endforeach()

+

+foreach(flag IN LISTS VCPKG_FLAGS_TO_CHECK)

+    string(STRIP "${${flag}}" ${flag}) # Strip leading and trailing whitespaces

+    if(MSVC) # Transform MSVC /flags to -flags due to bash scripts intepreting /flag as a path. 

+        string(REGEX REPLACE "(^| )/" "\\1-" ${flag} "${${flag}}")

+    endif()

+    string(APPEND OUTPUT_STRING "set(${VCPKG_VAR_PREFIX}_RAW_${flag} \" ${${flag}}\")\n")

+    foreach(config IN LISTS VCPKG_CONFIGS)

+        string(STRIP "${${flag}_${config}}" ${flag}_${config})

+        if(MSVC)

+            string(REGEX REPLACE "(^| )/" "\\1-" ${flag}_${config} "${${flag}_${config}}")

+        endif()

+        string(APPEND OUTPUT_STRING "set(${VCPKG_VAR_PREFIX}_RAW_${flag}_${config} \"${CMAKE_${flag}_FLAGS_${config}}\")\n")

+        set(COMBINED_${flag}_${config} "${${flag}} ${${flag}_${config}}")

+        string(STRIP "${COMBINED_${flag}_${config}}" COMBINED_${flag}_${config})

+        string(APPEND OUTPUT_STRING "set(${VCPKG_VAR_PREFIX}_${flag}_${config} \"${COMBINED_${flag}_${config}}\")\n")

+    endforeach()

+endforeach()

+

+

+file(WRITE "${VCPKG_OUTPUT_FILE}" "${OUTPUT_STRING}")

+

+# Programs:

+# CMAKE_AR

+# CMAKE_<LANG>_COMPILER_AR (Wrapper)

+# CMAKE_RANLIB

+# CMAKE_<LANG>_COMPILER_RANLIB

+# CMAKE_STRIP

+# CMAKE_NM

+# CMAKE_OBJDUMP

+# CMAKE_DLLTOOL

+# CMAKE_MT

+# CMAKE_LINKER

+# CMAKE_C_COMPILER

+# CMAKE_CXX_COMPILER

+# CMAKE_RC_COMPILER

+

+# Flags:

+# CMAKE_<LANG>_FLAGS

+# CMAKE_<LANG>_FLAGS_<CONFIG>

+# CMAKE_RC_FLAGS

+# CMAKE_SHARED_LINKER_FLAGS

+# CMAKE_STATIC_LINKER_FLAGS

+# CMAKE_STATIC_LINKER_FLAGS_<CONFIG>

+# CMAKE_EXE_LINKER_FLAGS

+# CMAKE_EXE_LINKER_FLAGS_<CONFIG>