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决定在我的构建中尝试 LTO（CentOS 7、CMake 3.14.3、gcc 8.2.1、-std=c++17）：

# this adds "-flto -fno-fat-lto-objects"
set(CMAKE_INTERPROCEDURAL_OPTIMIZATION TRUE)

所有项目都构建良好，除了一个：

/home/user/vcpkg/installed/x64-linux/lib/libazurestorage.a(operation_context.cpp.o): In function `_GLOBAL__sub_I_operation_context.cpp':
operation_context.cpp:(.text.startup+0x9c): undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()'
/home/user/vcpkg/installed/x64-linux/lib/libazurestorage.a(cloud_block_blob.cpp.o): In function `_GLOBAL__sub_I_cloud_block_blob.cpp':
cloud_block_blob.cpp:(.text.startup+0x9c): undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()'
/home/user/vcpkg/installed/x64-linux/lib/libazurestorage.a(cloud_blob_container.cpp.o): In function `_GLOBAL__sub_I_cloud_blob_container.cpp':
cloud_blob_container.cpp:(.text.startup+0x9c): undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()'
/home/user/vcpkg/installed/x64-linux/lib/libazurestorage.a(cloud_blob_shared.cpp.o): In function `_GLOBAL__sub_I_cloud_blob_shared.cpp':
cloud_blob_shared.cpp:(.text.startup+0x9c): undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()'
/home/user/vcpkg/installed/x64-linux/lib/libazurestorage.a(cloud_blob_ostreambuf.cpp.o): In function `_GLOBAL__sub_I_cloud_blob_ostreambuf.cpp':
cloud_blob_ostreambuf.cpp:(.text.startup+0x9c): undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()'
/home/user/vcpkg/installed/x64-linux/lib/libazurestorage.a(cloud_blob_client.cpp.o):cloud_blob_client.cpp:(.text.startup+0x9c): more undefined references to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()' follow
collect2: error: ld returned 1 exit status

由于 vcpkg 提供的某些神秘原因libazurestorage.a（它是在没有LTO 的情况下构建的）无法解析std::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()（只有那个符号！）。

为了让它更有趣——其他使用libazurestorage.abuild 的项目就好了。我检查了链接器的命令行——它们看起来几乎相同（几乎相同的库集，几乎相同的顺序）。

有什么想法可能是错的吗？或者如何弄清楚为什么其他项目构建良好？

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0 回答 0