37 lines
1.3 KiB
ReStructuredText
37 lines
1.3 KiB
ReStructuredText
==============================
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``helloxx`` Hello World in C++
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==============================
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This is C++ version of the "Hello, World" example. It is intended only to
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verify that the C++ compiler is functional, that basic C++ library support is
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available, and that class are instantiated correctly.
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NuttX configuration prerequisites:
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- ``CONFIG_HAVE_CXX`` – Enable C++ Support.
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Optional NuttX configuration settings:
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- ``CONFIG_HAVE_CXXINITIALIZE`` – Enable support for static constructors (may not
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be available on all platforms).
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NuttX configuration settings specific to this example:
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- ``CONFIG_NSH_BUILTIN_APPS`` – Build the helloxx example as a built-in that can
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be executed from the NSH command line.
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Also needed:
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- ``CONFIG_HAVE_CXX=y``
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And you may have to tinker with the following to get libxx to compile properly:
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- ``CCONFIG_ARCH_SIZET_LONG=y`` or ``=n``.
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The argument of the ``new`` operators should take a type of ``size_t``. But ``size_t``
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has an unknown underlying. In the nuttx ``sys/types.h`` header file, ``size_t`` is
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typed as ``uint32_t`` (which is determined by architecture-specific logic). But
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the C++ compiler may believe that ``size_t`` is of a different type resulting in
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compilation errors in the operator. Using the underlying integer type Instead of
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``size_t`` seems to resolve the compilation issues.
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