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>
49 lines
1.3 KiB
Makefile
49 lines
1.3 KiB
Makefile
################################################################################
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#
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# icu
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#
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################################################################################
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ICU_VERSION = 56.1
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ICU_SOURCE = icu4c-$(subst .,_,$(ICU_VERSION))-src.tgz
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ICU_SITE = http://download.icu-project.org/files/icu4c/$(ICU_VERSION)
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ICU_LICENSE = ICU License
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ICU_LICENSE_FILES = license.html
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ICU_DEPENDENCIES = host-icu
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ICU_INSTALL_STAGING = YES
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ICU_CONFIG_SCRIPTS = icu-config
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ICU_CONF_OPTS = \
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--with-cross-build=$(HOST_ICU_DIR)/source \
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--disable-samples \
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--disable-tests
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# With gcc >= 4.7, icu prefers to use C++11 atomics, which rely on the
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# __atomic builtins. On certain architectures, this requires linking
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# with libatomic.
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ifeq ($(BR2_TOOLCHAIN_GCC_AT_LEAST_4_7),y)
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ICU_CONF_ENV += LIBS="-latomic"
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endif
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HOST_ICU_CONF_OPTS = \
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--disable-samples \
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--disable-tests \
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--disable-extras \
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--disable-icuio \
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--disable-layout \
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--disable-renaming
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ICU_SUBDIR = source
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HOST_ICU_SUBDIR = source
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ICU_CUSTOM_DATA_PATH = $(call qstrip,$(BR2_PACKAGE_ICU_CUSTOM_DATA_PATH))
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ifneq ($(ICU_CUSTOM_DATA_PATH),)
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define ICU_COPY_CUSTOM_DATA
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cp $(ICU_CUSTOM_DATA_PATH) $(@D)/source/data/in/
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endef
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ICU_POST_PATCH_HOOKS += ICU_COPY_CUSTOM_DATA
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endif
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$(eval $(autotools-package))
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$(eval $(host-autotools-package))
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