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Re: [PATCH v6 05/11] rules.mak: Add base-arch() rule
From: |
Alex Bennée |
Subject: |
Re: [PATCH v6 05/11] rules.mak: Add base-arch() rule |
Date: |
Mon, 08 Jun 2020 11:10:28 +0100 |
User-agent: |
mu4e 1.5.2; emacs 28.0.50 |
Philippe Mathieu-Daudé <philmd@redhat.com> writes:
> Add a rule to return the base architecture for a QEMU target.
>
> The current list of TARGET_BASE_ARCH is:
>
> $ git grep TARGET_BASE_ARCH configure
> configure:7785:TARGET_BASE_ARCH=""
> configure:7795: TARGET_BASE_ARCH=i386
> configure:7813: TARGET_BASE_ARCH=arm
> configure:7846: TARGET_BASE_ARCH=mips
> configure:7854: TARGET_BASE_ARCH=mips
> configure:7864: TARGET_BASE_ARCH=openrisc
> configure:7871: TARGET_BASE_ARCH=ppc
> configure:7879: TARGET_BASE_ARCH=ppc
> configure:7887: TARGET_BASE_ARCH=ppc
> configure:7894: TARGET_BASE_ARCH=riscv
> configure:7900: TARGET_BASE_ARCH=riscv
> configure:7920: TARGET_BASE_ARCH=sparc
> configure:7925: TARGET_BASE_ARCH=sparc
This seems backwards. We encode the base architecture in configure.sh
because this is where we can make such distinctions. We then:
echo "TARGET_BASE_ARCH=$TARGET_BASE_ARCH" >> $config_target_mak
Precisely so the make system can know what it is for any given target.
So:
> +# base-arch
> +# Usage: $(call base-arch, target)
> +#
> +# @target: the target architecture.
> +#
> +# This macro will return the base architecture for a target.
> +#
> +# As example, $(call base-arch, aarch64) returns 'arm'.
> +base-arch = $(strip \
> + $(if $(call startwith,aarch64,$1),arm,\
> + $(if $(call startwith,arm,$1),arm,\
> + $(if $(call startwith,microblaze,$1),microblaze,\
> + $(if $(call startwith,mips,$1),mips,\
> + $(if $(call startwith,ppc,$1),ppc,\
> + $(if $(call startwith,riscv,$1),riscv,\
> + $(if $(call startwith,sh4,$1),sh4,\
> + $(if $(call startwith,sparc,$1),sparc,\
> + $(if $(call startwith,xtensa,$1),xtensa,\
> + $(if $(call strequal,x86_64,$1),i386,\
> + $1\
> + )\
> + )\
> + )\
> + )\
> + )\
> + )\
> + )\
> + )\
> + )\
> + )\
> + )
Seems like a replication of information already calculated in configure
and prone to breakage if we add a new one (or come up with some franken
architecture at a later date).
--
Alex Bennée
- [PATCH v6 00/11] accel: Allow targets to use Kconfig, Philippe Mathieu-Daudé, 2020/06/05
- [PATCH v6 01/11] MAINTAINERS: Fix KVM path expansion glob, Philippe Mathieu-Daudé, 2020/06/05
- [PATCH v6 02/11] MAINTAINERS: Add an 'overall' entry for accelerators, Philippe Mathieu-Daudé, 2020/06/05
- [PATCH v6 03/11] MAINTAINERS: Add an entry for the HAX accelerator, Philippe Mathieu-Daudé, 2020/06/05
- [PATCH v6 04/11] rules.mak: Add strequal() and startwith() rules, Philippe Mathieu-Daudé, 2020/06/05
- [PATCH v6 05/11] rules.mak: Add base-arch() rule, Philippe Mathieu-Daudé, 2020/06/05
- Re: [PATCH v6 05/11] rules.mak: Add base-arch() rule,
Alex Bennée <=
- [PATCH v6 06/11] Makefile: Remove dangerous EOL trailing backslash, Philippe Mathieu-Daudé, 2020/06/05
- [PATCH v6 07/11] Makefile: Write MINIKCONF variables as one entry per line, Philippe Mathieu-Daudé, 2020/06/05
- [PATCH v6 08/11] accel/Kconfig: Extract accel selectors into their own config, Philippe Mathieu-Daudé, 2020/06/05
- [PATCH v6 09/11] accel/Kconfig: Add the TCG selector, Philippe Mathieu-Daudé, 2020/06/05
- [PATCH v6 10/11] Makefile: Allow target-specific optional Kconfig, Philippe Mathieu-Daudé, 2020/06/05