esp_rom: don’t include locale functions when compiling with newlib 3

components/esp_rom/CMakeLists.txt

@@ -27,6 +27,10 @@ else()
         target_linker_script(${COMPONENT_TARGET} "esp32/ld/esp32.rom.newlib-nano.ld")
     endif()
 
+    if(NOT GCC_NOT_5_2_0)
+        target_linker_script(${COMPONENT_TARGET} "esp32/ld/esp32.rom.newlib-locale.ld")
+    endif()
+
     if(NOT CONFIG_SPI_FLASH_ROM_DRIVER_PATCH)
         target_linker_script(${COMPONENT_TARGET} "esp32/ld/esp32.rom.spiflash.ld")
     endif()

components/esp_rom/component.mk

@@ -16,6 +16,10 @@ ifdef CONFIG_NEWLIB_NANO_FORMAT
 LINKER_SCRIPTS += esp32.rom.newlib-nano.ld
 endif
 
+ifneq ($(GCC_NOT_5_2_0), 1)
+LINKER_SCRIPTS += esp32.rom.newlib-locale.ld
+endif
+
 ifndef CONFIG_SPI_FLASH_ROM_DRIVER_PATCH
 LINKER_SCRIPTS += esp32.rom.spiflash.ld
 endif

components/esp_rom/esp32/ld/esp32.rom.newlib-funcs.ld

@@ -63,12 +63,6 @@ __itoa = 0x40056678;
 itoa = 0x400566b4;
 labs = 0x40056370;
 ldiv = 0x40056378;
-__locale_charset = 0x40059540;
-__locale_cjk_lang = 0x40059558;
-localeconv = 0x4005957c;
-_localeconv_r = 0x40059560;
-__locale_mb_cur_max = 0x40059548;
-__locale_msgcharset = 0x40059550;
 localtime = 0x400595dc;
 localtime_r = 0x400595fc;
 longjmp = 0x400562cc;
@@ -87,8 +81,6 @@ __sccl = 0x4000c498;
 __sclose = 0x400011b8;
 __seofread = 0x40001148;
 setjmp = 0x40056268;
-setlocale = 0x40059568;
-_setlocale_r = 0x4005950c;
 __sflush_r = 0x400591e0;
 __sfmoreglue = 0x40001dc8;
 __sfp = 0x40001e90;

components/esp_rom/esp32/ld/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;