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authorManoj Srivastava <srivasta@golden-gryphon.com>2014-04-27 18:05:39 -0700
committerManoj Srivastava <srivasta@golden-gryphon.com>2014-04-27 18:05:39 -0700
commit7d4c02d5c9108aa413fbb0ffa1dc8a39bc5f54a1 (patch)
tree2abb9ad01d397bc1e208f57f528c1ec529761392 /mcon/U/d_datastart_symbol.U
parent5c913c35c09a82eead2c07534baa709a5dead3e7 (diff)
parent8f5e5726134ce5b4bd436b16f367796d851df553 (diff)
Merge branch 'upstream'
Signed-off-by: Manoj Srivastava <srivasta@golden-gryphon.com> Conflicts: jmake/jmake.man
Diffstat (limited to 'mcon/U/d_datastart_symbol.U')
-rw-r--r--mcon/U/d_datastart_symbol.U64
1 files changed, 64 insertions, 0 deletions
diff --git a/mcon/U/d_datastart_symbol.U b/mcon/U/d_datastart_symbol.U
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+?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