/usr/include/openlibm/cdefs-compat.h is in libopenlibm-dev 0.5.0+dfsg-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 | #ifndef _CDEFS_COMPAT_H_
#define _CDEFS_COMPAT_H_
#if defined(__cplusplus)
#define __BEGIN_DECLS extern "C" {
#define __END_DECLS }
#else
#define __BEGIN_DECLS
#define __END_DECLS
#endif
#ifdef __GNUC__
#ifndef __strong_reference
#ifdef __APPLE__
#define __strong_reference(sym,aliassym) __weak_reference(sym,aliassym)
#else
#define __strong_reference(sym,aliassym) \
DLLEXPORT extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)));
#endif /* __APPLE__ */
#endif /* __strong_reference */
#ifndef __weak_reference
#ifdef __ELF__
#ifdef __STDC__
#define __weak_reference(sym,alias) \
__asm__(".weak " #alias); \
__asm__(".equ " #alias ", " #sym)
#define __warn_references(sym,msg) \
__asm__(".section .gnu.warning." #sym); \
__asm__(".asciz \"" msg "\""); \
__asm__(".previous")
#else
#define __weak_reference(sym,alias) \
__asm__(".weak alias"); \
__asm__(".equ alias, sym")
#define __warn_references(sym,msg) \
__asm__(".section .gnu.warning.sym"); \
__asm__(".asciz \"msg\""); \
__asm__(".previous")
#endif /* __STDC__ */
#elif defined(__clang__) /* CLANG */
#ifdef __STDC__
#define __weak_reference(sym,alias) \
__asm__(".weak_reference " #alias); \
__asm__(".set " #alias ", " #sym)
#else
#define __weak_reference(sym,alias) \
__asm__(".weak_reference alias");\
__asm__(".set alias, sym")
#endif
#else /* !__ELF__ */
#ifdef __STDC__
#define __weak_reference(sym,alias) \
__asm__(".stabs \"_" #alias "\",11,0,0,0"); \
__asm__(".stabs \"_" #sym "\",1,0,0,0")
#define __warn_references(sym,msg) \
__asm__(".stabs \"" msg "\",30,0,0,0"); \
__asm__(".stabs \"_" #sym "\",1,0,0,0")
#else
#define __weak_reference(sym,alias) \
__asm__(".stabs \"_/**/alias\",11,0,0,0"); \
__asm__(".stabs \"_/**/sym\",1,0,0,0")
#define __warn_references(sym,msg) \
__asm__(".stabs msg,30,0,0,0"); \
__asm__(".stabs \"_/**/sym\",1,0,0,0")
#endif /* __STDC__ */
#endif /* __ELF__ */
#endif /* __weak_reference */
#endif /* __GNUC__ */
#endif /* _CDEFS_COMPAT_H_ */
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