[cfe-dev] cross compiling with 6.0.0 not finding gcc paths

Tomasz Mikolajczyk via cfe-dev cfe-dev at lists.llvm.org
Wed Apr 18 12:01:13 PDT 2018 

I would try the following
--gcc-toolchain=/home/repo/jdx/wr8-baytrail_64/buildbox/usr/

On Wed, 18 Apr 2018, 20:54 Miller Henry via cfe-dev, <cfe-dev at lists.llvm.org>
wrote:

> No.  I played with a few alternate paths, but that doesn’t seem to make a
> difference.  Any other ideas?
>
>
>
>     [2/2] Linking C executable cmTC_68894
>
>    FAILED: cmTC_68894
>
>     : && /opt/jdx/tools//usr/bin/clang
> --sysroot=/home/repo/jdx/wr8-baytrail_64/buildbox -fno-omit-frame-pointer
> -gsplit-dwarf -v
> --gcc-toolchain=/home/repo/jdx/wr8-baytrail_64/buildbox/usr/lib64/
> --target=x86_64-wrs-linux
> --sysroot=/home/repo/jdx/wr8-baytrail_64/buildbox -rdynamic -O2
> -L/home/repo/jdx/wr8-baytrail_64/buildbox/usr/local/lib -Wl,--gdb-index
> -lrt -lpthread -Wl,--disable-new-dtags
> CMakeFiles/cmTC_68894.dir/testCCompiler.c.o  -o cmTC_68894   && :
>
>     clang version 6.0.0 (tags/RELEASE_600/final)
>
>     Target: x86_64-wrs-linux
>
>     Thread model: posix
>
>     InstalledDir: /opt/jdx/tools//usr/bin
>
>
> "/opt/jdx/tools/sysroots/x86_64-wrlinuxsdk-linux/usr/bin/x86_64-wrs-linux/x86_64-wrs-linux-ld"
> --sysroot=/home/repo/jdx/wr8-baytrail_64/buildbox -export-dynamic -z relro
> --hash-style=gnu --eh-frame-hdr -m elf_x86_64 -export-dynamic
> -dynamic-linker /lib64/ld-linux-x86-64.so.2 -o cmTC_68894
> /home/repo/jdx/wr8-baytrail_64/buildbox/usr/lib/../lib64/crt1.o
> /home/repo/jdx/wr8-baytrail_64/buildbox/usr/lib/../lib64/crti.o crtbegin.o
> -L/home/repo/jdx/wr8-baytrail_64/buildbox/usr/local/lib
> -L/home/repo/jdx/wr8-baytrail_64/buildbox/lib/../lib64
> -L/home/repo/jdx/wr8-baytrail_64/buildbox/usr/lib/../lib64
> -L/home/repo/jdx/wr8-baytrail_64/buildbox/lib
> -L/home/repo/jdx/wr8-baytrail_64/buildbox/usr/lib --gdb-index -lrt
> -lpthread --disable-new-dtags CMakeFiles/cmTC_68894.dir/testCCompiler.c.o
> -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s
> --no-as-needed crtend.o
> /home/repo/jdx/wr8-baytrail_64/buildbox/usr/lib/../lib64/crtn.o
>
>
> /opt/jdx/tools/sysroots/x86_64-wrlinuxsdk-linux/usr/bin/x86_64-wrs-linux/x86_64-wrs-linux-ld:
> error: cannot open crtbegin.o: No such file or directory
>
>
> /opt/jdx/tools/sysroots/x86_64-wrlinuxsdk-linux/usr/bin/x86_64-wrs-linux/x86_64-wrs-linux-ld:
> error: cannot open crtend.o: No such file or directory
>
>
> /opt/jdx/tools/sysroots/x86_64-wrlinuxsdk-linux/usr/bin/x86_64-wrs-linux/x86_64-wrs-linux-ld:
> error: cannot find -lgcc
>
>
> /opt/jdx/tools/sysroots/x86_64-wrlinuxsdk-linux/usr/bin/x86_64-wrs-linux/x86_64-wrs-linux-ld:
> error: cannot find -lgcc
>
>     clang-6.0: error: linker command failed with exit code 1 (use -v to
> see invocation)
>
>    ninja: build stopped: subcommand failed.
>
>
>
>
>
> *From:* Manoj Gupta [mailto:manojgupta at google.com]
> *Sent:* Wednesday, April 18, 2018 12:44 PM
> *To:* Miller Henry <MillerHenry at JohnDeere.com>
> *Cc:* cfe-dev at lists.llvm.org
> *Subject:* Re: [cfe-dev] cross compiling with 6.0.0 not finding gcc paths
>
>
>
> Does it help to pass the following to the clang command line:
> --gcc-toolchain=/home/repo/jdx/wr8-baytrail_64/buildbox/usr/lib64 ?
>
>
>
> On Wed, Apr 18, 2018 at 7:52 AM Miller Henry via cfe-dev <
> cfe-dev at lists.llvm.org> wrote:
>
>
>
>
>
> I’m building for an embedded system, this is working fine with gcc 5.2.0,
> but I’ve become interested in clang.  In 3.9.1 everything builds fine (once
> I fixed the real bugs – thank you to everyone who wrote useful warnings).
> I’m interested in trying clang 6.0.0, and there things don’t build.
>
>
>
> The first error I get is is from cmake:
>
>     [2/2] Linking C executable cmTC_03cd5
>
> FAILED: cmTC_03cd5
>
>     : && /opt/jdx/tools//usr/local/share/icecc/bin//clang
> --sysroot=/home/user/repo/jdx/wr8-baytrail_64/buildbox
> -fno-omit-frame-pointer -gsplit-dwarf -fdiagnostics-color=always
> --target=x86_64-wrs-linux
> --sysroot=/home/repo/jdx/wr8-baytrail_64/buildbox -rdynamic -O2
> -L/home/repo/jdx/wr8-baytrail_64/buildbox/usr/local/lib -Wl,--gdb-index
> -lrt -lpthread -Wl,--disable-new-dtags
> CMakeFiles/cmTC_03cd5.dir/testCCompiler.c.o  -o cmTC_03cd5   && :
>
> /opt/jdx/tools/sysroots/x86_64-wrlinuxsdk-linux/usr/bin/x86_64-wrs-linux/x86_64-wrs-linux-ld:
> error: cannot open crtbegin.o: No such file or directory
>
> /opt/jdx/tools/sysroots/x86_64-wrlinuxsdk-linux/usr/bin/x86_64-wrs-linux/x86_64-wrs-linux-ld:
> error: cannot open crtend.o: No such file or directory
>
>
> /opt/jdx/tools/sysroots/x86_64-wrlinuxsdk-linux/usr/bin/x86_64-wrs-linux/x86_64-wrs-linux-ld:
> error: cannot find -lgcc
>
>
> /opt/jdx/tools/sysroots/x86_64-wrlinuxsdk-linux/usr/bin/x86_64-wrs-linux/x86_64-wrs-linux-ld:
> error: cannot find -lgcc
>
>     clang-6.0: error: linker command failed with exit code 1 (use -v to
> see invocation)
>
>
>
> crtbegin.o is in
> /home/repo/jdx/wr8-baytrail_64/buildbox/usr/lib64/x86_64-wrs-linux/5.2.0/crtbegin.o
> When I copy the missing files to
> /home/repo/jdx/wr8-baytrail_64/buildbox/usr/lib64 cmake passes and but the
> build fails on unable to find <string> and <vector>, I started to add
> include paths for jdx/wr8-baytrail_64/buildbox/usr/include/c++/5.2.0/ and
> that gets farther.  However it is time to stop hacking the wrong way and
> fix the real problem. I suspect the problem is related to clang not
> understanding my --target option and thus not asking gcc for the paths to
> the missing files, but I don’t really know how to make this work.
>
>
>
> A search finds
> https://stackoverflow.com/questions/4160262/clang-linker-problem, but it
> isn’t helpful because the code in that area has changed so much.
>
>
>
> My host is x86-64 linux.  The target OS is x86_64 embedded linux (the
> sysroot is NOT compatible with the host libraries)
>
>
>
> Can someone give me a hint about where I should look to make this work. I
> can change either the command line arguments or the clang source code but
> I’m not clear on where the right place to look is.
>
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