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Diffstat (limited to 'mcon/U/d_datastart_symbol.U')
| -rw-r--r-- | mcon/U/d_datastart_symbol.U | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/mcon/U/d_datastart_symbol.U b/mcon/U/d_datastart_symbol.U new file mode 100644 index 0000000..252d3ea --- /dev/null +++ b/mcon/U/d_datastart_symbol.U @@ -0,0 +1,64 @@ +?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 |