RE: how to check 64bit or 32 bit machine?

[susan xie]

> From: address@hidden
> To: address@hidden
> Date: Wed, 21 Nov 2007 15:47:29 -0500
> Subject: how to check 64bit or 32 bit machine?
> 
> 
> Hi, 
> 
> I want to use a third-party library in my Makefile.am. The static third party 
> library is put in a directory with 2 sub-directories: 'linux' and 'linux64'.
> On 64bit machine, my code needs to link with the static library in 'linux64' 
> directory. While on 32 bit machine, it needs to link with the static library 
> in 'linux' directory.  Do you know how to check 64bit machine or 32 bit 
> machine to finish this task? 
> 
> Thanks in advance. 
> 
> Ting 
> 
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Currently I have 2 ways to finish this. If you happen to know the details, 
please let me know. Thanks very much. 

1. AC_CHECK_SIZEOF(void*) ,  but how to catch the result of this checking 
MACRO,  i.e., checking result of (sizeof(void*)  =4) : yes or no ? I thought of 
 SIZEOF_VOIDP, but then how to use this variable ? 

2.  AC_CANONICAL_BUILD ,   May you show me an example to use this Macro ?  

Please let me know if you have other detailed method :) 











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