?RCS: $Id: d_datastart_symbol.U 167 2013-05-08 17:58:00Z rmanfredi $
?RCS:
?RCS: Copyright (c) 2011, Raphael Manfredi
?RCS: 
?RCS: You may redistribute only under the terms of the Artistic License,
?RCS: as specified in the README file that comes with the distribution.
?RCS: You may reuse parts of this distribution only within the terms of
?RCS: that same Artistic License; a copy of which may be found at the root
?RCS: of the source tree for dist 4.0.
?RCS:
?MAKE:d_datastart_symbol d_weak_datastart_symbol: Trylink cat
?MAKE:	-pick add $@ %<
?S:d_datastart_symbol:
?S:	This variable conditionally defines HAS_DATA_START_SYMBOL if the
?S:	linker-defined symbol "__data_start" is available to compute the start
?S:	address of the program's data segment.
?S:.
?S:d_weak_datastart_symbol:
?S:	This variable conditionally defines HAS_WEAK_DATA_START_SYMBOL if the
?S:	linker-defined symbol "data_start" is weakly defined to compute the start
?S:	address of the program's data segment.
?S:.
?C:HAS_DATA_START_SYMBOL:
?C:	This symbol, if defined, indicates that the C program can declare
?C:		extern const int __data_start;
?C:	and then use &__data_start to know the start of the data segment.
?C:.
?C:HAS_WEAK_DATA_START_SYMBOL:
?C:	This symbol, if defined, indicates that the C program can declare
?C:		#pragma weak data_start
?C:		extern const int data_start;
?C:	and then use &data_start to know the start of the data segment.
?C:.
?H:#$d_datastart_symbol HAS_DATA_START_SYMBOL	/**/
?H:#$d_weak_datastart_symbol HAS_WEAK_DATA_START_SYMBOL	/**/
?H:.
?LINT:set d_datastart_symbol d_weak_datastart_symbol
: see if the __data_start symbol exists
$cat >try.c <<EOC
int main(void)
{
	extern int __data_start;
	return (int) &__data_start >> 12;
}
EOC
cyn="whether your linker defines the __data_start symbol"
set d_datastart_symbol
eval $trylink

@if d_weak_datastart_symbol || HAS_WEAK_DATA_START_SYMBOL
: see if the weak data_start symbol exists
$cat >try.c <<EOC
int main(void)
{
#pragma weak data_start
	extern int data_start;
	return (int) &data_start >> 12;
}
EOC
cyn="whether your linker defines the weak data_start symbol"
set d_weak_datastart_symbol
eval $trylink

@end