filetool.sh TC 10.1 trivial display bug: trailing slash in output

Tiny Core Base > TCB Bugs

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Rich:
Hi jazzbiker
It seems everytime Class transitions between Read Only Data (R or r) and Code (T or t) a large block of padding gets
added. The column to the right of Section is the number of bytes between the current line and the previous line. You can
see that number spikes at each transition:

--- Code: ---"tc@E310:~/rotdash$ nm -n -S -t d -a -f sysv rotdash"

"Symbols from rotdash:"

Name Value Class Type Size Section

__gmon_start__ w NOTYPE *UND*
__libc_start_main@@GLIBC_2.0 U FUNC *UND*
access@@GLIBC_2.0 U FUNC *UND*
chdir@@GLIBC_2.0 U FUNC *UND*
fflush@@GLIBC_2.0 U FUNC *UND*
printf@@GLIBC_2.0 U FUNC *UND*
usleep@@GLIBC_2.0 U FUNC *UND*
0 a FILE *ABS*
.comment 0 n
crtstuff.c 0 a FILE *ABS*
crtstuff.c 0 a FILE *ABS*
init.c 0 a FILE *ABS*
rotdash.c 0 a FILE *ABS*
static-reloc.c 0 a FILE *ABS*
.interp 134513012 r
.note.ABI-tag 134513032 r 20
.hash 134513064 r 32
.gnu.hash 134513124 r 60
.dynsym 134513160 r 36
.dynstr 134513320 r 160
.gnu.version 134513430 r 110
.gnu.version_r 134513452 r 22
.rel.dyn 134513484 r 32
.rel.plt 134513500 r 16
.init 134516736 t 3236
_init 134516736 T FUNC .init 0
.plt 134516768 t 32
.text 134516880 t 112
main 134516880 T FUNC 140 .text 0
_start 134517020 T FUNC .text 140
__x86.get_pc_thunk.bx 134517056 T FUNC 4 .text 36
deregister_tm_clones 134517060 t FUNC .text 4
register_tm_clones 134517100 t FUNC .text 40
__do_global_dtors_aux 134517154 t FUNC .text 54
frame_dummy 134517184 t FUNC .text 30
__libc_csu_init 134517186 T FUNC 79 .text 2
__libc_csu_fini 134517265 T FUNC 1 .text 79
.fini 134517268 t 3
_fini 134517268 T FUNC .fini 0
.rodata 134520832 r 3564
_fp_hw 134520832 R OBJECT 4 .rodata 0
_IO_stdin_used 134520836 R OBJECT 4 .rodata 4
.eh_frame 134520852 r 16
__FRAME_END__ 134520852 r OBJECT .eh_frame 0
.init_array 134528772 t 7920
__frame_dummy_init_array_entry 134528772 t OBJECT .init_array 0
__init_array_start 134528772 t NOTYPE .init_array 0
.fini_array 134528776 t 4
__do_global_dtors_aux_fini_array_entry 134528776 t OBJECT .fini_array 0
__init_array_end 134528776 t NOTYPE .init_array 0
.dynamic 134528780 d 4
_DYNAMIC 134528780 d OBJECT .dynamic 0
.got 134529020 d 240
.got.plt 134529024 d 4
_GLOBAL_OFFSET_TABLE_ 134529024 d OBJECT .got.plt 0
.data 134529060 d 36
__data_start 134529060 D NOTYPE .data 0
data_start 134529060 W NOTYPE .data 0
__dso_handle 134529064 D OBJECT .data 4
.bss 134529068 b 4
__TMC_END__ 134529068 D OBJECT .data 0
__bss_start 134529068 B NOTYPE .bss 0
_edata 134529068 D NOTYPE .data 0
stdout@@GLIBC_2.0 134529068 B OBJECT 4 .bss 0
completed.6835 134529072 b OBJECT 1 .bss 4
_end 134529076 B NOTYPE .bss 4
--- End code ---

jazzbiker:
Hi, Rich!
This gaps grows along with the gcc version numbers. I tried the same test with gcc 5.4 and found this gaps in the same places, but being smaller ones.
Gcc is so powerfull and versatile, using it for tiny programs is like stirring the sugar in a tea with the drill )
Your case opened my eyes on tcc, thanks!

jazzbiker:
Stirring sugar again

--- Code: ---tc@box:/tmp$ gcc -c rotdash.c
tc@box:/tmp$ tcc -o rotdash rotdash.o
tc@box:/tmp$ sstrip rotdash
tc@box:/tmp$ ls -l rotdash*
-rwxr-xr-x 1 tc staff 1280 Aug 16 08:54 rotdash
-rw------- 1 tc staff 317 Aug 16 08:53 rotdash.c
-rw-r--r-- 1 tc staff 1156 Aug 16 08:54 rotdash.o

--- End code ---

Rich:
Hi jazzbiker
I did a little digging and I think I figured out some of the reasons for the larger executables. The default linker script changed.
From:
elf_i386.xc # Combines and sorts relocatable sections.
To:
elf_i386.xce # Combines and sorts relocatable sections with a separate code segment.

The formula used to compute gap sizes between code and data changed.

This is the result if you specify the elf_i386.xbn script (Mix code & data on same page; don't align data):

--- Code: ---tc@E310:~/rotdash$ gcc -march=i486 -mtune=i686 -Os -pipe -Wall rotdash.c -o rotdash -Wl,-T/usr/local/lib/ldscripts/elf_i386.xbn
tc@E310:~/rotdash$ ls -l rotdash
-rwxr-xr-x 1 tc staff 4704 Aug 18 01:48 rotdash
tc@E310:~/rotdash$ sstrip rotdash
tc@E310:~/rotdash$ ls -l rotdash
-rwxr-xr-x 1 tc staff 1656 Aug 18 01:48 rotdash
tc@E310:~/rotdash$
--- End code ---

Juanito:
Interesting - there's something I was not aware of..

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