BaseTools AARCH64: add separate GCC build rule for XIP objects

This introduces a special .c to .obj build rule for GCC/AARCH64 that
takes into account additional compiler flags that have been specified
via *_*_*_CC_XIPFLAGS. These will be passed after (and in addition to)
the ordinary CC_FLAGS.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Liming Gao <liming.gao@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@19637 6f19259b-4bc3-4df7-8a09-765794883524

BaseTools/Conf/build_rule.template

@@ -161,6 +161,19 @@
         "$(CC)" $(CC_FLAGS) -o ${dst} $(INC) ${src}
         "$(SYMRENAME)" $(SYMRENAME_FLAGS) ${dst}
 
+[C-Code-File.BASE.AARCH64,C-Code-File.SEC.AARCH64,C-Code-File.PEI_CORE.AARCH64,C-Code-File.PEIM.AARCH64]
+    <InputFile>
+        ?.c
+
+    <ExtraDependency>
+        $(MAKE_FILE)
+
+    <OutputFile>
+        $(OUTPUT_DIR)(+)${s_dir}(+)${s_base}.obj
+
+    <Command.GCC>
+        "$(CC)" $(CC_FLAGS) $(CC_XIPFLAGS) -o ${dst} $(INC) ${src}
+
 [C-Header-File]
     <InputFile>
         *.h, *.H