gcc 10: can't link a simple (empty) C file

jotd · 05 November 2022, 18:45

using compiler included in Bartman VS code package

Code:

K:\jff\AmigaHD\PROJETS\progs_asm_c_c++\blitter_emu>m68k-amiga-elf-gcc.exe -nostdlib -o test main.c

The output

Code:

k:/progs/vscode-amiga-debug-master/bin/win32/opt/bin/../lib/gcc/m68k-amiga-elf/12.1.0/../../../../m68k-amiga-elf/bin/ld.exe: warning: cannot find entry symbol _start; defaulting to 0000000080000054

Is there a startup code I can use ? or should I define _start myself? (I don't care about parsing argv, opening libs or such)

Eaglef00t · 05 November 2022, 19:09

-nostartfiles (along with -nostdlib)

Jobbo · 05 November 2022, 21:36

Build the sample project using VSCode or grab the files from the plugin folder and start from there.

It has a set of gcc8_c_support files which include the required _start and a handful of lib functions such as memcpy.

The sample makefile uses -nostdlib but it doesn't use -nostartfiles so I suspect doing so is a bad idea.

05 November 2022, 18:45	#1
jotd This cat is no more Join Date: Dec 2004 Location: FRANCE Age: 52 Posts: 8,389	gcc 10: can't link a simple (empty) C file using compiler included in Bartman VS code package Code: K:\jff\AmigaHD\PROJETS\progs_asm_c_c++\blitter_emu>m68k-amiga-elf-gcc.exe -nostdlib -o test main.c The output Code: k:/progs/vscode-amiga-debug-master/bin/win32/opt/bin/../lib/gcc/m68k-amiga-elf/12.1.0/../../../../m68k-amiga-elf/bin/ld.exe: warning: cannot find entry symbol _start; defaulting to 0000000080000054 Is there a startup code I can use ? or should I define _start myself? (I don't care about parsing argv, opening libs or such)

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05 November 2022, 19:09	#2
Eaglef00t Registered User Join Date: Dec 2017 Location: US Posts: 9	-nostartfiles (along with -nostdlib)

05 November 2022, 21:36	#3
Jobbo Registered User Join Date: Jun 2020 Location: Druidia Posts: 389	Build the sample project using VSCode or grab the files from the plugin folder and start from there. It has a set of gcc8_c_support files which include the required _start and a handful of lib functions such as memcpy. The sample makefile uses -nostdlib but it doesn't use -nostartfiles so I suspect doing so is a bad idea.

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