This is a simple patch that ensures that a .size directive is emitted
when space is allocated for a static variable in the BSS on bare-metal
ARM targets. This allows other tools such as GDB to look up the size of
the object correctly.
Before:
$ readelf -s pr26702.o
Symbol table '.symtab' contains 10 entries:
Num: Value Size Type Bind Vis Ndx Name
...
6: 00000000 0 NOTYPE LOCAL DEFAULT 3 static_foo
...
After:
$ readelf -s pr26702.o
Symbol table '.symtab' contains 10 entries:
Num: Value Size Type Bind Vis Ndx Name
...
6: 00000000 4 NOTYPE LOCAL DEFAULT 3 static_foo
...
The testsuite has been run with a i686-pc-linux-gnu hosted
cross-compiler targetted at arm-none-eabi with no regressions.
Kwok
2015-03-30 Kwok Cheung Yeung <k...@codesourcery.com>
gcc/
PR target/26702
* config/arm/unknown-elf.h (ASM_OUTPUT_ALIGNED_DECL_LOCAL): Emit
size of local.
gcc/testsuite/
PR target/26702
* gcc.target/arm/pr26702.c: New test.
Index: gcc/testsuite/gcc.target/arm/pr26702.c
===================================================================
--- gcc/testsuite/gcc.target/arm/pr26702.c (revision 0)
+++ gcc/testsuite/gcc.target/arm/pr26702.c (revision 0)
@@ -0,0 +1,4 @@
+/* { dg-do compile { target arm*-*-eabi* } } */
+/* { dg-final { scan-assembler "\\.size\[\\t \]+static_foo, 4" } } */
+int foo;
+static int static_foo;
Index: gcc/config/arm/unknown-elf.h
===================================================================
--- gcc/config/arm/unknown-elf.h (revision 447549)
+++ gcc/config/arm/unknown-elf.h (working copy)
@@ -81,6 +81,8 @@
ASM_OUTPUT_ALIGN (FILE, floor_log2 (ALIGN / BITS_PER_UNIT)); \
ASM_OUTPUT_LABEL (FILE, NAME); \
fprintf (FILE, "\t.space\t%d\n", SIZE ? (int)(SIZE) : 1); \
+ fprintf (FILE, "\t.size\t%s, %d\n", \
+ NAME, SIZE ? (int)(SIZE) : 1); \
} \
while (0)
