Linux ld 如何解释 -lSomething::AnotherSomething(如 /usr/bin/ld: 找
how linux ld interprets -lSomething::AnotherSomething (like /usr/bin/ld: cannot find -lQt5::Widgets)
我从CMakeLists收到此错误.txt：
/usr/bin/ld: cannot find -lQt5::Widgets
我试过做
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/home/user/Qt/5.12.6/gcc_64/lib
并再次运行 make，但我收到同样的错误。/home/user/Qt/5.12.6/gcc_64/lib具有以下文件(以及更多文件(：
libQt5Widgets.la
libQt5Widgets.prl
libQt5Widgets.so
libQt5Widgets.so.5
libQt5Widgets.so.5.12
libQt5Widgets.so.5.12.6
libQt5Widgets.so.5.12.6.debug
当你这样做时，ld 会搜索什么：-lQt5::Widgets？我只能想象它在寻找libQt5Widgets.x
更新：
project(QuanergyClient)
cmake_minimum_required(VERSION 2.8)
# This should match what's in include/quanergy/client/version.h
set(QUANERGY_CLIENT_VERSION "3.3.2")
#required to prevent macro definition of min and max in windows
add_definitions(-DNOMINMAX)
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
option(NoViz "Do not build visualizer" OFF)
if(CMAKE_COMPILER_IS_GNUCXX)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -Wno-unknown-pragmas -fno-strict-aliasing -Wno-format-extra-args -Wno-sign-compare -Wno-invalid-offsetof -Wno-conversion")
endif()
# Offer the user the choice of overriding the installation directories
set(INSTALL_LIB_DIR lib CACHE PATH "Installation directory for libraries")
set(INSTALL_BIN_DIR bin CACHE PATH "Installation directory for executables")
set(INSTALL_INCLUDE_DIR include CACHE PATH "Installation directory for header files")
set(INSTALL_CMAKE_DIR share/${PROJECT_NAME} CACHE PATH "Installation directory for CMake files")
option(PACKAGE_FOR_DEV "Create -dev package" ON)
option(BUILD_APPS "Build applications" OFF)
# Make relative paths absolute (needed later on)
foreach(p LIB BIN INCLUDE CMAKE)
set(var INSTALL_${p}_DIR)
if(NOT IS_ABSOLUTE "${${var}}")
set(${var} "${CMAKE_INSTALL_PREFIX}/${${var}}")
endif()
endforeach()
SET(CMAKE_SKIP_BUILD_RPATH FALSE)
SET(CMAKE_BUILD_WITH_INSTALL_RPATH FALSE)
SET(CMAKE_INSTALL_RPATH "${INSTALL_LIB_DIR}")
SET(CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE)
LIST(FIND CMAKE_PLATFORM_IMPLICIT_LINK_DIRECTORIES "${INSTALL_LIB_DIR}" is_system_dir)
IF("${is_system_dir}" STREQUAL "-1")
SET(CMAKE_INSTALL_RPATH "${INSTALL_LIB_DIR}")
ENDIF("${is_system_dir}" STREQUAL "-1")
find_package(Boost COMPONENTS system thread REQUIRED)
if (NoViz OR CMAKE_CROSSCOMPILING)
find_package(PCL REQUIRED common io)
else()
find_package(PCL REQUIRED common io visualization)
endif()
file(GLOB_RECURSE project_HEADERS
"*.h"
"*.hpp"
)
#message(STATUS "LIBS: ${Boost_INCLUDE_DIR} ${PCL_INCLUDE_DIRS}")
#message(STATUS "PCL LIBRARIES: ${PCL_LIBRARIES}")
include_directories(
include
${Boost_INCLUDE_DIR}
${PCL_INCLUDE_DIRS})
link_directories(
${Boost_LIBRARY_DIR}
${PCL_LIBRARY_DIRS})
add_definitions(${PCL_DEFINITIONS})
set(client_SRCS
src/modules/polar_to_cart_converter.cpp
src/modules/distance_filter.cpp
src/modules/ring_intensity_filter.cpp
src/modules/encoder_angle_calibration.cpp
src/common/point_xyz.cpp
src/common/point_xyzir.cpp
src/parsers/data_packet_parser_00.cpp
src/parsers/data_packet_parser_01.cpp
src/parsers/data_packet_parser_04.cpp
src/parsers/data_packet_parser_m8.cpp
${project_HEADERS}
)
add_library(quanergy_client SHARED ${client_SRCS})
if(WIN32)
target_link_libraries(quanergy_client ws2_32 ${Boost_LIBRARIES})
endif()
configure_file(doxyfile.in
"${PROJECT_BINARY_DIR}/doxyfile" @ONLY)
#############
## Testing ##
#############
# Unit Tests
find_package(GTest)
if (GTEST_FOUND)
add_executable(test_quanergy_client test/test_encoder_angle_calibration.cpp)
target_link_libraries(test_quanergy_client
quanergy_client
${GTEST_LIBRARIES}
boost_system
)
add_test(encoder_calibration_unit_test test_quanergy_client)
endif()
find_package(Doxygen)
if(DOXYGEN_FOUND)
add_custom_target(doc "${DOXYGEN_EXECUTABLE}" "${PROJECT_BINARY_DIR}/doxyfile")
endif(DOXYGEN_FOUND)
# This is the export CMake stuff form.
if (PACKAGE_FOR_DEV)
install(DIRECTORY include/quanergy
DESTINATION "${INSTALL_INCLUDE_DIR}" COMPONENT dev)
if(WIN32)
install(TARGETS quanergy_client
EXPORT QuanergyClientTargets
RUNTIME DESTINATION "${INSTALL_LIB_DIR}" COMPONENT shlib)
else()
install(TARGETS quanergy_client
EXPORT QuanergyClientTargets
LIBRARY DESTINATION "${INSTALL_LIB_DIR}" COMPONENT shlib)
endif()
else()
set_target_properties(quanergy_client
PROPERTIES SOVERSION ${QUANERGY_CLIENT_VERSION})
if(WIN32)
install(TARGETS quanergy_client
EXPORT QuanergyClientTargets
RUNTIME DESTINATION "${INSTALL_LIB_DIR}" COMPONENT shlib NAMELINK_SKIP)
else()
install(TARGETS quanergy_client
EXPORT QuanergyClientTargets
LIBRARY DESTINATION "${INSTALL_LIB_DIR}" COMPONENT shlib NAMELINK_SKIP)
endif()
endif()
# Add all targets to the build-tree export set
export(TARGETS quanergy_client FILE "${PROJECT_BINARY_DIR}/QuanergyClientTargets.cmake")
# Export the package for use from the build-tree
# (this registers the build-tree with a global CMake-registry)
# Which of these is correct? The latter follows the pattern set by
# quanergy_core.
# export(PACKAGE QuanergyClient)
export(PACKAGE quanergy_client)
# Create the QuanergyClientConfig.cmake and QuanergyClientConfigVersion files
file(RELATIVE_PATH REL_INCLUDE_DIR "${INSTALL_CMAKE_DIR}" ${INSTALL_INCLUDE_DIR})
# ... for the build tree
set(CONF_INCLUDE_DIRS "${PROJECT_SOURCE_DIR}/include")
configure_file(cmake/QuanergyClientConfig.cmake.in
"${PROJECT_BINARY_DIR}/QuanergyClientConfig.cmake" @ONLY)
# ... for the install tree
set(CONF_INCLUDE_DIRS "${QUANERGY_CLIENT_CMAKE_DIR}/${REL_INCLUDE_DIR}" "${PCL_INCLUDE_DIRS}")
configure_file(cmake/QuanergyClientConfig.cmake.in
"${PROJECT_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/QuanergyClientConfig.cmake" @ONLY)
# ... for both
configure_file(cmake/QuanergyClientConfigVersion.cmake.in
"${PROJECT_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/QuanergyClientConfigVersion.cmake" @ONLY)
if (PACKAGE_FOR_DEV)
# Install the QuanergyClientConfig.cmake and QuanergyClientConfigVersion.cmake
message("config: ${PROJECT_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/QuanergyClientConfig.cmake")
install(FILES
"${PROJECT_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/QuanergyClientConfig.cmake"
"${PROJECT_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/QuanergyClientConfigVersion.cmake"
DESTINATION "${INSTALL_CMAKE_DIR}" COMPONENT dev)
install(EXPORT QuanergyClientTargets DESTINATION "${INSTALL_CMAKE_DIR}" COMPONENT dev)
endif()
set(CPACK_GENERATOR "DEB")
if(PACKAGE_FOR_DEV)
set(CPACK_PACKAGE_FILE_NAME "quanergy-client-${QUANERGY_CLIENT_VERSION}-dev")
set(CPACK_DEBIAN_PACKAGE_NAME "quanergy-client-dev")
set(CPACK_DEBIAN_PACKAGE_DESCRIPTION "Quanergy client library - development")
set(CPACK_DEBIAN_PACKAGE_SECTION libdevel)
set(CPACK_DEBIAN_PACKAGE_DEPENDS "libpcl-common-1.7-dev (>= 1.7.0), libpcl-io-1.7-dev (>= 1.7.0), libboost-dev (>= 1.54), libboost-system1.54.0, quanergy-client")
configure_file(debian/postinst-dev.in "${PROJECT_BINARY_DIR}/postinst")
configure_file(debian/preinst-dev.in "${PROJECT_BINARY_DIR}/preinst")
configure_file(debian/postrm-dev.in "${PROJECT_BINARY_DIR}/postrm")
set(CPACK_DEBIAN_PACKAGE_CONTROL_EXTRA "${PROJECT_BINARY_DIR}/preinst;${PROJECT_BINARY_DIR}/postinst;${PROJECT_BINARY_DIR}/postrm;")
else()
set(CPACK_PACKAGE_FILE_NAME "quanergy-client-${QUANERGY_CLIENT_VERSION}")
set(CPACK_DEBIAN_PACKAGE_NAME "quanergy-client")
set(CPACK_DEBIAN_PACKAGE_DESCRIPTION "Quanergy client library - runtime")
set(CPACK_DEBIAN_PACKAGE_SECTION libs)
set(CPACK_DEBIAN_PACKAGE_DEPENDS "quanergy-client (>= 0.1.0), libpcl-common-1.7 (>= 1.7.0), libpcl-io-1.7 (>= 1.7.0), libboost-system1.54.0")
configure_file(debian/postinst.in "${PROJECT_BINARY_DIR}/postinst")
configure_file(debian/prerm.in "${PROJECT_BINARY_DIR}/prerm")
set(CPACK_DEBIAN_PACKAGE_CONTROL_EXTRA "${PROJECT_BINARY_DIR}/postinst;${PROJECT_BINARY_DIR}/prerm;")
endif()
set(CPACK_DEBIAN_PACKAGE_MAINTAINER "Quanergy Systems Inc.") #required
set(CPACK_DEBIAN_PACKAGE_VERSION ${QUANERGY_CLIENT_VERSION})
if ("x86_64-linux-gnu" STREQUAL "${CMAKE_LIBRARY_ARCHITECTURE}")
set(CPACK_DEBIAN_PACKAGE_ARCHITECTURE "amd64")
else()
set(CPACK_DEBIAN_PACKAGE_ARCHITECTURE "i386")
endif()
include(CPack)
##########
# apps #
##########
if (PCL_VISUALIZATION_FOUND)
add_executable(visualizer apps/visualizer.cpp apps/visualizer_module.cpp)
target_link_libraries(visualizer quanergy_client ${PCL_LIBRARIES} ${Boost_LIBRARIES})
endif()
add_executable(dynamic_connection apps/dynamic_connection.cpp)
target_link_libraries(dynamic_connection quanergy_client ${PCL_LIBRARIES} ${Boost_LIBRARIES})
message("PCL_LIBRARIES: ${PCL_LIBRARIES}")
message("Boost_LIBRARIES: ${PCL_LIBRARIES}")
这是错误：
/usr/bin/ld: cannot find -lQt5::Widgets
collect2: error: ld returned 1 exit status
CMakeFiles/dynamic_connection.dir/build.make:345: recipe for target 'dynamic_connection' failed
make[2]: *** [dynamic_connection] Error 1
make[2]: Leaving directory '/home/user/QubesIncoming/social/quanergy_client-master'
CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/dynamic_connection.dir/all' failed
make[1]: *** [CMakeFiles/dynamic_connection.dir/all] Error 2
make[1]: Leaving directory '/home/user/QubesIncoming/social/quanergy_client-master'
Makefile:149: recipe for target 'all' failed
make: *** [all] Error 2
我找不到一行它说了关于Qt5的任何内容。我什至打印了与dynamic_connection链接相关的变量，那里没有 Qt5。
它将 lib 放在前面并查找以.a或.so结尾的文件。您的命令将查找libQt5::Widgets.so或libQt5::Widgets.a。您应该改用-lQt5Widgets。
请注意，LD_LIBRARY_PATH对链接器没有影响，它仅在运行时查找共享库时使用(如果在可执行文件中正确使用 rpath，则也不需要(。您可能想要LIBRARY_PATH。
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