Yocto Recipe中通过postinstall解决交叉编译ARM二进制执行兼容问题

Let’s walk through each of your questions with clear, actionable solutions tailored to your Yocto and Makefile setup:

1. Modified Makefile (Removing the json Target) #

The json target relies on your ARM-built analyzer binary, which can’t run on an x86 host—so we’ll strip out all related code. Here’s the cleaned-up Makefile:

TARGETDIR=../rel/$(PLATFORM)
ANALYZER=$(TARGETDIR)/analyzer
TARGETS=$(ANALYZER)

all: $(TARGETS)

$(ANALYZER): analyzer.c pgn.c analyzer.h pgn.h ../common/common.c ../common/common.h Makefile
	$(CC) $(CPPFLAGS) $(CFLAGS) $(LDFLAGS) -o $(ANALYZER) -I../common pgn.c analyzer.c ../common/common.c $(LDLIBS$(LDLIBS-$(@)))

We removed:

• The JSONFILE and XMLFILE variables (only used by the json target)
• The entire json target rule

2. Do I need to add DEPENDS = "libxslt libxml2"? #

No, you don’t need this in DEPENDS—here’s why:

• DEPENDS specifies build-time dependencies (libraries/tools needed to compile your code). Your analyzer binary doesn’t link against libxml2 or libxslt, so these aren’t required for compilation.
• Instead, you need to add libxslt to RDEPENDS_${PN} (runtime dependencies), since the target device will need xsltproc (provided by libxslt) to convert the XML to JSON during installation.

3. Do I need to add RDEPENDS_${PN} = "bash"? #

Only if your post-install script uses bash-specific syntax.
Yocto’s default shell on target devices is a POSIX-compliant /bin/sh (usually busybox sh or dash). If your script only uses standard shell features (simple commands, pipes, redirection), bash isn’t needed. Reserve this dependency only if you use bash-exclusive tools like arrays, [[ ]] conditionals, or shopt settings.

4. Writing the Target Device Post-Install Script #

We’ll use Yocto’s pkg_postinst_${PN} hook, which runs on the target device when the package is installed. First, update your Recipe to install the XSLT script and define the post-install logic:

SUMMARY = "CANBOAT"
SECTION = "base"
LICENSE = "GPLv3"
LIC_FILES_CHKSUM = "file://GPL;md5=05507c6da2404b0e88fe5a152fd12540"
S = "${WORKDIR}/git"
SRC_URI = "git://github.com/canboat/canboat.git;branch=${SRCBRANCH}"
SRCBRANCH = "master"
SRCREV = "93b2ebfb334d7a9750b6947d3a4af9b091be2432"
EXTRA_OEMAKE = "'CC=${CC}' 'AR=${AR}'"

# Runtime dependency: target needs xsltproc for XML->JSON conversion
RDEPENDS_${PN} += "libxslt"

do_compile() {
	oe_runmake
}

do_install() {
	oe_runmake install
	# Install the XSLT script to a shared directory on the target
	install -d ${D}${datadir}/canboat/
	install -m 0644 ${S}/pgns2json.xslt ${D}${datadir}/canboat/
}

# This script executes on the target device during package installation
pkg_postinst_${PN}() {
	#!/bin/sh
	set -e

	# Define paths on the target (adjust analyzer path if your make install uses a different location)
	ANALYZER="/usr/bin/analyzer"
	XSLT_SCRIPT="/usr/share/canboat/pgns2json.xslt"
	TEMP_XML="/tmp/pgns.xml"
	FINAL_JSON="/usr/share/canboat/pgns.json"

	# Generate XML, convert to JSON, clean up
	${ANALYZER} -explain-xml > ${TEMP_XML}
	xsltproc ${XSLT_SCRIPT} ${TEMP_XML} > ${FINAL_JSON}
	rm -f ${TEMP_XML}

	# Set correct permissions for the JSON file
	chmod 0644 ${FINAL_JSON}
}

Key details:

• do_install adds the pgns2json.xslt script to the target’s shared directory so the post-install script can access it.
• pkg_postinst_${PN} runs on the target, using the native ARM analyzer binary to generate XML, then xsltproc to convert it to JSON. We use a temporary XML file to avoid clutter.
• Double-check the ANALYZER path: if your make install puts the binary somewhere other than /usr/bin/, update this accordingly.

内容的提问来源于stack exchange，提问作者user4851126