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dtc: Use pkg-config to locate libyaml

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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>
This commit is contained in:
Pavel Modilaynen 2019-07-12 13:52:19 +02:00 committed by Rob Herring
parent 1ee1ffe1f0
commit 067c650c45
1 changed files with 2 additions and 2 deletions
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4
scripts/dtc/Makefile
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@ -11,7 +11,7 @@ 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 ($(wildcard /usr/include/yaml.h),)
ifeq ($(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.)
@ -19,7 +19,7 @@ endif
HOST_EXTRACFLAGS += -DNO_YAML
else
dtc-objs += yamltree.o
HOSTLDLIBS_dtc := -lyaml
HOSTLDLIBS_dtc := $(shell pkg-config yaml-0.1 --libs)
endif
# Generated files need one more search path to include headers in source tree