On Wednesday 31 July 2024 00:13:24 LIU Hao wrote:
> 在 2024-07-29 02:58, Pali Rohár 写道:
> > stdio/_scprintf.c:32:20: warning: ‘init_scprintf’ used but never defined
> > static int __cdecl init_scprintf(const char * __restrict__ format, ...);
>
> `static` can be removed as it has no effect. The linkage is specified in
> assembly. For GNU as, symbols are internal by default, and external if
> declared in `.globl`.
After removing 'static', gcc does not show any warning anymore.
I compared assembly output from gcc -S and also objdump --all -dr -s
output, but I'm not sure if it is the correct change.
In gcc -S output the only difference is that after removing "static"
keyboard, the assembly output contains this additional line:
.def _init_scprintf; .scl 2; .type 32; .endef
The whole assembly file after removing "static" looks like:
.text
/APP
.def _init_scprintf; .scl 3; .type 32; .endef
_init_scprintf:
...
.def __vscprintf; .scl 2; .type 32; .endef
.def _init_scprintf; .scl 2; .type 32; .endef
It is correct that _init_scprintf has two ".def" lines?
objdump on object files show these differences:
SYMBOL TABLE:
[ 0](sec -2)(fl 0x00)(ty 0)(scl 103) (nx 1) 0x00000000 _scprintf.c
File
-[ 2](sec 1)(fl 0x00)(ty 20)(scl 3) (nx 1) 0x00000000 _init_scprintf
+[ 2](sec 1)(fl 0x00)(ty 20)(scl 2) (nx 1) 0x00000007 __scprintf
AUX tagndx 0 ttlsiz 0x0 lnnos 0 next 0
-[ 4](sec 1)(fl 0x00)(ty 20)(scl 2) (nx 0) 0x00000007 __scprintf
-[ 5](sec 1)(fl 0x00)(ty 20)(scl 3) (nx 0) 0x00000010 _emu_scprintf
-[ 6](sec 1)(fl 0x00)(ty 20)(scl 3) (nx 0) 0x00000030 _resolve_scprintf
+[ 4](sec 1)(fl 0x00)(ty 20)(scl 3) (nx 0) 0x00000010 _emu_scprintf
+[ 5](sec 1)(fl 0x00)(ty 20)(scl 3) (nx 0) 0x00000030 _resolve_scprintf
+[ 6](sec 1)(fl 0x00)(ty 20)(scl 2) (nx 0) 0x00000000 _init_scprintf
[ 7](sec 1)(fl 0x00)(ty 0)(scl 3) (nx 1) 0x00000000 .text
AUX scnlen 0x7e nreloc 9 nlnno 0
[ 9](sec 2)(fl 0x00)(ty 0)(scl 3) (nx 1) 0x00000000 .data
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