Added llvm-2.7 (clang is a subpkg) build template.

--HG--
extra : convert_revision : e2cfab9c10b455a3abd71aa5650fb0d358c61ba9

srcpkgs/llvm/template

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+# Template file for 'llvm'
+pkgname=llvm
+version=2.7
+distfiles="
+http://www.llvm.org/releases/${version}/llvm-${version}.tgz
+http://www.llvm.org/releases/${version}/clang-${version}.tgz"
+build_style=gnu_configure
+configure_args="--disable-expensive-checks --disable-debug-runtime
+--enable-targets=all --enable-bindings=none --enable-optimize
+--enable-shared --enable-libffi --enable-llvmc-dynamic
+PATH='/bin:/usr/bin:$PATH'"
+short_desc="Low Level Virtual Machine"
+maintainer="Juan RP <xtraeme@gmail.com>"
+checksum="
+99664bdc8503a306038166af33f28eb426d99e297575a59d74a1a0dcbddbbca5
+fb349471947f155c1cda1c8a4a3bbc7fa437b86f6875d9978f86c915dfed623a"
+
+long_desc="
+ Low Level Virtual Machine (LLVM) is:
+
+ 1. A compilation strategy designed to enable effective program optimization
+    across the entire lifetime of a program. LLVM supports effective
+    optimization at compile time, link-time (particularly interprocedural),
+    run-time and offline (i.e., after software is installed), while remaining
+    transparent to developers and maintaining compatibility with existing
+    build scripts.
+
+ 2. A virtual instruction set - LLVM is a low-level object code
+    representation that uses simple RISC-like instructions, but provides
+    rich, language-independent, type information and dataflow (SSA)
+    information about operands. This combination enables sophisticated
+    transformations on object code, while remaining light-weight enough to
+    be attached to the executable. This combination is key to allowing
+    link-time, run-time, and offline transformations.
+
+ 3. A compiler infrastructure - LLVM is also a collection of source code that
+    implements the language and compilation strategy. The primary components
+    of the LLVM infrastructure are a GCC-based C &amp; C++ front-end, a
+    link-time optimization framework with a growing set of global and
+    interprocedural analyses and transformations, static back-ends for many
+    popular (and some obscure) architectures, a back-end which emits portable
+    C code, and a Just-In-Time compilers for several architectures.
+
+ 4. LLVM does not imply things that you would expect from a high-level
+    virtual machine. It does not require garbage collection or run-time code
+    generation (In fact, LLVM makes a great static compiler!). Note that
+    optional LLVM components can be used to build high-level virtual machines
+    and other systems that need these services."
+
+subpackages="clang clang-devel llvm-docs"
+
+# XXX: Investigate bindings support.
+Add_dependency run libgcc
+Add_dependency run glibc
+Add_dependency run libstdc++
+Add_dependency run libffi
+Add_dependency build python
+Add_dependency build libffi-devel
+
+pre_configure()
+{
+	# Move clang files into the llvm source.
+	if [ -d ${XBPS_BUILDDIR}/clang-${version} ]; then
+		mv ${XBPS_BUILDDIR}/clang-${version} ${wrksrc}/tools/clang
+	fi
+}