Libraries

Standard C Libraries

Bionic libc

Type	Macro
Idenfication	__BIONIC__

GNU glibc

The following macros have to be included from the `` header file.

Type	Macro	Description
Version	__GNU_LIBRARY__``__GNU_LIBRARY_MINOR__	Until version 5
Version	__GLIBC__``__GLIBC_MINOR__	From version 6

Please notice that the header file does not exist on all platforms, so it cannot be included without further ado. However, since it is included by other GNU glibc header files, a better way to obtain the above-mentioned macros is to include the header file (see e.g. paragraph 4/6 in ISO/IEC 9899:1999).

klibc

Type	Macro	Format	Description
Identification	__KLIBC__		Zero is a valid value
Version	__KLIBC__		Version
Version	__KLIBC_MINOR__		Revision
Version	__KLIBC_PATCHLEVEL__		Patch
Version	__KLIBC_VERSION__	0xVVRRPPPP	VV = VersionRR = RevisionPPPP = Patch

uClibc

The following macros have to be included from the `` header file.

Type	Macro	Description
Identification	__UCLIBC__
Version	__UCLIBC_MAJOR__	Version
Version	__UCLIBC_MINOR__	Revision
Version	__UCLIBC_SUBLEVEL__	Patch

VMS libc

Type	Macro	Format	Description
Identification	__CRTL_VER
Version	__CRTL_VER	VVRREPPTT	VV = VersionRR = RevisionE = Edit numberPP = Patch (01 = A, ... 26 = Z)TT = Type (22 = official)

Please notice that I am not sure about the format of __CRTL_VER, but it seems to follow that of __VMS_VER.

z/OS libc

Type	Macro	Format	Description
Identification	__LIBREL__		Host
Identification	__TARGET_LIB__		Target
Version	__LIBREL__	0xNVRRPPPP	N = Product (0 = C/370, 1 = MVS, 2 = OS/390, 4 = z/OS)V = VersionRR = RevisionPPPP = PatchDefined for z/OS XL C/C++
Version	__TARGET_LIB__	As above

Example

Library	__LIBREL__
OS/390 2.10	0x220A0000
z/OS 1.1	0x41010000
z/OS 1.6	0x41060000