如何配置CMake使用-fPIC构建库？ [英] How to configure CMake to build a library with -fPIC?

问题描述

我试图创建一个指定 -fPIC 的静态库。

  add_library（cpp-netlib_pic 
 STATIC 
 $ {SRCS}）
 set_property（TARGET cpp-netlib_pic PROPERTY POSITION_INDEPENDENT_CODE）
  

这不起作用。

库（ cpp-netlib_pic ）不包含 -fPIC 标志。

链接到 cpp-netlib_pic
do 但是，将 -fPIC 添加到它们的编译器标记，因为 cpp-netlib_pic 没有连接失败。

这里 foo 将添加 -fPIC ：

  add_library 
 SHARED 
 $ {SRCS}）
 target_link_libraries（foo cpp-netlib_pic）
  

$ b b

我用make VERBOSE = 1证明了这一点。

  [87％] Building CXX object third_party / cpp -netlib / CMakeFiles / cpp-netlib_pic.dir / src / server_request_parsers_impl.cpp.o 
 / usr / bin / c ++ ... -std = c ++ 14 -Werror -Wall -Wextra ... \ 
 -o CMakeFiles / cpp-netlib_pic.dir / src / server_request_parsers_impl.cpp.o \ 
 -c ... / third_party / cpp-netlib / src / server_request_parsers_impl.cpp 
  

此处注意 -fPIC 。

当创建使用 cpp-netlib_pic ， -fPIC的目标 foo 出现：

  [93％] Building CXX object foo.cc.o 
 / usr / bin / c ++ ... -std = c ++ 14 -Werror -Wall -Wextra ... -fPIC ... \ 
 -o CMakeFiles / foo_shared_lib.dir / foo.cc.o \ 
 -c ... / foo / foo.cc 
  

如何配置CMake使用 -fPIC ？

构建第一个库（ cpp-netlib_pic =h2_lin>解决方案

您似乎忘记了 ON ：

  set_property（TARGET cpp-netlib_pic PROPERTY POSITION_INDEPENDENT_CODE ON）
  




I'm trying to create a static library with -fPIC specified.

add_library(cpp-netlib_pic
    STATIC
    ${SRCS})
set_property(TARGET cpp-netlib_pic PROPERTY POSITION_INDEPENDENT_CODE)

This doesn't work.

The library (cpp-netlib_pic) is built without the -fPIC flags.

Other targets which link against cpp-netlib_pic do however, have -fPIC added to their compiler flags, but the linking fails because cpp-netlib_pic didn't.

Here foo will have -fPIC added:

add_library(foo
    SHARED
    ${SRCS})
target_link_libraries(foo cpp-netlib_pic)

I've proved this to myself with make VERBOSE=1

[ 87%] Building CXX object third_party/cpp-netlib/CMakeFiles/cpp-netlib_pic.dir/src/server_request_parsers_impl.cpp.o
/usr/bin/c++   ... -std=c++14 -Werror -Wall -Wextra ... \
    -o CMakeFiles/cpp-netlib_pic.dir/src/server_request_parsers_impl.cpp.o \
    -c .../third_party/cpp-netlib/src/server_request_parsers_impl.cpp

Note no -fPIC here.

When building target foo which uses cpp-netlib_pic, -fPIC appears:

[ 93%] Building CXX object foo.cc.o
/usr/bin/c++  ... -std=c++14 -Werror -Wall -Wextra ... -fPIC ... \
    -o CMakeFiles/foo_shared_lib.dir/foo.cc.o \
    -c .../foo/foo.cc

How can I configure CMake to build the 1st library (cpp-netlib_pic) with -fPIC?

解决方案

You seem to have forgotten the ON:

set_property(TARGET cpp-netlib_pic PROPERTY POSITION_INDEPENDENT_CODE ON)

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