On Tue, Sep 24, 2019 at 11:24 AM Nathan Chancellor <[email protected]> wrote: > > On Mon, Sep 23, 2019 at 03:24:02PM -0700, 'Nick Desaulniers' via Clang Built > Linux wrote: > > Linking with ld.lld via $ make LD=ld.lld produces the warning: > > ld.lld: warning: cannot find entry symbol _start; defaulting to 0x1000 > > > > Linking with ld.bfd shows the default entry is 0x1000: > > $ readelf -h arch/x86/realmode/rm/realmode.elf | grep Entry > > Entry point address: 0x1000 > > > > While ld.lld is being pedantic, just set the entry point explicitly, > > instead of depending on the implicit default. > > > > Link: https://github.com/ClangBuiltLinux/linux/issues/216 > > Signed-off-by: Nick Desaulniers <[email protected]> > > --- > > arch/x86/realmode/rm/realmode.lds.S | 1 + > > 1 file changed, 1 insertion(+) > > > > diff --git a/arch/x86/realmode/rm/realmode.lds.S > > b/arch/x86/realmode/rm/realmode.lds.S > > index 3bb980800c58..2034f5f79bff 100644 > > --- a/arch/x86/realmode/rm/realmode.lds.S > > +++ b/arch/x86/realmode/rm/realmode.lds.S > > @@ -11,6 +11,7 @@ > > > > OUTPUT_FORMAT("elf32-i386") > > OUTPUT_ARCH(i386) > > +ENTRY(0x1000) > > > > SECTIONS > > { > > -- > > 2.23.0.351.gc4317032e6-goog > > > > This appears to break ld.bfd? > > ld:arch/x86/realmode/rm/realmode.lds:131: syntax error > make[5]: *** [../arch/x86/realmode/rm/Makefile:54: > arch/x86/realmode/rm/realmode.elf] Error 1 > make[4]: *** [../arch/x86/realmode/Makefile:20: > arch/x86/realmode/rm/realmode.bin] Error 2 > make[3]: *** [../scripts/Makefile.build:509: arch/x86/realmode] Error 2
Thanks for testing. Strange, it seems that ld.bfd doesn't like it as an ENTRY in the linker script, but will accept `-e <addr>`. Not sure if that's a bug in ld.bfd, or if ld.lld should error as well? https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/4/html/Using_ld_the_GNU_Linker/simple-commands.html v2 inbound. -- Thanks, ~Nick Desaulniers
