Bug#794905: llvm-3.7-dev: Incorrect install prefix in installed LLVMConfig.cmake

[James Price]

Package: llvm-3.7-dev
Version: 1:3.7~+rc2-2
Severity: normal
Tags: patch

Dear Maintainer,

The LLVM_INSTALL_PREFIX variable set by LLVMConfig.cmake wrongly
assumes that the installed CMake configuration files are in a
subdirectory of the actual LLVM installation. The Debian package moves
the CMake configuration files to /usr/share/llvm-VERSION/, so this
assumption is not correct.

The way that the LLVM_INSTALL_PREFIX variable is determined has
changed in LLVM 3.7, and this issue for Debian was pointed out (along
with a proposed fix) by Brad King, here:

http://thread.gmane.org/gmane.comp.compilers.llvm.cvs/255502/focus=25574

The attached patch resolves this by essentially using the same
mechanism to determine LLVM_INSTALL_PREFIX as was used in LLVM
3.6. The resulting changes to the generated LLVMConfig.cmake match the
changes proposed by Brad above.

Many thanks,

James

-- System Information:
Debian Release: stretch/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.1.0-1-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages llvm-3.7-dev depends on:
ii  libc6          2.19-19
ii  libedit2       3.1-20150325-1
ii  libffi-dev     3.2.1-3
ii  libffi6        3.2.1-3
ii  libgcc1        1:5.2.1-14
ii  libjsoncpp0v5  0.10.5-1
ii  libllvm3.7     1:3.7~+rc2-2
ii  libstdc++6     5.2.1-14
ii  libtinfo-dev   5.9+20150516-2
ii  libtinfo5      5.9+20150516-2
ii  llvm-3.7       1:3.7~+rc2-2
ii  zlib1g         1:1.2.8.dfsg-2+b1

llvm-3.7-dev recommends no packages.

llvm-3.7-dev suggests no packages.

-- no debconf information
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