Gameboy Development Forum

talien · 2026-01-03 17:47:58

I'm seeing a strange error when trying to link objects generated by sdcc using rgblink.
I'm not sure if this simply isn't supported or if I'm doing something wrong.

Compiling the below C code and linking with rgblink (even with only one linker input) and a basic linkerscript results in the error "FATAL: 'T' lines which don't append to their section are not supported (271 != 273)"

Removing the line marked "bad line" will make the error disappear.

Any insight would be appreciated!

Code:

const char some_text[] = "abcdefg\0";

extern void call_asm(char* text);

struct some_struct{
   char    x;
   char    y;
   const char  *text;   
};

void some_func(void){
    struct some_struct thing = {.x = 5, .y = 5, .text = some_text}; //<-- BAD LINE
    call_asm(some_text);
}

Rangi · 2026-07-14 11:50:01

With SDCC 4.2.0 and RGBDS 1.0.1, I cannot reproduce this.

The linkerscript, script.link:

Code:

ROM0
    FLOATING
    "_HOME" OPTIONAL
    "_BASE" OPTIONAL
    "_CODE_0" OPTIONAL
    "_LIT_0" OPTIONAL
    "_INITIALIZER" OPTIONAL
    "_GSINIT" OPTIONAL
    "_GSFINAL" OPTIONAL

ROMX FLOATING
    FLOATING
    "_CODE" OPTIONAL
    "_LIT" OPTIONAL

WRAM0
    FLOATING
    "_DATA" OPTIONAL
    "_BSS" OPTIONAL
    "_INITIALIZED" OPTIONAL
    "_DABS (ABS)" OPTIONAL

A dummy .asm file for your call_asm function, bar.asm:

Code:

section "bar", rom0
_call_asm::
    ret

And here's how it builds, no error message:

Code:

$ sdcc -c -msm83 -o foo.rel foo.c
$ rgbasm -o bar.o bar.asm
$ rgblink -l script.link -o rom.gb foo.rel bar.o
$ wc -c rom.gb
32768 rom.gb
$ xxd rom.gb | grep -v '0000 0000 0000 0000 0000 0000 0000 0000'
00000000: c900 0000 0000 0000 0000 0000 0000 0000  ................
00004000: e8fc f800 3e05 2222 3e16 2236 4011 1640  ....>."">."6@..@
00004010: cd00 00e8 04c9 6162 6364 6566 6700 0000  ......abcdefg...

(The order of objects doesn't matter; "bar.o foo.rel" works too.)

For reference, this is the SDCC output, foo.rel:

Code:

XL3
H 9 areas 4 global symbols
M foo
O -msm83
S _call_asm Ref000000
S .__.ABS. Def000000
A _CODE size 1F flags 0 addr 0
S _some_func Def000000
S _some_text Def000016
A _DATA size 0 flags 0 addr 0
A _INITIALIZED size 0 flags 0 addr 0
A _DABS size 0 flags 8 addr 0
A _HOME size 0 flags 0 addr 0
A _GSINIT size 0 flags 0 addr 0
A _GSFINAL size 0 flags 0 addr 0
A _INITIALIZER size 0 flags 0 addr 0
A _CABS size 0 flags 8 addr 0
T 00 00 00
R 00 00 00 00
T 00 00 00 E8 FC F8 00 3E 05 22 22 3E 16 00 00 22
R 00 00 00 00 09 0C 00 00
T 0B 00 00 36 16 00 00 11 16 00 CD 00 00 E8 04 C9
R 00 00 00 00 89 04 00 00 00 08 00 00 02 0B 00 00
T 16 00 00
R 00 00 00 00
T 16 00 00 61 62 63 64 65 66 67 00 00
R 00 00 00 00

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#1 2026-01-03 17:47:58

Linker error using both sdcc and rgbasm

Code:

#2 2026-07-14 11:50:01

Re: Linker error using both sdcc and rgbasm

Code:

Code:

Code:

Code:

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