libstdc++ selects between a lock-free and a mutex-based policy for
std::shared_ptr reference counting based on this macro. Enabling this
option forces the lock-free policy, which avoids pulling in the
mutex-based implementation and can reduce code size.
Note: the lock-free policy avoids embedding a mutex in each control
block, saving about 88 bytes per shared_ptr, and improves performance
by using atomic operations instead of mutex locking.
Note: this option changes the ABI of libstdc++ atomic/shared_ptr
helpers. It can be incompatible when linking against prebuilt
libraries that were compiled without it, leading to link errors or
undefined runtime behavior. Only enable it if all C++ objects and
libraries in the build use the same setting.
Document CONFIG_COMPILER_LTO_LINKTIME / CONFIG_COMPILER_LTO_COMPILETIME in the
binary size reduction guide, including the caveats: less accurate per-component
size breakdown, longer build times, incompatibility with custom linker
fragments, and harder debugging.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
- Dynamically switch the AES operation modes based on the buffer operating length
- Shorter AES and SHA operations can now run faster and concurrently as well
Closes https://github.com/espressif/esp-idf/issues/15914
The following updates have been made in this commit:
- The commit places ring buffer code in flash memory by default.
- CONFIG_RINGBUF_PLACE_FUNCTIONS_INTO_FLASH has been removed.
- CONFIG_RINGBUF_IN_IRAM is added and can be used to restore the
previous memory placement.
The following updates have been made in this commit:
- The commit places FreeRTOS code in flash memory by default.
- CONFIG_FREERTOS_PLACE_FUNCTIONS_INTO_FLASH has been removed.
- CONFIG_FREERTOS_IN_IRAM is unhidden and can be used to restore the
previous memory placement.
- A test has been added for users to conduct performance impact testing
based on memory placement configurations.
The documentation for the IDF Size tool has been relocated from the
performance section to the tools section and updated to reflect the
current refactored version of esp-idf-size.
Signed-off-by: Frantisek Hrbata <frantisek.hrbata@espressif.com>
