Is it possible to compile the SDK as 32-bit?

[coyotlinden]

We have a very large 32-bit application. Changing that for now is off the table. When I compiled following the instructions and then began the integration into our build system, I got the following:

/usr/bin/ld: ../packages/lib/release/libaws-cpp-sdk-core.so: error adding symbols: file in wrong format
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Checking that:

$ file libaws-cpp-sdk-core.so
libaws-cpp-sdk-core.so: ELF 64-bit LSB shared object, x86-64, version 1 (GNU/Linux), dynamically linked, BuildID[sha1]=5057f2bac52f1074c6367013883228cbf58207dd, with debug_info, not stripped

Following this stackoverflow:

I tried adding:

set(CMAKE_CXX_COMPILER clang++)
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -m32")
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)

to CMakeLists.txt

But I get:

CMake Error at /local/code/cmake/cmake-3.24.1-linux-x86_64/share/cmake-3.24/Modules/CMakeTestCXXCompiler.cmake:62 (message):
  The C++ compiler

    "/usr/bin/g++"

  is not able to compile a simple test program.

  It fails with the following output:

    Change Dir: /local/code/3p-aws-sdk-cpp/CMakeFiles/CMakeTmp

    Run Build Command(s):/usr/bin/make -f Makefile cmTC_6fb40/fast && /usr/bin/make  -f CMakeFiles/cmTC_6fb40.dir/build.make CMakeFiles/cmTC_6fb40.dir/build
    make[1]: Entering directory '/local/code/3p-aws-sdk-cpp-linden/CMakeFiles/CMakeTmp'
    Building CXX object CMakeFiles/cmTC_6fb40.dir/testCXXCompiler.cxx.o
    /usr/bin/g++   -m32  -o CMakeFiles/cmTC_6fb40.dir/testCXXCompiler.cxx.o -c /local/code/3p-aws-sdk-cpp-linden/CMakeFiles/CMakeTmp/testCXXCompiler.cxx
    Linking CXX executable cmTC_6fb40
    /local/code/cmake/cmake-3.24.1-linux-x86_64/bin/cmake -E cmake_link_script CMakeFiles/cmTC_6fb40.dir/link.txt --verbose=1
    /usr/bin/g++  -m32  -rdynamic CMakeFiles/cmTC_6fb40.dir/testCXXCompiler.cxx.o -o cmTC_6fb40
    /usr/bin/ld: cannot find Scrt1.o: No such file or directory
    /usr/bin/ld: cannot find crti.o: No such file or directory
    /usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-linux-gnu/8/libstdc++.so when searching for -lstdc++
    /usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-linux-gnu/8/libstdc++.a when searching for -lstdc++
    /usr/bin/ld: cannot find -lstdc++
    /usr/bin/ld: skipping incompatible //usr/lib/x86_64-linux-gnu/libm.so when searching for -lm
    /usr/bin/ld: skipping incompatible //usr/lib/x86_64-linux-gnu/libm.a when searching for -lm
    /usr/bin/ld: cannot find -lm
    /usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-linux-gnu/8/libgcc_s.so.1 when searching for libgcc_s.so.1
    /usr/bin/ld: skipping incompatible //usr/lib/x86_64-linux-gnu/libgcc_s.so.1 when searching for libgcc_s.so.1
    /usr/bin/ld: cannot find libgcc_s.so.1
    /usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-linux-gnu/8/libgcc.a when searching for -lgcc
    /usr/bin/ld: cannot find -lgcc
    collect2: error: ld returned 1 exit status
    make[1]: *** [CMakeFiles/cmTC_6fb40.dir/build.make:99: cmTC_6fb40] Error 1
    make[1]: Leaving directory '/local/code/3p-aws-sdk-cpp-linden/CMakeFiles/CMakeTmp'
    make: *** [Makefile:127: cmTC_6fb40/fast] Error 2

  CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
  CMakeLists.txt:162 (project)

Due diligence: pointing -DCMAKE_PREFIX_PATH to "/usr/local" by way of following #1991 did not solve the problem. This isn't really a cross compile since we aren't changing architectures.

If there is a way to do this, please let me know. Conversely, if it is impossible, that would be worth knowing also (and something that might go in the README...)

[jmklix]

Yes, you should be able to compile this sdk as 32-bit. But, we haven't tested cross compiling the sdk in this configuration. If you can compile this sdk on a 32-bit machine then it should work for you

[github-actions[bot]]

Hello! Reopening this discussion to make it searchable.