TOOLCHAIN_OPTIONS
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TOOLCHAIN_OPTIONS is used to set the sysroot location for target builds see cmake.bbclass:
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OECMAKE_C_FLAGS ?= "${HOST_CC_ARCH} ${TOOLCHAIN_OPTIONS} ${CFLAGS}"
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OECMAKE_CXX_FLAGS ?= "${HOST_CC_ARCH} ${TOOLCHAIN_OPTIONS} ${CXXFLAGS}"
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OECMAKE_C_FLAGS_RELEASE ?= "${SELECTED_OPTIMIZATION} ${CFLAGS} -DNDEBUG"
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OECMAKE_CXX_FLAGS_RELEASE ?= "${SELECTED_OPTIMIZATION} ${CXXFLAGS} -DNDEBUG"
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OECMAKE_C_LINK_FLAGS ?= "${HOST_CC_ARCH} ${TOOLCHAIN_OPTIONS} ${CPPFLAGS} ${LDFLAGS}"
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OECMAKE_CXX_LINK_FLAGS ?= "${HOST_CC_ARCH} ${TOOLCHAIN_OPTIONS} ${CXXFLAGS} ${LDFLAGS}" TOOLCHAIN_OPTIONS default value is set in bitbake.conf and in addition may be replaced in other places:
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bitbake.conf: TOOLCHAIN_OPTIONS = " --sysroot=${STAGING_DIR_TARGET}"
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native.bbclass: TOOLCHAIN_OPTIONS = ""
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glibc-initial.inc: TOOLCHAIN_OPTIONS = " --sysroot=${STAGING_DIR_TCBOOTSTRAP}"
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glibc.inc: TOOLCHAIN_OPTIONS = " --sysroot=${STAGING_DIR_TCBOOTSTRAP}"
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uclibc.inc: TOOLCHAIN_OPTIONS = " --sysroot=${STAGING_DIR_TCBOOTSTRAP}"
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cross.bbclass: TOOLCHAIN_OPTIONS = ""
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cross-canadian.bbclass: TOOLCHAIN_OPTIONS = " --sysroot=${STAGING_DIR}/${HOST_ARCH}-${SDKPKGSUFFIX}${HOST_VENDOR}-${HOST_OS}"
STAGING_DIR_TARGET default is defined in bitbake.conf but may be altered in other places (see STAGING_DIR_TARGET)