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toolchain: add BR2_TOOLCHAIN_SUPPORTS_ALWAYS_LOCKFREE_ATOMIC_INTS hidden option

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Add BR2_TOOLCHAIN_SUPPORTS_ALWAYS_LOCKFREE_ATOMIC_INTS variable and
use it in BR2_TOOLCHAIN_HAS_GCC_BUG_64735.

This new variable will be used to select boost atomic when lock-free
atomic ints are not available

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
This commit is contained in:
Fabrice Fontaine 2018-08-18 00:10:13 +02:00 committed by Thomas Petazzoni
parent 6d37231476
commit 5f6f910cc9
1 changed files with 27 additions and 10 deletions
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37
toolchain/Config.in
View File

@ -69,18 +69,35 @@ comment "Toolchain Generic Options"
config BR2_TOOLCHAIN_HAS_BINUTILS_BUG_19615
bool
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64735
# exception_ptr, nested_exception, and future from libstdc++ are not
# available for architectures not supporting always lock-free atomic
# ints before GCC 7
# Atomic types can be:
# - never lock-free
# - sometimes lock-free
# - always lock-free
# see https://en.cppreference.com/w/c/atomic/ATOMIC_LOCK_FREE_consts
#
# On most architectures, gcc provides "always lock-free" atomic types,
# but a few architectures are limited to "sometimes lock-free"
# types. This hidden option allows to know if the architecture
# provides "always lock-free" atomic types.
config BR2_TOOLCHAIN_SUPPORTS_ALWAYS_LOCKFREE_ATOMIC_INTS
bool
default y
depends on !BR2_nios2
depends on !BR2_ARM_CPU_ARMV4
depends on !BR2_ARM_CPU_ARMV5
depends on !BR2_sparc_v8
depends on !BR2_m68k_cf5208
# Prior to gcc 7.x, exception_ptr, nested_exception and future from
# libstdc++ would only be provided on architectures that support
# always lock-free atomic ints. See
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64735. This issue has
# been removed in GCC 7.x, where exception propagation is now
# supported without lock-free atomic int.
config BR2_TOOLCHAIN_HAS_GCC_BUG_64735
bool
default y if BR2_nios2
default y if BR2_ARM_CPU_ARMV4
default y if BR2_ARM_CPU_ARMV5
default y if BR2_sparc_v8
default y if BR2_m68k_cf5208
depends on !BR2_TOOLCHAIN_GCC_AT_LEAST_7
default y if !BR2_TOOLCHAIN_SUPPORTS_ALWAYS_LOCKFREE_ATOMIC_INTS && \
!BR2_TOOLCHAIN_GCC_AT_LEAST_7
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85180. This bug no
# longer exists in gcc 8.x.