wok-next view gcc/stuff/patches/003_all_default-fortify-source.patch @ rev 21060

Update: binutils (2.31.1), bison (3.2.2), gcc (8.2.0), glibc (2.28), linux (4.14.85)
author Aleksej Bobylev <al.bobylev@gmail.com>
date Wed Dec 05 02:04:28 2018 +0200 (2018-12-05)
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1 # DP: Turn on -D_FORTIFY_SOURCE=2 by default for C, C++, ObjC, ObjC++,
2 # DP: if the optimization level is > 0
3
4 ---
5 gcc/doc/invoke.texi | 6 ++++++
6 gcc/c-family/c-cppbuiltin.c | 3 +
7 2 files changed, 9 insertions(+), 0 deletions(-)
8
9 Index: b/gcc/doc/invoke.texi
10 ===================================================================
11 --- a/gcc/doc/invoke.texi
12 +++ b/gcc/doc/invoke.texi
13 @@ -7840,6 +7840,12 @@ also turns on the following optimization
14 Please note the warning under @option{-fgcse} about
15 invoking @option{-O2} on programs that use computed gotos.
16
17 +NOTE: In Alpine Linux, @option{-D_FORTIFY_SOURCE=2} is
18 +set by default, and is activated when @option{-O} is set to 2 or higher.
19 +This enables additional compile-time and run-time checks for several libc
20 +functions. To disable, specify either @option{-U_FORTIFY_SOURCE} or
21 +@option{-D_FORTIFY_SOURCE=0}.
22 +
23 @item -O3
24 @opindex O3
25 Optimize yet more. @option{-O3} turns on all optimizations specified
26 Index: b/gcc/c-family/c-cppbuiltin.c
27 ===================================================================
28 --- a/gcc/c-family/c-cppbuiltin.c
29 +++ b/gcc/c-family/c-cppbuiltin.c
30 @@ -1176,6 +1176,10 @@ c_cpp_builtins (cpp_reader *pfile)
31 builtin_define_with_value ("__REGISTER_PREFIX__", REGISTER_PREFIX, 0);
32 builtin_define_with_value ("__USER_LABEL_PREFIX__", user_label_prefix, 0);
33
34 + /* Fortify Source enabled by default for optimization levels > 0 */
35 + if (optimize)
36 + builtin_define_with_int_value ("_FORTIFY_SOURCE", 2);
37 +
38 /* Misc. */
39 if (flag_gnu89_inline)
40 cpp_define (pfile, "__GNUC_GNU_INLINE__");