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gccg++64-bitlong-integer
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Reputation: 721

gcc, width of long int on different architectures

On 64-bit architectures, long int, according to gcc is at least an int64_t. On 32-bit, long int is at least int32_t. With Microsoft compilers, long is always an int32_t, regardless of 32/64-bit. Is there any way to:

  1. Force gcc to treat long as a int64_t, on 32bit? (for ease of testing)
  2. Force gcc to treat long as a int32_t on 64bit? (for compliance with MS's compiler).

Upvotes: 6

Views: 23966

Answers (2)

Paul R
Paul R

Reputation: 213160

Don't do this - use standard types such as int32_t, uint32_t, int64_t, uint64_t, etc from <stdint.h> rather than trying to make assumptions about naked types such as long int or trying to bend the compiler to your will.

Note: The 64-bit model for any given platform (e.g. LP64 for most *nix platforms, Mac OS X, etc) is a given, so even if you could convince the compiler to use a different 64-bit model you would probably break any calls to system code, libraries, etc.

Upvotes: 19

Goz
Goz

Reputation: 62333

This is why its generally much easier to use a set of typedefs that are defined per platform. It will really save you a lot of hassle when compiling on random-platform-with-random-compiler-47.4

Upvotes: 0

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