(How) can I generate with cmake a header file that include header files?

Question

i have a project that has several header files. I want now to generate a header file that includes all project header files.

For example we have the following headers:

• a.h
• b.h
• c.h
• ext/d.h

Now I want to generate a header file that includes all header files and looks approximately like that:

#include "a.h"
#include "b.h"
#include "c.h"
#include "ext/d.h"

Thanks for any kind of help.

Answer 1

file(GLOB_RECURSE header_files "include/*.h")
foreach(f ${header_files})
  message("processing ${f}")
  file(RELATIVE_PATH fr "${CMAKE_CURRENT_SOURCE_DIR}/include" ${f})
  list(APPEND incls "#include \"${fr}\"\n")
endforeach()
file(WRITE mylibheader.h ${incls})

Description:

• file(GLOB_RECURSE ...) stores all header files to the variable header_files.
• file(RELATIVE_PATH ...) determines relative path from absolute path generated by GLOB
• list(APPEND ...) stores the c include code snippet to the variable
• file(WRITE...) creates the header file