[LLVMdev] Correct usage of isysroot argument

[pmon mail]

Hi

When I'm using clang 3.1 with the isysroot argument, it doesn't seem
to pick up header files from the directory I'm passing through the
command line:

> $ clang -isysroot/myownheaders -v foo.c -c -o foo.o
> clang version 3.1 (tags/RELEASE_31/final)
> Target: i386-pc-linux-gnu
> Thread model: posix
>  "/usr/bin/clang" -cc1 -triple i386-pc-linux-gnu -emit-obj -mrelax-all -disable-free -disable-llvm-verifier -main-file-name foo.c -mrelocation-model static -mdisable-fp-elim -masm-verbose -mconstructor-aliases -target-cpu pentium4 -target-linker-version 2.22 -momit-leaf-frame-pointer -v -coverage-file foo.o -resource-dir /usr/bin/../lib/clang/3.1 -isysroot /myownheaders -fmodule-cache-path /var/tmp/clang-module-cache -internal-isystem /usr/local/include -internal-isystem /usr/bin/../lib/clang/3.1/include -internal-externc-isystem /usr/include/i386-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -fdebug-compilation-dir /home/user/test -ferror-limit 19 -fmessage-length 174 -mstackrealign -fgnu-runtime -fobjc-runtime-has-arc -fobjc-runtime-has-weak -fobjc-fragile-abi -fdiagnostics-show-option -fcolor-diagnostics -o foo.o -x c foo.c
> clang -cc1 version 3.1 based upon LLVM 3.1 default target i386-pc-linux-gnu
> ignoring nonexistent directory "/include"
> #include "..." search starts here:
> #include <...> search starts here:
>  /usr/local/include
>  /usr/bin/../lib/clang/3.1/include
>  /usr/include/i386-linux-gnu
>  /usr/include
> End of search list.

As I interpret this, it doesn't search for headers under "/myownheaders" folder.

In case I run it with gcc it doesn seem to searching for headers in
"/myownheaders":

> $ gcc -isysroot/myownheaders -v foo.c -c -o foo.o
> Using built-in specs.
> COLLECT_GCC=gcc
> COLLECT_LTO_WRAPPER=/usr/lib/gcc/i686-linux-gnu/4.6/lto-wrapper
> Target: i686-linux-gnu
> Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro 4.6.3-1ubuntu5' --with-bugurl=file:///usr/share/doc/gcc-4.6/README.Bugs --enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.6 --enable-shared --enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.6 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object --enable-plugin --enable-objc-gc --enable-targets=all --disable-werror --with-arch-32=i686 --with-tune=generic --enable-checking=release --build=i686-linux-gnu --host=i686-linux-gnu --target=i686-linux-gnu
> Thread model: posix
> gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5)
> COLLECT_GCC_OPTIONS='-isysroot' '/myownheaders' '-v' '-c' '-o' 'foo.o' '-mtune=generic' '-march=i686'
>  /usr/lib/gcc/i686-linux-gnu/4.6/cc1 -quiet -v -imultilib . -imultiarch i386-linux-gnu -isysroot /myownheaders foo.c -quiet -dumpbase foo.c -mtune=generic -march=i686 -auxbase-strip foo.o -version -fstack-protector -o /tmp/ccuQ580s.s
> GNU C (Ubuntu/Linaro 4.6.3-1ubuntu5) version 4.6.3 (i686-linux-gnu)
>         compiled by GNU C version 4.6.3, GMP version 5.0.2, MPFR version 3.1.0-p3, MPC version 0.9
> GGC heuristics: --param ggc-min-expand=98 --param ggc-min-heapsize=128201
> ignoring nonexistent directory "/usr/lib/gcc/i686-linux-gnu/4.6/../../../../i686-linux-gnu/include"
> ignoring nonexistent directory "/myownheaders/usr/include/i386-linux-gnu"
> #include "..." search starts here:
> #include <...> search starts here:
>  /usr/lib/gcc/i686-linux-gnu/4.6/include
>  /usr/lib/gcc/i686-linux-gnu/4.6/include-fixed
>  /myownheaders/usr/include
> End of search list.


Am I invoking clang incorrectly? Where is the problem?

Thanks
pM0n