6f29cdeee4
Buildroot would automatically enable multithreading in OpenBLAS if the
architecture supports it. However, one may want to avoid OpenBLAS creating
threads itself and configure single-threaded operation. To accommodate this
use case, add a config option for multithreading.
When multithreading is disabled but OpenBLAS functions are called in the
same application by multiple threads, then locking is mandatory. The
USE_LOCKING flag was added in version 0.3.7 with following release note:
a new option USE_LOCKING was added to ensure thread safety when OpenBLAS
itself is built without multithreading but will be called from multiple
threads.
However, if one knows that OpenBLAS will only be called from single-threaded
applications, then passing USE_LOCKING is not necessary, so make it a config
option too.
When multithreading is enabled, locking is implicitly enabled inside
openblas, so only provide the locking option when multithreading is
disabled.
Signed-off-by: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
80 lines
2.3 KiB
Makefile
80 lines
2.3 KiB
Makefile
################################################################################
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#
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# openblas
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#
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################################################################################
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OPENBLAS_VERSION = 0.3.9
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OPENBLAS_SITE = $(call github,xianyi,OpenBLAS,v$(OPENBLAS_VERSION))
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OPENBLAS_LICENSE = BSD-3-Clause
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OPENBLAS_LICENSE_FILES = LICENSE
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OPENBLAS_INSTALL_STAGING = YES
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# Initialise OpenBLAS make options to $(TARGET_CONFIGURE_OPTS)
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OPENBLAS_MAKE_OPTS = $(TARGET_CONFIGURE_OPTS)
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# Enable cross-compiling
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OPENBLAS_MAKE_OPTS += CROSS=1
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# Set OpenBLAS target
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OPENBLAS_MAKE_OPTS += TARGET=$(BR2_PACKAGE_OPENBLAS_TARGET)
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# When Fortran is not available, only build the C version of BLAS
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ifeq ($(BR2_TOOLCHAIN_HAS_FORTRAN),)
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OPENBLAS_MAKE_OPTS += ONLY_CBLAS=1
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endif
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# Enable/Disable multi-threading (not for static-only since it uses dlfcn.h)
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ifeq ($(BR2_PACKAGE_OPENBLAS_USE_THREAD),y)
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OPENBLAS_MAKE_OPTS += USE_THREAD=1
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else
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OPENBLAS_MAKE_OPTS += USE_THREAD=0
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endif
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ifeq ($(BR2_PACKAGE_OPENBLAS_USE_LOCKING),y)
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OPENBLAS_MAKE_OPTS += USE_LOCKING=1
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else
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# not passing USE_LOCKING=0 as this could be confusing: its effect is implicit
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# in case of USE_THREAD=1.
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endif
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# We don't know if OpenMP is available or not, so disable
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OPENBLAS_MAKE_OPTS += USE_OPENMP=0
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# Static-only/Shared-only toggle
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ifeq ($(BR2_STATIC_LIBS),y)
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OPENBLAS_MAKE_OPTS += NO_SHARED=1
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else ifeq ($(BR2_SHARED_LIBS),y)
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OPENBLAS_MAKE_OPTS += NO_STATIC=1
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endif
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# binutils version <= 2.23.2 has a bug
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# (https://sourceware.org/bugzilla/show_bug.cgi?id=14887) where
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# whitespaces in ARM register specifications such as [ r1, #12 ] or [
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# r2 ] cause the assembler to reject the code. Since there are
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# numerous instances of such cases in the code, we use sed rather than
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# a patch. We simply replace [ foobar ] by [foobar] to work around the
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# problem.
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define OPENBLAS_FIXUP_ARM_ASSEMBLY
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$(SED) 's%\[\s*%\[%;s%\s*\]%\]%' $(@D)/kernel/arm/*.S
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endef
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OPENBLAS_POST_PATCH_HOOKS += OPENBLAS_FIXUP_ARM_ASSEMBLY
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define OPENBLAS_BUILD_CMDS
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$(TARGET_MAKE_ENV) $(MAKE) $(OPENBLAS_MAKE_OPTS) \
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-C $(@D)
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endef
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define OPENBLAS_INSTALL_STAGING_CMDS
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$(TARGET_MAKE_ENV) $(MAKE) $(OPENBLAS_MAKE_OPTS) \
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-C $(@D) install PREFIX=$(STAGING_DIR)/usr
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endef
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define OPENBLAS_INSTALL_TARGET_CMDS
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$(TARGET_MAKE_ENV) $(MAKE) $(OPENBLAS_MAKE_OPTS) \
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-C $(@D) install PREFIX=$(TARGET_DIR)/usr
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endef
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$(eval $(generic-package))
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