[llvm-bugs] [Bug 42409] New: compiler-rt fails to build when building 32-bit compat libraries on a 64-bit OS

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42409

            Bug ID: 42409
           Summary: compiler-rt fails to build when building 32-bit compat
                    libraries on a 64-bit OS
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: bero at lindev.ch
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

Building LLVM (with all subprojects enabled) from the current git tree results
in

[6/2906] Linking CXX static library
lib64/clang/9.0.0/lib/linux/libclang_rt.fuzzer-i386.a
FAILED: lib64/clang/9.0.0/lib/linux/libclang_rt.fuzzer-i386.a 
: && /usr/bin/cmake -E remove
lib64/clang/9.0.0/lib/linux/libclang_rt.fuzzer-i386.a && /usr/bin/ar qc
lib64/clang/9.0.0/lib/linux/libclang_rt.fuzzer-i386.a 
projects/compiler-rt/lib/fuzzer/CMakeFiles/RTfuzzer.i386.dir/FuzzerCrossOver.cpp.o
projects/compiler-rt/lib/fuzzer/CMakeFiles/RTfuzzer.i386.dir/FuzzerDataFlowTrace.cpp.o
projects/compiler-rt/lib/fuzzer/CMakeFiles/RTfuzzer.i386.dir/FuzzerDriver.cpp.o
projects/compiler-rt/lib/fuzzer/CMakeFiles/RTfuzzer.i386.dir/FuzzerExtFunctionsDlsym.cpp.o
projects/compiler-rt/lib/fuzzer/CMakeFiles/RTfuzzer.i386.dir/FuzzerExtFunctionsWeak.cpp.o
projects/compiler-rt/lib/fuzzer/CMakeFiles/RTfuzzer.i386.dir/FuzzerExtFunctionsWindows.cpp.o
projects/compiler-rt/lib/fuzzer/CMakeFiles/RTfuzzer.i386.dir/FuzzerExtraCounters.cpp.o
projects/compiler-rt/lib/fuzzer/CMakeFiles/RTfuzzer.i386.dir/FuzzerFork.cpp.o
projects/compiler-rt/lib/fuzzer/CMakeFiles/RTfuzzer.i386.dir/FuzzerIO.cpp.o
projects/compiler-rt/lib/fuzzer/CMakeFiles/RTfuzzer.i386.dir/FuzzerIOPosix.cpp.o
projects/compiler-rt/lib/fuzzer/CMakeFiles/RTfuzzer.i386.dir/FuzzerIOWindows.cpp.o
projects/compiler-rt/lib/fuzzer/CMakeFiles/RTfuzzer.i386.dir/FuzzerLoop.cpp.o
projects/compiler-rt/lib/fuzzer/CMakeFiles/RTfuzzer.i386.dir/FuzzerMerge.cpp.o
projects/compiler-rt/lib/fuzzer/CMakeFiles/RTfuzzer.i386.dir/FuzzerMutate.cpp.o
projects/compiler-rt/lib/fuzzer/CMakeFiles/RTfuzzer.i386.dir/FuzzerSHA1.cpp.o
projects/compiler-rt/lib/fuzzer/CMakeFiles/RTfuzzer.i386.dir/FuzzerTracePC.cpp.o
projects/compiler-rt/lib/fuzzer/CMakeFiles/RTfuzzer.i386.dir/FuzzerUtil.cpp.o
projects/compiler-rt/lib/fuzzer/CMakeFiles/RTfuzzer.i386.dir/FuzzerUtilDarwin.cpp.o
projects/compiler-rt/lib/fuzzer/CMakeFiles/RTfuzzer.i386.dir/FuzzerUtilFuchsia.cpp.o
projects/compiler-rt/lib/fuzzer/CMakeFiles/RTfuzzer.i386.dir/FuzzerUtilLinux.cpp.o
projects/compiler-rt/lib/fuzzer/CMakeFiles/RTfuzzer.i386.dir/FuzzerUtilPosix.cpp.o
projects/compiler-rt/lib/fuzzer/CMakeFiles/RTfuzzer.i386.dir/FuzzerUtilWindows.cpp.o
projects/compiler-rt/lib/fuzzer/CMakeFiles/RTfuzzer_main.i386.dir/FuzzerMain.cpp.o
&& /usr/bin/ranlib lib64/clang/9.0.0/lib/linux/libclang_rt.fuzzer-i386.a && cd
/home/bero/temp/abf/llvm/BUILD/llvm-9.0.0-20190625/build/projects/compiler-rt/lib/fuzzer/cxx_i386_merge.dir
&& /usr/bin/ld -m elf_i386 --whole-archive
/home/bero/temp/abf/llvm/BUILD/llvm-9.0.0-20190625/build/lib64/clang/9.0.0/lib/linux/libclang_rt.fuzzer-i386.a
--no-whole-archive
/home/bero/temp/abf/llvm/BUILD/llvm-9.0.0-20190625/build/projects/compiler-rt/lib/fuzzer/libcxx_fuzzer_i386/lib/libc++.a
-r -o fuzzer.o && /usr/bin/objcopy --localize-hidden fuzzer.o && /usr/bin/cmake
-E remove
/home/bero/temp/abf/llvm/BUILD/llvm-9.0.0-20190625/build/lib64/clang/9.0.0/lib/linux/libclang_rt.fuzzer-i386.a
&& /usr/bin/ar qcs
/home/bero/temp/abf/llvm/BUILD/llvm-9.0.0-20190625/build/lib64/clang/9.0.0/lib/linux/libclang_rt.fuzzer-i386.a
fuzzer.o
/usr/bin/ld: warning: Disabling --icf due to -r
/usr/bin/ld: error:
/home/bero/temp/abf/llvm/BUILD/llvm-9.0.0-20190625/build/projects/compiler-rt/lib/fuzzer/libcxx_fuzzer_i386/lib/libc++.a(algorithm.cpp.o):
incompatible target
/usr/bin/ld: error:
/home/bero/temp/abf/llvm/BUILD/llvm-9.0.0-20190625/build/projects/compiler-rt/lib/fuzzer/libcxx_fuzzer_i386/lib/libc++.a(chrono.cpp.o):
incompatible target
/usr/bin/ld: error:
/home/bero/temp/abf/llvm/BUILD/llvm-9.0.0-20190625/build/projects/compiler-rt/lib/fuzzer/libcxx_fuzzer_i386/lib/libc++.a(condition_variable.cpp.o):
incompatible target
/usr/bin/ld: error:
/home/bero/temp/abf/llvm/BUILD/llvm-9.0.0-20190625/build/projects/compiler-rt/lib/fuzzer/libcxx_fuzzer_i386/lib/libc++.a(ios.cpp.o):
incompatible target
/usr/bin/ld: error:
/home/bero/temp/abf/llvm/BUILD/llvm-9.0.0-20190625/build/projects/compiler-rt/lib/fuzzer/libcxx_fuzzer_i386/lib/libc++.a(locale.cpp.o):
incompatible target
/usr/bin/ld: error:
/home/bero/temp/abf/llvm/BUILD/llvm-9.0.0-20190625/build/projects/compiler-rt/lib/fuzzer/libcxx_fuzzer_i386/lib/libc++.a(mutex.cpp.o):
incompatible target
/usr/bin/ld: error:
/home/bero/temp/abf/llvm/BUILD/llvm-9.0.0-20190625/build/projects/compiler-rt/lib/fuzzer/libcxx_fuzzer_i386/lib/libc++.a(new.cpp.o):
incompatible target
/usr/bin/ld: error:
/home/bero/temp/abf/llvm/BUILD/llvm-9.0.0-20190625/build/projects/compiler-rt/lib/fuzzer/libcxx_fuzzer_i386/lib/libc++.a(string.cpp.o):
incompatible target
/usr/bin/ld: error:
/home/bero/temp/abf/llvm/BUILD/llvm-9.0.0-20190625/build/projects/compiler-rt/lib/fuzzer/libcxx_fuzzer_i386/lib/libc++.a(system_error.cpp.o):
incompatible target
/usr/bin/ld: error:
/home/bero/temp/abf/llvm/BUILD/llvm-9.0.0-20190625/build/projects/compiler-rt/lib/fuzzer/libcxx_fuzzer_i386/lib/libc++.a(thread.cpp.o):
incompatible target
/usr/bin/ld: error:
/home/bero/temp/abf/llvm/BUILD/llvm-9.0.0-20190625/build/projects/compiler-rt/lib/fuzzer/libcxx_fuzzer_i386/lib/libc++.a(vector.cpp.o):
incompatible target
/usr/bin/ld: error:
/home/bero/temp/abf/llvm/BUILD/llvm-9.0.0-20190625/build/projects/compiler-rt/lib/fuzzer/libcxx_fuzzer_i386/lib/libc++.a(cxa_guard.cpp.o):
incompatible target
/usr/bin/ld: error:
/home/bero/temp/abf/llvm/BUILD/llvm-9.0.0-20190625/build/projects/compiler-rt/lib/fuzzer/libcxx_fuzzer_i386/lib/libc++.a(private_typeinfo.cpp.o):
incompatible target
/usr/bin/ld: error:
/home/bero/temp/abf/llvm/BUILD/llvm-9.0.0-20190625/build/projects/compiler-rt/lib/fuzzer/libcxx_fuzzer_i386/lib/libc++.a(stdlib_new_delete.cpp.o):
incompatible target
ninja: build stopped: subcommand failed.

Looking into the listed object files shows that all the files in libc++.a in
libcxx_fuzzer_i386 are actually 64-bit files.
Looks like the CMake files for libcxx_fuzzer_i386 don't pass the correct
-target or -m32 flags.


This may be related to
https://bugs.llvm.org/show_bug.cgi?id=38025

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