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Hi Yann, On Thursday 15 November 2012 10:18:30 Yann E. MORIN wrote: > Jeremy, All, > > On Thursday 15 November 2012 09:53:16 Jeremy Rosen wrote: > > for some time I was having trouble compiling crosstool-ng using buildroot > > on my machine, > > > > it typically failed while building ppl with the type of error below > > > > [ERROR] /home/rosen/projets/mini2440/buildroot/output/build/build- > > toolchain/.build/src/ppl-0.10.2/src/Interval.defs.hh:432:5: error: > > 'f_info' was not declared in this scope, and no declarations were > > found by argument-dependent lookup at the point of instantiation > > [-fpermissive] > > > after some investigation (thx a lot to kos_tom on IRC) this error only > > happens when compiling with gcc 4.7 on the host machine. > > > > the workaround (described at http://comments.gmane.org/gmane.comp. > > gcc.cross-compiling/14909) is to add the -fpermissive flag to the host > > compiler via the crosstool-ng compile option > > > I am sending this email for two reasons > > 2) to ask how to write a workaround, or a way for crosstool-ng to detect > > the problem. I was compiling the default gcc version from my buildroot > > defconfig (which is 4.4.6) but trying with gcc 4.6 (latest version > > available in ctng afaict) did not solve the problem... > > That's because it is not the cross-compiler that is at /fault/ here, but > the compiler on your host. So, switching to another version in crosstool-NG > will not solve the issue. > > > if anybody has an idea how to do an upstreamable patch, i would gladly > > write it... > > In scripts/build/companion_libs/ppl.sh: > - look for calls to ppl_do_backend (hint: two call sites) > - just before those calls, add a line like: > ppl_opts+=( "cflags=-fpermissive" ) > - warning: there's already a call site that sets cflags ;-) > > This will unconditionally add the -fpermissive CFLAG when building ppl. > I am not sure it is worth doing it conditionally on the gcc version. You could probably do it based on a specific PPL version at least, so that whenever the upstream version receives the proper fix, it does no longer need to be enabled. -- Florian -- For unsubscribe information see http://sourceware.org/lists.html#faq
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