# libunwind is only available for a certain subset of the
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# architectures (as visible in the list of architectures supported
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# with the glibc C library below).
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#
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# In addition to this, on some architectures libunwind requires the
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# *context() function from the C library, which are only available on
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# certain architectures in uClibc, and not available at all on
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# musl. But on some other architectures, libunwind works without using
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# the *context() functions, which allows it to be built with musl.
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config BR2_PACKAGE_LIBUNWIND_ARCH_SUPPORTS
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bool
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default y if BR2_TOOLCHAIN_USES_GLIBC && \
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(BR2_ARM_CPU_HAS_ARM || BR2_aarch64 || BR2_mips || BR2_mipsel || \
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BR2_mips64 || BR2_mips64el || BR2_powerpc || BR2_sh || \
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BR2_i386 || BR2_x86_64)
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default y if BR2_TOOLCHAIN_USES_UCLIBC && \
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(BR2_ARM_CPU_HAS_ARM || BR2_mips || BR2_mipsel || \
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BR2_mips64 || BR2_mips64el || BR2_x86_64)
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default y if BR2_TOOLCHAIN_USES_MUSL && \
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(BR2_ARM_CPU_HAS_ARM || BR2_aarch64 || BR2_x86_64)
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config BR2_PACKAGE_LIBUNWIND
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bool "libunwind"
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depends on BR2_TOOLCHAIN_HAS_THREADS
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depends on BR2_PACKAGE_LIBUNWIND_ARCH_SUPPORTS
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# forcefully links against libgcc_s, only available in dynamic
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# linking configurations
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depends on !BR2_STATIC_LIBS
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help
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C API to determine the call-chain of a program.
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http://www.nongnu.org/libunwind/index.html
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comment "libunwind needs a toolchain w/ threads, dynamic library"
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depends on BR2_PACKAGE_LIBUNWIND_ARCH_SUPPORTS
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depends on !BR2_TOOLCHAIN_HAS_THREADS || BR2_STATIC_LIBS
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