[Mesa-dev] [PATCHES] clang compatibility

[nobled]

The first three attached patches make it possible to compile Mesa with
LLVM/Clang:
1. Add -lstdc++ when linking glsl_compiler and glcpp
2. Move -lstdc++ from the Gallium-specific Makefile.dri to
DRI_LIB_DEPS in configure (fixes linking classic Mesa drivers)
3. Since autoconf gives GCC=yes even when using clang (since it just
tests for the __GNUC__ macro), don't check for a minimum version of
3.3 if $(CC) points to a clang executable. (unfortunately I'm not sure
how to properly detect clang, short of test-compiling a file that
contains #ifdef __clang__. I.e. if $(CC) = 'cc', and 'cc' is an
alternatives symlink to llvm-clang, this doesn't detect that case.)

The rest are just fixes to compiler warnings:
4. dri: Fix implicit declaration
5. program: Fix struct/class confusion
6. dr/radeon: Fix printf format
7. llvmpipe: Fix memory leak

With the first three patches, I can compile Mesa with clang 2.7 in
Ubuntu Lucid if I export three variables before configure:
export CC=llvm-clang
export CXX=llvm-clang
export CPPFLAGS=/usr/lib/clang/1.1/include
./configure
(Yeah, the third one is really prone to breakage with new versions and
I'm still trying to figure out how to not need it; it should also get
passed as part of MKDEP_OPTIONS in configure.ac, TBH.)
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