Weird-- I'm also using the pre-built LLVM 3.7.0.
But doesn't it seem like gcc is the problem here instead of LLVM?
I'm running an up-to-date 14.04 Ubuntu which has the gcc below.
John
regehr@klein:~$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.8/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
4.8.4-2ubuntu1~14.04'
--with-bugurl=file:///usr/share/doc/gcc-4.8/README.Bugs
--enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.8 --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--with-gxx-include-dir=/usr/include/c++/4.8 --libdir=/usr/lib
--enable-nls --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes
--enable-gnu-unique-object --disable-libmudflap --enable-plugin
--with-system-zlib --disable-browser-plugin --enable-java-awt=gtk
--enable-gtk-cairo
--with-java-home=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64/jre
--enable-java-home
--with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64
--with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.8-amd64
--with-arch-directory=amd64
--with-ecj-jar=/usr/share/java/eclipse-ecj.jar --enable-objc-gc
--enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64
--with-multilib-list=m32,m64,mx32 --with-tune=generic
--enable-checking=release --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 4.8.4 (Ubuntu 4.8.4-2ubuntu1~14.04)
On 9/22/15 9:27 PM, Eric Eide wrote:
Eric, I was trying to build C-Reduce using g++ and it failed. This
can't be
correct behavior. This has always worked in the past.
Ah, I misunderstood. I assumed that you expected the test program to
be built
with clang++.
I see that the problem that is causing your configuration to fail is
this:
g++: error: unrecognized command line option
'-Wcovered-switch-default'
...which isn't supported by GCC, and so it fails. If your builds
worked until
now, I would assume that this option was recently introduced into your
installation of LLVM. Did you recently update the version of LLVM
that you're
compiling against?
I have been testing C-Reduce against prebuilt LLVM 3.7 binaries, which
don't
seem to have been built with this option. (Plus, I've been building
C-Reduce
with clang++-3.7 as well, which would grok the option.)
If this option has become a default for source builds of LLVM 3.7,
then yeah, a
lot of people are going to stumble over it, and we'll need to compensate.
I will check this by doing my own from-source LLVM 3.7 build, but I
won't be
able to do this until tomorrow.
Eric.