Digi embedded yocto: Why is executable generated by CMake recipe larger than compiling by gcc

Embedded Devices Linux
1

I have a simple CMake recipe like this:

###########################
SUMMARY = “Simple helloworld cmake application”
SECTION = “examples”
LICENSE = “MIT”
LIC_FILES_CHKSUM = “file://${COMMON_LICENSE_DIR}/MIT;md5=0835ade698e0bcf8506ecda2f7b4f302”

SRC_URI = “file://CMakeLists.txt
file://helloworld.c”

S = “${WORKDIR}”
inherit cmake
EXTRA_OECMAKE = “”
##########################

and the content of the CMakelists.txt is:

##########################
cmake_minimum_required(VERSION 2.8.10)

project(“Test” C)

add_executable(HelloWorldCMake helloworld.c)

install(TARGETS HelloWorldCMake RUNTIME DESTINATION bin)
##########################

I have another recipe does the same thing but i don’t use CMake

##########################
SUMMARY = “Simple helloworld application”
SECTION = “examples”
LICENSE = “MIT”
LIC_FILES_CHKSUM = “file://${COMMON_LICENSE_DIR}/MIT;md5=0835ade698e0bcf8506ecda2f7b4f302”

SRC_URI = “file://helloworld.c”

S = “${WORKDIR}”

TARGET_CC_ARCH += “${LDFLAGS}”

do_compile() {
${CC} helloworld.c -o helloworld
}

do_install() {
install -d ${D}${bindir}
install -m 0755 helloworld ${D}${bindir}
}
##########################

Both recipes compile and install successfully but the executable generated by CMake recipe is much larger than that of the normal recipe.

2

perhaps optimization is not enabled:
https://cmake.org/Wiki/CMake_Performance_Tips

3

Following the instructions, I add this line before inheriting cmake:

EXTRA_OECMAKE += “-DCMAKE_BUILD_TYPE=Release”

And still get the same reusult