How universally is C99 supported?

Question

How universally is the C99 standard supported in today\'s compilers? I understand that not even GCC fully supports it. Is this right?

Which features of C99 are suppo

Answer 1

Someone mentioned the Intel compiler has C99 support. There is also the Comeau C/C++ compiler which fully supports C99. These are the only ones I'm aware of.

C99 features that I do not use because they are not well supported include:

• variable length arrays
• macros with variable number of parameters.

C99 features that I regularly use that seem to be pretty well supported (except by Microsoft):

• stdint.h
• snprintf() - MS has a non-standard _snprintf() that has serious limitations of not always null terminating the buffer and not indicating how big the buffer should be

To work around Microsoft's non-support, I use a public domain stdint.h from MinGW (that I modified to also work on VC6) and a nearly public domain snprintf() from Holger Weiss

Items that are not supported by Microsoft, but will still use on other compilers depending on the project include:

• mixed declarations and code
• inline functions
• _Pragma() - this makes pragmas much more usable