Re: [Xen-devel] [PATCH] mini-os: link to libgcc.a to fix build with gcc7

[Wei Liu <wei.liu2@xxxxxxxxxx>]

CC minios-devel

On Mon, Jun 26, 2017 at 03:28:35PM +0200, Olaf Hering wrote:
> gcc7 generates a call to __udivmoddi4 ...
> 
> stubdom/mini-os-x86_32-grub/mini-os.o: In function `_strtoll_r':
> stubdom/newlib-x86_32/i686-xen-elf/newlib/libc/stdlib/../../../../../newlib-1.16.0/newlib/libc/stdlib/strtoll_r.c:110:
>  undefined reference to `__udivmoddi4'
> make[2]: *** [Makefile:167: stubdom/mini-os-x86_32-grub/mini-os] Error 1
> 
> ... which the linker only finds if libgcc.a is provided on the commandline.
> 
> Signed-off-by: Olaf Hering <olaf@xxxxxxxxx>
> ---
>  Makefile | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/Makefile b/Makefile
> index ef8559b..b9c1336 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -162,7 +162,7 @@ $(OBJ_DIR)/arch/x86/minios-x86%.lds:  
> arch/x86/minios-x86.lds.S
>       $(CPP) $(ASFLAGS) -P $< -o $@
>  
>  $(OBJ_DIR)/$(TARGET): $(OBJS) $(APP_O) arch_lib 
> $(OBJ_DIR)/$(TARGET_ARCH_DIR)/minios-$(MINIOS_TARGET_ARCH).lds
> -     $(LD) -r $(LDFLAGS) $(HEAD_OBJ) $(APP_O) $(OBJS) $(LDARCHLIB) $(LDLIBS) 
> -o $@.o
> +     $(LD) -r $(LDFLAGS) $(HEAD_OBJ) $(APP_O) $(OBJS) $(LDARCHLIB) $(LDLIBS) 
> $$(gcc -print-libgcc-file-name $(CFLAGS)) -o $@.o

Append it to LDLIBS?

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