[cfe-dev] Building clang on OSX

[Shoaib Meenai via cfe-dev]

LLD for Mach-O has bitrotted significantly and isn't really functional anymore (beyond the most basic programs). I'd recommend sticking with ld64 as the linker.

On 3/15/19, 10:52 AM, "cfe-dev on behalf of David Greene via cfe-dev" <cfe-dev-bounces at lists.llvm.org on behalf of cfe-dev at lists.llvm.org> wrote:

    Nico Weber <thakis at chromium.org> writes:
    
    > Try passing `-isysroot $(xcrun -show-sdk-path)` to -DCMAKE_C_FLAGS and DCMAKE_CXX_FLAGS.
    
    Unfortunately, that did not work.  It's not the compiler building clang
    that can't find the libraries, it's the built clang that's having
    trouble.  Is there some CMake variable to give the built clang a set of
    default options to use?
    
                             -David
    
    > On Thu, Mar 14, 2019 at 10:47 PM David Greene via cfe-dev <cfe-dev at lists.llvm.org> wrote:
    >
    >  I'm attempting to build clang/compiler-rt/lld/libc++ on OSX using ninja.
    >  I get the errors below from lld when running unit tests.  It appears
    >  that clang doesn't know or isn't providing the necessary link paths for
    >  system libraries to lld.
    >
    >  I haven't be able to find many guides about building clang on OSX.  The
    >  ones I have found use Xcode but for various reasons I would rather not
    >  have to do that.  Is Xcode the only way to build clang on OSX?  If not,
    >  is there a CMake variable or other setting that tells clang or lld where
    >  the system libraries are?
    >
    >  Thanks for any help!
    >
    >                        -David
    >
    >  FAIL: Builtins :: TestCases/Darwin/os_version_check_test_no_core_foundation.c (1 of 2)
    >  ******************** TEST 'Builtins :: TestCases/Darwin/os_version_check_test_no_core_foundation.c' FAILED ********************
    >  Script:
    >  --
    >  : 'RUN: at line 1';      /Users/greened/llvm-project/build/x86_64/./bin/clang 
    >  /Users/greened/llvm-project/llvm-project/compiler-rt/test/builtins/TestCases/Darwin/os_version_check_test_no_core_foundation.c -o
    >  /Users/greened/llvm-project/build/x86_64/projects/compiler-rt/test/builtins/TestCases/Darwin/Output/os_version_check_test_no_core_foundation.c.tmp
    >  -mmacosx-version-min=10.6
    >  : 'RUN: at line 2';   
    >  /Users/greened/llvm-project/build/x86_64/projects/compiler-rt/test/builtins/TestCases/Darwin/Output/os_version_check_test_no_core_foundation.c.tmp
    >  --
    >  Exit Code: 1
    >
    >  Command Output (stderr):
    >  --
    >  ld64.lld: warning: ignoring unknown argument: -no_deduplicate
    >  ld64.lld: warning: -sdk_version is required when emitting min version load command.  Setting sdk version to match provided min version
    >  ld64.lld: error: Unable to find library for -lSystem
    >  clang-9: error: linker command failed with exit code 1 (use -v to see invocation)
    >
    >  ******************** TEST 'Builtins :: TestCases/Darwin/os_version_check_test.c' FAILED ********************
    >  Script:
    >  --
    >  : 'RUN: at line 1';      /Users/greened/llvm-project/build/x86_64/./bin/clang 
    >  /Users/greened/llvm-project/llvm-project/compiler-rt/test/builtins/TestCases/Darwin/os_version_check_test.c -o
    >  /Users/greened/llvm-project/build/x86_64/projects/compiler-rt/test/builtins/TestCases/Darwin/Output/os_version_check_test.c.tmp
    >  -mmacosx-version-min=10.6 -framework CoreFoundation -DMAJOR=10 -DMINOR=14 -DSUBMINOR=3
    >  : 'RUN: at line 2';    /Users/greened/llvm-project/build/x86_64/projects/compiler-rt/test/builtins/TestCases/Darwin/Output/os_version_check_test.c.tmp
    >  --
    >  Exit Code: 1
    >
    >  Command Output (stderr):
    >  --
    >  ld64.lld: warning: ignoring unknown argument: -no_deduplicate
    >  ld64.lld: warning: -sdk_version is required when emitting min version load command.  Setting sdk version to match provided min version
    >  ld64.lld: error: Unable to find framework for -framework CoreFoundation
    >  clang-9: error: linker command failed with exit code 1 (use -v to see invocation)
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