用cmake編譯和添加二進制目標文件

Question

我正在用C++編寫一個excel文件生成器。

我有我需要的一切工作，但我仍然依靠一個外部空的xlsx文件，我解壓縮，遍歷並根據需要添加數據以創建最終文件。

我想要做的是通過轉動XLSX文件轉換成二進制BLOB在我的可執行文件的.RODATA部分消除這種依賴關係，首先把它變成一個目標文件像這樣：

$ ld -r -b binary -o template.o template.xlsx 
$ objcopy --rename-section .data=.rodata,alloc,load,readonly,data,contents template.o template.o 

我從這裏得到這個信息：http://www.burtonini.com/blog/computers/ld-blobs-2007-07-13-15-50

第二步是將它鏈接到二進制文件，我可以用ld做。

我的問題是，如何使用cmake自動執行這兩個步驟？我不知道ATM如何運行，如LD一個以上的第一步具體的命令，我已經嘗試添加文件/ template.o我target_link_libraries第二，但LD只是說

/usr/bin/ld: cannot find -lfiles/template.o 

編輯：

添加以下自定義命令我的CMakeLists.txt：

add_custom_command(OUTPUT files/template.o 
     COMMAND ld -r -b binary -o files/template.o files/template.xlsx 
     COMMAND objcopy --rename-section .data=.rodata,alloc,load,readonly,data,contents files/template.o files/template.o) 

和添加的文件/ template.o到add_executable通話。

不幸的是，cmake的這樣說：

ld: cannot open output file files/template.o: No such file or directory 

這是我的理解是，在add_custom_command輸出指令讓我們來告訴CMake的正在由命令命令創建的內容文件。所以我現在有點困惑。

編輯2：

我更新了的CMakeLists.txt，並增加了一個目標，以確保模板文件有內置：

add_custom_target(run ALL 
    DEPENDS template.o) 

和依賴關係，以確保它被前建成在excelbuilder目標：

add_dependencies(excelbuilder run) 

我也更新了自定義命令看起來像這樣：

add_custom_command(OUTPUT template.o 
     COMMAND ld -r -b binary -o template.o ${CMAKE_CURRENT_SOURCE_DIR}/files/template.xlsx 
     COMMAND objcopy --rename-section .data=.rodata,alloc,load,readonly,data,contents template.o template.o) 

當運行此，輸出是如下（使VERBOSE = 1）

$ make VERBOSE=1 
/usr/bin/cmake -H/home/ravloony/projects/excelparser -B/home/ravloony/projects/excelparser/build --check-build-system CMakeFiles/Makefile.cmake 0 
/usr/bin/cmake -E cmake_progress_start /home/ravloony/projects/excelparser/build/CMakeFiles /home/ravloony/projects/excelparser/build/CMakeFiles/progress.marks 
make -f CMakeFiles/Makefile2 all 
make[1]: Entering directory `/home/ravloony/projects/excelparser/build' 
make -f src/lib/minizip/CMakeFiles/minizip_1-1.dir/build.make src/lib/minizip/CMakeFiles/minizip_1-1.dir/depend 
make[2]: Entering directory `/home/ravloony/projects/excelparser/build' 
cd /home/ravloony/projects/excelparser/build && /usr/bin/cmake -E cmake_depends "Unix Makefiles" /home/ravloony/projects/excelparser /home/ravloony/projects/excelparser/src/lib/minizip /home/ravloony/projects/excelparser/build /home/ravloony/projects/excelparser/build/src/lib/minizip /home/ravloony/projects/excelparser/build/src/lib/minizip/CMakeFiles/minizip_1-1.dir/DependInfo.cmake --color= 
make[2]: Leaving directory `/home/ravloony/projects/excelparser/build' 
make -f src/lib/minizip/CMakeFiles/minizip_1-1.dir/build.make src/lib/minizip/CMakeFiles/minizip_1-1.dir/build 
make[2]: Entering directory `/home/ravloony/projects/excelparser/build' 
make[2]: Nothing to be done for `src/lib/minizip/CMakeFiles/minizip_1-1.dir/build'. 
make[2]: Leaving directory `/home/ravloony/projects/excelparser/build' 
/usr/bin/cmake -E cmake_progress_report /home/ravloony/projects/excelparser/build/CMakeFiles 17 18 19 20 21 
[ 22%] Built target minizip_1-1 
make -f CMakeFiles/run.dir/build.make CMakeFiles/run.dir/depend 
make[2]: Entering directory `/home/ravloony/projects/excelparser/build' 
cd /home/ravloony/projects/excelparser/build && /usr/bin/cmake -E cmake_depends "Unix Makefiles" /home/ravloony/projects/excelparser /home/ravloony/projects/excelparser /home/ravloony/projects/excelparser/build /home/ravloony/projects/excelparser/build /home/ravloony/projects/excelparser/build/CMakeFiles/run.dir/DependInfo.cmake --color= 
Dependee "/home/ravloony/projects/excelparser/build/CMakeFiles/run.dir/DependInfo.cmake" is newer than depender "/home/ravloony/projects/excelparser/build/CMakeFiles/run.dir/depend.internal". 
Dependee "/home/ravloony/projects/excelparser/build/CMakeFiles/CMakeDirectoryInformation.cmake" is newer than depender "/home/ravloony/projects/excelparser/build/CMakeFiles/run.dir/depend.internal". 
Scanning dependencies of target run 
make[2]: Leaving directory `/home/ravloony/projects/excelparser/build' 
make -f CMakeFiles/run.dir/build.make CMakeFiles/run.dir/build 
make[2]: Entering directory `/home/ravloony/projects/excelparser/build' 
/usr/bin/cmake -E cmake_progress_report /home/ravloony/projects/excelparser/build/CMakeFiles 22 
[ 27%] Generating template.o 
ld -r -b binary -o template.o /home/ravloony/projects/excelparser/files/template.xlsx 
objcopy --rename-section .data=.rodata,alloc,load,readonly,data,contents template.o template.o 
make[2]: Leaving directory `/home/ravloony/projects/excelparser/build' 
/usr/bin/cmake -E cmake_progress_report /home/ravloony/projects/excelparser/build/CMakeFiles 22 
[ 27%] Built target run 
make -f CMakeFiles/excelbuilder.dir/build.make CMakeFiles/excelbuilder.dir/depend 
make[2]: Entering directory `/home/ravloony/projects/excelparser/build' 
cd /home/ravloony/projects/excelparser/build && /usr/bin/cmake -E cmake_depends "Unix Makefiles" /home/ravloony/projects/excelparser /home/ravloony/projects/excelparser /home/ravloony/projects/excelparser/build /home/ravloony/projects/excelparser/build /home/ravloony/projects/excelparser/build/CMakeFiles/excelbuilder.dir/DependInfo.cmake --color= 
make[2]: Leaving directory `/home/ravloony/projects/excelparser/build' 
make -f CMakeFiles/excelbuilder.dir/build.make CMakeFiles/excelbuilder.dir/build 
make[2]: Entering directory `/home/ravloony/projects/excelparser/build' 
Linking CXX executable excelbuilder 
/usr/bin/cmake -E cmake_link_script CMakeFiles/excelbuilder.dir/link.txt --verbose=1 
/usr/bin/c++ -std=c++0x -g -ftest-coverage -fprofile-arcs -fpermissive CMakeFiles/excelbuilder.dir/src/common/exception.cpp.o CMakeFiles/excelbuilder.dir/src/excelbuilder/retriever.cpp.o CMakeFiles/excelbuilder.dir/src/excelbuilder/xlsx.cpp.o CMakeFiles/excelbuilder.dir/src/common/config.cpp.o CMakeFiles/excelbuilder.dir/src/excelbuilder/main.cpp.o -o excelbuilder -rdynamic src/lib/minizip/libminizip_1-1.so -ltinyxml2 -lmysqlcppconn -lboost_regex-mt -ltemplate.o -lz -Wl,-rpath,/home/ravloony/projects/excelparser/build/src/lib/minizip 
/usr/bin/ld: cannot find -ltemplate.o 
collect2: error: ld returned 1 exit status 
make[2]: *** [excelbuilder] Error 1 
make[2]: Leaving directory `/home/ravloony/projects/excelparser/build' 
make[1]: *** [CMakeFiles/excelbuilder.dir/all] Error 2 
make[1]: Leaving directory `/home/ravloony/projects/excelparser/build' 
make: *** [all] Error 2 

但template.o已經正確產生，並且是文件夾中。看來ld正在期待一個系統庫。

Answer 1

最後，這是我做到的。

add_custom_command(OUTPUT template.o 
     COMMAND cd ${CMAKE_CURRENT_SOURCE_DIR}/files && ld -r -b binary -o ${CMAKE_CURRENT_BINARY_DIR}/template.o template.xlsx 
     COMMAND objcopy --rename-section .data=.rodata,alloc,load,readonly,data,contents ${CMAKE_CURRENT_BINARY_DIR}/template.o ${CMAKE_CURRENT_BINARY_DIR}/template.o) 

的cd命令那裏，因爲LD設置自動的名字聲明的變量的東西取決於傳遞給輸入文件的完整路徑。因此，如果輸入文件是/home/user/project/files/template.xlsx，則該變量將類似於_binary_home_user_project_files_template_xlsx_start。對於便攜式編譯來說並不酷。

add_library(template 
     STATIC 
     template.o) 

告訴鏈接器將目標文件編譯成二進制文件。這也增加了一個名爲template的目標。

然後

SET_SOURCE_FILES_PROPERTIES(
    template.o 
    PROPERTIES 
    EXTERNAL_OBJECT true 
    GENERATED true 
) 

告訴CMake的不編譯文件，該文件在構建時生成的。

SET_TARGET_PROPERTIES(
    template 
    PROPERTIES 
    LINKER_LANGUAGE C 
) 

否則我們會得到錯誤信息，因爲cmake的無法從名爲「.o」弄清楚-suffix，這是一個C-連接需要。

然後在我的target_link_libraries步驟中，我簡單地添加了template作爲目標。

target_link_libraries (excelbuilder 
      ${MINIZIP_LIB_NAME} 
      ${TINYXML_LIBRARIES} 
      ${MYSQLCONNECTORCPP_LIBRARY} 
      ${Boost_LIBRARIES} 
      template 
      ) 

Answer 2

要將目標文件鏈接到可執行文件，請將其添加到add_executable()的源文件列表中，而不是嘗試將其添加到target_link_libraries()。

首先生成目標文件，參見add_custom_command()。在這種情況下，您需要使用指定OUTPUT參數的表單。