[llvm-bugs] [Bug 46533] New: Darwin when compiling in backward compatibility 10.15 -> 10.13, can't go out of box on latter

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=46533

            Bug ID: 46533
           Summary: Darwin when compiling in backward compatibility 10.15
                    -> 10.13, can't go out of box on latter
           Product: clang
           Version: 10.0
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Driver
          Assignee: unassignedclangbugs at nondot.org
          Reporter: llvm at dyatkovskiy.com
                CC: llvm-bugs at lists.llvm.org, neeilans at live.com,
                    richard-llvm at metafoo.co.uk

Created attachment 23670
  --> https://bugs.llvm.org/attachment.cgi?id=23670&action=edit
HOST_LINK_VERSION patch

Steps to reproduce:
Build project on Mac OS X 10.15 with following cmake options:


        cmake -DCMAKE_BUILD_TYPE=Release \
              -DCMAKE_INSTALL_PREFIX=$PWD/install \
              -DCMAKE_OSX_DEPLOYMENT_TARGET=10.13 \
              -DLLVM_ENABLE_PROJECTS="clang libcxx libcxxabi" \
              -G "Ninja" <path-to-llvm-project>/llvm


Then run regular build commands:

ninja
ninja install

Copy installation onto the Mac OS X 10.13 platform, and try to compile
something (you should have either CommandLineTools or XCode installed):

<installation-path>/bin/clang++ test.cpp

Compilation will fail with following errors:

    ld: unknown option: -platform_version
    clang-11: error: linker command failed with exit code 1 (use -v to see
invocation)

Reasons:

It happens because linker version is detected during clang compilation out of
"ld -v" command, which will return newer linker version than on 10.13.

Then during test.cpp compilation, if "-mlinker-version" is not passed, driver
will check for "HOST_LINK_VERSION" constant and will misdecide that it should
use new linker API and thus will pass unsupported parameters.

I propose to enable HOST_LINK_VERSION customization on cmake stage. Then it
would be possible to fix problem by passing "-DHOST_LINK_VERSION=409.12" on
cmake configure stage.

Please find a patch with fix in attachment.

Thanks!

-- 
You are receiving this mail because:
You are on the CC list for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-bugs/attachments/20200701/2346a2d1/attachment-0001.html>