From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matias Garcia Date: Fri, 06 May 2011 14:38:59 -0400 Subject: [Buildroot] Codesourcery multi-lib selection in buildroot In-Reply-To: <20110505211023.142dec32@surf> References: <4DC1BC78.4050103@rossvideo.com> <20110505211023.142dec32@surf> Message-ID: <4DC44043.9030904@rossvideo.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: buildroot@busybox.net On 11-05-05 03:10 PM, Thomas Petazzoni wrote: > On Wed, 04 May 2011 16:52:08 -0400 > Matias Garcia wrote: > >> I'm building an OS for a PowerPC e500v2 core. Originally, I used a >> stock buildroot toolchain (uclibc), but was not able to optimize a >> time-critical section of our application. With the CodeSourcery >> compiler, I am. Unfortunately, even setting -te500v2 in the buildroot >> optimizations (and hacking it into the TARGET_LDFLAGS) doesn't fix >> all cases. Certain packages within buildroot seem to link against the >> wrong library (linker complains that one library is compiled with >> hard-float and another with soft-float, etc). Is there a way to tell >> buildroot (or Make in general) to always link against a certain >> library set? > We have to make sure that this -te500v2 flag is passed to all packages > during their build process. Which packages are causing problems > exactly ? Among others, freetype, jpeg-8b, liblockfile, libsysfs, libusb, libusb-compat, liblzo, and imlib2 (which I've hacked into the build based on ImageMagick). Most often, the error is 'Warning: <...>/cr[blah].o uses hard float, <...>/blah uses soft float'. > Another solution is to try the recent proposal of Peter Korsgaard to > use a wrapper for external toolchain components, that would enforce the > use of selected compiler flags so that the selected sysroot would > always be correct. That would be magical. I'm testing Peter's patch right now with a tree updated to his commit removing CFLAGS (yesterday), but I've hit a snag. It looks to me like unless I define some variables to tell buildroot I want -mcpu=854[0|8] -mabi=spe -mspe -mhard-float -mgprs-float=double (if memory serves), the wrapper will assume I want generic powerpc, as the target optimizations don't seem to be passed in. I'd even prefer to tell the compiler that I want -te500v2 instead since it's a handy-dandy shortcut that CodeSourcery provides for the above options, but I'll take what I can get. Any suggestions for a simple solution? I've defined an e500 option under target arch before, but I'd rather avoid that if possible. Thanks, Matias > Thomas