From b1c7a66ca6ff913afba17cfe6f16a78a66915c07 Mon Sep 17 00:00:00 2001 From: Denys Vlasenko Date: Thu, 1 Oct 2020 00:34:44 +0200 Subject: libbb: extend "errno pointer" trick to other than __GLIBC__ Savings on musl: function old new delta resume_main 582 614 +32 lbb_prepare - 20 +20 seq_main 432 449 +17 fgetsetversion 74 88 +14 ... script_main 1207 1180 -27 close_silently 28 - -28 shell_builtin_ulimit 655 626 -29 lineedit_read_key 280 247 -33 ------------------------------------------------------------------------------ (add/remove: 2/1 grow/shrink: 25/123 up/down: 182/-882) Total: -700 bytes text data bss dec hex filename 1005858 551 5676 1012085 f7175 busybox_old 1005136 551 5680 1011367 f6ea7 busybox_unstripped Signed-off-by: Denys Vlasenko --- include/libbb.h | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) (limited to 'include') diff --git a/include/libbb.h b/include/libbb.h index 83ecca47f..df7e45404 100644 --- a/include/libbb.h +++ b/include/libbb.h @@ -339,12 +339,13 @@ struct BUG_off_t_size_is_misdetected { #endif #endif -#if defined(__GLIBC__) -/* glibc uses __errno_location() to get a ptr to errno */ -/* We can just memorize it once - no multithreading in busybox :) */ +#if defined(errno) +/* If errno is a define, assume it's "define errno (*__errno_location())" + * and we will cache it's result in this variable */ extern int *const bb_errno; #undef errno #define errno (*bb_errno) +#define bb_cached_errno_ptr 1 #endif #if !(ULONG_MAX > 0xffffffff) -- cgit v1.2.3