diff options
| -rw-r--r-- | src/gui/image/qpnghandler.cpp | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/src/gui/image/qpnghandler.cpp b/src/gui/image/qpnghandler.cpp index f7d07a5b14..1714442eb6 100644 --- a/src/gui/image/qpnghandler.cpp +++ b/src/gui/image/qpnghandler.cpp @@ -58,6 +58,29 @@ #include <pngconf.h> #endif +#if PNG_LIBPNG_VER >= 10400 && PNG_LIBPNG_VER <= 10502 \ + && defined(PNG_PEDANTIC_WARNINGS_SUPPORTED) +/* + Versions 1.4.0 to 1.5.2 of libpng declare png_longjmp_ptr to + have a noreturn attribute if PNG_PEDANTIC_WARNINGS_SUPPORTED + is enabled, but most declarations of longjmp in the wild do + not add this attribute. This causes problems when the png_jmpbuf + macro expands to calling png_set_longjmp_fn with a mismatched + longjmp, as compilers such as Clang will treat this as an error. + + To work around this we override the png_jmpbuf macro to cast + longjmp to a png_longjmp_ptr. +*/ +# undef png_jmpbuf +# ifdef PNG_SETJMP_SUPPORTED +# define png_jmpbuf(png_ptr) \ + (*png_set_longjmp_fn((png_ptr), (png_longjmp_ptr)longjmp, sizeof(jmp_buf))) +# else +# define png_jmpbuf(png_ptr) \ + (LIBPNG_WAS_COMPILED_WITH__PNG_NO_SETJMP) +# endif +#endif + #ifdef Q_OS_WINCE #define CALLBACK_CALL_TYPE __cdecl #else |