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8d3e126e83
Eventhough it should be theoretically possible to build protobuf in
static-only, configure.ac includes an m4 macro, ACX_PTHREAD defined in
m4/acx_pthread.m4, which forcibly checks for threads *with* shared libs,
and is completely broken for static-only (as it forces -shared whatever
the user selection), ending up with these configure results:
checking for the pthreads library -lpthreads... no
checking whether pthreads work without any flags... no
checking whether pthreads work with -Kthread... no
checking whether pthreads work with -kthread... no
checking for the pthreads library -llthread... no
checking whether pthreads work with -pthread... yes
checking for joinable pthread attribute... PTHREAD_CREATE_JOINABLE
checking if more special flags are required for pthreads... no
checking whether to check for GCC pthread/shared inconsistencies... yes
checking whether -pthread is sufficient with -shared... no
checking whether -lpthread fixes that... no
checking whether -lc_r fixes that... no
configure: WARNING: Impossible to determine how to use pthreads with shared libraries
checking whether what we have so far is sufficient with -nostdlib... no
checking whether -lpthread saves the day... no
configure: WARNING: Impossible to determine how to use pthreads with shared libraries and -nostdlib
Fixing this macro is far from trivial; protobuf in a static-only
scenario is probably not too common. So, just disable protobuf for
static-only builds.
Fixes:
http://autobuild.buildroot.org/results/3ef/3efb86c7e8ec2db5d953d634470cafae79bd34cf/
http://autobuild.buildroot.org/results/96a/96ae1108fc3193df2a93a779057130b774379655/
http://autobuild.buildroot.org/results/00c/00c29795980319d38823eec1301e9ebd860ebd2a/
...
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Nimai Mahajan <nimaim@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
22 lines
888 B
Plaintext
22 lines
888 B
Plaintext
config BR2_PACKAGE_PROTOBUF
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bool "protobuf"
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depends on BR2_INSTALL_LIBSTDCPP
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depends on BR2_TOOLCHAIN_HAS_THREADS
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# See src/google/protobuf/stubs/platform_macros.h for supported archs.
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# PowerPC doesn't actually work.
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depends on BR2_arm || BR2_i386 || BR2_mipsel || BR2_x86_64
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# host-protobuf only builds on certain architectures
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depends on BR2_HOSTARCH = "x86_64" || BR2_HOSTARCH = "x86"
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depends on !BR2_STATIC_LIBS
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help
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Protocol buffers are Google's language-neutral, platform-neutral,
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extensible mechanism for serializing structured data.
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https://developers.google.com/protocol-buffers
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comment "protobuf needs a toolchain w/ C++, threads, dynamic library"
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depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_HAS_THREADS \
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|| BR2_STATIC_LIBS
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depends on BR2_arm || BR2_i386 || BR2_mipsel || BR2_x86_64
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depends on BR2_HOSTARCH = "x86_64" || BR2_HOSTARCH = "x86"
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