a1a86ebfba
Because of a gcc bug [1], liburcu checks for compiler version [2] and stops the build prematurely if gcc-4.8.[0-2] is detected for ARM. However a bug fix exists [3] and may be backported by ARM toolchain providers; that's what is done in Buildroot [4] or Linaro [5]. So, this change: - add a patch in liburcu to allow build with ARM gcc-4.8.2; - adds a new hidden symbol to reflect the toolchain status with regard to this bug [1]; - and controls liburcu visibility. However, a limitation of this is when the user is using a custom toolchain; that's why the bug details have been added in the liburcu help message. [1] http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58854 [2] http://git.lttng.org/?p=userspace-rcu.git;a=commitdiff;h=4b79310 [3] http://gcc.gnu.org/viewcvs/gcc?view=revision&revision=204665 [4] http://git.buildroot.net/buildroot/commit/?id=c443c2be1768ebbdcb76c55d0a08fd7c983488c8 [5] http://bazaar.launchpad.net/~linaro-toolchain-dev/gcc-linaro/4.8/revision/122147 [Peter: hide normal toolchain comment if bug, add comment explaining issue if bug] Signed-off-by: Samuel Martin <s.martin49@gmail.com> Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
27 lines
1.0 KiB
Plaintext
27 lines
1.0 KiB
Plaintext
config BR2_PACKAGE_LIBURCU
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bool "liburcu"
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depends on BR2_arm || BR2_armeb || BR2_i386 || BR2_powerpc || BR2_x86_64
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depends on !BR2_TOOLCHAIN_HAS_GCC_BUG_58854 # liburcu/gcc-4.8.x bug
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depends on BR2_TOOLCHAIN_HAS_THREADS
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help
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Userspace implementation of the Read-Copy-Update (RCU)
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synchronization mechanism. This library is mainly used by
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the LTTng tracing infrastructure, but can be used for other
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purposes as well.
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On ARM, because of bug:
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58854
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liburcu cannot be built using gcc 4.8.0, 4.8.1 or 4.8.2 without the
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following bug fix:
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http://gcc.gnu.org/viewcvs/gcc?view=revision&revision=204665
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http://lttng.org/urcu
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comment "liburcu needs a toolchain w/ threads"
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depends on BR2_arm || BR2_armeb || BR2_i386 || BR2_powerpc || BR2_x86_64
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depends on !BR2_TOOLCHAIN_HAS_GCC_BUG_58854 # liburcu/gcc-4.8.x bug
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depends on !BR2_TOOLCHAIN_HAS_THREADS
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comment "liburcu needs a toolchain not affected by GCC bug 58854"
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depends on BR2_TOOLCHAIN_HAS_GCC_BUG_58854
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