Re: JIT compiling with LLVM v10.0

> On 8 February 2018 at 10:29, Andreas Karlsson <andreas@proxel.se> wrote:
>> On 02/07/2018 03:54 PM, Andres Freund wrote:
>>
>> I've pushed v10.0. The big (and pretty painful to make) change is that
>> now all the LLVM specific code lives in src/backend/jit/llvm, which is
>> built as a shared library which is loaded on demand.
>
>
> It does not seem to be possible build without LLVM anymore.

Maybe I'm doing something wrong, but I also see some issues during compilation
even with llvm included (with gcc 5.4.0 and 7.1.0). Is it expected, do I need
to use another version to check it out?

    $ git rev-parse HEAD
    e24cac5951575cf86f138080acec663a0a05983e

    $ ./configure --prefix=/build/postgres-jit/ --with-llvm
--enable-debug --enable-depend --enable-cassert

    In file included from llvmjit_error.cpp:22:0:
    /usr/lib/llvm-5.0/include/llvm/Support/ErrorHandling.h:47:36:
warning: identifier 'nullptr' is a keyword in C++11 [-Wc++0x-compat]
                                        void *user_data = nullptr);
                                        ^
    In file included from /usr/include/c++/5/cinttypes:35:0,
                     from /usr/lib/llvm-5.0/include/llvm/Support/DataTypes.h:39,
                     from /usr/lib/llvm-5.0/include/llvm-c/Types.h:17,
                     from ../../../../src/include/jit/llvmjit.h:13,
                     from llvmjit_error.cpp:24:
    /usr/include/c++/5/bits/c++0x_warning.h:32:2: error: #error This
file requires compiler and library support for the ISO C++ 2011
standard. This support must be enabled with the -std=c++11 or
-std=gnu++11 compiler options.
     #error This file requires compiler and library support \
      ^
    In file included from llvmjit_error.cpp:22:0:
    /usr/lib/llvm-5.0/include/llvm/Support/ErrorHandling.h:47:54:
error: 'nullptr' was not declared in this scope
                                        void *user_data = nullptr);
                                                          ^
    /usr/lib/llvm-5.0/include/llvm/Support/ErrorHandling.h:57:56:
error: 'nullptr' was not declared in this scope
                                          void *user_data = nullptr) {
                                                            ^
    /usr/lib/llvm-5.0/include/llvm/Support/ErrorHandling.h:98:56:
error: 'nullptr' was not declared in this scope
                                          void *user_data = nullptr);
                                                            ^
    /usr/lib/llvm-5.0/include/llvm/Support/ErrorHandling.h:121:45:
error: 'nullptr' was not declared in this scope
     llvm_unreachable_internal(const char *msg = nullptr, const char
*file = nullptr,
                                                 ^
    /usr/lib/llvm-5.0/include/llvm/Support/ErrorHandling.h:121:73:
error: 'nullptr' was not declared in this scope
     llvm_unreachable_internal(const char *msg = nullptr, const char
*file = nullptr,
                                                                             ^
    ../../../../src/Makefile.global:838: recipe for target
'llvmjit_error.o' failed
    make[2]: *** [llvmjit_error.o] Error 1
    make[2]: Leaving directory '/postgres/src/backend/jit/llvm'
    Makefile:42: recipe for target 'all-backend/jit/llvm-recurse' failed
    make[1]: *** [all-backend/jit/llvm-recurse] Error 2
    make[1]: Leaving directory '/postgres/src'
    GNUmakefile:11: recipe for target 'all-src-recurse' failed
    make: *** [all-src-recurse] Error 2