Ubuntu 16.04: Build LLVM/Clang from svn repository

Install package for building LLVM/Clang with apt. LLVM/Clang does not support configure now. You need to use cmake.

$ sudo apt-get build-dep -y llvm clang
$ sudo apt-get install -y subversion cmake

Acording to Clang page, download source code except libcxx.

$ svn co http://llvm.org/svn/llvm-project/llvm/trunk llvm
$ cd llvm/tools
$ svn co http://llvm.org/svn/llvm-project/cfe/trunk clang
$ cd clang/tools
$ svn co http://llvm.org/svn/llvm-project/clang-tools-extra/trunk extra
$ cd ../../../projects
$ svn co http://llvm.org/svn/llvm-project/compiler-rt/trunk compiler-rt
$ cd ../..

Create build directory, build LLVM/Clang as a release binary and install binary to /usr/local.

$ mkdir llvm.build
$ cd llvm.build
$ cmake -G "Unix Makefiles" \
-DCMAKE_BUILD_TYPE=Release \
-DCMAKE_INSTALL_PREFIX=/usr/local ../llvm
$ make
$ sudo make install

Compile c source code.

$ /usr/local/bin/clang --version
clang version 3.9.0 (trunk 268858)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
$ echo '#include <stdio.h>
int main(void) { printf("hello\n"); return 0; }' > hello.c
$ /usr/local/bin/clang -v hello.c -o hello
clang version 3.9.0 (trunk 268858)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.3.1
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.0.0
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.3.1
Candidate multilib: .;@m64
Selected multilib: .;@m64
 "/usr/local/bin/clang-3.9" -cc1 -triple x86_64-unknown-linux-gnu
-emit-obj -mrelax-all -disable-free -disable-llvm-verifier
-discard-value-names -main-file-name hello.c -mrelocation-model static
-mthread-model posix -mdisable-fp-elim -fmath-errno -masm-verbose
-mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu
x86-64 -v -dwarf-column-info -debugger-tuning=gdb -resource-dir
/usr/local/bin/../lib/clang/3.9.0 -internal-isystem /usr/local/include
-internal-isystem /usr/local/bin/../lib/clang/3.9.0/include
-internal-externc-isystem /usr/include/x86_64-linux-gnu
-internal-externc-isystem /include -internal-externc-isystem
/usr/include -fdebug-compilation-dir /home/hiroom2 -ferror-limit 19
-fmessage-length 90 -fobjc-runtime=gcc -fdiagnostics-show-option
-fcolor-diagnostics -o /tmp/hello-d0d56a.o -x c hello.c
clang -cc1 version 3.9.0 based upon LLVM 3.9.0svn default target
x86_64-unknown-linux-gnu
ignoring nonexistent directory "/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/include
 /usr/local/bin/../lib/clang/3.9.0/include
 /usr/include/x86_64-linux-gnu
 /usr/include
End of search list.
 "/usr/bin/ld" -z relro --hash-style=gnu --build-id --eh-frame-hdr -m
elf_x86_64 -dynamic-linker /lib64/ld-linux-x86-64.so.2 -o hello
/usr/lib/gcc/x86_64-linux-gnu/5.3.1/../../../x86_64-linux-gnu/crt1.o
/usr/lib/gcc/x86_64-linux-gnu/5.3.1/../../../x86_64-linux-gnu/crti.o
/usr/lib/gcc/x86_64-linux-gnu/5.3.1/crtbegin.o
-L/usr/lib/gcc/x86_64-linux-gnu/5.3.1
-L/usr/lib/gcc/x86_64-linux-gnu/5.3.1/../../../x86_64-linux-gnu
-L/lib/x86_64-linux-gnu -L/lib/../lib64 -L/usr/lib/x86_64-linux-gnu
-L/usr/lib/gcc/x86_64-linux-gnu/5.3.1/../../.. -L/usr/local/bin/../lib
-L/lib -L/usr/lib /tmp/hello-d0d56a.o -lgcc --as-needed -lgcc_s
--no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed
/usr/lib/gcc/x86_64-linux-gnu/5.3.1/crtend.o /usr/lib/gcc/x86_64-linux-gnu/5.3.1/../../../x86_64-linux-gnu/crtn.o
$ ./hello
hello