Reproducing compiler flags

Let us now try to adjust the compiler flags to mirror the reference build.

Defining compiler flags

So far, we have not defined any custom compiler flags, but from the reference Autotools build, we remember that the code was compiled with -g -U_FORTIFY_SOURCE
-D_FORTIFY_SOURCE=1 -O2 using the GNU C compiler.

Our first approach could be to define the following:

if(CMAKE_C_COMPILER_ID MATCHES GNU)
    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -g -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1 -O2")
endif()

And, we would place this code on top of src/CMakeLists.txt, right before generating source files (since pathdef.c uses ${CMAKE_C_FLAGS}):

# <- we will define flags right here

include(autogenerate.cmake...