system includes

Diego_Iastrubni · February 15, 2010, 12:15pm

clang/trunk cannot compile Qt/head right now, at least under windows when using the mingw standard library. The problem is caused by
http://llvm.org/bugs/show_bug.cgi?id=6295

Currently the code just randomly adds directories instead of guessing the best one for this compilation. I will create a patch which fixes this under mingw, by creating a list of available directories and choosing the “best” one - the one with the higher version number. I did not analyze the exact problem under Linux, I will do it later on when I come home, but my guess is that this is something similar to the problem I see under windows.

Regarding Qt - this will need some work, and mostly time. I started working on this in my branch: http://qt.gitorious.org/~elcuco/qt/llvm-support/commits/llvm-support , but IMHO most of the problems are right now in the clang part, not the code in Qt.

akorobeynikov · February 15, 2010, 12:53pm

Hello

Regarding Qt - this will need some work, and mostly time. I started working
on this in my branch:
http://qt.gitorious.org/~elcuco/qt/llvm-support/commits/llvm-support , but
IMHO most of the problems are right now in the clang part, not the code in
Qt.

I dunno for mingw, but qt almostly compiles & runs for me on linux.

Almostly here means:
qmake works (so, I'm using clang-built qmake), clang-compiled linguist
& pixeltool work as well.
uic does not work (generates bogus output), some parts cannot be
compiled right now as well (CLucence & libPhonon) at least.

Diego_Iastrubni · February 15, 2010, 12:58pm

This will explain why I had problems compiling the printing stuff… this is the first module in the build system which uses UIC to build GUI… ok, thanks. That explains a lot

Andy_Wick · February 15, 2010, 1:21pm

Stupid question, if using g++ to compile clang would it be possible to discover the system include just by looking at the –v output? We use non standard locations.

g++ -v t.c
#include <…> search starts here:
/opt/bcs/packages/gcc4-4.3.3/bin/…/lib/gcc/i686-pc-linux-gnu/4.3.3/include
/opt/bcs/packages/gcc4-4.3.3/bin/…/lib/gcc/i686-pc-linux-gnu/4.3.3/include-fixed
/opt/bcs/packages/gcc4-4.3.3/bin/…/lib/gcc/…/…/include/g++
/opt/bcs/packages/gcc4-4.3.3/bin/…/lib/gcc/…/…/include/g++/i686-pc-linux-gnu
/opt/bcs/packages/gcc4-4.3.3/bin/…/lib/gcc/…/…/include/g++/backward
/opt/bcs/include
/opt/bcs/packages/gcc4-4.3.3/bin/…/lib/gcc/…/…/include
/usr/include
End of search list.

DougGregor · February 15, 2010, 3:52pm

Yes. We’ve been hoping that someone would contribute configure logic to probe the system compiler to determine what system includes should be baked into the Clang we build. It’s important, but nobody has gotten around to doing it yet.

Interested?

Doug

Diego_Iastrubni · February 15, 2010, 8:45pm

So you want to lock the directories to the directories of the compiler which bootstrapped clang? Not smart, what happens when you change gcc compiler on your system? clang will fail.

IMHO, the best solution would be to find it on “standard” paths… maybe add a “–gcc-include-path” parameter or something. What do you think?

Rafael_Espindola · February 15, 2010, 9:05pm

Clang's configure (llvm's actually) script already has options to use
a particular include directory for C or C++. A --copy-gcc=/usr/bin/gcc
would be an extra convenience for those that just want to build clang
to work as a system compiler.

Cheers,

Andy_Wick · February 15, 2010, 10:00pm

So I’m thinking in the case when I compile clang on the system from svn and will probably keep them in sync. You are right that this probably doesn’t make sense in distribution builds. However, I’m not sure this is any worse then what is already done, where some “random” paths are already compiled in (see my clang++ -v t.cc below) Might even speed up clang by a few nanosecs to not have to stat those non existent directories on every run.

Maybe a simpler fix for me now is to soft link all the g++ includes into /usr/local/lib/clang/1.1/include (btw should that be 2.7?) which is better then having to edit InitHeaderSearch.cpp

Thanks,
Andy

clang -cc1 version 1.1 based upon llvm 2.7svn hosted on i386-pc-linux-gnu
ignoring nonexistent directory “/usr/include/c++/4.4.3”
ignoring nonexistent directory “/usr/include/c++/4.4.3/x86_64-pc-linux-gnu/32”
ignoring nonexistent directory “/usr/include/c++/4.4.3/backward”
ignoring nonexistent directory “/usr/include/c++/4.4.3”
ignoring nonexistent directory “/usr/include/c++/4.4.3/i686-pc-linux-gnu/”
ignoring nonexistent directory “/usr/include/c++/4.4.3/backward”
ignoring nonexistent directory “/usr/include/c++/4.4.2”
ignoring nonexistent directory “/usr/include/c++/4.4.2/x86_64-linux-gnu/32”
ignoring nonexistent directory “/usr/include/c++/4.4.2/backward”
ignoring nonexistent directory “/usr/include/c++/4.1.3”
ignoring nonexistent directory “/usr/include/c++/4.1.3/i486-linux-gnu/”
ignoring nonexistent directory “/usr/include/c++/4.1.3/backward”
ignoring nonexistent directory “/usr/include/c++/4.3.3”
ignoring nonexistent directory “/usr/include/c++/4.3.3/x86_64-linux-gnu/32”
ignoring nonexistent directory “/usr/include/c++/4.3.3/backward”
ignoring nonexistent directory “/usr/include/c++/4.4.1”
ignoring nonexistent directory “/usr/include/c++/4.4.1/x86_64-linux-gnu/32”
ignoring nonexistent directory “/usr/include/c++/4.4.1/backward”
ignoring nonexistent directory “/usr/include/c++/4.1.2”
ignoring nonexistent directory “/usr/include/c++/4.1.2/i386-redhat-linux/”
ignoring nonexistent directory “/usr/include/c++/4.1.2/backward”
ignoring nonexistent directory “/usr/include/c++/4.3.0”
ignoring nonexistent directory “/usr/include/c++/4.3.0/i386-redhat-linux/”
ignoring nonexistent directory “/usr/include/c++/4.3.0/backward”
ignoring nonexistent directory “/usr/include/c++/4.3.2”
ignoring nonexistent directory “/usr/include/c++/4.3.2/i386-redhat-linux/”
ignoring nonexistent directory “/usr/include/c++/4.3.2/backward”
ignoring nonexistent directory “/usr/include/c++/4.3.2”
ignoring nonexistent directory “/usr/include/c++/4.3.2/x86_64-redhat-linux/32”
ignoring nonexistent directory “/usr/include/c++/4.3.2/backward”
ignoring nonexistent directory “/usr/include/c++/4.4.1”
ignoring nonexistent directory “/usr/include/c++/4.4.1/i586-redhat-linux/”
ignoring nonexistent directory “/usr/include/c++/4.4.1/backward”
ignoring nonexistent directory “/usr/include/c++/4.4.2”
ignoring nonexistent directory “/usr/include/c++/4.4.2/i686-redhat-linux/”
ignoring nonexistent directory “/usr/include/c++/4.4.2/backward”
ignoring nonexistent directory “/usr/include/c++/4.3”
ignoring nonexistent directory “/usr/include/c++/4.3/i586-suse-linux/”
ignoring nonexistent directory “/usr/include/c++/4.3/backward”
ignoring nonexistent directory “/usr/include/c++/4.3”
ignoring nonexistent directory “/usr/include/c++/4.3/x86_64-suse-linux/32”
ignoring nonexistent directory “/usr/include/c++/4.3/backward”
ignoring nonexistent directory “/usr/include/c++/4.4”
ignoring nonexistent directory “/usr/include/c++/4.4/i586-suse-linux/”
ignoring nonexistent directory “/usr/include/c++/4.4/backward”
ignoring nonexistent directory “/usr/include/c++/4.4”
ignoring nonexistent directory “/usr/include/c++/4.4/x86_64-suse-linux/”
ignoring nonexistent directory “/usr/include/c++/4.4/backward”
ignoring nonexistent directory “/usr/include/c++/4.3.1”
ignoring nonexistent directory “/usr/include/c++/4.3.1/i686-pc-linux-gnu/”
ignoring nonexistent directory “/usr/include/c++/4.3.1/backward”
ignoring nonexistent directory “/usr/include/c++/4.3.1”
ignoring nonexistent directory “/usr/include/c++/4.3.1/x86_64-unknown-linux-gnu/”
ignoring nonexistent directory “/usr/include/c++/4.3.1/backward”
ignoring nonexistent directory “/usr/lib/gcc/i686-pc-linux-gnu/4.3.4/include/g+±v4”
ignoring nonexistent directory “/usr/lib/gcc/i686-pc-linux-gnu/4.3.4/include/g+±v4/i686-pc-linux-gnu/”
ignoring nonexistent directory “/usr/lib/gcc/i686-pc-linux-gnu/4.3.4/include/g+±v4/backward”
ignoring nonexistent directory “/usr/lib/gcc/i686-pc-linux-gnu/4.3.2/include/g+±v4”
ignoring nonexistent directory “/usr/lib/gcc/i686-pc-linux-gnu/4.3.2/include/g+±v4/i686-pc-linux-gnu/”
ignoring nonexistent directory “/usr/lib/gcc/i686-pc-linux-gnu/4.3.2/include/g+±v4/backward”
ignoring nonexistent directory “/usr/lib/gcc/i686-pc-linux-gnu/4.1.2/include/g+±v4”
ignoring nonexistent directory “/usr/lib/gcc/i686-pc-linux-gnu/4.1.2/include/g+±v4/i686-pc-linux-gnu/”
ignoring nonexistent directory “/usr/lib/gcc/i686-pc-linux-gnu/4.1.2/include/g+±v4/backward”
ignoring nonexistent directory “/usr/include/c++/4.3”
ignoring nonexistent directory “/usr/include/c++/4.3/i486-pc-linux-gnu/”
ignoring nonexistent directory “/usr/include/c++/4.3/backward”
ignoring nonexistent directory “/usr/include/c++/4.3”
ignoring nonexistent directory “/usr/include/c++/4.3/i486-linux-gnu/”
ignoring nonexistent directory “/usr/include/c++/4.3/backward”
ignoring nonexistent directory “/usr/lib/gcc/x86_64-pc-linux-gnu/4.1.2/include/g+±v4”
ignoring nonexistent directory “/usr/lib/gcc/x86_64-pc-linux-gnu/4.1.2/include/g+±v4/i686-pc-linux-gnu/”
ignoring nonexistent directory “/usr/lib/gcc/x86_64-pc-linux-gnu/4.1.2/include/g+±v4/backward”
#include “…” search starts here:
#include <…> search starts here:
/usr/local/lib/clang/1.1/include
/usr/local/include
/usr/include

Andy_Wick · February 15, 2010, 10:27pm

I totally missed the --with-c-include-dirs= option, that does what I need.

Thanks,
Andy