[LLVMdev] llvm trunk build failed in cmake_install.cmake on ARM platform

[Rafael Avila de Espindola]

We try to change cmake's behaviour so that it uses $ORIGIN in the rpath, making the binaries relocatable. That might be falling in here for some reason.

Sent from my iPhone

> On Feb 12, 2014, at 11:07, Brad King <brad.king at kitware.com> wrote:
> 
>> On 02/12/2014 08:08 AM, Mathias Bauer wrote:
>> Hi dear list,
>> 
>> I tried to build llvm+clang on an OpenSuse BuildServer for ARM. The 
>> build was carried out with CMake 2.8.11. In the installation step I got 
>> the following error:
>> 
>>> [26815s] -- Installing: /home/abuild/rpmbuild/BUILDROOT/llvm-3.4.99-336.1.arm/usr/lib/libLLVMSupport.so
>>> [26815s] CMake Error at lib/Support/cmake_install.cmake:45 (FILE):
>>> [26815s]   file RPATH_CHANGE could not write new RPATH:
>>> [26815s]
>>> [26815s]     $ORIGIN/../lib
>>> [26815s]
>>> [26815s]   to the file:
>>> [26815s]
>>> [26815s]     /home/abuild/rpmbuild/BUILDROOT/llvm-3.4.99-336.1.arm/usr/lib/libLLVMSupport.so
>>> [26815s]
>>> [26815s]   No valid ELF RPATH or RUNPATH entry exists in the file;
> 
> CMake by default links binaries in the build tree such that they can
> be run immediately with no special environment by using RPATH/RUNPATH.
> Then at installation time it has a builtin ELF editor that replaces
> the build-tree RPATH with one for the install tree as specified by
> the INSTALL_RPATH target property:
> 
> http://www.cmake.org/cmake/help/v2.8.12/cmake.html#prop_tgt:INSTALL_RPATH
> 
> When the desired install-tree RPATH is longer than the build tree
> one then CMake adds bogus content to the end of the RPATH value for
> the build tree to reserve space.
> 
> I'm not familiar with the tools for the platform in question, but
> some linkers have a security feature that drops RPATH values that
> are invalid.  This sometimes trips up CMake's attempt at reserving
> space for the install-tree RPATH.  One may work around the problem
> by telling CMake to build directly with the install-tree RPATH:
> 
> http://www.cmake.org/cmake/help/v2.8.12/cmake.html#variable:CMAKE_BUILD_WITH_INSTALL_RPATH
> http://www.cmake.org/cmake/help/v2.8.12/cmake.html#prop_tgt:BUILD_WITH_INSTALL_RPATH
> 
> The cost is one may not be able to run the binaries from the build
> tree.  To set this for the whole build without modifying the source,
> just add -DCMAKE_BUILD_WITH_INSTALL_RPATH=1 to the cmake command line
> when configuring the project.
> 
> -Brad
> 
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