[LLVMdev] Build process ignores BUILD_CC?

[Frank Winter]

I applied the patch and tried again.. it didn't work.

However, if I modify the patch to pass on the variables to the configure 
script, like

           $(PROJ_SRC_DIR)/configure --build=$(BUILD_TRIPLE) \
                 --host=$(BUILD_TRIPLE) --target=$(BUILD_TRIPLE) \
                 --disable-polly CC=$(CC) CXX=$(CXX) AR=$(AR) AS=$(AS) 
LD=$(LD) $$configure_opts; \

then it works.

Looks like (at least) my system doesn't load the variables automatically.

It should be safe to include these additional changes. But I am not 100% 
sure.

Frank


On 03/19/2014 05:08 PM, Eric Christopher wrote:
> Meador posted a (quite old) patch yesterday that does this. I'll
> follow up in that thread.
>
> -eric
>
> On Wed, Mar 19, 2014 at 2:01 PM, Frank Winter <fwinter at jlab.org> wrote:
>> Hi,
>>
>> I am still struggling to cross-compile LLVM (using trunk).
>>
>> My cross compiler builds code that cannot be run on the
>> build host. Thus, I need to make use of BUILD_CC/CXX during
>> configuration.
>>
>> My current setup is (heavily boiled down):
>>
>> ../configure CC=cc_cross CXX=cxx_cross BUILD_CC=cc_host
>> BUILD_CXX=cxx_host (plus other flag stuff)
>>
>> The configuration runs fine. However, when calling 'make' it
>> would construct the BuildTools in a way that doesn't pick
>> up the host compilers:
>>
>> make
>> llvm[0]: Constructing LLVMBuild project information.
>>
>> Looking into BuildTools/config.log I see a mere:
>>
>> ../configure --build=.. --host=.. --target=.. --disable-polly
>>
>> Configuration fails of course, because it picks up the
>> host gcc which in my case has no C++11 support. Thus the
>> whole thing fails.
>>
>> Am I right in thinking that in the BuildTools/ project it
>> would be the right thing to do to copy the BUILD_* variables
>> from the configuration as
>>
>> BUILD_CC -> CC
>> BUILD_CXX -> CXX
>> (dito for the flags)?
>>
>> If that's the case, then non of this is happening.
>>
>> Thanks for your thoughts,
>> Frank
>>
>>
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