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- ################################################################################
- #
- # toolchain
- #
- ################################################################################
- ifeq ($(BR2_TOOLCHAIN_BUILDROOT),y)
- TOOLCHAIN_DEPENDENCIES += toolchain-buildroot
- else ifeq ($(BR2_TOOLCHAIN_EXTERNAL),y)
- TOOLCHAIN_DEPENDENCIES += toolchain-external
- endif
- TOOLCHAIN_ADD_TOOLCHAIN_DEPENDENCY = NO
- TOOLCHAIN_INSTALL_STAGING = YES
- # Apply a hack that Rick Felker suggested[1] to avoid conflicts between libc
- # headers and kernel headers. This is needed for kernel headers older than
- # 4.15. Kernel headers 4.15 and newer don't require __GLIBC__ to be defined.
- #
- # Augment the original suggestion with __USE_MISC since recent kernels
- # (older than 4.15) require this glibc internal macro. Also, as musl defines
- # IFF_LOWER_UP, IFF_DORMANT and IFF_ECHO, add another macro to suppress
- # them in the kernel header, and avoid macro/enum conflict.
- #
- # Kernel version 3.12 introduced the libc-compat.h header.
- #
- # [1] http://www.openwall.com/lists/musl/2015/10/08/2
- ifeq ($(BR2_TOOLCHAIN_USES_MUSL)$(BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_12):$(BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_15),yy:)
- define TOOLCHAIN_MUSL_KERNEL_HEADERS_COMPATIBILITY_HACK
- $(SED) 's/^#if defined(__GLIBC__)$$/#if 1/' \
- $(STAGING_DIR)/usr/include/linux/libc-compat.h
- $(SED) '1s/^/#define __USE_MISC\n/' \
- $(STAGING_DIR)/usr/include/linux/libc-compat.h
- $(SED) '1s/^/#define __UAPI_DEF_IF_NET_DEVICE_FLAGS_LOWER_UP_DORMANT_ECHO 0\n/' \
- $(STAGING_DIR)/usr/include/linux/libc-compat.h
- endef
- TOOLCHAIN_POST_INSTALL_STAGING_HOOKS += TOOLCHAIN_MUSL_KERNEL_HEADERS_COMPATIBILITY_HACK
- endif
- # Install default nsswitch.conf file if the skeleton doesn't provide it
- ifeq ($(BR2_TOOLCHAIN_USES_GLIBC),y)
- define GLIBC_COPY_NSSWITCH_FILE
- @if [ ! -f "$(TARGET_DIR)/etc/nsswitch.conf" ]; then \
- $(INSTALL) -D -m 0644 package/glibc/nsswitch.conf $(TARGET_DIR)/etc/nsswitch.conf ; \
- fi
- endef
- TOOLCHAIN_POST_INSTALL_TARGET_HOOKS += GLIBC_COPY_NSSWITCH_FILE
- endif
- $(eval $(virtual-package))
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