[cfe-dev] Error cross building for the Power PC

[Hal Finkel]

----- Original Message -----
> From: "Richard Pennington" <rich at pennware.com>
> To: "LLVM Developers Mailing List" <llvmdev at cs.uiuc.edu>, "cfe-dev at cs.uiuc.edu Developers" <cfe-dev at cs.uiuc.edu>
> Sent: Sunday, May 11, 2014 5:51:29 AM
> Subject: [cfe-dev] Error cross building for the Power PC
> 
> Hi,
> 
> I build clang/LLVM using libcxx, libcxxabi, musl (C standard
> library),
> and compiiler-rt. As sort of a sanity test, I then use that
> clang/LLVM
> to cross build itself for for arm, armeb, i386, mips, mipsel, and
> ppc.
> (My host is x86_64). For the last month or so the ppc build has been
> failing when linking clang related things. The ppc code generator
> seems
> to want __*ti3 run time support, which it apparently didn't in the
> past.
> I suspect I may be missing something when I build compiler-rt. Any
> suggestions?

It looks like the function exists (http://llvm.org/svn/llvm-project/compiler-rt/trunk/lib/builtins/ashlti3.c), but requires CRT_HAS_128BIT to be defined during the build process.

Furthermore, it looks like the dependence on CRT_HAS_128BIT was introduced in r201909, and is defined in lib/builtins/int_types.h only when __LP64__ is defined (which explains why you're not getting it on PPC32). I'm pretty sure this is not quite right because PPC32 also has __int128 support. Can you try adjusting the header so that CRT_HAS_128BIT will also be defined if __ppc__ is defined, and let me know if that fixes things?

 -Hal

> 
> -Rich
> 
> P.S.: I get errors like:
> 
> /home/rich/ellcc/llvm/tools/clang/lib/Basic/Warnings.cpp:(.text._ZN5clang21ProcessWarningOptionsERNS_17DiagnosticsEngineERKNS_17DiagnosticOptionsEb+0x168):
> undefined reference to `__ashlti3'
> /home/rich/ellcc/llvm/tools/clang/lib/Basic/Warnings.cpp:(.text._ZN5clang21ProcessWarningOptionsERNS_17DiagnosticsEngineERKNS_17DiagnosticOptionsEb+0x184):
> undefined reference to `__ashlti3'
> /home/rich/ellcc/llvm/tools/clang/lib/Basic/Warnings.cpp:(.text._ZN5clang21ProcessWarningOptionsERNS_17DiagnosticsEngineERKNS_17DiagnosticOptionsEb+0x1a4):
> undefined reference to `__lshrti3'
> /home/rich/ellcc/llvm/tools/clang/lib/Basic/Warnings.cpp:(.text._ZN5clang21ProcessWarningOptionsERNS_17DiagnosticsEngineERKNS_17DiagnosticOptionsEb+0x1cc):
> undefined reference to `__lshrti3'
> /home/rich/ellcc/llvm/tools/clang/lib/Basic/Warnings.cpp:(.text._ZN5clang21ProcessWarningOptionsERNS_17DiagnosticsEngineERKNS_17DiagnosticOptionsEb+0x23c):
> undefined reference to `__lshrti3'
> /home/rich/ellcc/llvm/tools/clang/lib/Basic/Warnings.cpp:(.text._ZN5clang21ProcessWarningOptionsERNS_17DiagnosticsEngineERKNS_17DiagnosticOptionsEb+0x274):
> undefined reference to `__ashlti3'
> /home/rich/ellcc/llvm/tools/clang/lib/Basic/Warnings.cpp:(.text._ZN5clang21ProcessWarningOptionsERNS_17DiagnosticsEngineERKNS_17DiagnosticOptionsEb+0x294):
> undefined reference to `__lshrti3'
> ecc: error: linker command failed with exit code 1 (use -v to see
> invocation)
> make[4]: ***
> [/home/rich/ellcc/llvm-build-ppc-linux/Release+Asserts/bin/c-index-test]
> Error 1
> make[4]: Leaving directory
> `/home/rich/ellcc/llvm-build-ppc-linux/tools/clang/tools/c-index-test'
> make[3]: *** [all] Error 1
> make[3]: Leaving directory
> `/home/rich/ellcc/llvm-build-ppc-linux/tools/clang/tools'
> make[2]: *** [all] Error 1
> make[2]: Leaving directory
> `/home/rich/ellcc/llvm-build-ppc-linux/tools/clang'
> make[1]: *** [clang/.makeall] Error 2
> make[1]: Leaving directory
> `/home/rich/ellcc/llvm-build-ppc-linux/tools'
> make: *** [all] Error 1
> [~/ellcc/llvm-build-ppc-linux] dev%
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> 

-- 
Hal Finkel
Assistant Computational Scientist
Leadership Computing Facility
Argonne National Laboratory