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Pavel Modilaynen 067c650c45 dtc: Use pkg-config to locate libyaml

Using Makefile's wildcard with absolute path to detect
the presence of libyaml results in false-positive
detection when cross-compiling e.g. in yocto environment.
The latter results in build error:
| scripts/dtc/yamltree.o: In function `yaml_propval_int':
| yamltree.c: undefined reference to `yaml_sequence_start_event_initialize'
| yamltree.c: undefined reference to `yaml_emitter_emit'
| yamltree.c: undefined reference to `yaml_scalar_event_initialize'
...
Use pkg-config to locate libyaml to address this scenario.

Signed-off-by: Pavel Modilaynen <pavel.modilaynen@axis.com>
[robh: silence stderr]
Signed-off-by: Rob Herring <robh@kernel.org>

2019-11-04 11:21:07 -06:00

1018 B

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SPDX-License-Identifier: GPL-2.0

scripts/dtc makefile

hostprogs-$(CONFIG_DTC) := dtc always := $(hostprogs-y)

dtc-objs := dtc.o flattree.o fstree.o data.o livetree.o treesource.o
srcpos.o checks.o util.o dtc-objs += dtc-lexer.lex.o dtc-parser.tab.o

Source files need to get at the userspace version of libfdt_env.h to compile

HOST_EXTRACFLAGS := -I $(srctree)/$(src)/libfdt

ifeq ($(shell pkg-config --exists yaml-0.1 2>/dev/null && echo yes),) ifneq ($(CHECK_DTBS),) $(error dtc needs libyaml for DT schema validation support.
Install the necessary libyaml development package.) endif HOST_EXTRACFLAGS += -DNO_YAML else dtc-objs += yamltree.o HOSTLDLIBS_dtc := $(shell pkg-config yaml-0.1 --libs) endif

Generated files need one more search path to include headers in source tree

HOSTCFLAGS_dtc-lexer.lex.o := -I $(srctree)/$(src) HOSTCFLAGS_dtc-parser.tab.o := -I $(srctree)/$(src)

dependencies on generated files need to be listed explicitly

$(obj)/dtc-lexer.lex.o: $(obj)/dtc-parser.tab.h

1018 B Raw Blame History