[CMake] 64bit linking on linux

[Birju Prajapati]

I've figured it out. I added the following lines into the root
CMakeLists.txt file:

 

SET(CMAKE_CXX_FLAGS "-m64")

SET(CMAKE_C_FLAGS "-m64")

SET(CMAKE_EXE_LINKER_FLAGS "-m64")

SET(CMAKE_MODULE_LINKER_FLAGS "-m64")

SET(CMAKE_SHARED_LINKER_FLAGS "-m64")

 

Could someone point me to where this is in the documentation? 

I couldn't find this anywhere in

 

http://www.cmake.org/cmake/help/cmake2.6docs.html

 

and had to figure it out by grepping.

 

TIA,

Birju

 

From: cmake-bounces at cmake.org [mailto:cmake-bounces at cmake.org] On Behalf
Of Birju Prajapati
Sent: 18 February 2009 13:32
To: cmake at cmake.org
Subject: [CMake] 64bit linking on linux

 

Hi,

I have a simple CMakeLists.txt file, in a directory called 'multicast':

 

cmake_minimum_required(VERSION 2.6)

include_directories(../.. /usr/local/include/boost-1_38)

add_library(spreadx_multicast SHARED Message.cpp MulticastChannel.cpp)

 

This successfully gives me a 64 bit .so:

 

birju at cavewks7181:~/Dev/spreadx/multicast$ file libspreadx_multicast.so

libspreadx_multicast.so: ELF 64-bit LSB shared object, x86-64, version 1
(SYSV), dynamically linked, not stripped

 

However, there is a problem when I try and invoke that from a directory
above with the following CMakeLists.txt file:

 

cmake_minimum_required (VERSION 2.6)

project (SPREADX)

add_subdirectory (multicast)

 

This gives me a 32 bit .so:

birju at cavewks7181:~/Dev/spreadx$ file multicast/libspreadx_multicast.so

multicast/libspreadx_multicast.so: ELF 32-bit LSB shared object, Intel
80386, version 1 (SYSV), dynamically linked, not stripped

 

Why does it in one case generate a 64 bit lib, and in the other, a 32
bit one?

 

TIA,

Birju

 

 

 

Schneider Trading
4th Floor,
25 Copthall Avenue
London EC2R 7BP

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Schneider Trading
4th Floor,
25 Copthall Avenue
London EC2R 7BP

--------------------------------------------------------



Message from: Birju.Prajapati at schneidertrading.com
Message to: cmake at cmake.org
Attached files: 0
This e-mail and any files transmitted with it are confidential, may be legally privileged, and are for the sole use of the intended recipient. Copyright in this e-mail and any accompanying document created by us is owned by us. If you are not the intended recipient of this e-mail or any part of it please telephone our IT Department at the number shown above or by e-mail at info at schneidertrading.com. 
You should not use or disclose to any other person the contents of this e-mail or its attachments (if any), nor take copies. This e-mail is not a representation or warranty and is not intended nor should it be taken to create any legal relations, contractual or otherwise.
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