kumquat-buildroot/package/lttng-libust/Config.in
Samuel Martin a1a86ebfba liburcu: disable build with gcc-4.8.x on ARM
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>
2014-03-23 23:17:56 +01:00

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config BR2_PACKAGE_LTTNG_LIBUST
bool "lttng-libust"
select BR2_PACKAGE_LIBURCU
select BR2_PACKAGE_UTIL_LINUX
select BR2_PACKAGE_UTIL_LINUX_LIBUUID
# util-linux needs wchar and largefile
depends on BR2_USE_WCHAR
depends on BR2_LARGEFILE
# liburcu only works on some architectures and requires threads support"
depends on BR2_arm || BR2_armeb || BR2_i386 || BR2_powerpc || BR2_x86_64
depends on !BR2_TOOLCHAIN_HAS_GCC_BUG_58854 # liburcu/gcc-4.8.x bug
depends on BR2_TOOLCHAIN_HAS_THREADS
help
Userspace tracing library for the Lttng tracing
infrastructure. It allows userspace programs to create
custom trace events that are integrated with all other
events gathered by LTTng.
http://lttng.org
comment "lttng-libust needs a toolchain w/ wchar, largefile, threads"
depends on BR2_arm || BR2_armeb || BR2_i386 || BR2_powerpc || BR2_x86_64
depends on !BR2_USE_WCHAR || !BR2_LARGEFILE || !BR2_TOOLCHAIN_HAS_THREADS
depends on !BR2_TOOLCHAIN_HAS_GCC_BUG_58854 # liburcu/gcc-4.8.x bug
comment "lttng-libust needs a toolchain not affected by GCC bug 58854"
depends on BR2_TOOLCHAIN_HAS_GCC_BUG_58854