allow feature unification of rt on ch32-metapac dependency

.gitignore

@@ -8,7 +8,6 @@ target
 
 Cargo.lock
 !cli/Cargo.lock
-!examples/**/Cargo.lock
 
 # mdbook output
 /book

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Fixed
+
+- `tinyboot-ch32-rt` (0.4.1): trim `link.x` to drop unused vector-table / exception / trap KEEPs the bootloader never produces. Boot binaries are now tolerant of downstream PACs (e.g. `ch32-metapac` with the `rt` feature) emitting `__EXTERNAL_INTERRUPTS` under cargo feature unification — `--gc-sections` drops the unreferenced static. Bootloader flash size is unchanged.
+
 ## [0.4.1] - 2026-05-07
 
 ### Added

ch32/rt/Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "tinyboot-ch32-rt"
 description = "Minimal tinyboot runtime for CH32"
-version = "0.4.0"
+version = "0.4.1"
 edition.workspace = true
 repository.workspace = true
 license.workspace = true

ch32/rt/link.x

@@ -4,52 +4,30 @@ ENTRY(_start);
 
 SECTIONS
 {
-    .vector_table ORIGIN(CODE) :
+    .text ORIGIN(CODE) :
     {
         KEEP(*(SORT_NONE(.init)));
         . = ALIGN(4);
-        KEEP(*(.vector_table.core_interrupts));
-        KEEP(*(.vector_table.external_interrupts));
-        KEEP(*(.vector_table.exceptions));
-        *(.trap .trap.rust);
-    } > CODE AT> BOOT
-
-    .text : ALIGN(4)
-    {
-        KEEP(*(SORT_NONE(.handle_reset)));
-        *(.init.rust);
         *(.text .text.*);
     } > CODE AT> BOOT
 
     .rodata : ALIGN(4)
     {
-        *(.srodata .srodata.*);
-        *(.rodata .rodata.*);
+        *(.srodata .srodata.* .rodata .rodata.*);
         . = ALIGN(4);
     } > CODE AT> BOOT
 
     .data : ALIGN(4)
     {
-        _sidata = LOADADDR(.data);
-        _sdata = .;
         PROVIDE(__global_pointer$ = . + 0x800);
-        *(.sdata .sdata.* .sdata2 .sdata2.*);
-        *(.data .data.*);
+        *(.sdata .sdata.* .sdata2 .sdata2.* .data .data.*);
         . = ALIGN(4);
-        _edata = .;
     } > RAM AT> BOOT
 
     .bss (NOLOAD) : ALIGN(4)
     {
-        _sbss = .;
         *(.sbss .sbss.* .bss .bss.*);
         . = ALIGN(4);
-        _ebss = .;
-    } > RAM
-
-    .uninit (NOLOAD) : ALIGN(4)
-    {
-        *(.uninit .uninit.*);
     } > RAM
 
     _stack_top = ORIGIN(RAM) + LENGTH(RAM);