Where do the keywords floc and RETSIGTYPE come from in the following extract of this C code?
struct commands
{
floc fileinfo; /* Where commands were defined. */
char *commands; /* Commands text. */
char **command_lines; /* Commands chopped up into lines. */
unsigned char *lines_flags; /* One set of flag bits for each line. */
unsigned short ncommand_lines;/* Number of command lines. */
char recipe_prefix; /* Recipe prefix for this command set. */
unsigned int any_recurse:1; /* Nonzero if any 'lines_flags' elt has */
/* the COMMANDS_RECURSE bit set. */
};
/* ... */
RETSIGTYPE fatal_error_signal (int sig);
This is one of the files in the make repository. I am wondering: since this .h file does not include any other header file, how can they be used here?
The symbols you are asking for are defined in the following way:
#ifndef RETSIGTYPE
# define RETSIGTYPE void
#endif
/* Specify the location of elements read from makefiles. */
typedef struct
{
const char *filenm;
unsigned long lineno;
unsigned long offset;
} floc;
Both definitions are contained by file makeint.h.
The reason why in commands.h these symbols are "visible" even if it doesn't include any header file is simply because every *.c file including it (for example commands.c) include makeint.h as well before it.
I'm not an expert of the project you linked. I just
git clone git://git.savannah.gnu.org/make.git