Sender: richdawe AT bigfoot DOT com
Message-ID: <3A158878.2C59BE68@bigfoot.com>
Date: Fri, 17 Nov 2000 19:35:20 +0000
From: Richard Dawe <richdawe AT bigfoot DOT com>
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To: djgpp-workers AT delorie DOT com
Subject: Re: Help: Isn't libdbg the debugging version of libc?
References: <5 DOT 0 DOT 1 DOT 4 DOT 0 DOT 20001116230739 DOT 00a55af0 AT pop5 DOT banet DOT net>
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Reply-To: djgpp-workers AT delorie DOT com

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Hello.

"Peter J. Farley III" wrote:
[snip]
> Collected errors/warnings during full libc build:
[snip]
> gcc ... -c dbgcom.c
> dbgcom.c:25: warning: `id' defined but not used
> o:/tmp\ccirTSlS.s: Assembler messages:
> o:/tmp\ccirTSlS.s:530: Warning: Indirect lcall without `*'
> o:/tmp\ccirTSlS.s:559: Warning: Indirect ljmp without `*'

I got bitten by the lcall problem with libsocket. I've enclosed below the
'binutils' (well, 'as') version detection I used in libsocket's config
Makefile. Some comment lines have wrapped.

[Start Makefile extract]
#
# Binutils detection - as (the assembler) from binutils 2.8.1 and 2.9.5.1
beta
# handle the lcall mnemonic slightly differently. The assembly has
# #ifdef/#else/#endif to ensure that it compiles without warnings.
#
# OK, this is a bit ugly, but we have no choice. Unfortunately, it means
sed
# is required to build libsocket.
#

GAS_VERSION := $(shell $(AS) --version | sed -n 's/^GNU assembler //p')

GAS_MAJOR := \
        $(shell echo $(GAS_VERSION) \
          | sed -n 's/^\([0-9][0-9]*\).*/\1/p')

GAS_MINOR := \
        $(shell echo $(GAS_VERSION) \
          | sed -n 's/^[0-9][0-9]*\.\([0-9][0-9]*\).*/\1/p')

GAS_MINORMINOR := \
        $(shell echo $(GAS_VERSION) \
          | sed -n 's/^[0-9][0-9]*\.[0-9][0-9]*\.\([0-9][0-9]*\).*/\1/p')

# Defaults for version numbers
ifeq ($(GAS_MAJOR),)
GAS_MAJOR := 0
endif
ifeq ($(GAS_MINOR),)
GAS_MINOR := 0
endif
ifeq ($(GAS_MINORMINOR),)
GAS_MINORMINOR := 0
endif

# Pass defines as compiler switches
CFLAGS += -DGAS_MAJOR=$(GAS_MAJOR)
CFLAGS += -DGAS_MINOR=$(GAS_MINOR)
CFLAGS += -DGAS_MINORMINOR=$(GAS_MINORMINOR)
[End Makefile extract]

You can then do conditionals in your assembly, e.g.

    __asm__ __volatile__ (
#if    (GAS_MAJOR == 2) \
    && ((GAS_MINOR < 9) || ((GAS_MINOR == 9) && (GAS_MINORMINOR < 5)))
                          "   lcall _csock_entry      \n\
                          "
#else    
                          "   lcall *_csock_entry      \n\
                          "
#endif    
                          "   jc 1f                   \n\
                              xorl %%eax, %%eax       \n\
                           1:"
                          : "=a" (ret), "=b" (dest_port),
                            "=c" (dest_addr)
                          : "a" (12), "D" (csock->fd), "d" (i)
                          : "cc");

This is not very pretty, but I could not find any way of making the code
compiled without any warnings/errors with binutils 2.8.1 and 2.95.2 from
the same sources.

I'm not suggesting this be incorporated into the DJGPP build, since it
would add a dependency on sed, but it's a solution nonetheless.

Bye, Rich =]

-- 
Richard Dawe
[ mailto:richdawe AT bigfoot DOT com | http://www.bigfoot.com/~richdawe/ ]
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