feat: add libc

targets/esp32.rom.newlib-locale.ld

@@ -0,0 +1,19 @@
+/* These are the locale-related newlib functions present in ESP32 ROM.
+   ESP32 ROM contains newlib version 2.2.0, and these functions should not be
+   used when compiling with newlib version 3, since locale implementation is
+   different there.
+
+   Unlike other ROM functions which are exported using PROVIDE, which declares
+   weak symbols, newlib related functions are exported using assignment,
+   which declares strong symbols. This is done so that ROM functions are always
+   used instead of the ones provided by libc.a.
+ */
+
+__locale_charset = 0x40059540;
+__locale_cjk_lang = 0x40059558;
+localeconv = 0x4005957c;
+_localeconv_r = 0x40059560;
+__locale_mb_cur_max = 0x40059548;
+__locale_msgcharset = 0x40059550;
+setlocale = 0x40059568;
+_setlocale_r = 0x4005950c;