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https://gcc.gnu.org/c99status.html
55 rows · C99 is substantially completely supported as of GCC 4.5 (with -std=c99 -pedantic-errors used; -fextended-identifiers also needed to enable extended identifiers before GCC 5), modulo bugs and floating-point issues (mainly but not entirely relating to optional C99 features from Annexes F and G). The following table gives more details of the C99 support in different GCC versions.
https://stackoverflow.com/questions/22285043/forcing-compiler-to-c99-standard
clang in general attempts to support most of the extensions that gcc does. Both will even allow you to use features that are C only in C++ for example VLAs which are a C99 feature. With -pedantic flag you should see a warning like this in gcc : and it turn into an error with -pedantic-errors.
https://github.com/commercialhaskell/stack/issues/4186
Jul 29, 2018 · The compiler, while called gcc, is in fact Apple's clang — it just offers a gcc binary since many programs expect that. I expect this is likely an issue with the compiler installation, since it seems that (a) clang does support C99, and it seems that -std=c99 should enable it (b) clang is the default compiler on Mac (c) GHC supports Macs. There might be some upstream integration bug.
https://code-examples.net/en/q/1cf98a
Short answer: The "easier" a C99 feature is to implement without changing compiler grammars or replumbing the standard library, the more likely VC++ is to support it. If there's a conflict between C99 and C++, expect C++ to win.
https://gcc.gnu.org/onlinedocs/gcc/Standards.html
2 Language Standards Supported by GCC. ... Some features that are part of the C99 standard are accepted as extensions in C90 mode, and some features that are part of the C11 standard are accepted as extensions in C90 and C99 modes. ... Most of the compiler support routines used by GCC are present in libgcc, but there are a few exceptions.
http://mingw.org/wiki/C99
GCC does not include a C runtime library. This is supplied by the platform. The MinGW port of GCC uses Microsoft's original (old) Visual C runtime, MSVCRT, which was targeted by Microsoft Visual Studio 6 (released in 1998). C99 is a standard which did not exist when MSVCRT was created.
https://bytes.com/topic/c/answers/435098-support-c99-vla-compilers
Dec 15, 2005 · I read that GCC had experimental VLA support since before C99 and that it still isn't exactly the same as the C99 VLA. Comeau C/C++ has full C99 support, including VLAs.
https://en.wikipedia.org/wiki/C99
A major feature of C99 is its numerics support, and in particular its support for access to the features of IEEE 754-1985 (also known as IEC 60559) floating-point hardware present in the vast majority of modern processors (defined in "Annex F IEC 60559 floating-point arithmetic").
https://cboard.cprogramming.com/c-programming/153891-best-compiler-s-c11-c99.html
Jan 24, 2013 · Okay, thanks. The reason I asked is because the last time I checked, the default runtime used by gcc on Windows didn't support C99/C11. So even though the compiler supported most of the C99 standard there were problems caused by the runtime library which doesn't support anything but …
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