How to determine the version of the C standard used by the compiler

Question

How do you determine what version of the C   standard is implemented by your compiler  As far as I know  below are the standards I ve known    C  03 C  98

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After a quick google     STDC   and   STDC VERSION    see here

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cplusplus      In C  0x the macro   cplusplus will be set to a value that differs from  is greater than  the current 199711L    C  0x FAQ by BS

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By my knowledge there is no overall way to do this  If you look at the headers of cross platform multiple compiler supporting libraries you ll always find a lot of defines that use compiler specific constructs to determine such things     Define Microsoft Visual C    NET  32-bit  compiler     if  defined  M IX86   amp  amp  defined  MSC VER   amp  amp    MSC VER  gt   1300            endif    Define Borland 5 0 C    16-bit  compiler     if defined   BORLANDC     amp  amp   defined   WIN32              endif   You probably will have to do such defines yourself for all compilers you use

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Depending on what you want to achieve  Boost Config might help you  It does not provide detection of the standard-version  but it provides macros that let you check for support of specific language compiler-features

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Normally you should use   cplusplus define to detect c  17  but by default microsoft compiler does not define that macro properly  see https   devblogs microsoft com cppblog msvc-now-correctly-reports-  cplusplus  - you need to either modify project settings to include  Zc   cplusplus switch  or you could use syntax like this    if   defined  MSVC LANG   amp  amp   MSVC LANG  gt   201703L       cplusplus  gt   201703L         C  17 specific stuff here  endif

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From the Bjarne Stroustrup C  0x FAQ     cplusplus In C  11 the macro   cplusplus will be set to a value that differs from  is greater than  the current 199711L   Although this isn t as helpful as one would like  gcc  apparently for nearly 10 years  had this value set to 1  ruling out one major compiler  until it was fixed when gcc 4 7 0 came out  These are the C   standards and what value you should be able to expect in   cplusplus   C   pre-C  98    cplusplus is 1  C  98    cplusplus is 199711L  C  98   TR1  This reads as C  98 and there is no way to check that I know of  C  11    cplusplus is 201103L  C  14    cplusplus is 201402L  C  17    cplusplus is 201703L   If the compiler might be an older gcc  we need to resort to compiler specific hackery  look at a version macro  compare it to a table with implemented features  or use Boost Config  which provides relevant macros   The advantage of this is that we actually can pick specific features of the new standard  and write a workaround if the feature is missing  This is often preferred over a wholesale solution  as some compilers will claim to implement C  11  but only offer a subset of the features  The Stdcxx Wiki hosts a comprehensive matrix for compiler support of C  0x features  archive org link   if you dare to check for the features yourself   Unfortunately  more finely-grained checking for features  e g  individual library functions like std  copy if  can only be done in the build system of your application  run code with the feature  check if it compiled and produced correct results - autoconf is the tool of choice if taking this route

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Please  run the following code to check the version    include lt iostream gt   int main         if    cplusplus    201703L  std  cout  lt  lt   C  17 n       else if    cplusplus    201402L  std  cout  lt  lt   C  14 n       else if    cplusplus    201103L  std  cout  lt  lt   C  11 n       else if    cplusplus    199711L  std  cout  lt  lt   C  98 n       else std  cout  lt  lt   pre-standard C   n

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Use   cplusplus as suggested  Only one note for Microsoft compiler  use Zc   cplusplus compiler switch to enable   cplusplus  Source https   devblogs microsoft com cppblog msvc-now-correctly-reports-  cplusplus

[c++] How to determine the version of the C++ standard used by the compiler?

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