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Chapter 5. Notable changes in RHEL 10

The following are important changes that occur in RHEL 10.

5.1. Compatibility breaking changes in C++

std::condition_variable::wait is now a thread cancellation point

In GCC 11 and earlier, the std::condition_variable::wait function was noexcept, which made it incompatible with thread cancellation. As a result, if a call to pthread_cancel cancelled a thread blocked in std::condition_variable::wait, the process would be terminated. In GCC 12 and later, std::condition_variable::wait can be cancelled by calls to the pthread_cancel function, which unwinds the stack. If you have code that depends on wait never throwing an exception, review the code and take appropriate action.

Deprecated class templates

Certain class templates have been deprecated in new versions of C++ and produce warning diagnostics in GCC 12 and later:

  • The following class templates have been deprecated in C++11 and later:

    • std::unary_function
    • std::binary_function
  • The std::iterator class template has been deprecated in C++17 and later.

To prevent the warning diagnostics, you can take one of the following actions:

  • When you do not want to make other changes to the code, silence the warning diagnostics by using GCC’s diagnostic pragmas. For example: 

    #pragma GCC diagnostic push
#pragma GCC diagnostic ignored “-Wdeprecated-declarations”
class Functor : public std::unary_function<int, int>
{ /* … */ };
#pragma GCC diagnostic pop
    Copy to Clipboard

  • When you want your code to be compatible with later versions of C++, replace these class templates in the code with nested typedefs. For example, you can replace a std::unary_function base class with result_type and argument_type typedefs: 

    class Functor
{
  using result_type = int;
  using argument_type = int;
  /* … */
};
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5.2. Compatibility breaking changes to glibc

Changes to how the dynamic linker finds shared objects

The following list describes changes to the dynamic linker search algorithm:

  • The dynamic linker no longer loads shared objects from the tls subdirectories on the library search path or the subdirectory that corresponds to the AT_PLATFORM system name.
  • The dynamic linker no longer searches subdirectories named after the legacy AT_HWCAP search mechanism.

Port your applications to the glibc-hwcaps mechanism, which has been available since RHEL 8.4.

Removed catchsegv script and libSegFault.so shared object

The catchsegv script and associated libSegFault.so shared object have been removed. You can use an out-of-process alternative for intercepting coredumps and backtraces, such as systemd-coredump and coredumpctl.

5.3. C23 support

C2X support in glibc

The GNU C Library has added some new features that are part of the C23 standard. For more information, see the glibc manual.

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