use cmake build for macos Xcode show errors! about unicorn

[wtdcode]

Unfortunately we never expect the xcode backend to work because we don't have any proficient knowledge on xcode development.

[firodj]

In my case I got:

ERROR: "/Applications/Xcode-15.1.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc" cannot build an executable (is your linker broken?)

I found that this by commenting this line it will success!

unicorn/CMakeLists.txt

Line 314 in d4b9248

--cc=${CMAKE_C_COMPILER}

Could anyone tell why is it here? (coming from Unicorn 2)

[wtdcode]

This is from qemu. Commenting this line will give you inconsistent setup.

As far as I know about Xcode toolchain, it's probably your cc settings problem.

[firodj]

After I investigated, the qemu/cofigure missing -isysroot flags that needed by apple clang if only invoked outside /usr/bin.

So there are two places for clang: /usr/bin/cc and /Applications/Xcode-15.1.0.app/.../usr/bin/cc. The 1st seems only a shim with "proper" search path, it being used when --cc flags omitted.

But, CMake the using 2nd ver which require -isysroot being passed to external script. CMake implicitly added these flags with value from CMAKE_OSX_SYSROOT on its generator.

I'm suggesting to add following lines, before calling qemu/cofigure:

   if (CMAKE_OSX_SYSROOT)
        set (EXTRA_CFLAGS "${EXTRA_CFLAGS} -isysroot ${CMAKE_OSX_SYSROOT} ")
    endif()

[wtdcode]

After I investigated, the qemu/cofigure missing -isysroot flags that needed by apple clang if only invoked outside /usr/bin.

So there are two places for clang: /usr/bin/cc and /Applications/Xcode-15.1.0.app/.../usr/bin/cc. The 1st seems only a shim with "proper" search path, it being used when --cc flags omitted.

But, CMake the using 2nd ver which require -isysroot being passed to external script. CMake implicitly added these flags with value from CMAKE_OSX_SYSROOT on its generator.

I'm suggesting to add following lines, before calling qemu/cofigure:

   if (CMAKE_OSX_SYSROOT)
        set (EXTRA_CFLAGS "${EXTRA_CFLAGS} -isysroot ${CMAKE_OSX_SYSROOT} ")
    endif()

Great, thanks for investigating this. -isysroot was once there but removed because breaking when using /usr/bin/cc. I will have a look.

[wtdcode]

link to #1924

[wtdcode]

Fixed in a9a54ae