[LLVMdev] [PATCH] Use GCC_INSTALL_PREFIX for rpath if set.

[Russell Harmon]

The behavior of automatically detecting libraries installed in the same
prefix feels like magic to me anyway. Perhaps it would be better to have
project-level variables for specifying the path to them individually? The
default value for them could remain as origin/../lib which would keep from
breaking things.

On Thu May 29 2014 at 7:06:17 PM, Chandler Carruth <chandlerc at google.com>
wrote:

> This looks like it would remove the origin/../lib RPATH which would break
> finding libraries related to Clang such as libc++?
>
> It makes sense to add the GCC install prefix to the RPATH though. I
> wonder, should we try to do something about the lib vs. lib{32,64}
> business? I don't know that either of these does the right thing there.
>
>
> On Thu, May 29, 2014 at 3:37 PM, Russell Harmon <eatnumber1 at google.com>
> wrote:
>
>> This way, an LLVM compiled after setting GCC_INSTALL_PREFIX will work
>> correctly
>> if you don't want to install LLVM into the GCC_INSTALL_PREFIX.
>> ---
>>  CMakeLists.txt | 7 ++++++-
>>  1 file changed, 6 insertions(+), 1 deletion(-)
>>
>> diff --git a/CMakeLists.txt b/CMakeLists.txt
>> index 9ec3e33..c85a028 100644
>> --- a/CMakeLists.txt
>> +++ b/CMakeLists.txt
>> @@ -450,7 +450,12 @@ if (APPLE)
>>    set(CMAKE_INSTALL_RPATH "@executable_path/../lib")
>>  else(UNIX)
>>    if(NOT DEFINED CMAKE_INSTALL_RPATH)
>> -    set(CMAKE_INSTALL_RPATH "\$ORIGIN/../lib")
>> +    if(DEFINED GCC_INSTALL_PREFIX)
>> +      set(CMAKE_INSTALL_RPATH "${GCC_INSTALL_PREFIX}/lib")
>> +    else()
>> +      set(CMAKE_INSTALL_RPATH "\$ORIGIN/../lib")
>> +    endif()
>> +
>>      if (${CMAKE_SYSTEM_NAME} MATCHES FreeBSD)
>>        set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS}
>> -Wl,-z,origin")
>>      endif()
>>
> --
>> 1.9.1.423.g4596e3a
>>
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>>
>
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