BLD / two fixes in build process

[jannesklee]

• enable C and CXX as languages which seems to be necessary to compile
• set default RELEASE if nothing is set as build type
  • alternatively the README would need to be changed

[tillense]

Hi Jannes, I would suggest to replace your code regarding the second issue by

-set (CMAKE_BUILD_TYPE RELEASE CACHE STRING "Should be one of RELEASE, DEBUG, PROFILING; default: RELEASE")
-if(NOT CMAKE_BUILD_TYPE)
-  set(CMAKE_BUILD_TYPE "RELEASE" CACHE STRING "Build type" FORCE)
-endif()
+set (CMAKE_BUILD_TYPE "RELEASE" CACHE STRING "Should be one of RELEASE, DEBUG, PROFILING; default: RELEASE" FORCE)
+set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS ${CMAKE_BUILD_TYPE_NAMES})

[jannesklee]

Hi Tobias, below is my output, when not using the enable_language commands. I used cmake version 3.31.5 to run it.

jklee@deneb:~/src/fosite/build$ cmake ..
-- Found Git: /usr/bin/git (found version "2.48.1")
CMake Error at /usr/share/cmake/Modules/Internal/CheckSourceCompiles.cmake:51 (message):
  check_source_compiles: CXX: needs to be enabled before use.
Call Stack (most recent call first):
  /usr/share/cmake/Modules/CheckCXXSourceCompiles.cmake:58 (cmake_check_source_compiles)
  /usr/lib/cmake/llvm/FindFFI.cmake:62 (check_cxx_source_compiles)
  /usr/lib/cmake/llvm/LLVMConfig.cmake:261 (find_package)
  CMakeLists.txt:44 (find_package)


-- Could NOT find FFI (missing: HAVE_FFI_CALL) 
-- Looking for histedit.h
CMake Error at /usr/share/cmake/Modules/CheckIncludeFile.cmake:99 (try_compile):
  Unknown extension ".c" for file

    /home/jklee/src/fosite/build/CMakeFiles/CMakeScratch/TryCompile-GMrg2Y/CheckIncludeFile.c

  try_compile() works only for enabled languages.  Currently these are:

    NONE

  See project() command to enable other languages.
Call Stack (most recent call first):
  /usr/lib/cmake/llvm/FindLibEdit.cmake:28 (check_include_file)
  /usr/lib/cmake/llvm/LLVMConfig.cmake:268 (find_package)
  CMakeLists.txt:44 (find_package)


-- Looking for histedit.h - not found
-- Could NOT find LibEdit (missing: LibEdit_INCLUDE_DIRS LibEdit_LIBRARIES) 
-- Found ZLIB: /usr/lib/libz.so (found version "1.3.1")
CMake Error at /usr/share/cmake/Modules/FindThreads.cmake:66 (message):
  FindThreads only works if either C or CXX language is enabled
Call Stack (most recent call first):
  /usr/share/cmake/Modules/CMakeFindDependencyMacro.cmake:76 (find_package)
  /usr/lib/cmake/zstd/zstdConfig.cmake:39 (find_dependency)
  /usr/lib/cmake/llvm/LLVMConfig.cmake:283 (find_package)
  CMakeLists.txt:44 (find_package)


-- Configuring incomplete, errors occurred!