stringify MAKE_SQLSTATE()

Hi!

Following discussion at https://commitfest.postgresql.org/5/190/ patch, I found
(at seems to me) a way to stringify MAKE_SQLSTATE(), the idea is to use char
array as string:

#include <stdio.h>

#define MAKE_SQLSTATE(ch1,ch2,ch3,ch4,ch5) \

((char[]){(char)(ch1),(char)(ch2),(char)(ch3),(char)(ch4),(char)(ch5),(char)'\0'})

#define ERRCODE_WARNING_DEPRECATED_FEATURE MAKE_SQLSTATE('0','1','P','0','1')

int
main(int argn, char* argv[])
{
char *x = ERRCODE_WARNING_DEPRECATED_FEATURE;

printf("%s\n", x);

return 0;
}

That works for clang ang gcc48 with flags -Wall -Wextra -ansi (or -std=c90)
without warnings, but doesn't work with -pedantic. Is that enough to to work
with other compilers?

--
Teodor Sigaev E-mail: teodor(at)sigaev(dot)ru
WWW: http://www.sigaev.ru/