mirror of
https://git.busybox.net/buildroot.git
synced 2024-12-04 10:53:30 +08:00
9f99ec21e5
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>
30 lines
768 B
Plaintext
30 lines
768 B
Plaintext
comment "beecrypt needs a toolchain w/ threads"
|
|
depends on !BR2_TOOLCHAIN_HAS_THREADS
|
|
|
|
config BR2_PACKAGE_BEECRYPT
|
|
bool "beecrypt"
|
|
depends on BR2_TOOLCHAIN_HAS_THREADS
|
|
help
|
|
Beecrypt is a general-purpose cryptography library.
|
|
|
|
http://beecrypt.sf.net
|
|
|
|
if BR2_PACKAGE_BEECRYPT
|
|
|
|
config BR2_PACKAGE_BEECRYPT_CPP
|
|
bool "C++ support"
|
|
depends on BR2_INSTALL_LIBSTDCPP
|
|
depends on BR2_USE_WCHAR # icu
|
|
depends on !BR2_BINFMT_FLAT # icu
|
|
depends on !BR2_STATIC_LIBS
|
|
select BR2_PACKAGE_ICU
|
|
help
|
|
Enable C++ support. This pulls in the (large) icu package.
|
|
|
|
comment "C++ support needs a toolchain w/ C++, wchar, dynamic libraries"
|
|
depends on !BR2_BINFMT_FLAT
|
|
depends on !BR2_INSTALL_LIBSTDCPP || !BR2_USE_WCHAR \
|
|
|| BR2_STATIC_LIBS
|
|
|
|
endif # BR2_PACKAGE_BEECRYPT
|