4ba77a661f
The current Makefile for the ulib examples is not very easy to modify. Split it into three parts: - config.mk containing the variables used by the build tools - a list of programs and the objects in each one - rules.mk with some rules to make it all work Use sys-objs to indicate objects which should be built with system headers. Use U-Boot headers by default. With this it is fairly simply to add a new program. Of course we could make use of U-Boot's kbuild implementation to tidy this up, but the purpose of the examples is to show how to do things outside the U-Boot build system. Co-developed-by: Claude <noreply@anthropic.com> Co-developed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Simon Glass <sjg@chromium.org>
48 lines
1.5 KiB
Makefile
48 lines
1.5 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0+
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#
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# Configuration and helpers for U-Boot library examples
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#
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# Copyright 2025 Canonical Ltd.
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# Written by Simon Glass <simon.glass@canonical.com>
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# For standalone builds, provide default values
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EXAMPLE_DIR ?= .
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OUTDIR ?= .
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CC ?= gcc
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SDL_CONFIG ?= sdl2-config
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PLATFORM_LIBS ?= $(shell $(SDL_CONFIG) --libs)
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LIB_STATIC_LDS ?= static.lds
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# The main Makefile passes in Q=@ for quiet output
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Q ?=
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# Common compiler flags for programs using system headers
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SYSTEM_CFLAGS := -I$(UBOOT_BUILD)/include \
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-idirafter$(srctree)/include \
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-include $(srctree)/include/linux/compiler_attributes.h
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# Common compiler flags for programs using U-Boot headers (these match the
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# U-Boot internal build)
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UBOOT_CFLAGS := -nostdinc \
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-isystem $(shell $(CC) -print-file-name=include) \
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-I$(UBOOT_BUILD)/include \
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-I$(srctree)/include \
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-I$(srctree)/arch/sandbox/include \
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-include $(UBOOT_BUILD)/include/config.h \
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-include $(srctree)/include/linux/kconfig.h \
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-I$(srctree)/dts/upstream/include \
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"-DMBEDTLS_CONFIG_FILE=\"mbedtls_def_config.h\"" \
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-I$(srctree)/lib/mbedtls \
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-I$(srctree)/lib/mbedtls/port \
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-I$(srctree)/lib/mbedtls/external/mbedtls \
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-I$(srctree)/lib/mbedtls/external/mbedtls/include \
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-Wno-builtin-declaration-mismatch \
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-D__KERNEL__ -DCONFIG_SYS_TEXT_BASE=0
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# Linking flags
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SHARED_LDFLAGS := -L$(UBOOT_BUILD) -lu-boot -Wl,-rpath,$(UBOOT_BUILD)
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STATIC_LDFLAGS := -Wl,-T,$(LIB_STATIC_LDS) \
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-Wl,--whole-archive $(UBOOT_BUILD)/libu-boot.a \
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-Wl,--no-whole-archive \
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-lpthread -ldl $(PLATFORM_LIBS) -Wl,-z,noexecstack
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