When compiling with a specific vendor's implementation of the C language, and related libraries, be aware that, unfortunately, standards conformance can differ from vendor to vendor. Be certain to read your vendor's documentation to reduce the likelihood of accidentally relying on implementation-specific behavior or deviations.
Implementation-Specific Deviations
Implementation-specific deviations are listed below. The Version column lists the latest version of the compiler or library that exhibits the behavior.
Microsoft Visual Studio
| API | Description | Version | Link |
|---|---|---|---|
| Format specifier type field | c, s, and z are not ANSI compatible; F unsupported | 2012 | MSDN |
| Format specifier size field | I, I32 and I64 are MSVC-specific; h, w and l are not ANSI compatible; hh, j, z and t unsupported | 2012 | MSDN |
| <complex.h> | Absent; __STDC_NO_COMPLEX__ is defined | 2012 | |
isblank() | Absent | 2012 | |
| <fenv.h> | Absent | 2012 | |
| <inttypes.h> | Absent | 2012 | |
| Absent | 2012 | |
#pragma FP_CONTRACT | Spelled fp_contract instead of FP_CONTRACT | 2012 | MSDN |
fpclassify() | Absent, use _fpclass() instead | 2012 | MSDN |
isfinite(), isinf() | Absent, use _finite() or _finitef()instead | 2012 | MSDN |
isnan() | Absent, use _isnan() or _isnanf() instead | 2012 | MSDN |
isnormal() | Absent, use _fpclass() instead | 2012 | MSDN |
signbit() | Absent | 2012 | |
acosh(), asinh(), atanh() | Absent | 2012 | |
exp2(), expm1(), ilogb(), log1p(),log2() | Absent | 2012 | |
scalbn() | Absent; use _scalb() (or _scalbf() on x64 targets only) instead | 2012 | MSDN |
cbrt() | Absent | 2012 | |
erf(), erfc(), lgamma(), tgamma() | Absent | 2012 | |
nearbyint(), rint(), lrint(),round(), lround(), trunk() | Absent | 2012 | |
remainder(), remquo() | Absent | 2012 | |
copysign() | Absent; use _copysign() instead | 2012 | MSDN |
nan(), nexttoward() | Absent | 2012 | |
nextafter() | Absent; use _nextafter() or _nextafterf() instead | 2012 | MSDN |
fdim(), fmax(), fmin() | Absent | 2012 | |
fma() | Absent | 2012 | |
isgreater(), isgreaterequal(),isless(), islessequal(), isunordered() | Absent | 2012 | |
<stdalign.h> | Absent |