[llvm-bugs] [Bug 52091] New: Building llvm 13 - Cross Compile - clang-ast-debug Exec format error

via llvm-bugs llvm-bugs at lists.llvm.org
Wed Oct 6 07:09:30 PDT 2021


            Bug ID: 52091
           Summary: Building llvm 13 - Cross Compile - clang-ast-debug
                    Exec format error
           Product: Build scripts
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: cmake
          Assignee: unassignedbugs at nondot.org
          Reporter: lancethepants at gmail.com
                CC: llvm-bugs at lists.llvm.org

I'm cross-compiling clang, lld and ldb for an arm32 cpu. I previously
cross-compiled clang 12.0.1, and am now trying to now compile clang 13.

I first compile the requisite tools llvm-tblgen, clang-tblgen and lldb-tblgen
for the build system and then make sure to pass those to the cmake invocations
LLVM_TABLEGEN, CLANG_TABLEGEN LLDB_TABLEGEN so it knows where to find them when
needed in cross compilation.

With llvm 13 I'm now getting the error "clang-ast-dump: Exec format error". It
is attempting to run the cross-compiled 'clang-ast-dump' which of course won't
run on the build system.  I built the host version of 'clang-ast-dump' but I
can't see any cmake variable to tell it the location of the build system's
'clang-ast-dump'.  I attempted putting it ahead in the PATH but it doesn't
automatically pick it up that way.

Am I looking over a variable to pass this to cmake, or is there something I can
disable so it does not require 'clang-ast-dump'? I just want the c/c++
compiler, lld and ldb.


Lance Fredrickson

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