Re: more m4 underquotations

[Bruno Haible]

Hello Ralf,

Three bugs found by simple inspection! Wow!

> 2007-02-13  Ralf Wildenhues  <address@hidden>
> 
>       * m4/intdiv0.m4 (gt_INTDIV0): Fix m4 quoting bug.

Thanks; I'm applying an equivalent patch.

> If you prefer some other quoting style (e.g., maximal quoting or
> quadrigraphs, but rather not changequote)

There is an important property that programming languages should have:
the ability to copy and paste a piece of code from one place to another.

  - Why was PASCAL's compound statement
       BEGIN stmt1 ; stmt2 ; ... ; stmtN END
    so weird? Because when copying or removing the last statement of a
    compound statement, you had to add or remove a semicolon, nearly always.

  - Why is it so heavy to move a C++ method declaration from inside a
    class to outside? Because the syntax is different:
       inside:         int foo (arg1...) { ... }
       outside:        [inline] int bar::foo (arg1...) { ... }

  - Why was LaTeX so unreliable in the first years? Because when you had a
    string like {\"{U}berschrift} and it was copied to a page header or an
    index, you suddenly needed to add \protect here and there, such as
    {\protect\"{U}berschrift}.

changequote does have this property to a large extent: You can move a piece
of code that uses changequote between an "unquoted" context and a
"single-quoted" context without modifications, and you can also copy/paste
to a shell if you remove the (easily visible) changequote lines and comment
lines.

Quadrigraphs don't have this property as much: You can move a piece of code
between an "unquoted" context, a "single-quoted" context or a "doubly-quoted"
context without modifications. But no easy copy/paste to a shell.

[[...]] doesn't have this property at all.

Bruno





2007-02-13  Bruno Haible  <address@hidden>

        * m4/intdiv0.m4 (gt_INTDIV0): Assume ANSI C. Fix underquoting bug.
        Reported by Ralf Wildenhues <address@hidden>.

*** m4/intdiv0.m4       24 Feb 2005 20:12:45 -0000      1.4
--- m4/intdiv0.m4       13 Feb 2007 22:42:35 -0000
***************
*** 1,5 ****
! # intdiv0.m4 serial 1 (gettext-0.11.3)
! dnl Copyright (C) 2002 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.
--- 1,5 ----
! # intdiv0.m4 serial 2 (gettext-0.16.2)
! dnl Copyright (C) 2002, 2007 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.
***************
*** 19,29 ****
  #include <signal.h>
  
  static void
- #ifdef __cplusplus
  sigfpe_handler (int sig)
- #else
- sigfpe_handler (sig) int sig;
- #endif
  {
    /* Exit with code 0 if SIGFPE, with code 1 if any other signal.  */
    exit (sig != SIGFPE);
--- 19,25 ----
***************
*** 53,64 ****
--- 49,62 ----
  ], gt_cv_int_divbyzero_sigfpe=yes, gt_cv_int_divbyzero_sigfpe=no,
          [
            # Guess based on the CPU.
+ changequote(,)dnl
            case "$host_cpu" in
              alpha* | i[34567]86 | m68k | s390*)
                gt_cv_int_divbyzero_sigfpe="guessing yes";;
              *)
                gt_cv_int_divbyzero_sigfpe="guessing no";;
            esac
+ changequote([,])dnl
          ])
      ])
    case "$gt_cv_int_divbyzero_sigfpe" in