Move Newlib locale table to flash, save 320B RAM (#3267)

earlephilhower · web-flow · commit 6518a874c148 · 2025-12-11T13:22:40.000-08:00
Newlib doesn't really support locale operations, so the global locale
can be considered const.  Move it to only live in flash, freeing
up 360 bytes of RAM for apps.
diff --git a/lib/rp2040/memmap_default.ld b/lib/rp2040/memmap_default.ld
@@ -136,6 +136,8 @@ SECTIONS
         . = ALIGN(4);
         *(SORT_BY_ALIGNMENT(SORT_BY_NAME(.flashdata*)))
         . = ALIGN(4);
+        *libc_a-locale.o(.data)
+        . = ALIGN(4);
     } > FLASH
 
     .ARM.extab :
diff --git a/lib/rp2350-riscv/memmap_default.ld b/lib/rp2350-riscv/memmap_default.ld
@@ -149,6 +149,8 @@ SECTIONS
         . = ALIGN(4);
         *(SORT_BY_ALIGNMENT(SORT_BY_NAME(.flashdata*)))
         . = ALIGN(4);
+        *libc_a-locale.o(.data)
+        . = ALIGN(4);
     } > FLASH
 
     .ARM.extab :
diff --git a/lib/rp2350/memmap_default.ld b/lib/rp2350/memmap_default.ld
@@ -149,6 +149,8 @@ SECTIONS
         . = ALIGN(4);
         *(SORT_BY_ALIGNMENT(SORT_BY_NAME(.flashdata*)))
         . = ALIGN(4);
+        *libc_a-locale.o(.data)
+        . = ALIGN(4);
     } > FLASH
 
     .ARM.extab :
