minor portability fixes; printf now uses double for floating point conversions by default in posix mode

m4/strtoimax.m4

@@ -0,0 +1,35 @@
+dnl Copyright (C) 2022 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+dnl Make sure we replace strtoimax if we don't have a declaration
+dnl We can use this as a template for future function checks
+
+AC_DEFUN([BASH_FUNC_STRTOIMAX], [
+AC_MSG_CHECKING([for usable strtoimax])
+AC_CACHE_VAL(bash_cv_func_strtoimax,
+[
+  HAVE_STRTOIMAX=0 HAVE_DECL_STRTOIMAX=0
+
+  AC_CHECK_FUNCS([strtoimax])
+  AC_CHECK_DECLS([strtoimax])
+
+  if test "$ac_cv_func_strtoimax" = "yes" ; then
+    HAVE_STRTOIMAX=1
+  fi
+  if test "$ac_cv_have_decl_strtoimax" = "yes" ; then
+    HAVE_DECL_STRTOIMAX=1
+  fi
+
+  if test "$HAVE_STRTOIMAX" = 0 || test "$HAVE_DECL_STRTOIMAX" = 0 ; then
+    bash_cv_func_strtoimax=no REPLACE_STRTOIMAX=1
+  else
+    bash_cv_func_strtoimax=yes
+  fi
+])
+AC_MSG_RESULT($bash_cv_func_strtoimax)
+if test $bash_cv_func_strtoimax = yes; then
+AC_LIBOBJ(strtoimax)
+fi
+])