bug#24703: fontconfig keeps obfuscated reference to itself, not grafted

[ludo@gnu.org (Ludovic Courtès)]

[-- Attachment #1: Type: text/plain, Size: 1150 bytes --]

ludo@gnu.org (Ludovic Courtès) skribis:

> Mark H Weaver <mhw@netris.org> skribis:
>
>> It turns out there's an obfuscated self-reference to fontconfig's store
>> directory.  Here's an excerpt of the output of "hexdump -C
>> libfontconfig.so.1.9.0":
>>
>> 0000cca0  00 48 b9 2f 67 6e 75 2f  73 74 6f c6 40 48 00 45  |.H./gnu/sto.@H.E|
>> 0000ccb0  31 e4 48 89 08 48 b9 72  65 2f 62 34 38 34 6e 48  |1.H..H.re/b484nH|
>> 0000ccc0  89 48 08 48 b9 76 6e 39  6e 6e 72 33 64 48 89 48  |.H.H.vn9nnr3dH.H|
>> 0000ccd0  10 48 b9 64 63 6c 70 7a  32 66 6d 48 89 48 18 48  |.H.dclpz2fmH.H.H|
>> 0000cce0  b9 61 39 79 78 6d 69 6d  67 48 89 48 20 48 b9 32  |.a9yxmimgH.H H.2|
>> 0000ccf0  6a 6a 2d 66 6f 6e 74 48  89 48 28 48 b9 63 6f 6e  |jj-fontH.H(H.con|
>> 0000cd00  66 69 67 2d 32 48 89 48  30 48 b9 2e 31 31 2e 39  |fig-2H.H0H..11.9|
>> 0000cd10  34 2f 65 48 89 48 38 48  b9 74 63 2f 66 6f 6e 74  |4/eH.H8H.tc/font|
>> 0000cd20  73 48 89 48 40 48 8b 04  24 48 8b 18 48 89 c5 48  |sH.H@H..$H..H..H|
>
> See commit 9d50da70608de32d9db0c29859caec6f2cddb95f in WordNet:
> -fno-builtin-strcpy is the solution I found.

Simple test case:


[-- Attachment #2: the code --]
[-- Type: text/plain, Size: 113 bytes --]

#include <string.h>
void foo (char *bar)
{
  strcpy (bar, "this is a very long string that's gonna be split");
}

[-- Attachment #3: Type: text/plain, Size: 74 bytes --]


Run “gcc -c t.c” with and without -fno-builtin-strcpy.

Ludo’.