C++ Code Size - 2021.2 English

Vitis Unified Software Platform Documentation: Embedded Software Development (UG1400)

Document ID
UG1400
ft:locale
English (United States)
Release Date
2021-12-15
Version
2021.2 English

The GCC toolchain combined with the latest open source C++ standard library (libstdc++-v3) might be found to generate large code and data fragments as compared to an equivalent C program. A significant portion of this overhead comes from code and data for exception handling and runtime type information. Some C++ applications do not require these features.

To remove the overhead and optimize for size, use the -fno-exceptions and/or the -fno-rtti switches. This is recommended only for advanced users who know the requirements of their application and understand these language features. Refer to the GCC documentation for more specific information on available compiler options and their impact.

C++ programs might have more intensive dynamic memory requirements (stack and heap size) due to more complex language features and library routines. Many of the C++ library routines can request memory to be allocated from the heap. Review your heap and stack size requirements for C++ programs to ensure that they are satisfied.