Cmake 找不到创建的库 (libgps）

Cmake does not find created library (libgps)

本文关键字：libgps 找不到 创建 Cmake      更新时间：2023-10-16

我为 libgps 创建了一个 cmake 文件(cmake File(。这工作正常，libgps.a/libgps.so(尝试两者(将被放置在/usr/local/lib 中。当我尝试使用此库时，我收到 cmake 消息，指出找不到该库。我可以检查什么来找出它不起作用的原因？

这里是 libgps 的 cmake 代码：

cmake_minimum_required(VERSION 2.6)
set(PROJECT_NAME position_logger)
set(CMAKE_TOOLCHAIN_FILE ${CMAKE_CURRENT_SOURCE_DIR}/../RPiToolchainCmake/toolchain-rpi.cmake) # must be before project()
project(${PROJECT_NAME})

add_library(gps STATIC "")
#add_library(gps SHARED "")
target_link_libraries(gps m)
target_include_directories(gps PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/src)
target_sources(gps PUBLIC 
${CMAKE_CURRENT_SOURCE_DIR}/src/gps.h
${CMAKE_CURRENT_SOURCE_DIR}/src/nmea.h
${CMAKE_CURRENT_SOURCE_DIR}/src/serial.h)
target_sources(gps PRIVATE 
${CMAKE_CURRENT_SOURCE_DIR}/src/gps.c
${CMAKE_CURRENT_SOURCE_DIR}/src/nmea.c
${CMAKE_CURRENT_SOURCE_DIR}/src/serial.c)
add_executable(${PROJECT_NAME} examples/position_logger.c)
target_link_libraries(${PROJECT_NAME} gps)
install(TARGETS gps DESTINATION /usr/local/lib)
#install(TARGETS ${PROJECT_NAME} RUNTIME DESTINATION bin)

工具链-rpi.cmake 包含交叉编译器的路径

# Define our host system
SET(CMAKE_SYSTEM_NAME Linux)
SET(CMAKE_SYSTEM_VERSION 1)
# Define the cross compiler locations
SET(CMAKE_C_COMPILER    ${CMAKE_CURRENT_LIST_DIR}/../RaspCompiler/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin/arm-linux-gnueabihf-gcc)
SET(CMAKE_CXX_COMPILER  ${CMAKE_CURRENT_LIST_DIR}/../RaspCompiler/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin/arm-linux-gnueabihf-g++)
# Define the sysroot path for the RaspberryPi distribution in our tools folder 
#SET(CMAKE_FIND_ROOT_PATH    ${CMAKE_CURRENT_LIST_DIR}/../../RaspCompiler/arm-    bcm2708/arm-rpi-4.9.3-linux-gnueabihf/sysroot/)
# Use our definitions for compiler tools
SET(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
# Search for libraries and headers in the target directories only
SET(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
SET(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)

这是我的测试程序的cmake：

cmake_minimum_required(VERSION 2.6)
set(PROJECT_NAME GPS_Program)
set(CMAKE_TOOLCHAIN_FILE ${CMAKE_CURRENT_SOURCE_DIR}/../../RPiToolchainCmake/toolchain-rpi.cmake) # must be before project()
project(${PROJECT_NAME})

# libgps -- Begin
set(GPS_INCLUDE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../../libgps/src)
set(LIBGPS_PATH /usr/local/lib)
find_library(GPS_LIBRARY 
NAMES libgps 
PATHS ${LIBGPS_PATH}
NO_DEFAULT_PATH)
if (NOT ${GPS_LIBRARY})
message(FATAL_ERROR "LIBGPS not found in: ${LIBGPS_PATH} . Install     libgps(Software/libgps)")
else()
message("LIBGPS_LIBRARY FOUND: " ${LIBGPS_PATH})
endif()
# libgps -- End
include_directories (include ${GPS_INCLUDE_DIR})
FILE(GLOB SRC_FILES src/main.cpp)
add_executable(${PROJECT_NAME} ${SRC_FILES})
#install(TARGETS ${PROJECT_NAME} RUNTIME DESTINATION bin)
target_link_libraries(${PROJECT_NAME} ${GPS_LIBRARY})

问题是，libgps 将找不到。我每次收到消息时，都找不到libgps：

CMake Error at CMakeLists.txt:17 (message):
LIBGPS not found in: /usr/local/lib .  Install libgps(Software/libgps)

我检查了程序和库是否使用相同的编译器编译。 我还添加了

#ifdef __cplusplus
extern "C"{
#endif

到 gps.h 文件

将 libgps 更改为 gps 并且从下面的 cmake 更改工作正常后。

我以为我必须从GPS_LIBRARY那里获得价值。但这就是问题所在。

错了：

if (NOT ${GPS_LIBRARY})
message("LIBGPS not found in: ${GPS_LIBRARY} . Install libgps(Software/libgps)")
else()
message("LIBGPS_LIBRARY FOUND: " ${LIBGPS_PATH})
endif()

正确：

if (NOT GPS_LIBRARY)
message("LIBGPS not found in: ${GPS_LIBRARY} . Install libgps(Software/libgps)")
else()
message("LIBGPS_LIBRARY FOUND: " ${LIBGPS_PATH})
endif()
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