[saucy] c++config.h missing in i386

Status changed to 'Confirmed' because the bug affects multiple users.

A few details might be relevant here. The directory searched for some of C/C++ standard headers (libstdc++) is wrong for i386/i686 (it should search /usr/include/c++/4.8 and /usr/include/i386-linux-gnu/c++/4.8);

(1) /usr/include/c++/4.8 is searched
(2) /usr/include/i386-linux-gnu/c++/4.8 is __NOT__ searched

A workaround is to add an additional include search path (if you are using 4.8) when compiling with clang++:
    -I/usr/include/i386-linux-gnu/c++/4.8
----------------------------------------------------------
the warning below during the compile command (highlights the problem):
   ignoring nonexistent directory "/usr/lib/gcc/i686-linux-gnu/4.8/../../../../include/i686-linux-gnu/c++/4.8"
----------------------------------------------------------

Compiling on i386/686 (Saucy), using clang++ -v ....:

clang++ -v -Wno-deprecated -Woverloaded-virtual -Wall -W -Wextra -Wshadow -ggdb3 -O3 -c random_base_impl.cpp -DTRACEOUT -I. --std=c++11 -o random_base_impl.o
Ubuntu clang version 3.4-1ubuntu1 (trunk) (based on LLVM 3.4)
Target: i386-pc-linux-gnu
Thread model: posix
 "/usr/bin/clang" -cc1 -triple i386-pc-linux-gnu -emit-obj -disable-free -disable-llvm-verifier -main-file-name random_base_impl.cpp -mrelocation-model static -fmath-errno -masm-verbose -mconstructor-aliases -fuse-init-array -target-cpu pentium4 -target-linker-version 2.23.52.20130727 -momit-leaf-frame-pointer -v -g -coverage-file /home/gking/Programming/mystudy_without_photon_cut/epc_cpp/test/epc_test/refactoring/random_base_impl.o -resource-dir /usr/bin/../lib/clang/3.4 -D TRACEOUT -I . -internal-isystem /usr/lib/gcc/i686-linux-gnu/4.8/../../../../include/c++/4.8 -internal-isystem /usr/lib/gcc/i686-linux-gnu/4.8/../../../../include/c++/4.8/i686-linux-gnu -internal-isystem /usr/lib/gcc/i686-linux-gnu/4.8/../../../../include/c++/4.8/backward -internal-isystem /usr/lib/gcc/i686-linux-gnu/4.8/../../../../include/i686-linux-gnu/c++/4.8 -internal-isystem /usr/local/include -internal-isystem /usr/bin/../lib/clang/3.4/include -internal-isystem /usr/include/clang/3.4/include/ -internal-externc-isystem /usr/include/i386-linux-gnu -internal-externc-isystem /usr/include/i686-linux-gnu -internal-externc-isystem /usr/include -O3 -Wno-deprecated -Woverloaded-virtual -Wall -W -Wextra -Wshadow --std=c++11 -fdebug-compilation-dir /home/gking/Programming/mystudy_without_photon_cut/epc_cpp/test/epc_test/refactoring -ferror-limit 19 -fmessage-length 213 -mstackrealign -fobjc-runtime=gcc -fobjc-default-synthesize-properties -fcxx-exceptions -fexceptions -fdiagnostics-show-option -fcolor-diagnostics -backend-option -vectorize-loops -o random_base_impl.o -x c++ random_base_impl.cpp
clang -cc1 version 3.4 based upon LLVM 3.4 default target i386-pc-linux-gnu
ignoring nonexistent directory "/usr/lib/gcc/i686-linux-gnu/4.8/../../../../include/c++/4.8/i686-linux-gnu"
ignoring nonexistent directory "/usr/lib/gcc/i686-linux-gnu/4.8/../../../../include/i686-linux-gnu/c++/4.8"
ignoring nonexistent directory "/usr/bin/../lib/clang/3.4/include"
ignoring nonexistent directory "/usr/include/i686-linux-gnu"
#include "..." search starts here:
#include <...> search starts here:
 .
 /usr/lib/gcc/i686-linux-gnu/4....

This appears to be a familiar bug, that was already fixed at some point.

http://llvm.org/bugs/show_bug.cgi?id=11223#c11

This is the revision referenced in the bug report.

http://llvm.org/viewvc/llvm-project?view=revision&revision=144165

I have installed clang-3.4 from the official repositories - same problem.

http://llvm.org/apt/

clang-3.4 is provided by llvm-toolchain-snapshot. The same problem is also present on clang-3.3.

In clang-3.5 this is fixed.

http://llvm.org/apt/

I believe this bug is fixed in Ubuntu 14.04.
I have the same kind of clang compiler errors with Ubuntu 13.10 (i386).
They no longer occur with Ubuntu 14.04 (i386; using clang-3.4).