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Tip of the Day
Language: C++
Expertise: Intermediate
Jan 29, 2008

Determine Whether a C or C++ Compiler Was Used to Compile Code

The code below contains standard, pre-defined macros used at runtime to determine whether a C or C++ compiler was used to compile the code. For C compilers, it also determines the version of the C language standard that the compiler implements).

NOTE: Some people prefer to use STDC_HEADERS rather than __STDC__..


#ifdef __cplusplus
 printf("C++ compiler\n");
#else
#ifdef __STDC__
#if (defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)) ||/*continue..
    ...on the next line */ (defined(__GNUC__) && !defined(__STRICT_ANSI__))
 printf("ANSI X3.159-1999 / ISO 9899:1999 (C99) compiler\n");
#else
 printf("ANSI X3.159-1989 (C89) / ISO/IEC 9899:1990 (C90) C compiler\n");
#endif
#else
 printf("Pre-ANSI (K&R) C compiler\n");
#endif
#endif
The code below determines whether a C or C++ compiler was used to compile the code at runtime:

if (sizeof('c') != sizeof(int)) printf("C++ compiler\n");
else if ((unsigned char)1 < -1)	printf("Pre-ANSI (K&R) C compiler\n");
else { int i;	i = 1 //* */
 +1;
if (i == 2) printf("ANSI X3.159-1999 / ISO 9899:1999 (C99) compiler\n");
else printf("ANSI X3.159-1989 (C89) / ISO/IEC 9899:1990 (C90) C compiler\n");}

Alexander Ocher
 
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