There is no 64-bit type in C89
source link: https://sporks.space/2021/07/02/there-is-no-64-bit-type-in-c89/
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Brief post, but I was porting a C89 project to Visual C++ 6 (don’t ask) when I found something really fun. Turns out “long long“, the type everyone assumes is the 64-bit type in C, is actually a GCC extension. MSVC uses… _int64, a different extension. Great, had to convert a bunch of code. You’ll get this fun error from old MSVC when it sees it:
error C2632: 'long' followed by 'long' is illegal(Note that MSVC will probably assume your C code is C++, which does mean you get some stuff from C99 for free like single-line comments… but then initializers are different between C and C++, and C++ only added long long in C++11…)
It’s an unfortunate gotcha for those who assume they’re writing standards compliant C89. The reason might be deflated when you have to define your own 64-bit integer with #ifdef. Oh, and let’s not forgot “long long” could mean 72-bit on your 9-bit byte system, of course. That’s why stdint.h exists…. except, oh, C89.
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