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Re: [ptp-user] Unresolved references in Eclipse PTP IDE

Greg,

Thank you for responding to me posting. I'm rather new to the Eclipse IDE and as far as I understand I'm using a managed project, so how do I add -fopenmp to the linker toolchain? But that begs the question, how is it that -fopenmp is not getting passed to the linker step when it does appear in the output in my original note?

Sam Dupree

On November/26/2018 20:31:30, Greg Watson wrote:
Hi Sam,

It looks like gfortran is not linking the OMP runtime library into the executable. It looks like the -fopenmp option is needed for the link step but it is not being added. If you're using a managed project then you should add this to the linker toolchain. If it's a makefile project, then add it to the linker link in the Makefile.

Regards,
Greg

On Nov 23, 2018, at 2:43 AM, Samuel Dupree <sdupree@xxxxxxxxxxxxx> wrote:


I've installed Eclipse PTP Version: 2018-09 (4.9.0), Build id: 20180917-1800 on a Mac Pro (Late 2013, desktop) running Mac OS X ver. 10.12.6 (Sierra). I've been able to figure out how to set most of the compiler options needed to run gfortran from within Eclipse. I'm attempting to run a simple example that uses OpenMP. See the file hello_openmp.f90 attached to this file.

The problem I'm having is how to resolve the unresolved references as indicted below.


02:30:33 **** Build of configuration Release for project Hello_OpenMP ****
make all
Building file: ../src/hello_openmp.f90
Using built-in specs.
Invoking: GNU Fortran Compiler
/usr/local/bin/gfortran -funderscoring -I/usr/local/Cellar/gcc/8.2.0/lib/gcc/8/gcc/x86_64-apple-darwin16.7.0/8.2.0/ -I/usr/local/Cellar/gcc/8.2.0/lib/gcc/8/gcc/x86_64-apple-darwin16.7.0/8.2.0/include -I/usr/local/Cellar/gcc/8.2.0/lib/gcc/8/gcc/x86_64-apple-darwin16.7.0/8.2.0/finclude -O3 -Wall -c -fmessage-length=0 -fopenmp -v -o "src/hello_openmp.o" "../src/hello_openmp.f90"
COLLECT_GCC=/usr/local/bin/gfortran
Target: x86_64-apple-darwin16.7.0
Configured with: ../configure --build=x86_64-apple-darwin16.7.0 --prefix=/usr/local/Cellar/gcc/8.2.0 --libdir=/usr/local/Cellar/gcc/8.2.0/lib/gcc/8 --enable-languages=c,c++,objc,obj-c++,fortran --program-suffix=-8 --with-gmp=/usr/local/opt/gmp --with-mpfr=/usr/local/opt/mpfr --with-mpc=/usr/local/opt/libmpc --with-isl=/usr/local/opt/isl --with-system-zlib --enable-checking=release --with-pkgversion='Homebrew GCC 8.2.0' --with-bugurl=https://github.com/Homebrew/homebrew-core/issues --disable-nls
Thread model: posix
gcc version 8.2.0 (Homebrew GCC 8.2.0)
COLLECT_GCC_OPTIONS='-funderscoring' '-I' '/usr/local/Cellar/gcc/8.2.0/lib/gcc/8/gcc/x86_64-apple-darwin16.7.0/8.2.0/' '-I' '/usr/local/Cellar/gcc/8.2.0/lib/gcc/8/gcc/x86_64-apple-darwin16.7.0/8.2.0/include' '-I' '/usr/local/Cellar/gcc/8.2.0/lib/gcc/8/gcc/x86_64-apple-darwin16.7.0/8.2.0/finclude' '-O3' '-Wall' '-c' '-fmessage-length=0' '-fopenmp' '-v' '-o' 'src/hello_openmp.o' '-mmacosx-version-min=10.12.0' '-asm_macosx_version_min=10.12' '-mtune=core2'
 /usr/local/Cellar/gcc/8.2.0/libexec/gcc/x86_64-apple-darwin16.7.0/8.2.0/f951 ../src/hello_openmp.f90 -I /usr/local/Cellar/gcc/8.2.0/lib/gcc/8/gcc/x86_64-apple-darwin16.7.0/8.2.0/ -I /usr/local/Cellar/gcc/8.2.0/lib/gcc/8/gcc/x86_64-apple-darwin16.7.0/8.2.0/include -I /usr/local/Cellar/gcc/8.2.0/lib/gcc/8/gcc/x86_64-apple-darwin16.7.0/8.2.0/finclude -fPIC -quiet -dumpbase hello_openmp.f90 -mmacosx-version-min=10.12.0 -mtune=core2 -auxbase-strip src/hello_openmp.o -O3 -Wall -version -funderscoring -fmessage-length=0 -fopenmp -fintrinsic-modules-path /usr/local/Cellar/gcc/8.2.0/lib/gcc/8/gcc/x86_64-apple-darwin16.7.0/8.2.0/finclude -o /var/folders/65/7cxpqns144q6wx5lyb7zcyh80000gq/T//ccO12HNa.s
GNU Fortran (Homebrew GCC 8.2.0) version 8.2.0 (x86_64-apple-darwin16.7.0)
    compiled by GNU C version 8.2.0, GMP version 6.1.2, MPFR version 4.0.1, MPC version 1.1.0, isl version isl-0.20-GMP

GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU Fortran2008 (Homebrew GCC 8.2.0) version 8.2.0 (x86_64-apple-darwin16.7.0)
    compiled by GNU C version 8.2.0, GMP version 6.1.2, MPFR version 4.0.1, MPC version 1.1.0, isl version isl-0.20-GMP

GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
COLLECT_GCC_OPTIONS='-funderscoring' '-I' '/usr/local/Cellar/gcc/8.2.0/lib/gcc/8/gcc/x86_64-apple-darwin16.7.0/8.2.0/' '-I' '/usr/local/Cellar/gcc/8.2.0/lib/gcc/8/gcc/x86_64-apple-darwin16.7.0/8.2.0/include' '-I' '/usr/local/Cellar/gcc/8.2.0/lib/gcc/8/gcc/x86_64-apple-darwin16.7.0/8.2.0/finclude' '-O3' '-Wall' '-c' '-fmessage-length=0' '-fopenmp' '-v' '-o' 'src/hello_openmp.o' '-mmacosx-version-min=10.12.0'  '-mtune=core2'
 as -arch x86_64 -v -I /usr/local/Cellar/gcc/8.2.0/lib/gcc/8/gcc/x86_64-apple-darwin16.7.0/8.2.0/ -I /usr/local/Cellar/gcc/8.2.0/lib/gcc/8/gcc/x86_64-apple-darwin16.7.0/8.2.0/include -I /usr/local/Cellar/gcc/8.2.0/lib/gcc/8/gcc/x86_64-apple-darwin16.7.0/8.2.0/finclude -force_cpusubtype_ALL -mmacosx-version-min=10.12 -o src/hello_openmp.o /var/folders/65/7cxpqns144q6wx5lyb7zcyh80000gq/T//ccO12HNa.s
Apple LLVM version 9.0.0 (clang-900.0.39.2)
Target: x86_64-apple-darwin16.7.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
 "/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang" -cc1as -triple x86_64-apple-macosx10.12.0 -filetype obj -main-file-name ccO12HNa.s -target-cpu penryn -I /usr/local/Cellar/gcc/8.2.0/lib/gcc/8/gcc/x86_64-apple-darwin16.7.0/8.2.0/ -I /usr/local/Cellar/gcc/8.2.0/lib/gcc/8/gcc/x86_64-apple-darwin16.7.0/8.2.0/include -I /usr/local/Cellar/gcc/8.2.0/lib/gcc/8/gcc/x86_64-apple-darwin16.7.0/8.2.0/finclude -fdebug-compilation-dir /Users/user/eclipse-workspace/Hello_OpenMP/Release -dwarf-debug-producer Apple LLVM version 9.0.0 (clang-900.0.39.2) -I /usr/local/Cellar/gcc/8.2.0/lib/gcc/8/gcc/x86_64-apple-darwin16.7.0/8.2.0/ -I /usr/local/Cellar/gcc/8.2.0/lib/gcc/8/gcc/x86_64-apple-darwin16.7.0/8.2.0/include -I /usr/local/Cellar/gcc/8.2.0/lib/gcc/8/gcc/x86_64-apple-darwin16.7.0/8.2.0/finclude -dwarf-version=4 -mrelocation-model pic -o src/hello_openmp.o /var/folders/65/7cxpqns144q6wx5lyb7zcyh80000gq/T//ccO12HNa.s
COMPILER_PATH=/usr/local/Cellar/gcc/8.2.0/libexec/gcc/x86_64-apple-darwin16.7.0/8.2.0/:/usr/local/Cellar/gcc/8.2.0/libexec/gcc/x86_64-apple-darwin16.7.0/8.2.0/:/usr/local/Cellar/gcc/8.2.0/libexec/gcc/x86_64-apple-darwin16.7.0/:/usr/local/Cellar/gcc/8.2.0/lib/gcc/8/gcc/x86_64-apple-darwin16.7.0/8.2.0/:/usr/local/Cellar/gcc/8.2.0/lib/gcc/8/gcc/x86_64-apple-darwin16.7.0/
LIBRARY_PATH=/usr/local/Cellar/gcc/8.2.0/lib/gcc/8/gcc/x86_64-apple-darwin16.7.0/8.2.0/:/usr/local/Cellar/gcc/8.2.0/lib/gcc/8/gcc/x86_64-apple-darwin16.7.0/8.2.0/../../../
COLLECT_GCC_OPTIONS='-funderscoring' '-I' '/usr/local/Cellar/gcc/8.2.0/lib/gcc/8/gcc/x86_64-apple-darwin16.7.0/8.2.0/' '-I' '/usr/local/Cellar/gcc/8.2.0/lib/gcc/8/gcc/x86_64-apple-darwin16.7.0/8.2.0/include' '-I' '/usr/local/Cellar/gcc/8.2.0/lib/gcc/8/gcc/x86_64-apple-darwin16.7.0/8.2.0/finclude' '-O3' '-Wall' '-c' '-fmessage-length=0' '-fopenmp' '-v' '-o' 'src/hello_openmp.o' '-mmacosx-version-min=10.12.0'  '-mtune=core2'
Finished building: ../src/hello_openmp.f90
 
Building target: Hello_OpenMP
Invoking: MacOS X Fortran Linker
/usr/local/bin/gfortran  -o "Hello_OpenMP"  ./src/hello_openmp.o  
Undefined symbols for architecture x86_64:
  "_GOMP_parallel", referenced from:
      _MAIN__ in hello_openmp.o
  "_omp_get_max_threads_", referenced from:
      _MAIN__ in hello_openmp.o
  "_omp_get_num_procs_", referenced from:
      _MAIN__ in hello_openmp.o
  "_omp_get_thread_num_", referenced from:
      _MAIN__._omp_fn.0 in hello_openmp.o
      _MAIN__ in hello_openmp.o
  "_omp_get_wtime_", referenced from:
      _MAIN__ in hello_openmp.o
ld: symbol(s) not found for architecture x86_64
collect2: error: ld returned 1 exit status
make: *** [Hello_OpenMP] Error 1

02:30:34 Build Failed. 2 errors, 0 warnings. (took 1s.615ms)

Any thoughts?

Sam Dupree.


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