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
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 > > > _______________________________________________ > LLVM Developers mailing list > LLVMdev at cs.uiuc.edu http://llvm.cs.uiuc.edu > http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
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
>>
>>
>> _______________________________________________
>> LLVM Developers mailing list
>> LLVMdev at cs.uiuc.edu http://llvm.cs.uiuc.edu
>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev