build: Misc updates for new freestanding-toolchain

GNUmakefile.in

@@ -25,7 +25,7 @@ MKESCAPE = $(subst $(SPACE),\ ,$(1))
 SHESCAPE = $(subst ','\'',$(1))
 NASMESCAPE = $(subst ','"'$(COMMA) \"'\"$(COMMA) '"',$(1))
 
-define DEFAULT_VAR =
+define PROPER_ASSIGN =
     ifeq ($(origin $1),default)
         override $(1) := $(2)
     endif
@@ -43,7 +43,7 @@ override BUILD_PXE := @BUILD_PXE@
 override BUILD_CD := @BUILD_CD@
 override BUILD_LIMINE_DEPLOY := @BUILD_LIMINE_DEPLOY@
 
-$(eval $(call DEFAULT_VAR,CC,@CC@))
+$(eval $(call PROPER_ASSIGN,CC,@CC@))
 export CC
 
 override MKDIR_P := @MKDIR_P@

common/GNUmakefile

@@ -1,6 +1,11 @@
 override MAKEFLAGS += -rR
 
 include $(TOOLCHAIN_FILE)
+export CC_FOR_TARGET
+export LD_FOR_TARGET
+export OBJDUMP_FOR_TARGET
+export OBJCOPY_FOR_TARGET
+export READELF_FOR_TARGET
 
 TARGET ?=
 BUILDDIR ?=

decompressor/GNUmakefile

@@ -1,6 +1,11 @@
 override MAKEFLAGS += -rR
 
 include $(TOOLCHAIN_FILE)
+export CC_FOR_TARGET
+export LD_FOR_TARGET
+export OBJDUMP_FOR_TARGET
+export OBJCOPY_FOR_TARGET
+export READELF_FOR_TARGET
 
 BUILDDIR ?=
 

test/GNUmakefile

@@ -1,4 +1,9 @@
 include $(TOOLCHAIN_FILE)
+export CC_FOR_TARGET
+export LD_FOR_TARGET
+export OBJDUMP_FOR_TARGET
+export OBJCOPY_FOR_TARGET
+export READELF_FOR_TARGET
 
 override CC := $(CC_FOR_TARGET)
 CFLAGS = -O2 -g -Wall -Wextra