Take a look at the "Toolchain Options" and "Target-Specific Libraries" sections here:
http://clang.llvm.org/docs/CrossCompilation.html Which will show you how to tell the compiler where to find stuff for your target system. hth... don On Tue, Sep 22, 2015 at 11:38 AM, Andreas Messer via cfe-users < cfe-users@lists.llvm.org> wrote: > Hello everybody, > > I'm currently planning to use clang to compile my ARM projects. One bug I > found in clang 3.5 - it tried to link the elf using the host's instead of > the > target's linker - is fixed in trunk source. Unfortunately I found an issue > with > the include files which - in my oppinion - is wrong. When cross compiling > for > the arm target clang adds the hosts include folders to the include search > paths by default: > > /tmp/test_clang $ clang -v --target=arm-none-eabi -c main.c -o main.o > clang version 3.8.0 (http://llvm.org/git/clang.git > 21b3f468fc871980e422404f35fcac7de83cfa9c) (llvm/trunk 248266) > Target: arm-none--eabi > Thread model: posix > InstalledDir: /usr/local/bin > "/usr/local/stow/llvm_r248266-clang_r248254/bin/clang-3.8" -cc1 -triple > armv4t-none--eabi -emit-obj -mrelax-all -disable-free > -disable-llvm-verifier - > main-file-name main.c -mrelocation-model static -mthread-model posix > -mdisable- > fp-elim -fmath-errno -masm-verbose -mconstructor-aliases -target-cpu > arm7tdmi > -target-feature +soft-float-abi -target-feature +strict-align -target-abi > aapcs > -mfloat-abi soft -v -dwarf-column-info -coverage-file > /tmp/test_clang/main.o - > resource-dir > /usr/local/stow/llvm_r248266-clang_r248254/bin/../lib/clang/3.8.0 > -fdebug-compilation-dir /tmp/test_clang -ferror-limit 19 -fmessage-length > 126 > -fallow-half-arguments-and-returns -fno-signed-char -fobjc-runtime=gcc - > fdiagnostics-show-option -fcolor-diagnostics -o main.o -x c main.c > clang -cc1 version 3.8.0 based upon LLVM 3.8.0svn default target x86_64- > unknown-linux-gnu > #include "..." search starts here: > #include <...> search starts here: > /usr/local/include > /usr/local/stow/llvm_r248266-clang_r248254/bin/../lib/clang/3.8.0/include > /usr/include > End of search list. > main.c:5:11: warning: self-comparison always evaluates to true [- > Wtautological-compare] > while(i == i) > ^ > 1 warning generated. > /tmp/test_clang $ > > This is not what I would expect, since this is wrong for cross compilation > in > almost any case. This can be somehow bypassed using -nostdinc option but > then > I have to manually add the .../lib/clang/3.8.0/include. What would be the > best > way to solve this? > > Another thing I noticed occurs when using the -sysroot option. clang then > tries to use $sysroot/usr/include. In my oppinion it should use > $sysroot/include instead. > > Kind regards, > Andreas > > > > _______________________________________________ > cfe-users mailing list > cfe-users@lists.llvm.org > http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-users > >
_______________________________________________ cfe-users mailing list cfe-users@lists.llvm.org http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-users
