[PATCH] Fix gdb.dwarf2/clztest.exp with Clang

[Rainer Orth]

Hi Gary,

> Andreas Schwab wrote:
>> On Nov 02 2020, Gary Benson via Gdb-patches wrote:
>> > diff --git a/gdb/testsuite/gdb.dwarf2/clztest.S b/gdb/testsuite/gdb.dwarf2/clztest.S
>> > index a904fee..08a8bac 100644
>> > --- a/gdb/testsuite/gdb.dwarf2/clztest.S
>> > +++ b/gdb/testsuite/gdb.dwarf2/clztest.S
>> > @@ -22,6 +22,12 @@
>> >  
>> >  */
>> >  
>> > +#if defined(__clang__)
>> > +# define EH_FRAME_SH_FLAGS "a"
>> > +#else
>> > +# define EH_FRAME_SH_FLAGS "aw"
>> > +#endif
>> > +
>> >  	.file	"clztest.c"
>> >  	.text
>> >  .Ltext0:
>> > @@ -178,7 +184,7 @@ _start:
>> >  .LEFDE4:
>> >  #NO_APP
>> >  #APP
>> > -	.section	.eh_frame,"aw",@progbits
>> > +	.section	.eh_frame,EH_FRAME_SH_FLAGS,@progbits
>> 
>> Shouldn't .eh_frame always be read-only?
>
> I don't know.
>
>> It certainly is when compiled with gcc.
>
> A comment in that .S file indicated it was originally generated
> using GCC (via gcc -dA -S -g -O2 clztest.c -o clztest.S) but that
> was 2011, so maybe things changed.
>
> I'm happy to change the test to have .eh_frame read-only for all
> compilers, if that seems more correct.

it's not: cf. EH_TABLES_CAN_BE_READ_ONLY in gcc/config/i386/sol2.h and
DWARF2_EH_FRAME_READ_ONLY in gas/config/te-solaris.h and
gas/config/tc-hppa.h.

	Rainer

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Rainer Orth, Center for Biotechnology, Bielefeld University