flex/trunk/flex-pie.patch

   1 This patch fixes a flex-2.6.4 build failure on x86_64 and possibly other
   2 architectures where `size_t' is larger than `int'. The failure occurs as
   3 follows:
   4
   5 A missing `reallocarray' prototype during compilation means that the
   6 compiler assumes an `int' return type. When compiling with `-pie' (standard
   7 for Fedora), addresses on the heap can be larger than `int' can store. Thus,
   8 pointers returned from `reallocarray' are truncated and any read/write to
   9 them leads to a SIGSEGV.
  10
  11 From 24fd0551333e7eded87b64dd36062da3df2f6380 Mon Sep 17 00:00:00 2001
  12 From: Explorer09 <explorer09@gmail.com>
  13 Date: Mon, 4 Sep 2017 10:47:33 +0800
  14 Subject: [PATCH] build: AC_USE_SYSTEM_EXTENSIONS in configure.ac.
  15
  16 This would, e.g. define _GNU_SOURCE in config.h, enabling the
  17 reallocarray() prototype in glibc 2.26+ on Linux systems with that
  18 version of glibc.
  19
  20 Fixes #241.
  21 ---
  22  configure.ac | 2 ++
  23  1 file changed, 2 insertions(+)
  24
  25 Index: b/configure.ac
  26 ===================================================================
  27 --- a/configure.ac
  28 +++ b/configure.ac
  29 @@ -25,8 +25,10 @@
  30  # autoconf requirements and initialization
  31
  32  AC_INIT([the fast lexical analyser generator],[2.6.4],[flex-help@lists.sourceforge.net],[flex])
  33 +AC_PREREQ([2.60])
  34  AC_CONFIG_SRCDIR([src/scan.l])
  35  AC_CONFIG_AUX_DIR([build-aux])
  36 +AC_USE_SYSTEM_EXTENSIONS
  37  LT_INIT
  38  AM_INIT_AUTOMAKE([1.11.3 -Wno-portability foreign check-news std-options dist-lzip parallel-tests subdir-objects])
  39  AC_CONFIG_HEADER([src/config.h])