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build system: add COMPILER_SAVE_RESTORE_LIBCALLS option

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Add new Kconfig option to enable -msave-restore flag for RISC-V
targets. This option can be used to reduce binary size by replacing
inlined register save/restore sequences with library calls.
This commit is contained in:
Ivan Grokhotkov
2021-08-18 12:02:20 +05:00
parent bb15aa48a0
commit 95ee8104bf
4 changed files with 19 additions and 0 deletions
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docs/en/api-guides/performance/size.rst
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@@ -298,6 +298,7 @@ The following configuration options will reduce the final binary size of almost
- Don't enable :ref:`CONFIG_COMPILER_CXX_EXCEPTIONS`, :ref:`CONFIG_COMPILER_CXX_RTTI`, or set the :ref:`CONFIG_COMPILER_STACK_CHECK_MODE` to Overall. All of these options are already disabled by default, but they have a large impact on binary size.
- Disabling :ref:`CONFIG_ESP_ERR_TO_NAME_LOOKUP` will remove the lookup table to translate user-friendly names for error values (see :doc:`/api-guides/error-handling`) in error logs, etc. This saves some binary size, but error values will be printed as integers only.
- Setting :ref:`CONFIG_ESP_SYSTEM_PANIC` to "Silent reboot" will save a small amount of binary size, however this is *only* recommended if no one will use UART output to debug the device.
:CONFIG_IDF_TARGET_ARCH_RISCV: - Set :ref:`CONFIG_COMPILER_SAVE_RESTORE_LIBCALLS` to reduce binary size by replacing inlined prologues/epilogues with library calls.
.. note::