[ECOS] SH build - Odd Link Error

["Nick - eCos Developer" <n_ecos at targus dot net>]

Using: GCC built for target sh: "gcc version 2.95.1 19990816 (release)"
running on Linux. Although I can get the same error on NT.

I get the link error: undefined reference to 'dsr_disable_counter'

implicating the declaration near line 60 drv_api.c:

(Complete path "ecos/packages/hal/common/current/src/drv_api.c")

Line 60+ from drv_api.c

<snip>

//--------------------------------------------------------------------------

// Statics

static volatile cyg_int32 isr_disable_counter = 1; // ISR disable counter

volatile cyg_int32 dsr_disable_counter asm("cyg_scheduler_sched_lock"); //
DSR disable counter

static cyg_interrupt* volatile dsr_list; // List of pending DSRs

<snip>

The middle declaration seems to be declaring space for
cyg_scheduler_sched_lock and simultaneously giving it the alias
dsr_disable_counter, so If I simplify this FROM:

volatile cyg_int32 dsr_disable_counter asm("cyg_scheduler_sched_lock");

TO:

volatile cyg_int32 cyg_scheduler_sched_lock;

#define dsr_disable_counter cyg_scheduler_sched_lock // DSR disable counter

It will compile and "seems" to work. Am I correct in assuming that the
original line allocated space for cyg_scheduler_sched_lock and made
dsr_disable_counter an alias for it in this file. (Other files (some
assembler) refer only to the name cyg_scheduler_sched_lock.

What is this and why the complex syntax? Is my hack equivalent?