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authorGravatar Fabrice Fontaine <fontaine.fabrice@gmail.com>2018-08-18 00:10:13 +0200
committerGravatar Thomas Petazzoni <thomas.petazzoni@bootlin.com>2018-08-18 14:32:07 +0200
commit5f6f910cc9978910ebab5e088cb7c3870371b382 (patch)
tree1e98eedcec6d1e73b2d707e369a25184bfb34ac9 /toolchain
parent6d3723147659542ec1cba4139981d75413d89edc (diff)
downloadbuildroot-5f6f910cc9978910ebab5e088cb7c3870371b382.tar.gz
buildroot-5f6f910cc9978910ebab5e088cb7c3870371b382.tar.bz2
toolchain: add BR2_TOOLCHAIN_SUPPORTS_ALWAYS_LOCKFREE_ATOMIC_INTS hidden option
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>
Diffstat (limited to 'toolchain')
-rw-r--r--toolchain/Config.in37
1 files changed, 27 insertions, 10 deletions
diff --git a/toolchain/Config.in b/toolchain/Config.in
index 3a53a32a6d..ad02af5215 100644
--- a/toolchain/Config.in
+++ b/toolchain/Config.in
@@ -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.