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Updated comment about QNX workaround in uncaught_exceptions.hpp.

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This commit is contained in:
Andrey Semashev
2019-06-18 12:48:18 +03:00
parent 420dff80b5
commit 7e1d028958
1 changed files with 4 additions and 2 deletions
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6
include/boost/core/uncaught_exceptions.hpp
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@ -56,8 +56,10 @@
// On Linux with clang and libc++ and on OS X, there is a version of cxxabi.h from libc++abi that doesn't declare __cxa_get_globals, but provides __cxa_uncaught_exceptions. // On Linux with clang and libc++ and on OS X, there is a version of cxxabi.h from libc++abi that doesn't declare __cxa_get_globals, but provides __cxa_uncaught_exceptions.
// The function only appeared in version _LIBCPPABI_VERSION >= 1002 of the library. Unfortunately, there are linking errors about undefined reference to __cxa_uncaught_exceptions // The function only appeared in version _LIBCPPABI_VERSION >= 1002 of the library. Unfortunately, there are linking errors about undefined reference to __cxa_uncaught_exceptions
// on Ubuntu Trusty and OS X, so we avoid using it and forward-declare __cxa_get_globals instead. // on Ubuntu Trusty and OS X, so we avoid using it and forward-declare __cxa_get_globals instead.
// On QNX SDP 7.0 (QCC 5.4.0), there are multiple cxxabi.h, one from glibcxx from gcc and another from libc++abi from LLVM. The latter is included first by qcc. It is missing // On QNX SDP 7.0 (QCC 5.4.0), there are multiple cxxabi.h, one from glibcxx from gcc and another from libc++abi from LLVM. Which one is included will be determined by the qcc
// the declaration of __cxa_get_globals but it is also patched by QNX developers to not define _LIBCPPABI_VERSION. https://github.com/boostorg/core/issues/59 // command line arguments (-V and/or -Y; http://www.qnx.com/developers/docs/7.0.0/#com.qnx.doc.neutrino.utilities/topic/q/qcc.html). The LLVM libc++abi is missing the declaration
// of __cxa_get_globals but it is also patched by QNX developers to not define _LIBCPPABI_VERSION. Older QNX SDP versions, up to and including 6.6, don't provide LLVM and libc++abi.
// See https://github.com/boostorg/core/issues/59.
#if !defined(__FreeBSD__) && \ #if !defined(__FreeBSD__) && \
( \ ( \
(defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__) < 407) || \ (defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__) < 407) || \