MKC_CHECK_DECL(1)

NAME
mkc_check_decl - checks for define, variable, function, type, member or function prototype.

SYNOPSIS
mkc_check_decl [OPTIONS] <check_type> <what> [headers...]

DESCRIPTION
check_type is either define, variable, func[0-9], funcordefine[0-9], type, member or prototype. Depending on its value mkc_check_decl checks respectively for define, variable, function with the specified number of arguments (or equivalent define in case of funcordefine[0-9]), data type, member of structure or a function prototype in the specified headers by compiling a test program. headers is either a single header file or a list of headers, separated by comma. As a result mkc_check_decl prints either 1 (success) or 0 (failure) to stdout. By default, temporary and cache files _mkc_<check_type>_<what>_<lheader_h>.{c,err,res} are created under MKC_CACHEDIR directory. Here, lheader_h is the last header from comma-separated list headers.

OPTIONS

-h  display help message

ENVIRONMENT

CC  Compiler. By default cc is used.

CPPFLAGS, CFLAGS
    Options passed to the compiler, for example -I for additional directories that contain header files.

MKC_VERBOSE
    If set to 1, verbose messages are output to stderr.

MKC_SHOW_CACHED
    If set to 1 and MKC_VERBOSE is set to 1, cached results are output to stderr.

MKC_COMMON_HEADERS
    List of header files to add to .c test program.

MKC_CACHEDIR
    Directory where temporary and cache files are created. If unset they are created in a current directory.

MKC_NOCACHE
    All results are cached unless MKC_NOCACHE variable is set to 1.

MKC_DELETE_TMPFILES
    If set to 1, temporary files are removed.

EXAMPLES
   mkc_check_decl define __GNUC__
   mkc_check_decl define RTLD_LAZY dlfcn.h
   mkc_check_decl define FTS_W sys/types.h,sys/stat.h,fts.h
   mkc_check_decl variable sys_errlist errno.h
   mkc_check_decl variable __malloc_hook malloc.h
   mkc_check_decl func3 poll poll.h
   mkc_check_decl func2 fgetln stdio.h
   mkc_check_decl type mbstate_t wchar.h
   mkc_check_decl type long-long
   mkc_check_decl member tm.tm_isdst time.h
   mkc_check_decl member ifreq.ifr_addr.sa_len net/if.h
   mkc_check_decl member struct-stat.st_mtimespec sys/stat.h
   mkc_check_decl prototype 'int connect(int,const struct sockaddr*,socklen_t)' sys/socket.h
   mkc_check_decl prototype 'int connect(int,struct sockaddr*,socklen_t)' sys/socket.h

C FILE CONTENT

define
    #include <header1.h>
     ... #include <headerN.h> #if defined(WHAT) int func(void) {
       return 0; } #else #error "WHAT is not a define" #endif

variable
    #include <header1.h>
     ... #include <headerN.h> int func(void) {
       return sizeof ((WHAT)) && (&WHAT != 0); }

func3 (example for function with 3 arguments)
    #include <header1.h>
     ... #include <headerN.h> void func (void) {
       if (WHAT) return;
       WHAT(0,0,0); }

funcordefine3 (example for function/define with 3 arguments)
    #include <header1.h>
     ... #include <headerN.h> void func (void) {
       WHAT(0,0,0); }

type
    #include <header1.h>
     ... #include <headerN.h> int func(void) {
       return sizeof (WHAT); }

member  (example for struct stat.st_mtimespec)
    #include <sys/stat.h> int func(void) {
       struct_stat var;
       return sizeof (var.st_mtimespec); }

prototype (example for void ttt(int,char**) function)
    #include <header1.h>
     ... #include <headerN.h> void func (void); void func2 (void); void func (void) {
       if (ttt) return; } void ttt(int, char**); void func2 (void) {
       if (ttt) return; }

AUTHOR
Aleksey Cheusov <vle@gmx.net>