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BUILD/MEDIUM: initcall: Fix build on MacOS.

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MacOS syntax for sections is a bit different, so implement it.
(see issue #42).

This should be backported to 1.9.
This commit is contained in:
Olivier Houchard 2019-02-13 16:22:17 +01:00 committed by Olivier Houchard
parent 5a606685f1
commit 9efa7b8ba8
1 changed files with 19 additions and 1 deletions
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20
include/common/initcall.h
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@ -32,6 +32,11 @@
/* List of known init stages. If others are added, please declare their /* List of known init stages. If others are added, please declare their
* section at the end of the file below. * section at the end of the file below.
*/ */
/*
* Please keep those names short enough, they are used to generate section
* names, Mac OS X accepts section names up to 16 characters, and we prefix
* them with i_, so stage name can't be more than 14 characters.
*/
enum init_stage { enum init_stage {
STG_PREPARE = 0, // preset variables, tables, list heads STG_PREPARE = 0, // preset variables, tables, list heads
STG_LOCK, // pre-initialize locks STG_LOCK, // pre-initialize locks
@ -50,6 +55,12 @@ struct initcall {
void *arg3; void *arg3;
}; };
#ifdef __APPLE__
#define HA_SECTION(s) __section__("__DATA, i_" # s)
#else
#define HA_SECTION(s) __section__("init_" # s)
#endif
/* Declare a static variable in the init section dedicated to stage <stg>, /* Declare a static variable in the init section dedicated to stage <stg>,
* with an element referencing function <function> and arguments <a1..a3>. * with an element referencing function <function> and arguments <a1..a3>.
* <linenum> is needed to deduplicate entries created from a same file. The * <linenum> is needed to deduplicate entries created from a same file. The
@ -62,7 +73,7 @@ struct initcall {
*/ */
#define __DECLARE_INITCALL(stg, linenum, function, a1, a2, a3) \ #define __DECLARE_INITCALL(stg, linenum, function, a1, a2, a3) \
static const struct initcall *__initcb_##linenum \ static const struct initcall *__initcb_##linenum \
__attribute__((__used__,__section__("init_"#stg))) = \ __attribute__((__used__,HA_SECTION(stg))) = \
(stg < STG_SIZE) ? &(const struct initcall) { \ (stg < STG_SIZE) ? &(const struct initcall) { \
.fct = (void (*)(void *,void *,void *))function, \ .fct = (void (*)(void *,void *,void *))function, \
.arg1 = (void *)(a1), \ .arg1 = (void *)(a1), \
@ -113,9 +124,16 @@ struct initcall {
* empty. The corresponding sections must contain exclusively pointers to * empty. The corresponding sections must contain exclusively pointers to
* make sure each location may safely be visited by incrementing a pointer. * make sure each location may safely be visited by incrementing a pointer.
*/ */
#ifdef __APPLE__
#define DECLARE_INIT_SECTION(stg) \
extern __attribute__((__weak__)) const struct initcall *__start_init_##stg __asm("section$start$__DATA$i_" # stg); \
extern __attribute__((__weak__)) const struct initcall *__stop_init_##stg __asm("section$end$__DATA$i_" # stg)
#else
#define DECLARE_INIT_SECTION(stg) \ #define DECLARE_INIT_SECTION(stg) \
extern __attribute__((__weak__)) const struct initcall *__start_init_##stg; \ extern __attribute__((__weak__)) const struct initcall *__start_init_##stg; \
extern __attribute__((__weak__)) const struct initcall *__stop_init_##stg extern __attribute__((__weak__)) const struct initcall *__stop_init_##stg
#endif
/* Declare all initcall sections here */ /* Declare all initcall sections here */
DECLARE_INIT_SECTION(STG_PREPARE); DECLARE_INIT_SECTION(STG_PREPARE);