I am using an external project to download and build a third-party library
from GitHub. This works fine, except that every time, I run make, the
configure and build parts of the external project run, even though nothing
has changed. Here is the relevant CMake code:
=================================
include(ExternalProject)
set(JEMALLOC_PREFIX_DIR ${CMAKE_BINARY_DIR}/Jemalloc)
set(JEMALLOC_SRC_DIR ${JEMALLOC_PREFIX_DIR}/src/Jemalloc)
set(JEMALLOC_INSTALL_DIR ${JEMALLOC_PREFIX_DIR}/install)
ExternalProject_Add(Jemalloc
GIT_REPOSITORY https://github.com/jemalloc/jemalloc.git
GIT_TAG master
PREFIX ${JEMALLOC_PREFIX_DIR}
CONFIGURE_COMMAND echo Configuring jemalloc
&& cd ${JEMALLOC_SRC_DIR}
&& ./autogen.sh && ./configure
--prefix=${JEMALLOC_INSTALL_DIR} --with-jemalloc-prefix=je_ --enable-prof
BUILD_COMMAND echo Building jemalloc && cd ${JEMALLOC_SRC_DIR}
&& make install_lib_static install_include
INSTALL_COMMAND ""
)
# Create libjemalloc and libjemalloc-pic targets to be used as
# dependencies
add_library(libjemalloc STATIC IMPORTED GLOBAL)
add_library(libjemalloc-pic STATIC IMPORTED GLOBAL)
set_target_properties(libjemalloc PROPERTIES
"IMPORTED_LOCATION" "${JEMALLOC_INSTALL_DIR}/lib/libjemalloc.a")
set_target_properties(libjemalloc-pic PROPERTIES
"IMPORTED_LOCATION" "${JEMALLOC_INSTALL_DIR}/lib/libjemalloc-pic.a")
# Make the targets depend on the external project download.
add_dependencies(libjemalloc Jemalloc)
add_dependencies(libjemalloc-pic Jemalloc)
# Export the include directory path.
set(JEMALLOC_INCLUDE_DIR ${JEMALLOC_INSTALL_DIR}/include)
=================================
When I run this for the first time, the library code is pulled from Git and
built. The second time around, I see this:
[ 13%] Performing update step for 'Jemalloc'
Current branch master is up to date.
[ 18%] Performing configure step for 'Jemalloc'
Configuring jemalloc
autoconf
./configure --enable-autogen
I really don't want anything to be rebuilt if there are no changes in the
source repository. What am I doing wrong?
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