Re: target/8507: [Cygwin] -fno-undersocring, -fno-underscore don't work

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From: "Benjamin K." <bkausbk@web.de>
To: nobody@gcc.gnu.org
Cc: gcc-prs@gcc.gnu.org,
Subject: Re: target/8507: [Cygwin] -fno-undersocring, -fno-underscore don't work
Date: Sat, 11 Jan 2003 12:46:00 -0000	[thread overview]
Message-ID: <20030111124601.28376.qmail@sources.redhat.com> (raw)

The following reply was made to PR target/8507; it has been noted by GNATS.

>From bkausbk@web.de  Mon Jan 13 00:57:58 2003
From: "Benjamin K." <bkausbk@web.de>
To: <bkausbk@web.de>,
	<gcc-gnats@gcc.gnu.org>,
	<gcc-prs@gcc.gnu.org>,
	<gcc-bugs@gcc.gnu.org>,
	<nobody@gcc.gnu.org>
Cc:  
Subject: Re: target/8507: [Cygwin] -fno-undersocring, -fno-underscore don't work
Date: Sat, 11 Jan 2003 13:38:36 +0100

 This is a multi-part message in MIME format.
 
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 Content-Type: text/plain;
 	charset="Windows-1252"
 Content-Transfer-Encoding: 7bit
 
 http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&p
 r=8507
 
 >Can you give a small program that shows the problem
 This is compiler specific as I said before, and problem is whidly known who
 is using c compilers for i386 windows platform.
 
 See attachment for detailed information.
 "some.o.hexdump" contains some more information about the problem.
 There are 2 hexdumps, one which uses symbol underscores and the other
 one don't use this underscores.
 some.c is the source file ... needless to say it only contain one function.
 
 Benjamin Kalytta
 
 ------=_NextPart_000_0003_01C2B976.BE468F90
 Content-Type: application/octet-stream;
 	name="some.c"
 Content-Transfer-Encoding: 7bit
 Content-Disposition: attachment;
 	filename="some.c"
 
 int MyFunc(){
 }
 
 ------=_NextPart_000_0003_01C2B976.BE468F90
 Content-Type: application/octet-stream;
 	name="some.o.hexdump"
 Content-Transfer-Encoding: quoted-printable
 Content-Disposition: attachment;
 	filename="some.o.hexdump"
 
 COFF OBJECT FILE DUMP:
 
 00000000   4C 01 03 00 00 00 00 00  9C 00 00 00 0A 00 00 00   =
 L.......=9C.......
 00000010   00 00 05 00 2E 74 65 78  74 00 00 00 00 00 00 00   =
 .....text.......
 00000020   00 00 00 00 10 00 00 00  8C 00 00 00 00 00 00 00   =
 ........=8C.......
 00000030   00 00 00 00 00 00 00 00  20 00 00 60 2E 64 61 74   ........ =
 ..`.dat
 00000040   61 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00   =
 a...............
 00000050   00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00   =
 ................
 00000060   40 00 00 C0 2E 62 73 73  00 00 00 00 00 00 00 00   =
 @..=C0.bss........
 00000070   00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00   =
 ................
 00000080   00 00 00 00 00 00 00 00  80 00 00 C0 55 89 E5 5D   =
 ........=80..=C0U=89=E5]
 00000090   C3 90 90 90 90 90 90 90  90 90 90 90 2E 66 69 6C   =
 =C3=90=90=90=90=90=90=90=90=90=90=90.fil
 000000A0   65 00 00 00 00 00 00 00  FE FF 00 00 67 01 73 6F   =
 e.......=FE=FF..g.so
 000000B0   6D 65 2E 63 00 00 00 00  00 00 00 00 00 00 00 00   =
 me.c............
 000000C0   5F 4D 79 46 75 6E 63 00  00 00 00 00 01 00 20 00   =
 _MyFunc....... .
 000000D0   02 01 00 00 00 00 00 00  00 00 00 00 00 00 00 00   =
 ................
 000000E0   00 00 00 00 2E 74 65 78  74 00 00 00 00 00 00 00   =
 .....text.......
 000000F0   01 00 00 00 03 01 05 00  00 00 00 00 00 00 00 00   =
 ................
 00000100   00 00 00 00 00 00 00 00  2E 64 61 74 61 00 00 00   =
 .........data...
 00000110   00 00 00 00 02 00 00 00  03 01 00 00 00 00 00 00   =
 ................
 00000120   00 00 00 00 00 00 00 00  00 00 00 00 2E 62 73 73   =
 .............bss
 00000130   00 00 00 00 00 00 00 00  03 00 00 00 03 01 00 00   =
 ................
 00000140   00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00   =
 ................
 00000150   04 00 00 00                                        ....
 
 Symbol of function int MyFunc() will be "_MyFunc" as you see above.
 Here the same thing with my modified version of GCC which don't produce =
 any
 underscore:
 
 00000000   4C 01 03 00 00 00 00 00  9C 00 00 00 0A 00 00 00   =
 L.......=9C.......
 00000010   00 00 05 00 2E 74 65 78  74 00 00 00 00 00 00 00   =
 .....text.......
 00000020   00 00 00 00 10 00 00 00  8C 00 00 00 00 00 00 00   =
 ........=8C.......
 00000030   00 00 00 00 00 00 00 00  20 00 00 60 2E 64 61 74   ........ =
 ..`.dat
 00000040   61 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00   =
 a...............
 00000050   00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00   =
 ................
 00000060   40 00 00 C0 2E 62 73 73  00 00 00 00 00 00 00 00   =
 @..=C0.bss........
 00000070   00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00   =
 ................
 00000080   00 00 00 00 00 00 00 00  80 00 00 C0 55 89 E5 5D   =
 ........=80..=C0U=89=E5]
 00000090   C3 90 90 90 90 90 90 90  90 90 90 90 2E 66 69 6C   =
 =C3=90=90=90=90=90=90=90=90=90=90=90.fil
 000000A0   65 00 00 00 00 00 00 00  FE FF 00 00 67 01 73 6F   =
 e.......=FE=FF..g.so
 000000B0   6D 65 2E 63 00 00 00 00  00 00 00 00 00 00 00 00   =
 me.c............
 000000C0   4D 79 46 75 6E 63 00 00  00 00 00 00 01 00 20 00   =
 MyFunc........ .
 000000D0   02 01 00 00 00 00 00 00  00 00 00 00 00 00 00 00   =
 ................
 000000E0   00 00 00 00 2E 74 65 78  74 00 00 00 00 00 00 00   =
 .....text.......
 000000F0   01 00 00 00 03 01 05 00  00 00 00 00 00 00 00 00   =
 ................
 00000100   00 00 00 00 00 00 00 00  2E 64 61 74 61 00 00 00   =
 .........data...
 00000110   00 00 00 00 02 00 00 00  03 01 00 00 00 00 00 00   =
 ................
 00000120   00 00 00 00 00 00 00 00  00 00 00 00 2E 62 73 73   =
 .............bss
 00000130   00 00 00 00 00 00 00 00  03 00 00 00 03 01 00 00   =
 ................
 00000140   00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00   =
 ................
 00000150   04 00 00 00                                        ....
 
 As you can see here, symbol "MyFunc" don't have leading underscores.
 You have to modify /gcc/gcc/config/i386/bsd.h
 #define USER_LABEL_PREFIX "_" to
 #define USER_LABEL_PREFIX ""
 
 But there are some problems again, libgcc.a and some other libs contain
 symbols with underscores, so using any of this lib function isn't =
 possible with
 my modified version.
 
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next             reply	other threads:[~2003-01-11 12:46 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-01-11 12:46 Benjamin K. [this message]
  -- strict thread matches above, loose matches on Subject: below --
2003-05-12 11:28 steven
2003-01-11  1:43 bangerth

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