vg does not compile on Arch Linux

[subwaystation]

1. What were you trying to do?
Compile vg on Arch Linux.

git clone --recursive https://github.com/vgteam/vg.git
cd vg
. ./source_me.sh && make

2. What did you want to happen?
It did not compile.

3. What actually happened?
Make crashed.

4. If you got a line like Stack trace path: /somewhere/on/your/computer/stacktrace.txt, please copy-paste the contents of that file here:

. ./source_me.sh && /usr/bin/g++ -I/home/heumos/git/vg/include -I. -I/home/heumos/git/vg/src -I/home/heumos/git/vg/src/unittest -I/home/heumos/git/vg/src/subcommand -I/home/heumos/git/vg/include/dynamic -I/home/heumos/git/vg/include/sonLib -I/usr/include/cairo -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/lib/libffi-3.2.1/include -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/harfbuzz  -O3 -Werror=return-type -std=c++14 -ggdb -g -MMD -MP -I /home/heumos/git/vg/include -I/home/heumos/git/vg/include/dynamic -I /home/heumos/git/vg/include -I/home/heumos/git/vg/include/dynamic  -fopenmp -msse4.2 -c -o obj/main.o src/main.cpp 
. ./source_me.sh && /usr/bin/g++ -I/home/heumos/git/vg/include -I. -I/home/heumos/git/vg/src -I/home/heumos/git/vg/src/unittest -I/home/heumos/git/vg/src/subcommand -I/home/heumos/git/vg/include/dynamic -I/home/heumos/git/vg/include/sonLib -I/usr/include/cairo -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/lib/libffi-3.2.1/include -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/harfbuzz  -O3 -Werror=return-type -std=c++14 -ggdb -g -MMD -MP -I /home/heumos/git/vg/include -I/home/heumos/git/vg/include/dynamic -I /home/heumos/git/vg/include -I/home/heumos/git/vg/include/dynamic  -fopenmp -msse4.2 -c -o obj/haplotype_extracter.o src/haplotype_extracter.cpp 
. ./source_me.sh && /usr/bin/g++ -I/home/heumos/git/vg/include -I. -I/home/heumos/git/vg/src -I/home/heumos/git/vg/src/unittest -I/home/heumos/git/vg/src/subcommand -I/home/heumos/git/vg/include/dynamic -I/home/heumos/git/vg/include/sonLib -I/usr/include/cairo -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/lib/libffi-3.2.1/include -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/harfbuzz  -O3 -Werror=return-type -std=c++14 -ggdb -g -MMD -MP -I /home/heumos/git/vg/include -I/home/heumos/git/vg/include/dynamic -I /home/heumos/git/vg/include -I/home/heumos/git/vg/include/dynamic  -fopenmp -msse4.2 -c -o obj/multipath_mapper.o src/multipath_mapper.cpp 
. ./source_me.sh && /usr/bin/g++ -I/home/heumos/git/vg/include -I. -I/home/heumos/git/vg/src -I/home/heumos/git/vg/src/unittest -I/home/heumos/git/vg/src/subcommand -I/home/heumos/git/vg/include/dynamic -I/home/heumos/git/vg/include/sonLib -I/usr/include/cairo -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/lib/libffi-3.2.1/include -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/harfbuzz  -O3 -Werror=return-type -std=c++14 -ggdb -g -MMD -MP -I /home/heumos/git/vg/include -I/home/heumos/git/vg/include/dynamic -I /home/heumos/git/vg/include -I/home/heumos/git/vg/include/dynamic  -fopenmp -msse4.2 -c -o obj/alignment_emitter.o src/alignment_emitter.cpp 
. ./source_me.sh && /usr/bin/g++ -I/home/heumos/git/vg/include -I. -I/home/heumos/git/vg/src -I/home/heumos/git/vg/src/unittest -I/home/heumos/git/vg/src/subcommand -I/home/heumos/git/vg/include/dynamic -I/home/heumos/git/vg/include/sonLib -I/usr/include/cairo -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/lib/libffi-3.2.1/include -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/harfbuzz  -O3 -Werror=return-type -std=c++14 -ggdb -g -MMD -MP -I /home/heumos/git/vg/include -I/home/heumos/git/vg/include/dynamic -I /home/heumos/git/vg/include -I/home/heumos/git/vg/include/dynamic  -fopenmp -msse4.2 -c -o obj/chunker.o src/chunker.cpp 
. ./source_me.sh && /usr/bin/g++ -I/home/heumos/git/vg/include -I. -I/home/heumos/git/vg/src -I/home/heumos/git/vg/src/unittest -I/home/heumos/git/vg/src/subcommand -I/home/heumos/git/vg/include/dynamic -I/home/heumos/git/vg/include/sonLib -I/usr/include/cairo -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/lib/libffi-3.2.1/include -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/harfbuzz  -O3 -Werror=return-type -std=c++14 -ggdb -g -MMD -MP -I /home/heumos/git/vg/include -I/home/heumos/git/vg/include/dynamic -I /home/heumos/git/vg/include -I/home/heumos/git/vg/include/dynamic  -fopenmp -msse4.2 -c -o obj/stream_sorter.o src/stream_sorter.cpp 
. ./source_me.sh && /usr/bin/g++ -I/home/heumos/git/vg/include -I. -I/home/heumos/git/vg/src -I/home/heumos/git/vg/src/unittest -I/home/heumos/git/vg/src/subcommand -I/home/heumos/git/vg/include/dynamic -I/home/heumos/git/vg/include/sonLib -I/usr/include/cairo -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/lib/libffi-3.2.1/include -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/harfbuzz  -O3 -Werror=return-type -std=c++14 -ggdb -g -MMD -MP -I /home/heumos/git/vg/include -I/home/heumos/git/vg/include/dynamic -I /home/heumos/git/vg/include -I/home/heumos/git/vg/include/dynamic  -fopenmp -msse4.2 -c -o obj/variant_recall.o src/variant_recall.cpp 
In file included from src/vg.hpp:29,
                 from src/variant_recall.hpp:16,
                 from src/variant_recall.cpp:2:
/home/heumos/git/vg/include/vg/io/stream.hpp: In function ‘void vg::io::for_each_parallel_impl(std::istream&, const std::function<void(T&, T&)>&, const std::function<void(T&)>&, const std::function<bool()>&, size_t) [with T = vg::Alignment]’:
/home/heumos/git/vg/include/vg/io/stream.hpp:185:34: error: ‘batch_size’ not specified in enclosing ‘parallel’
  185 |             if (batch->size() == batch_size) {
      |                                  ^~~~~~~~~~
/home/heumos/git/vg/include/vg/io/stream.hpp:153:13: error: enclosing ‘parallel’
  153 |     #pragma omp parallel default(none) shared(in, lambda1, lambda2, batches_outstanding, max_batches_outstanding, single_threaded_until_true, cerr)
      |             ^~~
/home/heumos/git/vg/include/vg/io/stream.hpp:242:47: error: ‘batch_size’ not specified in enclosing ‘task’
  242 |                             for (int i = 0; i<batch_size; i+=2) {
      |                                               ^~~~~~~~~~
/home/heumos/git/vg/include/vg/io/stream.hpp:234:9: error: enclosing ‘task’
  234 | #pragma omp task default(none) firstprivate(batch) shared(batches_outstanding, lambda2, handle, single_threaded_until_true, cerr)
      |         ^~~
make: *** [Makefile:693: obj/variant_recall.o] Error 1

5. What data and command can the vg dev team use to make the problem happen?
See above.

6. What does running vg version say?

Current master clone from github.

Could someone please help me out here?

[subwaystation]

[heumos@wave vg]$ gcc --version
gcc (GCC) 9.2.0

[glennhickey]

Hmm, I guess this is my fault. On my machine (and the CI systems), "batch_size" get read even with #pragma omp parallel default(none) because it is const, which OMP implictly shares. I guess newer compilers (I'm using 7.4) don't take kindly to this.

[subwaystation]

Thanks man, that solved it :)