60aee0cc5a
libunwind use sigreturn() and setcontext() while building for x86 [1]
but this function is not available with musl [2].
This throw a warning during libunwind build:
In file included from x86/Los-linux.c:4:0:
x86/Gos-linux.c: In function ‘_ULx86_local_resume’:
x86/Gos-linux.c:298:7: warning: implicit declaration of function ‘sigreturn’ [-Wimplicit-function-declaration]
sigreturn (sc);
^
But any program trying to link against libunwind-generic.so or
libunwind.so fail to build:
[...]/usr/lib/libunwind-generic.so: undefined reference to `sigreturn'
[...]/usr/lib/libunwind-generic.so: undefined reference to `setcontext'
collect2: error: ld returned 1 exit status
Disable libunwind for x86 target when musl is used.
Reported upstream by Waldemar [3]
[1] http://git.savannah.gnu.org/gitweb/?p=libunwind.git;a=blob;f=src/x86/Gos-linux.c;h=17aebc2974af50eb0bf8292689b2ed22a4c97866;hb=HEAD#l299
[2] http://openwall.com/lists/musl/2016/02/04/3
[3] http://lists.nongnu.org/archive/html/libunwind-devel/2017-04/msg00030.html
Signed-off-by: Romain Naour <romain.naour@gmail.com>
Cc: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Waldemar Brodkorb <wbx@openadk.org>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
33 lines
1.3 KiB
Plaintext
33 lines
1.3 KiB
Plaintext
# 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_mips || BR2_mipsel || BR2_mips64 || \
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BR2_mips64el || BR2_powerpc || BR2_sh || 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_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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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"
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depends on BR2_PACKAGE_LIBUNWIND_ARCH_SUPPORTS
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depends on !BR2_TOOLCHAIN_HAS_THREADS
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