llvm-gcc (GCC) 4.2.1 (Based on Apple Inc. build 5648) (LLVM build)
Hello all,
Duncan Sands wrote:
I figured perhaps the --with-llvm value I used was wrong (should it be
llvm build-dir or final installation dir?), but after trying different
values it still makes no difference. What would cause llvm-gcc to loose
the capability of writing out LLVM IR?maybe you built an llvm-gcc with LLVM disabled (in which case you get
an ordinary Apple GCC, or at least you're supposed to)? Did you specify
--enable-llvm when configuring GCC?
So I've now had multiple hints (from Duncan, Anton and Jim) that I need
--enable-llvm instead of --with-llvm. That clears up a lot of confusion,
but one thing still surprises me:
Using --with-llvm creates an llvm-gcc build that can't produce LLVM IR,
fine.
After building and installing this borked build I updated LLVM from SVN
and built it (not knowing llvm-gcc was broken).
During LLVM configure I now see this line:
checking whether llvm-gcc is sane... no
But still the LLVM build tries to use it, as the previously reported
runtime/libprofile problem pops up again due to my llvm-gcc not being
able to generate LLVM IR.
I guess I'm curious why even though configure is able to tell my
llvm-gcc is not behaving as it should it continues to be used it anyway.
Ah well, build systems ... the next complex thing after compilers,
right? 
Thanks for all the help everybody!
Paul