linux-kernel - Re: Current git fails to compile

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Message-ID: <20080718091441.GR6875@elte.hu>
Date:	Fri, 18 Jul 2008 11:14:41 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Dhaval Giani <dhaval@...ux.vnet.ibm.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	lkml <linux-kernel@...r.kernel.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: Current git fails to compile


* Dhaval Giani <dhaval@...ux.vnet.ibm.com> wrote:

> Hi Ingo, Thomas,
> 
> Today's git fails to compile for me with
> (5b664cb235e97afbf34db9c4d77f08ebd725335e)
> 
> arch/x86/mm/pgtable.c: In function `pgd_mop_up_pmds':
> arch/x86/mm/pgtable.c:194: warning: unused variable `pmd'
> arch/x86/mm/pgtable.c: In function `pgd_prepopulate_pmd':
> arch/x86/mm/pgtable.c:222: internal compiler error: in remove_insn, at
> emit-rtl.c:3829
> Please submit a full bug report,
> with preprocessed source if appropriate.
> See <URL:http://bugzilla.redhat.com/bugzilla> for instructions.
> Preprocessed source stored into /tmp/ccJG8rDB.out file, please attach
> this to your bugreport.
> make[1]: *** [arch/x86/mm/pgtable.o] Error 1
> make: *** [arch/x86/mm] Error 2
> [root@...11 linux-2.6]# 
> 
> [root@...11 linux-2.6]# gcc -v
> Reading specs from /usr/lib/gcc/i386-redhat-linux/3.4.4/specs
> Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
> --infodir=/usr/share/info --enable-shared --enable-threads=posix
> --disable-checking --with-system-zlib --enable-__cxa_atexit
> --disable-libunwind-exceptions --enable-java-awt=gtk
> --host=i386-redhat-linux
> Thread model: posix
> gcc version 3.4.4 20050721 (Red Hat 3.4.4-2)
> [root@...11 linux-2.6]# 

so old-gcc crapped up.

Any chance you could try something like:

  git-bisect good v2.6.26
  git-bisect bad linus/master
  git-bisect run make arch/x86/mm/pgtable.o

... if we know which change caused this maybe we can work this gcc bug 
around.

	Ingo
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