Bug#195123: marked as done (libc6-dev: Bug in alloca.h for compilers other than gcc)
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From: "Silas S. Brown" <ssb22@cam.ac.uk>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: libc6-dev: Bug in alloca.h for compilers other than gcc
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Package: libc6-dev
Version: 2.2.5-11.5
Severity: normal
In /usr/include/alloca.h we find
--------------------------------------------------------
extern void *alloca (size_t __size) __THROW;
#ifdef __GNUC__
# define alloca(size) __builtin_alloca (size)
#endif /* GCC. */
--------------------------------------------------------
Things work fine with gcc, but they don't with anything else
- the alloca referred to in the extern void* doesn't seem to
exist in the libraries.
In particular, I tried TCC (package tcc) and I used it to
compile lwc version 0.5, available at
http://students.ceid.upatras.gr/~sxanth/lwc/lwc-0.5.tar.bz2
(I replaced gcc with tcc in the Makefile) and the result was
tcc -O2 main.c objdir/*.o -o objdir/lwc
tcc: undefined symbol 'alloca'
and also I tried doing this last step with gcc, but with
similar results:
gcc -O2 main.c objdir/*.o -o objdir/lwc
objdir/dcl.o: In function `add_this':
objdir/dcl.o(.text+0x1152): undefined reference to `alloca'
objdir/dcl.o: In function `mark_function_def':
objdir/dcl.o(.text+0x2702): undefined reference to `alloca'
objdir/dcl.o: In function `pdcl_function':
objdir/dcl.o(.text+0x2871): undefined reference to `alloca'
objdir/dcl.o: In function `send_virtual':
objdir/dcl.o(.text+0x29f4): undefined reference to `alloca'
objdir/dcl.o(.text+0x2ab8): undefined reference to `alloca'
objdir/dcl.o(.text+0x32f4): more undefined references to `alloca' follow
collect2: ld returned 1 exit status
but it worked fine with gcc-3.0 in the Makefile instead of
tcc.
(I wasn't sure whether to report this as libc6 or libc6-dev)
-- System Information
Debian Release: 3.0
Architecture: i386
Kernel: Linux ssb22 2.4.21-rc1-ssb #13 Tue Apr 29 16:48:19 BST 2003 i686
Locale: LANG=en_GB, LC_CTYPE=en_GB
Versions of packages libc6-dev depends on:
ii libc6 2.2.5-11.5 GNU C Library: Shared libraries an
---------------------------------------
Received: (at 195123-done) by bugs.debian.org; 11 Aug 2004 23:42:37 +0000
>From gotom@debian.or.jp Wed Aug 11 16:42:37 2004
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Date: Thu, 12 Aug 2004 08:42:31 +0900
Message-ID: <81acx15jiw.wl@omega.webmasters.gr.jp>
From: GOTO Masanori <gotom@debian.or.jp>
To: "Silas S. Brown" <ssb22@cam.ac.uk>, 195123-done@bugs.debian.org
Subject: Re: Bug#195123: libc6-dev: Bug in alloca.h for compilers other than gcc
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References: <E19L83U-0007Xn-00@ssb22.joh.cam.ac.uk>
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At Wed, 28 May 2003 22:01:52 +0100,
Silas S. Brown <ssb22@cam.ac.uk> wrote:
> In /usr/include/alloca.h we find
>
> --------------------------------------------------------
> extern void *alloca (size_t __size) __THROW;
>
> #ifdef __GNUC__
> # define alloca(size) __builtin_alloca (size)
> #endif /* GCC. */
> --------------------------------------------------------
>
> Things work fine with gcc, but they don't with anything else
> - the alloca referred to in the extern void* doesn't seem to
> exist in the libraries.
>
> In particular, I tried TCC (package tcc) and I used it to
> compile lwc version 0.5, available at
> http://students.ceid.upatras.gr/~sxanth/lwc/lwc-0.5.tar.bz2
> (I replaced gcc with tcc in the Makefile) and the result was
>
> tcc -O2 main.c objdir/*.o -o objdir/lwc
> tcc: undefined symbol 'alloca'
>
> and also I tried doing this last step with gcc, but with
> similar results:
>
> gcc -O2 main.c objdir/*.o -o objdir/lwc
> objdir/dcl.o: In function `add_this':
> objdir/dcl.o(.text+0x1152): undefined reference to `alloca'
> objdir/dcl.o: In function `mark_function_def':
> objdir/dcl.o(.text+0x2702): undefined reference to `alloca'
> objdir/dcl.o: In function `pdcl_function':
> objdir/dcl.o(.text+0x2871): undefined reference to `alloca'
> objdir/dcl.o: In function `send_virtual':
> objdir/dcl.o(.text+0x29f4): undefined reference to `alloca'
> objdir/dcl.o(.text+0x2ab8): undefined reference to `alloca'
> objdir/dcl.o(.text+0x32f4): more undefined references to `alloca' follow
> collect2: ld returned 1 exit status
>
> but it worked fine with gcc-3.0 in the Makefile instead of
> tcc.
The root problem of this bug is: lwc uses alloca. alloca depends on
the environment and compiler. alloca is not standardized. If you
need to use alloca with tcc, tcc should support them.
I close this bug.
Regards,
-- gotom
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