ag_check_posix_regcomp

Check that the POSIX compliant regular expression compiler is available in the POSIX specified manner, and it works. If it fails, we have a backup -- use gnu-regex.

AC_DEFUN([AG_CHECK_POSIX_REGCOMP],[
  AC_MSG_CHECKING([whether POSIX compliant regcomp()/regexec()])
  AC_CACHE_VAL([ag_cv_posix_regcomp],[
  AC_TRY_RUN([#include <sys/types.h>
#include <regex.h>
int main() {
  int flags = REG_EXTENDED|REG_ICASE|REG_NEWLINE;
  regex_t  re;
  if (regcomp( &re, "^.*$", flags ) != 0)
    return 1;
  return regcomp( &re, "|no.*", flags ); }],[ag_cv_posix_regcomp=yes],[ag_cv_posix_regcomp=no],[ag_cv_posix_regcomp=no]
  ) # end of TRY_RUN]) # end of CACHE_VAL

  AC_MSG_RESULT([$ag_cv_posix_regcomp])
  if test x$ag_cv_posix_regcomp = xyes
  then
    AC_DEFINE(HAVE_POSIX_REGCOMP, 1,
       [Define this if POSIX compliant regcomp()/regexec()])
  fi
]) # end of AC_DEFUN of AG_CHECK_POSIX_REGCOMP

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