How to tell if glibc is used

c++ c glibc
x13n picture x13n · Nov 24, 2010 · Viewed 13.6k times · Source

I am trying to implement backtrace functionality for a large framework, which is used for different platforms and OS'es. In some of them, it is linked against glibc, while in the other, something different (eg. uclibc) is used. backtrace() function exists only in the former.

Is there any way to tell whether glibc is used? Any #define? I was unable to find an answer in glibc manual. I know I can't have linking-time information during compilation, but I guess include files have to differ. At least backtrace have to be declared somewhere. I would like to check it without being forced to pass explicit flags to the compiler.

Answer

Erich Kitzmueller picture Erich Kitzmueller · Nov 24, 2010

Include features.h, it contains the macros you need, e.g.

#define __GNU_LIBRARY__ 6

/* Major and minor version number of the GNU C library package.  Use
   these macros to test for features in specific releases.  */
#define __GLIBC__       2
#define __GLIBC_MINOR__ 4

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