[WIP] first working CMakeLists.txt

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.16)
+
+project(Trexio 
+	VERSION 2.0.0 
+	DESCRIPTION "TREX I/O library" 
+	LANGUAGES C Fortran
+	)
+
+set(CMAKE_C_STANDARD 99)
+set(CMAKE_C_STANDARD_REQUIRED ON)
+
+option(ENABLE_HDF5 "Enable HDF5 support" ON)
+
+if(ENABLE_HDF5)
+  find_package(HDF5 REQUIRED)
+  if(HDF5_FOUND)
+    message(STATUS "HDF5 version     :: ${HDF5_VERSION}")
+    message(STATUS "HDF5 include dir :: ${HDF5_INCLUDE_DIRS}")
+    message(STATUS "HDF5 libraries   :: ${HDF5_C_LIBRARIES}")
+  else()
+    # Download and install HDF5 library using FetchContent
+    # ...
+  endif()
+endif()
+
+#IF DO_SHARED
+add_library(trexio SHARED
+	src/trexio.c
+	src/trexio_hdf5.c
+	src/trexio_text.c
+	)
+#ELIF DO_STATIC
+
+#ENDIF
+
+set_target_properties(trexio PROPERTIES 
+	VERSION ${PROJECT_VERSION}
+	PUBLIC_HEADER include/trexio.h
+	)
+
+target_include_directories(trexio PRIVATE 
+	include 
+	src
+	)
+
+if(ENABLE_HDF5)
+  target_include_directories(trexio PRIVATE ${HDF5_C_INCLUDE_DIRS})
+  target_link_libraries(trexio PRIVATE ${HDF5_C_LIBRARIES})
+endif()
+
+
+include(GNUInstallDirs)
+install(TARGETS trexio
+    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+    PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+    )
+
+