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[build] Remove unused IMPORT_SYMBOL() and EXPORT_SYMBOL() macros

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Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2015-03-03 15:51:33 +00:00
parent b2f38da888
commit 30d356b455
1 changed files with 0 additions and 48 deletions
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48
src/include/compiler.h
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@@ -97,9 +97,6 @@
* necessary to satisfy the reference. However, the undefined symbol * necessary to satisfy the reference. However, the undefined symbol
* is not referenced in any relocations, so the link can still succeed * is not referenced in any relocations, so the link can still succeed
* if no file contains it. * if no file contains it.
*
* A symbol passed to this macro may not be referenced anywhere
* else in the file. If you want to do that, see IMPORT_SYMBOL().
*/ */
#ifdef ASSEMBLY #ifdef ASSEMBLY
#define REQUEST_SYMBOL( _sym ) \ #define REQUEST_SYMBOL( _sym ) \
@@ -109,51 +106,6 @@
__asm__ ( ".equ\t__need_" #_sym ", " #_sym ) __asm__ ( ".equ\t__need_" #_sym ", " #_sym )
#endif /* ASSEMBLY */ #endif /* ASSEMBLY */
/** Set up a symbol to be usable in another file by IMPORT_SYMBOL()
*
* The symbol must already be marked as global.
*/
#define EXPORT_SYMBOL( _sym ) PROVIDE_SYMBOL ( __export_ ## _sym )
/** Make a symbol usable to this file if available at link time
*
* If no file passed to the linker contains the symbol, it will have
* @c NULL value to future uses. Keep in mind that the symbol value is
* really the @e address of a variable or function; see the code
* snippet below.
*
* In C using IMPORT_SYMBOL, you must specify the declaration as the
* second argument, for instance
*
* @code
* IMPORT_SYMBOL ( my_func, int my_func ( int arg ) );
* IMPORT_SYMBOL ( my_var, int my_var );
*
* void use_imports ( void ) {
* if ( my_func && &my_var )
* my_var = my_func ( my_var );
* }
* @endcode
*
* GCC considers a weak declaration to override a strong one no matter
* which comes first, so it is safe to include a header file declaring
* the imported symbol normally, but providing the declaration to
* IMPORT_SYMBOL is still required.
*
* If no EXPORT_SYMBOL declaration exists for the imported symbol in
* another file, the behavior will be most likely be identical to that
* for an unavailable symbol.
*/
#ifdef ASSEMBLY
#define IMPORT_SYMBOL( _sym ) \
REQUEST_SYMBOL ( __export_ ## _sym ) ; \
.weak _sym
#else /* ASSEMBLY */
#define IMPORT_SYMBOL( _sym, _decl ) \
REQUEST_SYMBOL ( __export_ ## _sym ) ; \
extern _decl __attribute__ (( weak ))
#endif
/** @} */ /** @} */
/** /**