Re: Building 32-bit RPM on 64-bit Linux

[Andreas Schneider <asn@xxxxxxxxxxxxxx>]

On Monday 12 January 2015 17:12:18 Mike Jones wrote:
> Hoping for some wisdom/advice. I am not very familiar with the mechanics
> of CMake yet. (I'm a GNU make guy.)
> Trying to build a 32-bit (i686) RPM of libssh on RedHat Enterprise Linux
> 7 (which is x86_64).
> Borrowing the RHEL6 SRPM from here:
> 
> http://download.opensuse.org/repositories/network:/synchronization:/files/Re
> dHat_RHEL-6/src/libssh-0.6.4-16.1.src.rpm
> 
> I can easily make  the default 64-bit (x86_64) RPM using this file.
> 
> When I build for i686, the library builds fine, but then the make fails
> on one of the examples, libsshpp.
> The problem is that, unlike all the other examples, CMake is not setting
> the compile and link flags to have the -m32 option.
> In fact, none of the other compile/link flags are present in just that
> one example.
> 
> Trying to figure out what is different about libsshpp compared to all
> the others...

It works just fine on CentOS6 ...

https://build.opensuse.org/build/network:synchronization:files/CentOS_CentOS-6/i586/libssh/_log

As you can see the rpm optflags are:
-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --
param=ssp-buffer-size=4 -m32 -march=i686 -mtune=atom -fasynchronous-unwind-
tables -DOPENSSL_LOAD_CONF

They are passed to cmake using -DCMAKE_C_FLAGS:STRING

If you search the file for libsshpp you can see that the example compiles just 
fine.


Cheers,


	-- andreas


-- 
Andreas Schneider                   GPG-ID: CC014E3D
www.cryptomilk.org                asn@xxxxxxxxxxxxxx