Hi,
I have a USB driver for the msp430 5xx series which allocates the USB
buffers at the proper addresses in the USB RAM using asm("0xaddr")
statements.
With the 20120911 compiler, when using "-fdata-sections" the code no
longer compiles. For example, with the following code:
#include <msp430.h>
#include <stdint.h>
#include <string.h>
#define EP0_MAX_PACKET_SIZE 0x08
static uint8_t iep0_buf[EP0_MAX_PACKET_SIZE] asm("0x2378");
int main()
{
memset(&iep0_buf[0], 0, sizeof(iep0_buf));
return 0;
}
ionut@heimdall:~$ msp430-gcc -mmcu=msp430f5528 -fdata-sections -c main.c
-o main.o
/tmp/ccaEQtpB.s: Assembler messages:
/tmp/ccaEQtpB.s:8: Error: Missing symbol name in directive
/tmp/ccaEQtpB.s:8: Error: junk at end of line, first unrecognized
character is `x'
/tmp/ccaEQtpB.s:9: Error: expected comma after name `' in .size
directive
/tmp/ccaEQtpB.s:10: Error: junk at end of line, first unrecognized
character is `0'
If I remove the "-fdata-sections" option, the code compiles just fine.
In my project, since it's being used for multiple devices, there are a
lot of things (code and data) that need to be stripped if they're not
used. That's why I need to use "-fdata-sections -ffunction-sections
-Wl,--gc-sections" to eliminate data and code that isn't used.
Trying the same code with the x86 gcc shows the same problem, so I guess
this is not mspgcc specific, but rather something that changed in newer
versions of gcc.
Does anyone have a suggestion on how to solve this? I thought about
declaring sections for each variable in a custom linker file and then
using __attribute__((section(".section_name"))) when declaring the
variables, but I think it's an ugly solution.
Thanks,
Ionut.
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