libc: Optimize malloc() initialization

The BSPs provide memory for the separate C Program Heap initialization
via _Memory_Get().  Most BSPs provide exactly one memory area.  Only two
BSPs provide more than one memory area (arm/altera-cyclone-v and
bsps/powerpc/mpc55xxevb).  Only if more than one memory area is
provided, there is a need to use _Heap_Extend().  Provide two
implementations to initialize the separate C Program Heap and let the
BSP select one of the implementations based on the number of provided
memory areas.  This gets rid of a dependency on _Heap_Extend().  It
also avoids dead code sections for most BSPs.

Change licence to BSD-2-Clause according to file history.

Update #3053.

spec/build/bsps/arm/altera-cyclone-v/bspalteracyclonev.yml

@@ -139,6 +139,7 @@ source:
 - bsps/shared/irq/irq-default-handler.c
 - bsps/shared/start/bsp-fdt.c
 - bsps/shared/start/gettargethash-default.c
+- bsps/shared/start/mallocinitmulti.c
 - bsps/shared/start/sbrk.c
 - bsps/shared/start/stackalloc.c
 - bsps/shared/start/wkspaceinitmulti.c

spec/build/bsps/arm/imx/bspimx.yml

@@ -106,6 +106,7 @@ source:
 - bsps/shared/start/bsp-fdt.c
 - bsps/shared/start/bspfatal-default.c
 - bsps/shared/start/gettargethash-default.c
+- bsps/shared/start/mallocinitone.c
 - bsps/shared/start/sbrk.c
 - bsps/shared/start/stackalloc.c
 - bsps/shared/start/wkspaceinitone.c

spec/build/bsps/arm/raspberrypi/obj.yml

@@ -56,6 +56,7 @@ source:
 - bsps/shared/start/bsp-fdt.c
 - bsps/shared/start/bspfatal-default.c
 - bsps/shared/start/gettargethash-default.c
+- bsps/shared/start/mallocinitone.c
 - bsps/shared/start/sbrk.c
 - bsps/shared/start/stackalloc.c
 - bsps/shared/start/wkspaceinitone.c

spec/build/bsps/i386/pc386/obj.yml

@@ -80,6 +80,7 @@ source:
 - bsps/shared/irq/irq-default-handler.c
 - bsps/shared/start/bspfatal-default.c
 - bsps/shared/start/gettargethash-default.c
+- bsps/shared/start/mallocinitone.c
 - bsps/shared/start/sbrk.c
 - bsps/shared/start/wkspaceinitone.c
 type: build

spec/build/bsps/objmem.yml

@@ -11,5 +11,6 @@ install: []
 links: []
 source:
 - bsps/shared/start/bspgetworkarea-default.c
+- bsps/shared/start/mallocinitone.c
 - bsps/shared/start/wkspaceinitone.c
 type: build

spec/build/bsps/powerpc/mpc55xxevb/obj.yml

@@ -94,6 +94,7 @@ source:
 - bsps/shared/irq/irq-default-handler.c
 - bsps/shared/start/bspfatal-default.c
 - bsps/shared/start/gettargethash-default.c
+- bsps/shared/start/mallocinitmulti.c
 - bsps/shared/start/stackalloc.c
 - bsps/shared/start/wkspaceinitmulti.c
 type: build

spec/build/bsps/powerpc/objmem.yml

@@ -11,5 +11,6 @@ install: []
 links: []
 source:
 - bsps/powerpc/shared/start/bspgetworkarea.c
+- bsps/shared/start/mallocinitone.c
 - bsps/shared/start/wkspaceinitone.c
 type: build

spec/build/bsps/powerpc/qoriq/obj.yml

@@ -72,6 +72,7 @@ source:
 - bsps/shared/start/bsp-fdt.c
 - bsps/shared/start/bspfatal-default.c
 - bsps/shared/start/gettargethash-default.c
+- bsps/shared/start/mallocinitone.c
 - bsps/shared/start/sbrk.c
 - bsps/shared/start/wkspaceinitone.c
 type: build

spec/build/bsps/powerpc/tqm8xx/obj.yml

@@ -46,6 +46,7 @@ source:
 - bsps/shared/start/bspfatal-default.c
 - bsps/shared/start/bspreset-empty.c
 - bsps/shared/start/gettargethash-default.c
+- bsps/shared/start/mallocinitone.c
 - bsps/shared/start/sbrk.c
 - bsps/shared/start/wkspaceinitone.c
 type: build

spec/build/bsps/sparc/objmem.yml

@@ -10,6 +10,7 @@ includes: []
 install: []
 links: []
 source:
+- bsps/shared/start/mallocinitone.c
 - bsps/shared/start/wkspaceinitone.c
 - bsps/sparc/shared/start/bspgetworkarea.c
 type: build

spec/build/cpukit/librtemscpu.yml

@@ -675,7 +675,6 @@ source:
 - cpukit/libcsupport/src/malloc.c
 - cpukit/libcsupport/src/malloc_deferred.c
 - cpukit/libcsupport/src/malloc_dirtier.c
-- cpukit/libcsupport/src/malloc_initialize.c
 - cpukit/libcsupport/src/malloc_walk.c
 - cpukit/libcsupport/src/mallocdirtydefault.c
 - cpukit/libcsupport/src/mallocextenddefault.c