diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/libc-symbols.h | 44 |
1 files changed, 34 insertions, 10 deletions
diff --git a/include/libc-symbols.h b/include/libc-symbols.h index c5ec2814f..391d53f1b 100644 --- a/include/libc-symbols.h +++ b/include/libc-symbols.h @@ -1,4 +1,7 @@ -/* Copyright (C) 1991,92,93,95,96,97,98,99,2000,2001 Free Software Foundation, Inc. +/* Support macros for making weak and strong aliases for symbols, + and for using symbol sets and linker warnings with GNU ld. + Copyright (C) 1995-1998,2000-2003,2004,2005,2006 + Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -17,14 +20,38 @@ 02111-1307 USA. */ #ifndef _LIBC_SYMBOLS_H -#define _LIBC_SYMBOLS_H 1 +#define _LIBC_SYMBOLS_H 1 + +/* This file's macros are included implicitly in the compilation of every + file in the C library by -imacros. + + We include uClibc_arch_features.h which is defined by arch devs. + It should define for us the following symbols: + + * HAVE_ASM_SET_DIRECTIVE if we have `.set B, A' instead of `A = B'. + * ASM_GLOBAL_DIRECTIVE with `.globl' or `.global'. + * ASM_TYPE_DIRECTIVE_PREFIX with `@' or `#' or whatever for .type, + or leave it undefined if there is no .type directive. + * HAVE_ELF if using ELF, which supports weak symbols using `.weak'. + * HAVE_ASM_WEAK_DIRECTIVE if we have weak symbols using `.weak'. + * HAVE_ASM_WEAKEXT_DIRECTIVE if we have weak symbols using `.weakext'. + + */ #include <bits/uClibc_arch_features.h> -#define _LIBC 1 + +/* This is defined for the compilation of all C library code. features.h + tests this to avoid inclusion of stubs.h while compiling the library, + before stubs.h has been generated. Some library code that is shared + with other packages also tests this symbol to see if it is being + compiled as part of the C library. We must define this before including + config.h, because it makes some definitions conditional on whether libc + itself is being compiled, or just some generator program. */ +#define _LIBC 1 /* Enable declarations of GNU extensions, since we are compiling them. */ -#define _GNU_SOURCE 1 +#define _GNU_SOURCE 1 /* Prepare for the case that `__builtin_expect' is not available. */ #if __GNUC__ == 2 && __GNUC_MINOR__ < 96 @@ -128,13 +155,13 @@ # define _strong_alias(name, aliasname) \ extern __typeof (name) aliasname __attribute__ ((alias (#name))); -# ifdef HAVE_WEAK_SYMBOLS - /* This comes between the return type and function name in a function definition to make that definition weak. */ # define weak_function __attribute__ ((weak)) # define weak_const_function __attribute__ ((weak, __const__)) +# ifdef HAVE_WEAK_SYMBOLS + /* Define ALIASNAME as a weak alias for NAME. If weak aliases are not available, this defines a strong alias. */ # define weak_alias(name, aliasname) _weak_alias (name, aliasname) @@ -147,9 +174,6 @@ # else -# define weak_function /* empty */ -# define weak_const_function /* empty */ - # define weak_alias(name, aliasname) strong_alias(name, aliasname) # define weak_extern(symbol) /* Nothing. */ @@ -235,7 +259,7 @@ functions not exported) a bit faster by using a different calling convention. */ #ifndef internal_function -# define internal_function /* empty */ +# define internal_function /* empty */ #endif /* We want the .gnu.warning.SYMBOL section to be unallocated. */ |