[tables] Redefine methods for accessing linker tables

Intel's C compiler (icc) chokes on the zero-length arrays that we
currently use as part of the mechanism for accessing linker table
entries.  Abstract away the zero-length arrays, to make a port to icc
easier.

Introduce macros such as for_each_table_entry() to simplify the common
case of iterating over all entries in a linker table.

Represent table names as #defined string constants rather than
unquoted literals; this avoids visual confusion between table names
and C variable or type names, and also allows us to force a
compilation error in the event of incorrect table names.

1 files changed, 8 insertions, 2 deletions

diff --git a/src/include/gpxe/init.h b/src/include/gpxe/init.h
index e0e9f9c8..9ce56d77 100644
--- a/src/include/gpxe/init.h
+++ b/src/include/gpxe/init.h
@@ -13,9 +13,12 @@ struct init_fn {
 	void ( * initialise ) ( void );
 };
 
+/** Initialisation function table */
+#define INIT_FNS "init_fns"
+
 /** Declare an initialisation functon */
 #define __init_fn( init_order ) \
-	__table ( struct init_fn, init_fns, init_order )
+	__table ( struct init_fn, INIT_FNS, init_order )
 
 /** @defgroup initfn_order Initialisation function ordering
  * @{
@@ -49,9 +52,12 @@ struct startup_fn {
 	void ( * shutdown ) ( int flags );
 };
 
+/** Startup/shutdown function table */
+#define STARTUP_FNS "startup_fns"
+
 /** Declare a startup/shutdown function */
 #define __startup_fn( startup_order ) \
-	__table ( struct startup_fn, startup_fns, startup_order )
+	__table ( struct startup_fn, STARTUP_FNS, startup_order )
 
 /** @defgroup startfn_order Startup/shutdown function ordering
  *