mirror of
https://github.com/Keychron/qmk_firmware.git
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59 lines
1.6 KiB
C
59 lines
1.6 KiB
C
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/*
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* have_ulong64 - Determine if we have a 64 bit unsigned long long
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*
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* usage:
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* have_ulong64 > longlong.h
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*
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* Not all systems have a 'long long type' so this may not compile on
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* your system.
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*
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* This prog outputs the define:
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*
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* HAVE_64BIT_LONG_LONG
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* defined ==> we have a 64 bit unsigned long long
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* undefined ==> we must simulate a 64 bit unsigned long long
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*/
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/*
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*
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* Please do not copyright this code. This code is in the public domain.
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*
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* LANDON CURT NOLL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO
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* EVENT SHALL LANDON CURT NOLL BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
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* USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*
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* By:
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* chongo <Landon Curt Noll> /\oo/\
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* http://www.isthe.com/chongo/
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*
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* Share and Enjoy! :-)
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*/
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/*
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* have the compiler try its hand with unsigned and signed long longs
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*/
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#if ! defined(NO64BIT_LONG_LONG)
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unsigned long long val = 1099511628211ULL;
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#endif /* NO64BIT_LONG_LONG */
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int
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main(void)
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{
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/*
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* ensure that the length of long long val is what we expect
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*/
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#if defined(NO64BIT_LONG_LONG)
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printf("#undef HAVE_64BIT_LONG_LONG\t/* no */\n");
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#else /* NO64BIT_LONG_LONG */
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if (val == 1099511628211ULL && sizeof(val) == 8) {
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printf("#define HAVE_64BIT_LONG_LONG\t/* yes */\n");
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}
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#endif /* NO64BIT_LONG_LONG */
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/* exit(0); */
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return 0;
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}
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