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<b>Resolution:</b> After doing an strace on the clang++ executable
generated from gcc builds of llvm/clang I discovered some polluted
gcc-4.7 intermixed and I had yet to install libstdc++6 (4.7) to
build against.<br>
<br>
After doing so clang/clang++ worked as expected and have been doing
so for well over a year of nightly builds from trunk.<br>
<br>
Unfortunately, I have a dilemma seeing as gcc/g++/cpp are all
presently configured by Debian to target gcc-4.6 and therefore
should not even have polluted the includes directories with anything
but libstdc++6 (4.6.3) but that is an issue for Debian who seems to
update it's libs in a mixed fashion without properly updating
updates-alternatives for gcc to point to gcc-4.7 or until they have
more of their distribution updated to hold both versions of
libstdc++6 for 4.6.3 and a differentiated naming convention for the
upcoming version, 4.7 instead of blatantly rewriting over the 4.6.3
libstdc++6 package with the 4.7 revision.<br>
<br>
- Marc<br>
<br>
On 03/27/2012 06:14 PM, Marc J. Driftmeyer wrote:
<blockquote cite="mid:4F726604.1060806@reanimality.com" type="cite">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<b>System:</b> Debian Linux Sid/Unstable amd64<br>
<br>
<b>LLVM/Clang:</b> Trunk<br>
<br>
<b>Scenario:</b> In the past couple of days I've been compiling
against trunk I get two separate and spurious hang ups with CMake.<br>
<br>
<b>Note:</b> I build against more than just X86 follow along the
progress of other platforms, though just building for X86 produces
the same results below.<br>
<br>
<b>Assumption:</b> Configure cmake with prior built clang and
clang++ via gcc-4.6.3 under /usr/local/bin... /clang .../clang++
as follows:<br>
<br>
<blockquote type="cite">mdriftmeyer@horus:~/DeveloperProjects/LLVMProject/cmake-llvm$
cmake -DCMAKE_BUILD_TYPE=MinSizeRel
-DCMAKE_CXX_COMPILER=/usr/local/bin/clang++
-DCMAKE_C_COMPILER=/usr/local/bin/clang -DCMAKE_CXX_FLAGS='-O2'
CMAKE_C_FLAGS='-O2' -DLLVM_BUILD_EXAMPLES=ON
-DLLVM_BUILD_TESTS=ON -DLLVM_INCLUDE_TESTS=ON
-DLLVM_TARGETS_TO_BUILD='ARM;CppBackend;PTX;Hexagon;X86'
../trunk/llvm/<br>
-- Target triple: x86_64-unknown-linux-gnu<br>
-- Native target architecture is X86<br>
-- Threads enabled.<br>
-- Building with -fPIC<br>
-- Constructing LLVMBuild project information<br>
-- Targeting ARM<br>
-- Targeting CppBackend<br>
-- Targeting PTX<br>
-- Targeting Hexagon<br>
-- Targeting X86<br>
-- Clang version: 3.1<br>
-- Configuring done<br>
You have changed variables that require your cache to be
deleted.<br>
Configure will be re-run and you may have to reset some
variables.<br>
The following variables have changed:<br>
CMAKE_C_COMPILER= /usr/local/bin/clang<br>
CMAKE_CXX_COMPILER= /usr/local/bin/clang++<br>
<br>
-- The C compiler identification is Clang<br>
-- The CXX compiler identification is Clang<br>
-- Check for working C compiler: /usr/local/bin/clang<br>
-- Check for working C compiler: /usr/local/bin/clang -- works<br>
-- Detecting C compiler ABI info<br>
-- Detecting C compiler ABI info - done<br>
-- Check for working CXX compiler: /usr/local/bin/clang++<br>
-- Check for working CXX compiler: /usr/local/bin/clang++ --
broken<br>
CMake Error at
/usr/share/cmake-2.8/Modules/CMakeTestCXXCompiler.cmake:45
(MESSAGE):<br>
The C++ compiler "/usr/local/bin/clang++" is not able to
compile a simple<br>
test program.<br>
<br>
It fails with the following output:<br>
<br>
Change Dir:
/home/mdriftmeyer/DeveloperProjects/LLVMProject/cmake-llvm/CMakeFiles/CMakeTmp<br>
<br>
<br>
<br>
Run Build Command:/usr/bin/make "cmTryCompileExec/fast"<br>
<br>
/usr/bin/make -f CMakeFiles/cmTryCompileExec.dir/build.make<br>
CMakeFiles/cmTryCompileExec.dir/build<br>
<br>
make[1]: Entering directory<br>
`/home/mdriftmeyer/DeveloperProjects/LLVMProject/cmake-llvm/CMakeFiles/CMakeTmp'<br>
<br>
<br>
/usr/bin/cmake -E cmake_progress_report<br>
/home/mdriftmeyer/DeveloperProjects/LLVMProject/cmake-llvm/CMakeFiles/CMakeTmp/CMakeFiles<br>
1<br>
<br>
Building CXX object
CMakeFiles/cmTryCompileExec.dir/testCXXCompiler.cxx.o<br>
<br>
/usr/local/bin/clang++ -o<br>
CMakeFiles/cmTryCompileExec.dir/testCXXCompiler.cxx.o -c<br>
/home/mdriftmeyer/DeveloperProjects/LLVMProject/cmake-llvm/CMakeFiles/CMakeTmp/testCXXCompiler.cxx<br>
<br>
<br>
Linking CXX executable cmTryCompileExec<br>
<br>
/usr/bin/cmake -E cmake_link_script<br>
CMakeFiles/cmTryCompileExec.dir/link.txt --verbose=1<br>
<br>
/usr/local/bin/clang++<br>
CMakeFiles/cmTryCompileExec.dir/testCXXCompiler.cxx.o -o
cmTryCompileExec<br>
-rdynamic<br>
<br>
/usr/bin/ld: error: cannot find -lstdc++<br>
<br>
clang-3: error: linker command failed with exit code 1 (use -v
to see<br>
invocation)<br>
<br>
make[1]: Leaving directory<br>
`/home/mdriftmeyer/DeveloperProjects/LLVMProject/cmake-llvm/CMakeFiles/CMakeTmp'<br>
<br>
<br>
make[1]: *** [cmTryCompileExec] Error 1<br>
<br>
make: *** [cmTryCompileExec/fast] Error 2<br>
<br>
<br>
<br>
<br>
<br>
CMake will not be able to correctly generate this project.<br>
Call Stack (most recent call first):<br>
CMakeLists.txt:3 (project)<br>
<br>
<br>
-- Configuring incomplete, errors occurred!<br>
mdriftmeyer@horus:~/DeveloperProjects/LLVMProject/cmake-llvm$</blockquote>
<br>
<br>
<br>
Now out of curriousity I change clang++ to clang-3.1 which of
course has two symlinks [clang and clang++] under /usr/local/bin<br>
<br>
If I configure and attempt to make against the following:<br>
<br>
<blockquote type="cite">mdriftmeyer@horus:~/DeveloperProjects/LLVMProject/cmake-llvm$
cmake -DCMAKE_BUILD_TYPE=MinSizeRel
-DCMAKE_CXX_COMPILER=/usr/local/bin/clang-3.1
-DCMAKE_C_COMPILER=/usr/local/bin/clang-3.1
-DCMAKE_CXX_FLAGS='-O2' CMAKE_C_FLAGS='-O2'
-DLLVM_BUILD_EXAMPLES=ON -DLLVM_BUILD_TESTS=ON
-DLLVM_INCLUDE_TESTS=ON
-DLLVM_TARGETS_TO_BUILD='ARM;CppBackend;PTX;Hexagon;X86'
../trunk/llvm/<br>
-- Target triple: x86_64-unknown-linux-gnu<br>
-- Native target architecture is X86<br>
-- Threads enabled.<br>
-- Building with -fPIC<br>
-- Constructing LLVMBuild project information<br>
-- Targeting ARM<br>
-- Targeting CppBackend<br>
-- Targeting PTX<br>
-- Targeting Hexagon<br>
-- Targeting X86<br>
-- Clang version: 3.1<br>
-- Configuring done<br>
-- Generating done<br>
-- Build files have been written to:
/home/mdriftmeyer/DeveloperProjects/LLVMProject/cmake-llvm<br>
mdriftmeyer@horus:~/DeveloperProjects/LLVMProject/cmake-llvm$</blockquote>
<br>
<b>Result:</b><br>
<br>
<blockquote type="cite">mdriftmeyer@horus:~/DeveloperProjects/LLVMProject/cmake-llvm$
make -j3<br>
Scanning dependencies of target LLVMHello<br>
[ 0%] Building CXX object
lib/Transforms/Hello/CMakeFiles/LLVMHello.dir/Hello.cpp.o
<br>
Scanning dependencies of target
profile_rt-shared
<br>
Scanning dependencies of target
LLVMSupport
<br>
[ 0%] Building C object
runtime/libprofile/CMakeFiles/profile_rt-shared.dir/BasicBlockTracing.c.o
<br>
In file included from
/home/mdriftmeyer/DeveloperProjects/LLVMProject/trunk/llvm/lib/Transforms/Hello/Hello.cpp:16:<br>
<b>/home/mdriftmeyer/DeveloperProjects/LLVMProject/trunk/llvm/include/llvm/Pass.h:32:10:
fatal error: 'string'<br>
file not found<br>
#include <string></b><br>
^<br>
[ 0%] Building CXX object
lib/Support/CMakeFiles/LLVMSupport.dir/APFloat.cpp.o
<br>
[ 0%] Building C object
runtime/libprofile/CMakeFiles/profile_rt-shared.dir/CommonProfiling.c.o
<br>
In file included from
/home/mdriftmeyer/DeveloperProjects/LLVMProject/trunk/llvm/lib/Support/APFloat.cpp:15:
<br>
In file included from
/home/mdriftmeyer/DeveloperProjects/LLVMProject/trunk/llvm/include/llvm/ADT/APFloat.h:104:<br>
In file included from
/home/mdriftmeyer/DeveloperProjects/LLVMProject/trunk/llvm/include/llvm/ADT/APInt.h:18:<br>
In file included from
/home/mdriftmeyer/DeveloperProjects/LLVMProject/trunk/llvm/include/llvm/ADT/ArrayRef.h:13:<br>
In file included from
/home/mdriftmeyer/DeveloperProjects/LLVMProject/trunk/llvm/include/llvm/ADT/SmallVector.h:17:<br>
In file included from
/home/mdriftmeyer/DeveloperProjects/LLVMProject/trunk/llvm/include/llvm/Support/type_traits.h:20:<br>
<b>/home/mdriftmeyer/DeveloperProjects/LLVMProject/cmake-llvm/include/llvm/Support/DataTypes.h:36:10:
fatal
error:
<br>
'cmath' file not found<br>
#include <cmath></b><br>
^<br>
[ 0%] Building C object
runtime/libprofile/CMakeFiles/profile_rt-shared.dir/GCDAProfiling.c.o
<br>
[ 0%] Building C object
runtime/libprofile/CMakeFiles/profile_rt-shared.dir/PathProfiling.c.o
<br>
1 error
generated.
<br>
make[2]: ***
[lib/Transforms/Hello/CMakeFiles/LLVMHello.dir/Hello.cpp.o]
Error 1<br>
make[1]: *** [lib/Transforms/Hello/CMakeFiles/LLVMHello.dir/all]
Error 2<br>
make[1]: *** Waiting for unfinished jobs....<br>
1 error generated.<br>
[ 0%] make[2]: ***
[lib/Support/CMakeFiles/LLVMSupport.dir/APFloat.cpp.o] Error 1<br>
make[1]: *** [lib/Support/CMakeFiles/LLVMSupport.dir/all] Error
2<br>
[ 0%] Building C object
runtime/libprofile/CMakeFiles/profile_rt-shared.dir/EdgeProfiling.c.o<br>
Building C object
runtime/libprofile/CMakeFiles/profile_rt-shared.dir/OptimalEdgeProfiling.c.o
<br>
Linking C shared library
../../lib/profile_rt.so
<br>
[ 0%] Built target
profile_rt-shared
<br>
make: *** [all] Error 2<br>
mdriftmeyer@horus:~/DeveloperProjects/LLVMProject/cmake-llvm$</blockquote>
<br>
Of course if I configure as follows:;<br>
<br>
<blockquote type="cite">mdriftmeyer@horus:~/DeveloperProjects/LLVMProject/cmake-llvm$
cmake -DCMAKE_BUILD_TYPE=MinSizeRel
-DCMAKE_CXX_COMPILER=/usr/bin/g++
-DCMAKE_C_COMPILER=/usr/bin/gcc -DCMAKE_CXX_FLAGS='-O2'
CMAKE_C_FLAGS='-O2' -DLLVM_BUILD_EXAMPLES=ON
-DLLVM_BUILD_TESTS=ON -DLLVM_INCLUDE_TESTS=ON
-DLLVM_TARGETS_TO_BUILD='ARM;CppBackend;PTX;Hexagon;X86'
../trunk/llvm/<br>
</blockquote>
<br>
<b>Results:</b> after rebuilding the cache and rerunning the
configuration twice the end is that LLVM/Clang <b>builds cleanly</b>.
None of the noise above about clang++ failing to be able to build
a simple c++ program nor the missing string and cmath header
files.<br>
<br>
Perhaps this is just a Debian Linux issue and has to do with
upgrades to LSB 4.1 [Linux Standard Base 4.1], but then I don't
know enough about LSB to know exactly how a compiler
infrastructure would be impacted by it, if at all. [<a
moz-do-not-send="true"
href="http://www.linuxfoundation.org/collaborate/workgroups/lsb/lsb-41-release-notes]">http://www.linuxfoundation.org/collaborate/workgroups/lsb/lsb-41-release-notes]</a><br>
<br>
NOTE: (The work on Libc++ under libcxx being put under /runtime
and recognized by Cmake is still not working, from what I've seen,
though work on it around 2 weeks prior was mentioned it would get
added for Linux)<br>
<br>
- Marc<br>
<div class="moz-signature">-- <br>
Marc J. Driftmeyer<br>
Email :: <a moz-do-not-send="true"
href="mailto:mjd@reanimality.com">mjd@reanimality.com</a><br>
Web :: <a moz-do-not-send="true"
href="http://www.reanimality.com">http://www.reanimality.com</a><br>
Cell :: (509) 435-5212 </div>
<br>
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</pre>
</blockquote>
<br>
<div class="moz-signature">-- <br>
Marc J. Driftmeyer<br>
Email :: <a href="mailto:mjd@reanimality.com">mjd@reanimality.com</a><br>
Web :: <a href="http://www.reanimality.com">http://www.reanimality.com</a><br>
Cell :: (509) 435-5212
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