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[devel] Added appropriate feature test macros (_POSIX_SOURCE, _ISOC99_SOURCE)

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to ensure libpng sees the correct API.
This commit is contained in:
Glenn Randers-Pehrson
2011-05-03 22:30:19 -05:00
parent 1384c048e4
commit b3b7168077
5 changed files with 32 additions and 3 deletions
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15
pngpriv.h
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@@ -25,6 +25,21 @@
#ifndef PNGPRIV_H
#define PNGPRIV_H
/* Feature Test Macros. The following are defined here to ensure that correctly
* implemented libraries reveal the APIs libpng needs to build and hide those
* that are not needed and potentially damaging to the compilation.
*
* Feature Test Macros must be defined before any system header is included (see
* POSIX 1003.1 2.8.2 "POSIX Symbols."
*
* These macros only have an effect if the operating system supports either
* POSIX 1003.1 or C99, or both. On other operating systems (particularly
* Windows/Visual Studio) there is no effect; the OS specific tests below are
* still required (as of 2011-05-02.)
*/
#define _POSIX_SOURCE 1 /* Just the POSIX 1003.1 and C89 APIs */
#define _ISOC99_SOURCE 1 /* for snprintf */
/* This is required for the definition of abort(), used as a last ditch
* error handler when all else fails.
*/