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doc/guides/mrbconf.rb: add RO_DATA configuration description; #5547

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Yukihiro "Matz" Matsumoto
2021-09-09 16:20:29 +09:00
parent 49602f636d
commit 5777e33c2a
1 changed files with 10 additions and 1 deletions
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doc/guides/mrbconf.md
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@@ -151,9 +151,18 @@ largest value of required alignment.
## Reduce heap memory configuration
`MRB_USE_ETEXT_RO_DATA_P`
* Use `etext` and `edata` section addresses defined by the linker to detect read-only data.
* Those addresses are widely available, but not portable, nor standardized.
* This macro is defined by default on User-mode Linux.
`MRB_NO_DEFAULT_RO_DATA_P`
* Define this macro when the default `mrb_ro_data_p()` does not work for any reason.
`MRB_USE_CUSTOM_RO_DATA_P`
* Takes precedence over `MRB_USE_LINK_TIME_RO_DATA_P`.
* Please try if `MRB_USE_LINK_TIME_RO_DATA_P` is not available.
* The `mrb_ro_data_p()` function is implemented by the user in an arbitrary file.
* The prototype declaration is `mrb_bool mrb_ro_data_p(const char *ptr)`.