Warning #10229-D output section ".data" refers to load symbol ".init_array" and hence cannot be compressed; compression "lzss" is ignored.

Simon Patterson

Hi,

I am getting a warning when compiling a simple project. The project compiles ok and works on real hardware but this warning has only just appeared and wasn't there at the start of the project.

Warning #10229-D output section ".data" refers to load symbol ".init_array" and hence cannot be compressed; compression "lzss" is ignored.

I have 3 structs to control peripherals, which are declared as so:

struct declarations

The memory allocation shows like this:

project memory allocation

My question is: Why does the first struct to be declared, SENSE_L, get put in the .data section and the rest are put in .bss ?

If I swap the SENSE_L and SENSE_R declarations then SENSE_R is placed in .data instead, so it's always the first to be declared that is placed in .data.

This has only just started happening, in earlier versions all were placed in .bss.

The only recent change I have made is to use class enums instead of straight enums and added an operator& override.

over 3 years ago

0 Simon Patterson over 3 years ago

Prodigy 20 points

I've since realized that using Optimization Level 2+ causes this.

Using Level 0 or Level 1 places all 7 objects in .bss where they should be, but causes an almost doubling of the code size.

0 Xiaodong LI over 3 years ago in reply to Simon Patterson

TI__Mastermind 26195 points

Hi Simom

May I know the CCS version and compiler version you used.

This issue appeared before, there is some discussion on E2E thread in https://e2e.ti.com/support/tools/code-composer-studio-group/ccs/f/code-composer-studio-forum/561407/compiler-msp430f5310-10229-d-output-section-data-refers-to-load-symbol-_nop-and-hence-cannot-be-compressed-ccs-6-2-msp430f5310-compiler-16-9-1 and https://e2e.ti.com/support/tools/code-composer-studio-group/ccs/f/code-composer-studio-forum/86954/arm-4-6-4-linker-warning

could you please check these previous discussion? hope these information is the helpful reference.

Thanks!

0 Simon Patterson over 3 years ago in reply to Xiaodong LI

Prodigy 20 points

CCS version 12.3.0

Compiler version 21.6.0 LTS

I looked the 2 threads you mentioned and I found those before posting, but they don't seem to have anything to do with my issue, as I am not using extern's, pointers or arrays.

I've been doing some investigating and found a simple test case that triggers this warning:

#include "driverlib/driverlib.h"

struct Device_Output {
	const unsigned char m_a;
	const unsigned char m_b;
	Device_Output(const unsigned char a, const unsigned char b)
		: m_a(a), m_b(b)
	{
		GPIO_setOutputLowOnPin(m_a, m_b);
		GPIO_setOutputLowOnPin(m_a, m_b);
	}
};

Device_Output OUT_A(GPIO_PORT_P1, GPIO_PIN0);
Device_Output OUT_B(GPIO_PORT_P1, GPIO_PIN1);

int main(void) { }

If i remove one of the double GPIO_... calls then the warning disappears.

I can see no obvious reason why this is happening.

0 Simon Patterson over 3 years ago in reply to Simon Patterson

Prodigy 20 points

I managed to fix it by changing the structs to template structs.

As the structs are used as an abstraction layer and all methods are static and all data is const and known at compile time, they don't need to be true objects in .bss or .data so code size in nicely reduced too from 2698 bytes to 2284 bytes.

Many thanks

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Warning #10229-D output section ".data" refers to load symbol ".init_array" and hence cannot be compressed; compression "lzss" is ignored.