extras/tools/bison-macOS-7df04f9.patch

   1 From 7df04f9b8a0adb1575ca0555775ec10860143cbf Mon Sep 17 00:00:00 2001
   2 From: Bruno Haible <bruno@clisp.org>
   3 Date: Fri, 7 Jul 2017 23:35:32 +0200
   4 Subject: vasnprintf: port to macOS 10.13
   5
   6 Improve comments in last commit.
   7 ---
   8  lib/vasnprintf.c | 17 ++++++++++-------
   9  2 files changed, 11 insertions(+), 7 deletions(-)
  10
  11 diff --git a/lib/vasnprintf.c b/lib/vasnprintf.c
  12 index fecaf27..2e4eb19 100644
  13 --- a/lib/vasnprintf.c
  14 +++ b/lib/vasnprintf.c
  15 @@ -4869,10 +4869,9 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *lengthp,
  16  #endif
  17                    *fbp = dp->conversion;
  18  #if USE_SNPRINTF
  19 -# if ! (((__GLIBC__ > 2                                                 \
  20 -          || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 3))                  \
  21 -         && !defined __UCLIBC__)                                        \
  22 -        || (defined __APPLE__ && defined __MACH__)                      \
  23 +# if ! (((__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 3))        \
  24 +         && !defined __UCLIBC__)                                            \
  25 +        || (defined __APPLE__ && defined __MACH__)                          \
  26          || ((defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__))
  27                  fbp[1] = '%';
  28                  fbp[2] = 'n';
  29 @@ -4887,9 +4886,13 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *lengthp,
  30                     in format strings in writable memory may crash the program
  31                     (if compiled with _FORTIFY_SOURCE=2), so we should avoid it
  32                     in this situation.  */
  33 -                /* macOS 10.13 High Sierra behaves like glibc with
  34 -                   _FORTIFY_SOURCE=2, and older macOS releases
  35 -                   presumably do not need %n.  */
  36 +                /* On Mac OS X 10.3 or newer, we know that snprintf's return
  37 +                   value conforms to ISO C 99: the tests gl_SNPRINTF_RETVAL_C99
  38 +                   and gl_SNPRINTF_TRUNCATION_C99 pass.
  39 +                   Therefore we can avoid using %n in this situation.
  40 +                   On Mac OS X 10.13 or newer, the use of %n in format strings
  41 +                   in writable memory by default crashes the program, so we
  42 +                   should avoid it in this situation.  */
  43                  /* On native Windows systems (such as mingw), we can avoid using
  44                     %n because:
  45                       - Although the gl_SNPRINTF_TRUNCATION_C99 test fails,
  46 --
  47 cgit v1.0-41-gc330
  48