您好,基本上我正在尝试使用来自 here 的 svm .它是用 C 编写的,并给出了如何在 C++ 中使用它的说明:
- Compile "svm_learn.c", "svm_common.c", and "svm_hideo.c" as
C code.The C++ program you want to call svm_learn/8 and classify_example/2 (or classify_example_linear/2) from needs to include the following headers:
extern "C" { # include "svm_common.h" # include "svm_learn.h" }
Link "svm_learn.o", "svm_common.o", and "svm_hideo.o" to your program.
所以我编译了上述文件并获得了所需的 .o 文件。 比我补充的:
SET( svm_lib_light_obj
E:\framework\svm_light\build\svm_learn.o
E:\framework\svm_light\build\svm_common.o
E:\framework\svm_light\build\svm_hideo.o
)
ADD_LIBRARY(
svm_lib_light
STATIC
EXCLUDE_FROM_ALL
${svm_lib_light_obj}
)
SET_SOURCE_FILES_PROPERTIES(
${svm_lib_light_obj}
PROPERTIES
EXTERNAL_OBJECT true # to say that "this is actually an object file, so it should not be compiled, only linked"
GENERATED true # to say that "it is OK that the obj-files do not exist before build time"
)
SET_TARGET_PROPERTIES(
svm_lib_light
PROPERTIES
LINKER_LANGUAGE C # Or else we get an error message, because cmake can't figure out from the ".o"-suffix that it is a C-linker we need.
ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/lib
)
所以现在我只需要包含提到的 .h 文件。我将它们添加到我的其他源文件中:
ADD_EXECUTABLE ( MYProgramm
...
#other source files
...
src/svm_common.h
src/svm_learn.h
)
不幸的是,它不起作用。从这些 .h 文件调用任何函数会导致链接器错误 LNK2001、LNK1120。 我猜我必须告诉 cmake 这些 .h 文件是 .o 文件的前端。但是如何呢?
最佳答案
最好的方法是将这些 C 文件添加到您的项目中:
SET(SVM_LIGHT_SRC_DIR "E:/framework/svm_light")
INCLUDE_DIRECTORIES(${SVM_LIGHT_SRC_DIR})
ADD_LIBRARY(
svm_lib_light
${SVM_LIGHT_SRC_DIR}/svm_learn.c
${SVM_LIGHT_SRC_DIR}/svm_common.c
${SVM_LIGHT_SRC_DIR}/svm_hideo.c
)
ADD_EXECUTABLE ( MYProgramm
...
#other source files
...
)
TARGET_LINK_LIBRARIES(MYProgram svm_lib_light)
关于c++ - CMAKE 链接外部 c 库,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/4786861/