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* package/erlang: fix detection of libatomic_opsGravatar Yann E. MORIN2015-01-041-0/+13
For some platforms, hardware-assisted compare-and-swap may not be available, so libatomic_ops will not provide it. However, libatomic_ops can provide a purely software CAS emulation, but must be instructed to do so. erlang just forgot to tell libatomic_ops that it does require CAS. Fix that by defining AO_REQUIRE_CAS before including atmoic_ops.h, like is done in libunwind, as pointed out by Thomas. Also, erlang has a convoluted, mind-alterating set on aclocal.m4 macros, that just forgets to link against -latomic_ops when checking CAS is available, so that even if CAS is available, configure chokes. Since I would like to keep the little sanity I still have, just force linking with -latomic_ops. This is useless when the check is natrally sucessful (i.e. on platforms where CAS is available in HW), but we would eventually link with -latomic_ops there, too; it's just redundant. Overall, just consider that erlang requires libatomic_ops, so forcibly depend on it, it is easier than trying to disable it. We can revisit that whenever someone wants to run erlang on a platform for which there is no libatomic_ops support. Fixes a slew of autobuild ARM failures: http://autobuild.buildroot.org/results/e7b/e7bfc4893dea6b133f0794ef44d50ad89bcb6662/ http://autobuild.buildroot.org/results/3e9/3e9c307f1ec6536482641019dcaa94677f7267a3/ http://autobuild.buildroot.org/results/a85/a85ca414e5b67af46510abd7b610eb5ae8661de4/ [...] [Thomas: fix minor typos in commit log, add dependency on BR2_PACKAGE_LIBATOMIC_ARCH_SUPPORTS to the Erlang comment about thread and shared library dependency.] Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr> Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Cc: Frank Hunleth <fhunleth@troodon-software.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>