[Bug 88209] HAVE_LLVM undelcared in r600_pipe_common.c if enable_r600_llvm not set

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=88209

--- Comment #3 from athomas@synexxus.com ---
The patch seems to be in the right direction of removing the dependance of 
LLVM in the source code, but I dont have hardware to test functionality. I can
test that it compiles when LLVM isn't specified on Monday. I don't have enough 
knowledge on the internal workings of the driver to make comments on the
implications of the code chages though. 

A couple of notes I meant to add last night:

Build Environment:

- Building directly on an ARM platform. imx6 - very similar to sabrelite.
- I set the prefix to be someplace in my /home directory via the X.org build.sh
script.
- Flags: --enable-driglx-direct --enable-gles1 --enable-gles2 --enable-glx
--with-dri-drivers=radeon

Additional notes about the mesa build with llvm:

Normally the auto setting for enable_gallium_llvm will set
enable_gallium=llvm=yes and trigger llvm to be used with the driver. This is
NOT the case if the host CPU is not i*86/x96_64/AMD64. See the current snippet
below from configure.ac


if test "x$enable_gallium_llvm" = xauto; then
    case "$host_cpu" in
    i*86|x86_64|amd64) enable_gallium_llvm=yes;;
    esac
fi

Tests I did:
- I hacked the configure.ac to always set enable_gallium_llvm=yes and was able
to get the gallium r600 driver to build and subsquently mesa. 
- I, somewhat stupidly, tested --with-dri-drivers=nouveau and not
--with-gallium-drivers=nouveau because I dont care about the drivers - I will
end up using Freescale/Vivante drivers. BUT - can the two be aligned or at
least checked for inconsistencies.

Questions:
- Does it make sense to migrate the default to use LLVM for ARM platforms? 

At the end of the day I didnt really care about the drivers themselves because
I will be dropping in Vivante drivers via Freescale, but I needed mesa/gallium
to build. I should have cut the gallium drivers out, but I was concerned I had
my build environment/paths setup correctly.

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