crystal_dependencies_for_termux

# See also: https://forum.crystal-lang.org/t/running-crystal-on-termux/3880

# Termux
pkg install -y \
  automake \
  build-essential \
  clang \
  git \
  libbsd* \
  libedit* \
  libevent* \
  libgc* \
  libgmp* \
  libpcre* \
  libssh* \
  libtool* \
  libxml2* \
  libyaml* \
  libllvm* \
  lld* \
  # libgmpxx4ldbl \

# ln -sf /usr/bin/ld.lld-8 /usr/bin/ld.lld

# zip up `crystal` folder and copy to device
# cd ~/storage/shared/Android/data/com.termux/files
# tar xvzf file.tar.gz
# aka: data/data/com.termux/files/home/storage/shared/Android/data/com.termux/files

# copy crystal
cp crystal.tar.gz ~/
PATH=/data/data/com.termux/files/usr/bin:$PATH

cd ~/
tar xvzf crystal.tar.gz
cd crystal

# LLVM_CONFIG=$(which llvm-config) make deps

make deps

cc crystal.o -o .build/crystal -rdynamic src/llvm/ext/llvm_ext.o `llvm-config --libs --system-libs --ldflags 2> /dev/null` -lstdc++ -lpcre -lm -lgc -lpthread -levent -lrt -ldl

Gets stuck at:

~/crystal $ cc crystal.o -o .build/crystal -rdynamic src/llvm/ext/llvm_ext.o `llvm-config --libs --system-libs --ldflags 2> /dev/null` -lstdc++ -lpcre -lm -lgc -lpthread -levent -lrt -ldl
/data/data/com.termux/files/usr/bin/ld: src/llvm/ext/llvm_ext.o: Relocations in generic ELF (EM: 62)
/data/data/com.termux/files/usr/bin/ld: src/llvm/ext/llvm_ext.o: Relocations in generic ELF (EM: 62)
...
/data/data/com.termux/files/usr/bin/ld: src/llvm/ext/llvm_ext.o: Relocations in generic ELF (EM: 62)                                /data/data/com.termux/files/usr/bin/ld: src/llvm/ext/llvm_ext.o: error adding symbols: file in wrong format                         clang-12: error: linker command failed with exit code 1 (use -v to see invocation)
~/crystal $

Note: After copying files to device , on the device you must remove llvm_ext.o from device and re-run make deps and then run cc crystal ...:

$ find -name llvm_ext.o
./src/llvm/ext/llvm_ext.o

$ rm ./src/llvm/ext/llvm_ext.o

make deps

cc crystal.o -o .build/crystal -rdynamic src/llvm/ext/llvm_ext.o `llvm-config --libs --system-libs --ldflags 2> /dev/null` -lstdc++ -lpcre -lm -lgc -lpthread -levent -lrt -ldl

~/crystal $ bin/crystal -v
bin/crystal: 153: crystal: not found
Using compiled compiler at .build/crystal
Crystal 1.2.0-dev ()

LLVM: 12.0.0
Default target: aarch64-unknown-linux-android24

~/crystal $ bin/crystal eval "puts(1+2)"
bin/crystal: 153: crystal: not found
Using compiled compiler at .build/crystal
3

~/crystal $ bin/crystal eval "puts Time.utc""
> "
bin/crystal: 153: crystal: not found
Using compiled compiler at .build/crystal
2021-09-25 15:33:44 UTC

Now to rebuild Crystal on device and run specs:

# backup
mv bin/crystal bin/crystal.OLD

# rebuild
make clean crystal