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85 lines
3.3 KiB
85 lines
3.3 KiB
#
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# Copyright (c) 2023, Arm Limited. All rights reserved.
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#
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# SPDX-License-Identifier: BSD-3-Clause
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#
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# This build helper makefile is used to determine a suitable march build
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# option to be used, based on platform provided ARM_ARCH_MAJOR/MINOR
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# data and compiler supported march version.
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# Set the compiler's target architecture profile based on
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# ARM_ARCH_MAJOR and ARM_ARCH_MINOR options.
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# This is used to collect available march values from compiler.
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# Example on a gcc-12.2 arm64 toolchain it will look like:
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# [...]
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#./aarch64-none-elf-gcc --target-help -march=foo
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# cc1: error: unknown value 'foo' for '-march'
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# cc1: note: valid arguments are: armv8-a armv8.1-a armv8.2-a armv8.3-a armv8.4-a armv8.5-a
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# armv8.6-a armv8.7-a armv8.8-a armv8-r armv9-a
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# [...]
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#
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GCC_MARCH_OUTPUT := $(shell $(CC) -march=foo -Q --help=target -v 2>&1)
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# This function is used to find the best march value supported by the given compiler.
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# We try to use `GCC_MARCH_OUTPUT` which has verbose message with supported march values we filter that
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# to find armvX.Y-a or armvX-a values, then filter the best supported arch based on ARM_ARCH_MAJOR.
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#
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# Example on a gcc-12.2 arm64 toolchain this will return armv9-a if platform requested for armv9.2-a
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# Similarly on gcc 11.3 it would return armv8.6-a if platform requested armv8.8-a
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define major_best_avail_march
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$(1) := $(lastword $(filter armv$(ARM_ARCH_MAJOR)% ,$(filter armv%-a, $(GCC_MARCH_OUTPUT))))
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endef
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# This function is used to just return latest march value supported by the given compiler.
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#
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# Example: this would return armv8.6-a on a gcc-11.3 when platform requested for armv9.0-a
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#
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# Thus this function should be used in conjunction with major_best_avail_march, when best match
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# is not found it should be ok to try with lastest known supported march value from the
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# compiler.
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define latest_match_march
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$(1) := $(lastword $(filter armv%-a, $(GCC_MARCH_OUTPUT)))
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endef
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ifdef MARCH_DIRECTIVE
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march-directive := $(MARCH_DIRECTIVE)
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else
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ifeq (${ARM_ARCH_MINOR},0)
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provided-march = armv${ARM_ARCH_MAJOR}-a
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else
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provided-march = armv${ARM_ARCH_MAJOR}.${ARM_ARCH_MINOR}-a
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endif
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ifeq ($(findstring clang,$(notdir $(CC))),)
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# We expect from Platform to provide a correct Major/Minor value but expecting something
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# from compiler with unsupported march means we shouldn't fail without trying anything,
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# so here we try to find best supported march value and use that for compilation.
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# If we don't support current march version from gcc compiler, try with lower arch based on
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# availability. In TF-A there is no hard rule for need of higher version march for basic
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# functionality, denying a build on only this fact doesn't look correct, so try with best
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# or latest march values from whats available from compiler.
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ifeq (,$(findstring $(provided-march), $(GCC_MARCH_OUTPUT)))
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$(eval $(call major_best_avail_march, available-march))
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ifeq (, $(available-march))
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$(eval $(call latest_match_march, available-march))
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endif
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# If we fail to come up with any available-march value so far, don't update
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# provided-march and thus allow the build to fail using the provided-march
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# which is derived based on arch_major and arch_minor values.
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ifneq (,$(available-march))
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provided-march := ${available-march}
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endif
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endif # provided-march supported
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endif # not clang
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march-directive := -march=${provided-march}
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endif # MARCH_DIRECTIVE
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