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authorGravatar Thomas Petazzoni <thomas.petazzoni@free-electrons.com>2016-01-25 00:07:51 +0100
committerGravatar Thomas Petazzoni <thomas.petazzoni@free-electrons.com>2016-01-26 21:26:08 +0100
commit9f99ec21e51e4a9a47d7383dcd7391d2a9aa5050 (patch)
tree0e0b5ecc84cb0a1669d65a5413ea5e85e0f4b251 /package/beecrypt
parent1e1333fd8f1aa53b90f28187ad811f32bb0e79f4 (diff)
downloadbuildroot-9f99ec21e51e4a9a47d7383dcd7391d2a9aa5050.tar.gz
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icu: remove BR2_ARCH_HAS_ATOMICS dependency
The BR2_ARCH_HAS_ATOMICS was added because on ARC, atomic instructions may not be provided by the architecture and therefore the compiler does not provide the __sync_*() built-ins. However, since then, icu was changed and is now able to use C++11 atomics, or even no atomic operations at all. In fact, icu will: * If possible, it will use C++11 atomics, which internally rely on the __atomic built-ins. These are available since gcc 4.7, and all architectures provide it. On some architectures, you *must* link with libatomic, on some other architectures, they are available built-in, but in all cases, linking against libatomic does not harm. Thanks to this, even ARC with no atomic support (which was the original reason for adding the BR2_ARCH_HAS_ATOMICS) dependency builds fine, provided -latomic is added to LIBS. * If C++11 atomics are not available, then it falls back to __sync_*() built-ins, which allows compilers older than 4.7 to be supported. * If really no atomic mechanism is available, then it falls back to a basic implementation based on a mutex. Conclusion: - The BR2_ARCH_HAS_ATOMICS dependency is no longer needed. - We need to link with -latomic when gcc >= 4.7 is used. Note that reverse dependencies of icu are also changed accordingly. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Diffstat (limited to 'package/beecrypt')
-rw-r--r--package/beecrypt/Config.in2
1 files changed, 0 insertions, 2 deletions
diff --git a/package/beecrypt/Config.in b/package/beecrypt/Config.in
index fc93a77605..069f3d5cfd 100644
--- a/package/beecrypt/Config.in
+++ b/package/beecrypt/Config.in
@@ -16,7 +16,6 @@ config BR2_PACKAGE_BEECRYPT_CPP
depends on BR2_INSTALL_LIBSTDCPP
depends on BR2_USE_WCHAR # icu
depends on !BR2_BINFMT_FLAT # icu
- depends on BR2_ARCH_HAS_ATOMICS # icu
depends on !BR2_STATIC_LIBS
select BR2_PACKAGE_ICU
help
@@ -24,7 +23,6 @@ config BR2_PACKAGE_BEECRYPT_CPP
comment "C++ support needs a toolchain w/ C++, wchar, dynamic libraries"
depends on !BR2_BINFMT_FLAT
- depends on BR2_ARCH_HAS_ATOMICS
depends on !BR2_INSTALL_LIBSTDCPP || !BR2_USE_WCHAR \
|| BR2_STATIC_LIBS