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        Thu, 10 Dec 2020 08:21:54 -0800 (PST)
Subject: Re: Difficulties compiling libc from repository using gcc 10.N.0
To: djgpp AT delorie DOT com
References: <5FD1FEA1 DOT 7010304 AT gmx DOT de>
From: "J.W. Jagersma (jwjagersma AT gmail DOT com) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
Message-ID: <8e0f1fc3-7a37-9927-5978-1819609c7e6f@gmail.com>
Date: Thu, 10 Dec 2020 17:21:36 +0100
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On 2020-12-10 11:55, Juan Manuel Guerrero (juan DOT guerrero AT gmx DOT de) [via djgpp AT delorie DOT com] wrote:
> I have tried to compile the the repository code of libc and the compiler stoped with the follwing error message:
> 
> C:/DJGPP-2.05/BIN/make.exe -C common
> gcc ... -c dbgcom.c
> dbgcom.c: Assembler messages:
> dbgcom.c:1342: Error: symbol `.Ldoes_not_has_read_right' is already defined
> dbgcom.c:1346: Error: symbol `.Ldoes_not_has_write_right' is already defined
> make[3]: *** [../../makefile.inc:90: dbgcom.o] Error 1
> make[2]: *** [makefile.sub:2: all_subs] Error 2
> make[1]: *** [../makefile.lib:7: all] Error 2
> make: *** [makefile:45: subs] Error 2
> 
> I have tried this using gcc1010 and gcc1020.  Both fails.  If I use gcc920
> everything works fine.  In all cases bnu234b has been used and no other one
> has been tried.

I ran into this also with gcc 9, I guess it depends on the optimization flags
you specify (I like to use -O3).  I think local labels should start with 'L'
only (no leading '.'), that is also how gcc generates label names.

If the asm is inlined into the same function twice, then you still have
duplicate local labels and you need to add add %= to the label name which
generates a unique ID for each asm instance.