CMake, setting a macro from a console program [SOLVED]

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Hi, I’m Making the portablity of a code to CMake. The code needs that CMake defines Macro with last short head from git.

If I define the value maually,

target_compile_definitions(LibDEFINES PRIVATE
	GITVER=3686e892
)

There is no problem, the code compiles, only with a warning

317:13: warning: floating constant exceeds range of ‘double’ [-Woverflow]
             .arg(GITVER)
         ^

The problem comes when I try to extract automatic the macro value from the git command

execute_process (
    COMMAND bash -c "git rev-parse --short HEAD"
    OUTPUT_VARIABLE GIT_VER
)

message(WARNING "MiMENSAJE\t" ${GIT_VER})    //Prints to console the right value 3686e892

target_compile_definitions(LibDEFINES PRIVATE
	GITVER=${GIT_VER}
)

but, I guess, the variable is not well defined, because, the compile process, stops with a strange error and yet compiles fine when is manual defined

A_Typedef.h:552:5: error: ‘Sem’ does not name a type
     Sem*   semPS;

My first assumption is that GIT_VER is declared like string, but I have no idea, perhaps I don’t use the right procedure to Set the macro.

How should I correctly define the macro from git command?

Thanks in advance.