platform-defines.txt

__linux__       Defined on Linux
__sun           Defined on Solaris
__FreeBSD__     Defined on FreeBSD
__NetBSD__      Defined on NetBSD
__OpenBSD__     Defined on OpenBSD
__APPLE__       Defined on Mac OS X
__hpux          Defined on HP-UX
__osf__         Defined on Tru64 UNIX (formerly DEC OSF1)
__sgi           Defined on Irix
_AIX            Defined on AIX
_WIN32          Defined on Windows
_WIN64          Defined on Windows 64 bit (implies _WIN32)
__ANDROID__     Defined on Android (implies __linux__)
__ros__         Defined on Akaros
__Fuchsia__     Defined on Fuschia

_MSC_VER        Visual Studio
__GNUC__        gcc
__clang__       clang
__MINGW32__     Mingw-w64 32 bit
__MINGW64__     Mingw-w64 64 bit

C89       __STDC__                      ANSI X3.159-1989
C90       __STDC__                      ISO/IEC 9899:1990
C94       __STDC_VERSION__ = 199409L    ISO/IEC 9899-1:1994
C99       __STDC_VERSION__ = 199901L    ISO/IEC 9899:1999
C11       __STDC_VERSION__ = 201112L    ISO/IEC 9899:2011
C18       __STDC_VERSION__ = 201710L    ISO/IEC 9899:2018
C++98     __cplusplus = 199711L         ISO/IEC 14882:1998
C++11     __cplusplus = 201103L         ISO/IEC 14882:2011
C++14     __cplusplus = 201402L         ISO/IEC 14882:2014
C++17     __cplusplus = 201703L         ISO/IEC 14882:2017
C++/CLI   __cplusplus_cli = 200406L     ECMA-372

https://sourceforge.net/p/predef/wiki/Standards/

__cplusplus
C++ pre-C++98:  __cplusplus = 1
C++98:          __cplusplus = 199711L
C++11:          __cplusplus = 201103L
C++14:          __cplusplus = 201402L
C++17:          __cplusplus = 201703L

https://stackoverflow.com/questions/2324658/how-to-determine-the-version-of-the-c-standard-used-by-the-compiler

VS                        _MSC_VER   _MSC_FULL_VER
1                         800
3                         900
4                         1000
4                         1020
5                         1100
6                         1200
6 SP6                     1200    12008804
7                         1300    13009466
7.1 (2003)                1310    13103077
8 (2005)                  1400    140050727
9 (2008)                  1500    150021022
9 SP1                     1500    150030729
10 (2010)                 1600    160030319
10 (2010) SP1             1600    160040219
11 (2012)                 1700    170050727
12 (2013)                 1800    180021005
14 (2015)                 1900    190023026
14 (2015 Update 1)        1900    190023506
14 (2015 Update 2)        1900    190023918
14 (2015 Update 3)        1900    190024210
15 (2017 Update 1 & 2)    1910    191025017
15 (2017 Update 3 & 4)    1911
15 (2017 Update 5)        1912

__i386__
__x86_64__
__powerpc64__
__arm__
__aarch64__

https://sourceforge.net/p/predef/wiki/Compilers/