无法在Mac OS X上链接静态库

Question

I can't link static libraries to executable file on Mac OS X. I have in my repo directory lib witch contains all of libraries such as libstdc++.a , libssl.a , libz.a .

CMakeList.txt contains:

(...)
set(PROJECT_LINK_LIBS libcurl.a libz.a libssl.a libcrypto.a libstdc++.a libjson-c.a)
link_directories(lib/)
add_executable(myapp ${SOURCES})
target_link_libraries(myapp ${PROJECT_LINK_LIBS} ${CMAKE_THREAD_LIBS_INIT} ${CMAKE_DL_LIBS})

While compiling I got a messages (for each .a file):

ld: warning: ignoring file /Users/kuba/CLionProjects/RigService/lib/macos/libz.a, file was built for archive which is not the architecture being linked (x86_64)

and:

Undefined symbols for architecture x86_64:
    "_curl_easy_cleanup", referenced from:
        HTTPConnection::request(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, char const*) in HTTPConnection.cpp.o
    "_curl_easy_init", referenced from:
        HTTPConnection::request(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, char const*) in HTTPConnection.cpp.o
    "_curl_easy_perform", referenced from:
        HTTPConnection::request(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, char const*) in HTTPConnection.cpp.o
(...)

I have compilate this on a linux before, and there I didn't have any problem.
I was tring to extract all .o files from .a and again build a archive file using

ar rcs libcurl.a *.o

but after it I got the same problem.
I was also trying to build a archive via

libtool -static -o libcurl.a *.o

but then I got a message:

sal:libcrypto kuba$ libtool -static -o libcrypto.a *.o
error: /Library/Developer/CommandLineTools/usr/bin/libtool: file: a_bitstr.o is not an object file (not allowed in a library)
error: /Library/Developer/CommandLineTools/usr/bin/libtool: file: a_bool.o is not an object file (not allowed in a library)
error: /Library/Developer/CommandLineTools/usr/bin/libtool: file: a_bytes.o is not an object file (not allowed in a library)
(...) // error for each .o file

And here is my question, maybe should I start from it, can I link the same .a files while compilating on linux and mac os?

Answer 1

Are you trying to use libraries built for Linux? That won't work, you need libraries built for macOS.