Bitcoin Forum

hello friends,i install
sudo make install in ubuntu 20 . 
it show error as follow
```
 make: *** [Makefile:2018: cxx_db.o] Error 1
```
how can i fix that

1. Please post the full error message including source code if it is given.
2. Please tell us what program you are compiling (Bitcoin Core?)

i solved this error by enter dbinc and atomic.h and edit atomic_compare_exchange to atomic_compare_exchange_db in atomic.h . 
Now I compile bitcoin core by following commands
```
cd bitcoin

./autogen.sh

sudo chmod -R 775 /root/bitcoin/

./autogen.sh

./configure CPPFLAGS="-I${BDB_PREFIX}/include/ -O2" LDFLAGS="-L${BDB_PREFIX}/lib/"

make


```
when command make , it show error again . this is
```
g++: fatal error: Killed signal terminated program cc1plus
compilation terminated.
make[2]: *** [Makefile:9605: libbitcoin_node_a-init.o] Error 1
make[2]: Leaving directory '/root/bitcoin/src'
make[1]: *** [Makefile:18946: all-recursive] Error 1
make[1]: Leaving directory '/root/bitcoin/src'
make: *** [Makefile:821: all-recursive] Error 1


```

why this happen ?

You seem to be running out of memory during compilation. How much RAM do you have, and how are you calling make (e.g. make -j4)? A single thread requires about 2GB of memory for compiling Bitcoin Core.

If you are just using make with one thread (no -j argument), you can try adding temporary swap space (https://stackoverflow.com/questions/30887143/make-j-8-g-internal-compiler-error-killed-program-cc1plus), but I don't recommend this.

RAM 1GB cannot handle bitcoin core. Right ? just simply call by ``` make ``` . if increase RAM GB , it will be ok . right?

Um... No. Don't modify the Bitcoin source code to fix compiling errors.. :D
It compiles just fine providing your setup (dependencies, hardware, ...) is good. Working around such issues by modifying the source is not the way to go.

First of all, I wouldn't recommend running Bitcoin Core as root user, nor installing it as user root.

Why don't you use the default build commands from the documentation?
https://github.com/bitcoin/bitcoin/blob/master/doc/build-unix.md

This is again not the complete error message, though, right.

It is recommended to have 1.5GB at the very least, but you can tune compiler flags.