On Mon, Oct 23, 2017 at 11:13:13PM -0400, Programmingkid wrote: > > > On Oct 23, 2017, at 12:09 PM, Stefan Hajnoczi <stefanha@xxxxxxxxx> wrote: > > > > On Sun, Oct 22, 2017 at 10:50:16PM -0400, John Arbuckle wrote: > >> Prior the Mac OS 10.7, the function strnlen() was not available. This patch > >> implements strnlen() on Mac OS X versions that are below 10.7. > >> > >> Signed-off-by: John Arbuckle <programmingkidx@xxxxxxxxx> > >> --- > >> v3 changes: > >> - Replaced loop with memchr() > >> > >> v2 changes: > >> - Simplified the code to make it static inline'ed > >> - Changed the type of count to size_t > >> > >> libfdt/libfdt_env.h | 24 ++++++++++++++++++++++++ > >> 1 file changed, 24 insertions(+) > >> > >> diff --git a/libfdt/libfdt_env.h b/libfdt/libfdt_env.h > >> index 952056c..d43b66b 100644 > >> --- a/libfdt/libfdt_env.h > >> +++ b/libfdt/libfdt_env.h > >> @@ -109,4 +109,28 @@ static inline fdt64_t cpu_to_fdt64(uint64_t x) > >> #undef CPU_TO_FDT16 > >> #undef EXTRACT_BYTE > >> > >> +#ifdef __APPLE__ > >> +#include <AvailabilityMacros.h> > >> + > >> +#define MAC_OS_X_VERSION_10_7 1070 > > > > Apple has already defined MAC_OS_X_VERSION_10_7 here: > > https://opensource.apple.com/source/xnu/xnu-1699.24.8/EXTERNAL_HEADERS/AvailabilityMacros.h > > > > To avoid a compiler warning, please use: > > > > #ifndef MAC_OS_X_VERSION_10_7 > > #define MAC_OS_X_VERSION_10_7 1070 > > #endif > > Sounds logical. > > > > >> +/* strnlen() is not available on Mac OS < 10.7 */ > >> +# if (MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_7) > > > > Does this cover the case where MAC_OS_X_VERSION_MAX_ALLOWED is set to > > <1070 on a 10.7+ build machine? It's possible that the <string.h> > > header would define strnlen() and your code redefines the function > > (compiler error). > > If MAC_OS_X_VERSION_MAX_ALLOWED is equal to 1070 then this code would not be executed. This branch would only be taken if MAC_OS_X_VERSION_MAX_ALLOWED is less than 1070. So there would not be a compiler error. > > > > > It would be best to check how <string.h>, <Availability.h>, and > > <AvailabilityMacros.h> work to make sure that all cases are handled. I > > don't have access to a Mac right now, sorry. > > > > Perhaps this approach works better: > > > > # ifndef MAC_OS_X_VERSION_10_7 > > I think you are saying I should remove the "#ifdef __APPLE__" code and just check to see if MAC_OS_X_VERSION_10_7 is defined. That might work on Mac OS 10.6 and 10.5, but it would probably cause problems with non-Mac-OS platforms. No, the ifndef is still "indented" and it would be like this: #ifdef __APPLE_ ... # ifndef MAC_OS_X_VERSION_10_7 -- To unsubscribe from this list: send the line "unsubscribe devicetree-compiler" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
