[LLVMdev] "clang -v" shows a GCC call

[Swiss Guy]

Thanks for your really fast answer.

I understood that, but this means that the llvm+Clang suite is not able to
create a machine binary file without any intervention of GCC ?

I thought it could.

This means too that I must port GCC+Binutils in order to have a LLVM port
for my architecture ?

That sound like a huge work, I've chosen LLVM at the beginnig because I
thought it could avoid me porting GCC+Binutils.

Thanks for the reply.



Jim Grosbach wrote:
> 
> llvm (and clang) do not include binutils. You're seeing clang invoking the
> gcc shell to assemble the .s file that clang generated, then again to link
> the object file into an executable.
> 
> On Apr 27, 2010, at 8:31 AM, Swiss Guy wrote:
> 
>> 
>> Hi everyone, 
>> 
>> I'm very new to the world of compilation and I've got to spend some time
>> time on LLVM.
>> As I have to produce a cross compiler for a completely new target and I
>> don't want to cross-build the binutils, I choose Clang as a replacement
>> frontend for llvm instead of llvm-gcc.
>> 
>> But first, I just would like to compile something on my Linux platform in
>> order to test the software, no question about cross-compiling at the
>> moment.
>> The only problem is that every time I try to compile using the command
>> below, I get this result telling me that Clang is calling gcc instead of
>> all
>> the LLVM tools
>> 
>> Here's the command and the result (I skipped a line at each GCC call):
>> 
>> 
>> $clang -v hello.c
>> 
>> clang version 1.0
>> (https://llvm.org/svn/llvm-project/cfe/branches/release_26
>> exported)
>> Target: i386-pc-linux-gnu
>> Thread model: posix
>> "/bin/clang-cc" -triple i386-pc-linux-gnu -S -disable-free
>> -main-file-name
>> main.c --relocation-model static --disable-fp-elim --unwind-tables=0
>> --mcpu=pentium4 --fmath-errno=1 -v -fdiagnostics-show-option -o
>> /tmp/cc-G6QVZj.s -x c main.c
>> clang-cc version 1.0 based upon llvm 2.6 hosted on i686-pc-linux-gnu
>> ignoring nonexistent directory "/System/Library/Frameworks"
>> ignoring nonexistent directory "/Library/Frameworks"
>> #include "..." search starts here:
>> #include <...> search starts here:
>> /lib/clang/1.0/include
>> /usr/include
>> End of search list.
>> 
>> "/usr/bin/gcc" -v -c -m32 -o /tmp/cc-J586JU.o -x assembler
>> /tmp/cc-G6QVZj.s
>> Reading specs from /usr/lib/gcc/i686-pc-cygwin/3.4.4/specs
>> Configured with: ../configure --verbose --program-suffix=-3 --prefix=/usr
>> --exec-prefix=/usr --sysconfdir=/etc --libdir=/usr/lib
>> --libexecdir=/usr/lib
>> --mandir=/usr/share/man --infodir=/usr/share/info
>> --enable-languages=c,ada,c++,d,f77,pascal,java,objc --enable-nls
>> --without-included-gettext --enable-version-specific-runtime-libs
>> --without-x --enable-libgcj --disable-java-awt --with-system-zlib
>> --enable-interpreter --disable-libgcj-debug --enable-threads=posix
>> --enable-java-gc=boehm --disable-win32-registry --enable-sjlj-exceptions
>> --enable-hash-synchronization --enable-libstdcxx-debug
>> Thread model: posix
>> gcc version 3.4.4 (Red Hat 3.4.4)
>> as -o /tmp/cc-J586JU.o /tmp/cc-G6QVZj.s
>> 
>> "/usr/bin/gcc" -v -m32 -o a.out /tmp/cc-J586JU.o
>> Reading specs from /usr/lib/gcc/i686-pc-linux-gnu/3.4.4/specs
>> Configured with: ../configure --verbose --program-suffix=-3 --prefix=/usr
>> --exec-prefix=/usr --sysconfdir=/etc --libdir=/usr/lib
>> --libexecdir=/usr/lib
>> --mandir=/usr/share/man --infodir=/usr/share/info
>> --enable-languages=c,ada,c++,d,f77,pascal,java,objc --enable-nls
>> --without-included-gettext --enable-version-specific-runtime-libs
>> --without-x --enable-libgcj --disable-java-awt --with-system-zlib
>> --enable-interpreter --disable-libgcj-debug --enable-threads=posix
>> --enable-java-gc=boehm --disable-win32-registry --enable-sjlj-exceptions
>> --enable-hash-synchronization --enable-libstdcxx-debug
>> Thread model: posix
>> gcc version 3.4.4 (Red Hat 3.4.4)
>> collect2 -Bdynamic --dll-search-prefix=cyg -o a.out
>> /usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../crt0.o
>> -L/usr/lib/gcc/i686-pc-cygwin/3.4.4 -L/usr/lib/gcc/i686-pc-cygwin/3.4.4
>> -L/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../..
>> /cygdrive/c/Users/lbonnet/AppData/Local/Temp/cc-J586JU.o -lgcc -lcygwin
>> -luser32 -lkernel32 -ladvapi32 -lshell32 -lgcc
>> 
>> 
>> Excuse me if I wrote something stupid or just forgetting something. Just
>> tell me what's wrong.
>> 
>> Thanks in advance.
>> -- 
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