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[Ping][PATCH] fix PR pch/45979 regression on recent ARM/Linux kernels


Ping for http://gcc.gnu.org/ml/gcc-patches/2010-10/msg02252.html

If it helps: I hereby place this patch in the public domain.

On Tue, 26 Oct 2010 20:45:52 +0200, Mikael Pettersson wrote:
 > Post 2.6.35 ARM/Linux kernels now randomize mmap() by default,
 > which breaks precompiled headers.  See PR pch/45979.
 > 
 > Fixed by supplying an explicit hint for a likely free area
 > in the address space for precompiled headers to use, similar
 > to what has already been done for many other Linux archs.
 > Based on observation from several largish processes on an
 > arm-linux-gnueabi machine, 0xa0000000 seems to be a good
 > choice: it's just under the stack and at the end of a large
 > area populated by shared libraries.
 > 
 > Tested with gcc-4.6/4.5/4.4 on arm-linux-gnueabi running
 > 2.6.36-rcN kernels.  Fixed all pch testsuite failures, with
 > no new regressions.
 > 
 > Ok for trunk/4.5/4.4?  (I don't havn svn write access.)
 > 
 > gcc/
 > 
 > 2010-10-26  Mikael Pettersson  <mikpe@it.uu.se>
 > 
 > 	PR pch/45979
 > 	* config/host-linux.c (TRY_EMPTY_VM_SPACE): Define for __ARM_EABI__.
 > 
 > --- gcc-4.6-20101009/gcc/config/host-linux.c.~1~	2009-02-20 16:20:38.000000000 +0100
 > +++ gcc-4.6-20101009/gcc/config/host-linux.c	2010-10-13 15:24:28.000000000 +0200
 > @@ -86,6 +86,8 @@
 >  # define TRY_EMPTY_VM_SPACE	0x60000000
 >  #elif defined(__mc68000__)
 >  # define TRY_EMPTY_VM_SPACE	0x40000000
 > +#elif defined(__ARM_EABI__)
 > +# define TRY_EMPTY_VM_SPACE	0xa0000000
 >  #else
 >  # define TRY_EMPTY_VM_SPACE	0
 >  #endif


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