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51 lines
2.1 KiB
C++
51 lines
2.1 KiB
C++
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/// In glibc 2.32 new version of some symbols had been added [1]:
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///
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/// $ nm -D clickhouse | fgrep -e @GLIBC_2.32
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/// U pthread_getattr_np@GLIBC_2.32
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/// U pthread_sigmask@GLIBC_2.32
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///
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/// [1]: https://www.spinics.net/lists/fedora-devel/msg273044.html
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///
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/// Right now ubuntu 20.04 is used as official image for building
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/// ClickHouse, however once it will be switched someone may not be happy
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/// with that fact that he/she cannot use official binaries anymore because
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/// they have glibc < 2.32.
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///
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/// To avoid this dependency, let's force previous version of those
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/// symbols from glibc.
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///
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/// Also note, that the following approach had been tested:
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/// a) -Wl,--wrap -- but it goes into endless recursion whey you try to do
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/// something like this:
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///
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/// int __pthread_getattr_np_compact(pthread_t thread, pthread_attr_t *attr);
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/// GLIBC_COMPAT_SYMBOL(__pthread_getattr_np_compact, pthread_getattr_np)
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/// int __pthread_getattr_np_compact(pthread_t thread, pthread_attr_t *attr);
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/// int __wrap_pthread_getattr_np(pthread_t thread, pthread_attr_t *attr)
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/// {
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/// return __pthread_getattr_np_compact(thread, attr);
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/// }
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///
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/// int __pthread_sigmask_compact(int how, const sigset_t *set, sigset_t *oldset);
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/// GLIBC_COMPAT_SYMBOL(__pthread_sigmask_compact, pthread_sigmask)
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/// int __pthread_sigmask_compact(int how, const sigset_t *set, sigset_t *oldset);
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/// int __wrap_pthread_sigmask(int how, const sigset_t *set, sigset_t *oldset)
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/// {
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/// return __pthread_sigmask_compact(how, set, oldset);
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/// }
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///
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/// b) -Wl,--defsym -- same problems (and you cannot use version of symbol with
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/// version in the expression)
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/// c) this approach -- simply add this file with -include directive.
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#if defined(__amd64__)
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#define GLIBC_COMPAT_SYMBOL(func) __asm__(".symver " #func "," #func "@GLIBC_2.2.5");
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#elif defined(__aarch64__)
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#define GLIBC_COMPAT_SYMBOL(func) __asm__(".symver " #func "," #func "@GLIBC_2.17");
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#else
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#error Your platform is not supported.
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#endif
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GLIBC_COMPAT_SYMBOL(pthread_sigmask)
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GLIBC_COMPAT_SYMBOL(pthread_getattr_np)
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