In macOS Sierra, installation for xgboost with openmp enabled always fails.
From https://xgboost.readthedocs.io/en/latest/build.html,
I've tried:
cp make/config.mk ./config.mk; make -j4
With,
export CC=/usr/local/Cellar/llvm/4.0.0_1/bin/clang
export CXX=/usr/local/Cellar/llvm/4.0.0_1/bin/clang++
export CXX1X=/usr/local/Cellar/llvm/4.0.0_1/bin/clang++
It fails with,
clang-4.0clang-4.0: : warning: argument unused during compilation: '-pthread' [-Wunused-command-line-argument]warning:
argument unused during compilation: '-pthread' [-Wunused-command-line-argument]
ld: library not found for -lomp
ld: library not found for -lomp
clang-4.0: error: linker command failed with exit code 1 (use -v to see invocation)
llvm support openmp, but it fails with ld: library not found for -lomp
related question
Install xgboost on Mac - ld: library not found
But, clang-omp goes to boneyard, and discontinue with llvm's OpenMP support.
I've drilled down to, (with -v option)
/usr/local/Cellar/llvm/4.0.0_1/bin/clang++ -std=c++11 -Wall -Wno-unknown-pragmas -Iinclude -Idmlc-core/include -Irabit/include -I/include -O3 -funroll-loops -msse2 -fPIC -fopenmp -shared -o lib/libxgboost.so build/learner.o build/logging.o build/c_api/c_api.o build/c_api/c_api_error.o build/common/common.o build/common/hist_util.o build/data/data.o build/data/simple_csr_source.o build/data/simple_dmatrix.o build/data/sparse_page_dmatrix.o build/data/sparse_page_raw_format.o build/data/sparse_page_source.o build/data/sparse_page_writer.o build/gbm/gblinear.o build/gbm/gbm.o build/gbm/gbtree.o build/metric/elementwise_metric.o build/metric/metric.o build/metric/multiclass_metric.o build/metric/rank_metric.o build/objective/multiclass_obj.o build/objective/objective.o build/objective/rank_obj.o build/objective/regression_obj.o build/tree/tree_model.o build/tree/tree_updater.o build/tree/updater_colmaker.o build/tree/updater_fast_hist.o build/tree/updater_histmaker.o build/tree/updater_prune.o build/tree/updater_refresh.o build/tree/updater_skmaker.o build/tree/updater_sync.o dmlc-core/libdmlc.a rabit/lib/librabit.a -pthread -lm -fopenmp
SOLVED
cd /usr/local/lib
ln -s /usr/local/Cellar/llvm/4.0.0_1/lib/libomp.dylib libomp.dylib
llvm installation miss its symbolic link.
In my case I solved adding the following linker flag in addition to -lomp:
-Lpath_to_libomp.dylib_folder
or something like:
-Llib/
In my case I used a version of clang that came with Homebrew's llvm instead of the one that came with the Laptop from the factory, and it worked.
Related
I want to use opemmp with clang compile in Windows and here is my compile command：
clang++ 1.cpp -o 1.exe -fopenmp=libomp -I=\"C:\\Program Files\\LLVM\\lib\\clang\\9.0.0\\include\" -L=\"C:\\Program Files\\LLVM\\bin\" -Wall -g -O2 -static-libgcc --target=x86_64-w64-mingw -std=c++17
and there is an error:
C:\Program Files\mingw-w64\x86_64-8.1.0-posix-seh-rt_v6-rev0\mingw64\bin\ld.exe: cannot find -lomp
clang: error: linker command failed with exit code 1 (use -v to see invocation)
but I have the "libomp.lib" file and write the link path in command argument. How to solve it?
Thanks!
I am building with Clang 9.0.0 and linking with the ld.lld linker
clang++.exe -Wall -fexceptions -m64 -O3 -Xclang -flto-visibility-public-std -std=c++2a -flto=thin -c
I:\Cpp\hello_boost\hello_codeblocks_world\hello_codeblocks_world.cpp -o obj\release\hello_codeblocks_world.o
clang++.exe -o bin\release\hello_codeblocks_world.exe obj\release\hello_codeblocks_world.o -m64 -fuse-ld=lld --strip-all
but, unlike when using the usual GCC linker LD, this option (--strip-all or -s) is not recognized
clang++: error: unsupported option '--strip-all' (or similarly with -s)
Can anyone suggest what I should be doing to strip symbols?
(My release-mode hello_world.exe size is 15 kb for GC but 230 kB for Clang :-( and this is likely to have some adverse effects for no benefit).
Is this not an option for ld.lld ?
Thanks
You might want to use:
-Xlinker --strip-all
You can use this to supply system-specific linker options that GCC does not recognize (gcc manual)
https://gcc.gnu.org/onlinedocs/gcc/Link-Options.html
I have tried to install GMP Library Version 6.1.0 for iOS9.
I need to compile GMP in iOS for a math project. My configuration command was like this.
./configure CC=clang CPP="/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -E" CPPFLAGS="-isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/ -fembed-bitcode -miphoneos-version-min=7.0 -arch armv7 -target arm-apple-darwin" --host=aarch64-apple-darwin --disable-assembly --enable-static --disable-shared --disable-thread-safe --enable-cxx
Found this configure option in :This link.
Here is my environment details:
Mac OSX 10.11.2; Xcode7.2; iOS SDK 9.2
During "configure" state it shows one warning
configure: WARNING: unrecognized options: --disable-thread-safe
But it configures without any error.
Configure summary:
configure: summary of build options:
Version: GNU MP 6.1.0
Host type: aarch64-apple-darwin
ABI: standard
Install prefix: /usr/local
Compiler: clang
Static libraries: yes
Shared libraries: no
After that I run make command.
Then make check.
While running make check command it gives the following error.
or, in text form:
/bin/sh ../libtool --tag=CC --mode=link clang -mfpu=neon -O2 -pedantic -DNO_ASM -o t-bswap t-bswap.o libtests.la ../libgmp.la
libtool: link: clang -mfpu=neon -O2 -pedantic -DNO_ASM -o t-bswap t-bswap.o ./.libs/libtests.a [redacted]/Documents/gmp-6.1.0/.libs/libgmp.a ../.libs/libgmp.a
ld: warning: ld: warning: ignoring file ./.libs/libtests.a, file was built for archive which is not the architecture being linked (x86_64): ./.libs/libtests.aignoring file t-bswap.o, file was built for armv7 which is not the architecture being linked (x86_64): t-bswap.o
ld: warning: ignoring file [redacted]/Documents/gmp-6.1.0/.libs/libgmp.a, file was built for archive which is not the architecture being linked (x86_64): /Users/[redacted]/Documents/gmp-6.1.0/.libs/libgmp.a
ld: warning: ignoring file ../.libs/libgmp.a, file was built for archive which is not the architecture being linked (x86_64): ../.libs/libgmp.a
Undefined symbols for architecture x86_64:
"_main", referenced from:
implicit entry/start for main executable
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[4]: *** [t-bswap] Error 1
make[3]: *** [check-am] Error 2
make[2]: *** [check-recursive] Error 1
make[1]: *** [check-recursive] Error 1
make: *** [check] Error 2
I am stuck here. Your help is highly appreciated.
[EDITED]
i'm building llvm/clang 3.7 with bitcode support (-fembed-bitcode). Some modules can't be linked due to error:
ld: -bundle and -bitcode_bundle (Xcode setting ENABLE_BITCODE=YES)
cannot be used together clang: error: linker command failed with exit
code 1 (use -v to see invocation)
Full error output:
Linking CXX shared module ../../lib/BugpointPasses.dylib cd
/Volumes/Transcend/dev/src/llvm_37_ios_any_build/tools/bugpoint-passes
&& /usr/local/Cellar/cmake/2.8.12.2/bin/cmake -E cmake_link_script
CMakeFiles/BugpointPasses.dir/link.txt --verbose=1 /usr/bin/c++
-fembed-bitcode -Os -std=c++11 -stdlib=libc++ -arch arm64 -mios-version-min=8.0 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk
-Wall -W -Wno-unused-parameter -Wwrite-strings -Wcast-qual -pedantic -Wno-long-long -Wnon-virtual-dtor -O3 -DNDEBUG -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk
-bundle -Wl,-headerpad_max_install_names -Wl,-dead_strip -Wl,-exported_symbols_list,/Volumes/Transcend/dev/src/llvm_37_ios_any_build/tools/bugpoint-passes/BugpointPasses.exports
-Wl,-flat_namespace -Wl,-undefined -Wl,suppress -o ../../lib/BugpointPasses.dylib
CMakeFiles/BugpointPasses.dir/TestPasses.cpp.o
-Wl,-rpath,#executable_path/../lib ld: -bundle and -bitcode_bundle (Xcode setting ENABLE_BITCODE=YES) cannot be used together clang:
error: linker command failed with exit code 1 (use -v to see
invocation) make[2]: * [lib/BugpointPasses.dylib] Error 1 make[1]:
* [tools/bugpoint-passes/CMakeFiles/BugpointPasses.dir/all] Error 2 make: *** [all] Error 2
It seems that -bundle is added by CMake as i was not able to find it in CMakeLists.txt and -bitcode_bundle is added by SDK because of -fembed-bitcode.
How can i fix it? Any workaround (f.e. to switch off dylibs building since i don't need them)?
Check that you are not using Bundle loader in any of your projects:
and set match-O type to Executable instead of Bundle
Hope that helps, I had the same problem and fixed it
Set the Enable Bitcode build setting to No for your debug configuration:
If you don't see the Enable Bitcode option, make sure BaseSDK is set to either iOS, tvOS, or watchOS.
recently I updated my armadillo to version 5.200.1, but when i tried to compile my code using
g++ -std=c++11 -m64 -O3 -Wall -I. -I/opt/OpenBLAS/include -fopenmp -o code.cpp.o -c code.cpp
g++ -std=c++11 -m64 -O3 -Wall -I. -I/opt/OpenBLAS/include -fopenmp -o main.cpp.o -c main.cpp
g++ -std=c++11 -m64 -O3 -o code.cpp.o main.cpp.o -lgomp -L/opt/OpenBLAS/lib -lopenblas -larmadillo
I got error message in the final linking step
/usr/lib/gcc/x86_64-linux-gnu/4.9/../../../../lib/libarmadillo.so:
undefined reference to `pthread_atfork'
collect2: error: ld returned 1 exit status
make: *** [a.out] Error 1
This error appears in my machine with Ubuntu 14.04LTS + gcc 4.9.2.
The Armadillo itself is linked with OpenBLAS 0.2.14 (I followed the procedure provided by Armadillo in installation)
such error doesn't occur in my macosx laptop (the same library). It means something problems with my ubuntu machine. I tried to re-install the Armadillo 4.650.2 (this version worked before), but the same error kept appearing (now older doesn't work like before). The only thing that i did before updating those libraries were "apt-self update" and "apt-self upgrade" of my ubuntu machine
is there any suggestion to fix this problem?
I also use armadillo on Ubuntu Linux
I had the same problem first when I started to program with armadillo. For g++ I only had to add -larmadillo as command line option. such as this
g++ -O2 -o armadillo_example armadillo_example.cpp -larmadillo