If ld 2.37 with -Wl,-z,start-stop-gc -Wl,--gc-sections or lld-13 with -Wl,--gc-sections, the build with either fail with ld.lld: error: undefined symbol: __start___command Or in case of ld 2.37 just show a single command (aggregation). A new attribute retain was introduced which is then emitting the ELF flag SHF_GNU_RETAIN. This will cause the garbage collector to retain this section. Signed-off-by: Sven Eckelmann <sven(a)narfation.org&gt; --- main.h | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/main.h b/main.h index 00b2ab3..6b11acc 100644 --- a/main.h +++ b/main.h @@ -101,6 +101,12 @@ struct command { const char *usage; }; +#if defined(__has_attribute) && __has_attribute(retain) +#define start_stop_retain __attribute__((retain)) +#else +#define start_stop_retain +#endif + #define COMMAND_NAMED(_type, _name, _abbr, _handler, _flags, _arg, _usage) \ static const struct command command_ ## _name ## _ ## _type = { \ .type = (_type), \ @@ -112,7 +118,7 @@ struct command { .usage = (_usage), \ }; \ static const struct command *__command_ ## _name ## _ ## _type \ - __attribute__((__used__,__section__ ("__command"))) = &command_ ## _name ## _ ## _type + __attribute__((__used__,__section__ ("__command"))) start_stop_retain = &command_ ## _name ## _ ## _type #define COMMAND(_type, _handler, _abbr, _flags, _arg, _usage) \ COMMAND_NAMED(_type, _handler, _abbr, _handler, _flags, _arg, _usage) -- 2.30.2