I'm working with a program that works fine with CCS and consumes about 45K
of rom and 8K of ram. Linking it with mspgcc produces errors:
/usr/local/msp430/lib/gcc/msp430/4.7.0/../../../../msp430/bin/ld:
build/test.elf section `.rodata' will not fit in region `rom'
/usr/local/msp430/lib/gcc/msp430/4.7.0/../../../../msp430/bin/ld: section
.vectors loaded at [000000000000ff80,000000000000ffff] overlaps section
.rodata loaded at [000000000000e860,000000000000ff80]
/usr/local/msp430/lib/gcc/msp430/4.7.0/../../../../msp430/bin/ld: section
.data loaded at [000000000000ff82,000000000001024c] overlaps section
.vectors loaded at [000000000000ff80,000000000000ffff]
/usr/local/msp430/lib/gcc/msp430/4.7.0/../../../../msp430/bin/ld: section
.far.text loaded at [0000000000010000,0000000000010287] overlaps section
.data loaded at [000000000000ff82,000000000001024c]
/usr/local/msp430/lib/gcc/msp430/4.7.0/../../../../msp430/bin/ld: region
`rom' overflowed by 717 bytes
collect2: error: ld returned 1 exit status
make: *** [build/test.elf] Error 1
make: Target `default' not remade because of errors.
It makes sense that the interrupt vectors (.vectors) will be loaded into
0xff80-0xffff, but why would .rodata overlap that by exactly one byte (at
0xff80)?
And why is .data being put at 0xff82 where it'll stomp on the vector table?
I don't believe there are any relocation attributes in the source, so this
is most likely the default compiler/linker behavior.
All the source is compiled with the same set of switches. Here's an example:
/usr/local/msp430/bin/msp430-gcc -I/usr/local/msp430/include -std=c99 -Wall
-Os -g -mmcu=msp430f5528 -mmemory-model=large -ffunction-sections
-fdata-sections -DMSPGCC -Ibuild -c main.c -o build/obj/main.o
The linker is invoked like this:
/usr/local/msp430/bin/msp430-gcc -mmcu=msp430f5528 -mmemory-model=large
-Wl,-gc-sections <… many .o files …> -o build/test.elf
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