tool_chain: add aarch64 compiler target

Ref #3260

repos/ports/ports/gcc.hash

@@ -1 +1 @@
-b6533ff19936e6aceac99a98b8a29779e5f8a393
+893d85767720fc2b3c695c56d737d2307b1f2229

repos/ports/src/noux-pkg/gcc/patches/aarch64.patch

@@ -0,0 +1,40 @@
+diff --git a/gcc/config/aarch64/aarch64.h b/gcc/config/aarch64/aarch64.h
+index b9bf979..86f64f9 100644
+--- a/gcc/config/aarch64/aarch64.h
++++ b/gcc/config/aarch64/aarch64.h
+@@ -935,4 +935,20 @@ extern const char *host_detect_local_cpu (int argc, const char **argv);
+ extern tree aarch64_fp16_type_node;
+ extern tree aarch64_fp16_ptr_type_node;
+ 
++/* genode.h */
++
++/*
++ * The 'LINK_SPEC' define comprises the rules of how the GCC frontend invokes
++ * the linker.
++ */
++
++#undef LINK_SPEC
++#define LINK_SPEC \
++  "%(shared:-shared) \
++   %{!static:--eh-frame-hdr}"
++
++/* Don't assume anything about the header files.  */
++/* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57699 */
++#define NO_IMPLICIT_EXTERN_C
++
+ #endif /* GCC_AARCH64_H */
+diff --git a/libgcc/config.host b/libgcc/config.host
+index fd206a4..a9a07ad 100644
+--- a/libgcc/config.host
++++ b/libgcc/config.host
+@@ -331,8 +331,9 @@ esac
+ 
+ case ${host} in
+ aarch64*-*-elf | aarch64*-*-rtems*)
+-	extra_parts="$extra_parts crtbegin.o crtend.o crti.o crtn.o"
++	extra_parts="$extra_parts crtbegin.o crtbeginS.o crtbeginT.o crtend.o crti.o crtn.o"
+ 	extra_parts="$extra_parts crtfastmath.o"
++	tmake_file="$tmake_file t-freebsd t-crtstuff-pic t-libgcc-pic t-eh-dw2-dip t-slibgcc t-slibgcc-gld t-slibgcc-elf-ver"
+ 	tmake_file="${tmake_file} ${cpu_type}/t-aarch64"
+ 	tmake_file="${tmake_file} ${cpu_type}/t-softfp t-softfp t-crtfm"
+ 	;;

repos/ports/src/noux-pkg/gcc/patches/series

@@ -11,3 +11,4 @@ target_libbacktrace.patch
 noux_build.patch
 arm.patch
 new_opa.patch
+aarch64.patch

tool/tool_chain

@@ -15,6 +15,7 @@ help:
 	$(ECHO) "--- available commands ---"
 	$(ECHO) "x86         - create tool chain for x86"
 	$(ECHO) "arm         - create tool chain for arm"
+	$(ECHO) "aarch64     - create tool chain for aarch64/arm64"
 	$(ECHO) "riscv       - create tool chain for riscv"
 	$(ECHO) "clean       - clean everything except downloaded archives"
 	$(ECHO) "cleanall    - clean everything including downloaded archives"
@@ -30,7 +31,7 @@ help:
 # User interface
 #
 
-SUPPORTED_PLATFORMS := x86 arm riscv
+SUPPORTED_PLATFORMS := x86 arm riscv aarch64
 
 PLATFORM := $(firstword $(filter $(SUPPORTED_PLATFORMS),$(MAKECMDGOALS)))
 
@@ -193,6 +194,7 @@ LOCAL_LIB_INSTALL_LOCATION = $(BUILD_LOCATION)/lib-install
 TARGET_NAME_x86        = x86_64-pc-elf
 TARGET_NAME_arm        = arm-none-eabi
 TARGET_NAME_riscv      = riscv64-unknown-elf
+TARGET_NAME_aarch64    = aarch64-none-elf
 
 GCC_CONFIG_riscv       = --with-arch=rv64imac --with-abi=lp64