llvm dev - Feb 2014 - [LLVMdev] configure with clang vs gcc

I'm trying to build a native hosted mips compiler on ubuntu x86.

When I run configure with clang/llvm as the compiler, configure thinks 
that zlib is present and that valgrind is.

But later on the make it cannot find zlib.h. If I tell it to not do 
compression, then it does not look for
zlib.h but dies looking for valgrind, even if I tell it to disable-valgrind.

If I configure using gcc-mips, it decides on it's own that zlib.h is not 
available.
It also decides that valgrind is not available.

Why the difference?

Any ideas?

Reed

On Mon, Feb 24, 2014 at 4:14 PM, reed kotler <rkotler at mips.com>
wrote:
> I'm trying to build a native hosted mips compiler on ubuntu x86.
>
> When I run configure with clang/llvm as the compiler, configure thinks that
> zlib is present and that valgrind is.
>
> But later on the make it cannot find zlib.h. If I tell it to not do
> compression, then it does not look for
> zlib.h but dies looking for valgrind, even if I tell it to
disable-valgrind.
>
> If I configure using gcc-mips, it decides on it's own that zlib.h is
not
> available.
> It also decides that valgrind is not available.
>
> Why the difference?
>
How are you configuring?

-eric
> Any ideas?
>
> Reed
>
>
>
>
>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev

On 02/24/2014 04:19 PM, Eric Christopher wrote:
> On Mon, Feb 24, 2014 at 4:14 PM, reed kotler <rkotler at mips.com>
wrote:
>> I'm trying to build a native hosted mips compiler on ubuntu x86.
>>
>> When I run configure with clang/llvm as the compiler, configure thinks
that
>> zlib is present and that valgrind is.
>>
>> But later on the make it cannot find zlib.h. If I tell it to not do
>> compression, then it does not look for
>> zlib.h but dies looking for valgrind, even if I tell it to
disable-valgrind.
>>
>> If I configure using gcc-mips, it decides on it's own that zlib.h
is not
>> available.
>> It also decides that valgrind is not available.
>>
>> Why the difference?
>>
> How are you configuring?
>
> -eric
>
(You can see our wiki page 
https://dmz-portal.mips.com/wiki/Build_mips_clang_llvm )

Basically:

$ OPT="-target mipsel-linux-gnu -mips32r2 -gcc-toolchain ${MIPS}"


$ $CLANG_SRC/configure \
     --prefix=$CLANG_INSTALL \
     --build=i686-pc-linux-gnu \
     --host=mipsel-linux-gnu \
     --enable-optimized \                  # turn on optimization
     "--with-extra-options=${OPT}" \
     "--with-extra-ld-options=${OPT}" \
     CC=$CLANG_TC/bin/clang \
     CXX=$CLANG_TC/bin/clang++ \
     RANLIB=$MIPS/bin/mips-linux-gnu-ranlib \
     AR=$MIPS/bin/mips-linux-gnu-ar \
     build_alias=i686-unknown-linux-gnu host_alias=mipsel-linux-gnu

>> Any ideas?
>>
>> Reed
>>
>>
>>
>>
>>
>> _______________________________________________
>> LLVM Developers mailing list
>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
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On 25 Feb 2014, at 00:14, reed kotler <rkotler at mips.com> wrote:
> I'm trying to build a native hosted mips compiler on ubuntu x86.
> 
> When I run configure with clang/llvm as the compiler, configure thinks that
zlib is present and that valgrind is.
> 
> But later on the make it cannot find zlib.h. If I tell it to not do
compression, then it does not look for
> zlib.h but dies looking for valgrind, even if I tell it to
disable-valgrind.
> 
> If I configure using gcc-mips, it decides on it's own that zlib.h is
not available.
> It also decides that valgrind is not available.
Most likely, your gcc-mips hard codes a non-/ default sysroot, but your clang
does not (it is, after all, intrinsically a cross compiler).  I've
successfully cross-compiled clang+llvm for MIPS before by providing a CMake
toolchain file that tells it the target triple and systroot to use (along with
the other flags required for my target) and it Just Works™.

Or, at least, it builds.  It crashes at run time, and I've still not managed
to figure out exactly why.  It looks like a register value that should be
preserved is not somewhere, but I have a 2GB trace that I need to look through
to find out exactly where...

David