在 Clion 中链接 libgit2 不起作用

Posted 2023-02-14

【中文标题】在 Clion 中链接 libgit2 不起作用

【英文标题】：Linking against libgit2 in Clion not working

【发布时间】：2016-12-31 18:17:44

【问题描述】：

我发现在 Clion 中使用 libgit2 API 运行任何东西都很困难。我已经使用 Homebrew 安装了所有需要的东西。之前有此编辑

  args = std_cmake_args
  ...
  args << "-DBUILD_SHARED_LIBS=OFF"

#include <git2.h> 运行良好，但我似乎无法运行它。

我尝试了一些简单的示例，但似乎不起作用，所以我决定从 here 获取 libgit2 拥有的示例，看看它是否会起作用，但没有好消息 我收到以下错误

/Applications/CLion.app/Contents/bin/cmake/bin/cmake --build /Users/addo/ClionProjects/Libgit2Training/cmake-build-debug --target Libgit2Training -- -j 4 [ 50%] Building C object CMakeFiles/Libgit2Training.dir/main.c.o [100%] Linking C executable Libgit2Training Undefined symbols for architecture i386:   "_git_blob_lookup", referenced from:
      _blob_parsing in main.c.o   "_git_blob_rawcontent", referenced from:
      _blob_parsing in main.c.o   "_git_blob_rawsize", referenced from:
      _blob_parsing in main.c.o   "_git_commit_author", referenced from:
      _commit_parsing in main.c.o
      _revwalking in main.c.o   "_git_commit_committer", referenced from:
      _commit_parsing in main.c.o   "_git_commit_create_v", referenced from:
      _commit_writing in main.c.o   "_git_commit_free", referenced from:
      _commit_parsing in main.c.o
      _tag_parsing in main.c.o
      _revwalking in main.c.o   "_git_commit_id", referenced from:
      _commit_parsing in main.c.o   "_git_commit_lookup", referenced from:
      _commit_writing in main.c.o
      _commit_parsing in main.c.o
      _revwalking in main.c.o   "_git_commit_message", referenced from:
      _commit_parsing in main.c.o
      _revwalking in main.c.o   "_git_commit_parent", referenced from:
      _commit_parsing in main.c.o   "_git_commit_parentcount", referenced from:
      _commit_parsing in main.c.o   "_git_commit_time", referenced from:
      _commit_parsing in main.c.o   "_git_config_get_int32", referenced from:
      _config_files in main.c.o   "_git_config_get_string", referenced from:
      _config_files in main.c.o   "_git_config_open_ondisk", referenced from:
      _config_files in main.c.o   "_git_index_entrycount", referenced from:
      _index_walking in main.c.o   "_git_index_free", referenced from:
      _index_walking in main.c.o   "_git_index_get_byindex", referenced from:
      _index_walking in main.c.o   "_git_libgit2_init", referenced from:
      _main in main.c.o   "_git_libgit2_shutdown", referenced from:
      _main in main.c.o   "_git_object_free", referenced from:
      _tree_parsing in main.c.o   "_git_object_type2string", referenced from:
      _object_database in main.c.o
      _tag_parsing in main.c.o   "_git_odb_object_data", referenced from:
      _object_database in main.c.o   "_git_odb_object_free", referenced from:
      _object_database in main.c.o   "_git_odb_object_size", referenced from:
      _object_database in main.c.o   "_git_odb_object_type", referenced from:
      _object_database in main.c.o   "_git_odb_read", referenced from:
      _object_database in main.c.o   "_git_odb_write", referenced from:
      _object_database in main.c.o   "_git_oid_fmt", referenced from:
      _oid_parsing in main.c.o
      _object_database in main.c.o
      _commit_writing in main.c.o
      _commit_parsing in main.c.o
      _reference_listing in main.c.o   "_git_oid_fromstr", referenced from:
      _oid_parsing in main.c.o
      _commit_writing in main.c.o
      _commit_parsing in main.c.o
      _tag_parsing in main.c.o
      _tree_parsing in main.c.o
      _blob_parsing in main.c.o
      _revwalking in main.c.o
      ...   "_git_reference_list", referenced from:
      _reference_listing in main.c.o   "_git_reference_lookup", referenced from:
      _reference_listing in main.c.o   "_git_reference_symbolic_target", referenced from:
      _reference_listing in main.c.o   "_git_reference_target", referenced from:
      _reference_listing in main.c.o   "_git_reference_type", referenced from:
      _reference_listing in main.c.o   "_git_repository_free", referenced from:
      _main in main.c.o   "_git_repository_index", referenced from:
      _index_walking in main.c.o   "_git_repository_odb", referenced from:
      _object_database in main.c.o   "_git_repository_open", referenced from:
      _main in main.c.o   "_git_revwalk_free", referenced from:
      _revwalking in main.c.o   "_git_revwalk_new", referenced from:
      _revwalking in main.c.o   "_git_revwalk_next", referenced from:
      _revwalking in main.c.o   "_git_revwalk_push", referenced from:
      _revwalking in main.c.o   "_git_revwalk_sorting", referenced from:
      _revwalking in main.c.o   "_git_signature_new", referenced from:
      _commit_writing in main.c.o   "_git_strarray_free", referenced from:
      _reference_listing in main.c.o   "_git_tag_lookup", referenced from:
      _tag_parsing in main.c.o   "_git_tag_message", referenced from:
      _tag_parsing in main.c.o   "_git_tag_name", referenced from:
      _tag_parsing in main.c.o   "_git_tag_target", referenced from:
      _tag_parsing in main.c.o   "_git_tag_target_type", referenced from:
      _tag_parsing in main.c.o   "_git_tree_entry_byindex", referenced from:
      _tree_parsing in main.c.o   "_git_tree_entry_byname", referenced from:
      _tree_parsing in main.c.o   "_git_tree_entry_name", referenced from:
      _tree_parsing in main.c.o   "_git_tree_entry_to_object", referenced from:
      _tree_parsing in main.c.o   "_git_tree_entrycount", referenced from:
      _tree_parsing in main.c.o   "_git_tree_lookup", referenced from:
      _commit_writing in main.c.o
      _tree_parsing in main.c.o   "_giterr_last", referenced from:
      _check_error in main.c.o ld: symbol(s) not found for architecture i386 clang: error: linker command failed with exit code 1 (use -v to see invocation) make[3]: *** [Libgit2Training] Error 1 make[2]: *** [CMakeFiles/Libgit2Training.dir/all] Error 2 make[1]: *** [CMakeFiles/Libgit2Training.dir/rule] Error 2 make: *** [Libgit2Training] Error 2

这是我在 Clion 中的 CmakeList.txt

cmake_minimum_required(VERSION 3.6)
project(Libgit2Training)

#set(CMAKE_CXX_STANDARD 11)
set(CMAKE_C_FLAGS "$CMAKE_C_FLAGS -Wall -std=c11 ")



set(SOURCE_FILES main.c)
add_executable(Libgit2Training $SOURCE_FILES)

我在libgit2 页面上尝试了一些帮助，并将我的CmakeList.txt set() 更改为此

set(CMAKE_C_FLAGS "$CMAKE_C_FLAGS -Wall -std=c11
        CFLAGS += -I/usr/local/Cellar/libgit2/include
        LDFLAGS += -L/usr/local/Cellar/libgit2/binaries
        LIBRARIES += -lgit2  ")

我得到以下错误：最小化我看到

/Applications/CLion.app/Contents/bin/cmake/bin/cmake --build /Users/addo/ClionProjects/Libgit2Training/cmake-build-debug --target Libgit2Training -- -j 4
[ 50%] Building C object CMakeFiles/Libgit2Training.dir/main.c.o
[100%] Linking C executable Libgit2Training
clang: error: no input files
make[3]: *** [Libgit2Training] Error 1
make[2]: *** [CMakeFiles/Libgit2Training.dir/all] Error 2
make[1]: *** [CMakeFiles/Libgit2Training.dir/rule] Error 2
make: *** [Libgit2Training] Error 2

seemed not to parse in a .c file.

我是 libgit2 的新手

我只是想熟悉并从中学习，但似乎无法像我所知道的任何普通 API 那样工作。我们将不胜感激。

新年快乐！！！

【问题讨论】：

为什么要禁用共享库？你是怎么想出那个字符串来设置为CMAKE_C_FLAGS的？这在 libgit2 链接指南中没有提到，它们不是用于 Homebrew 的正确路径，而且也不是你告诉 C 编译器链接它的方式。看来您的问题非常笼统，关于 CMake、C 编译器和环境变量的工作方式，而不是任何特定于 libgit2 的问题。

@CarlosMartínNieto 我禁用了共享库，因为我想让它们在 mac 上作为静态而不是 dyllib。我从 libgit2 主页 [这里][libgit2.github.com/docs/guides/build-and-link/] 获得了字符串，我刚刚启用了共享库并重新安装并从零开始构建所有内容，但我仍然得到架构 i386 的未定义符号：“_git_blob_lookup”，引用自：_blob_parsing in main。 c.o

@CarlosMartínNieto 你建议我在这一点上做什么？我应该从 Clion 构建首选项中链接它还是可以在 CMakeList.txt 文件中进行链接。

【参考方案1】：

我现在解决了这个问题。感谢@CarlosMartínNieto，我看错了地方。我将 CMakefileList 更改为：

cmake_minimum_required(VERSION 3.6)
project(Libgit2Training)

#set(CMAKE_CXX_STANDARD 11)
set(CMAKE_C_FLAGS "$CMAKE_C_FLAGS -Wall -std=c11 -L/opt/local/lib -lgit2 -lssh2")

/opt/local/lib # for macports

set(SOURCE_FILES main.c)
add_executable(Libgit2Training $SOURCE_FILES)

我仍在为 x86_64 架构被链接 (i386) 错误而构建，因此我将 Clion 首选项中的构建选项更改为此

-D "CMAKE_OSX_ARCHITECTURES:STRING=x86_64"

现在一切正常。我想我现在会对 libgit2 API 有更多的乐趣。谢谢。