Question

I tried to compile Shallot on Ubuntu linux (gcc ./src/shallot.c), but I’ve got this error:

/tmp/ccwsRxaV.o: In function `main':
shallot.c:(.text+0x3d): undefined reference to `usage'
shallot.c:(.text+0x1ea): undefined reference to `parse_cpuinfo'
shallot.c:(.text+0x2a3): undefined reference to `pattern'
shallot.c:(.text+0x2eb): undefined reference to `usage'
shallot.c:(.text+0x3ba): undefined reference to `usage'
shallot.c:(.text+0x440): undefined reference to `usage'
shallot.c:(.text+0x4de): undefined reference to `usage'
shallot.c:(.text+0x57a): undefined reference to `usage'
/tmp/ccwsRxaV.o:shallot.c:(.text+0x5f4): more undefined references to `usage' follow
/tmp/ccwsRxaV.o: In function `main':
shallot.c:(.text+0x92d): undefined reference to `worker'
shallot.c:(.text+0x941): undefined reference to `pthread_create'
shallot.c:(.text+0x984): undefined reference to `monitor_proc'
shallot.c:(.text+0x998): undefined reference to `pthread_create'
shallot.c:(.text+0x9b7): undefined reference to `worker'
shallot.c:(.text+0x9db): undefined reference to `pthread_join'

Sorry, but I’m not a programmer. I don’t really know how this should work.

Answer 1

Well I went to the site, took down the instructions and gave it a try. Seems pretty straight forward:

First clone the source into a “shallot” directory:

git clone https://github.com/katmagic/Shallot.git Shallot

Then we run the configure:

mike@linux-4puc:~/C/Shallot> ./configure
Liunx detected. Have you
considered switching to BSD?
Configuration successful. This does not
mean it will build.
If you are missing gcc, or required
libraries/headers, you will need to install them first.

Finally run the Makefile:

mike@linux-4puc:~/C/Shallot> make
cc  -O3 -I/usr/include -I/usr/local/include -L/usr/lib -L/usr/local/lib  -Wall -o src/math.o -c src/math.c
cc  -O3 -I/usr/include -I/usr/local/include -L/usr/lib -L/usr/local/lib  -Wall -o src/error.o -c src/error.c
cc  -O3 -I/usr/include -I/usr/local/include -L/usr/lib -L/usr/local/lib  -Wall -o src/linux.o -c src/linux.c
cc  -O3 -I/usr/include -I/usr/local/include -L/usr/lib -L/usr/local/lib  -Wall -o src/print.o -c src/print.c
cc  -O3 -I/usr/include -I/usr/local/include -L/usr/lib -L/usr/local/lib  -Wall -o src/thread.o -c src/thread.c
cc  -O3 -I/usr/include -I/usr/local/include -L/usr/lib -L/usr/local/lib  -Wall -o src/shallot.o -c src/shallot.c
cc  -O3 -I/usr/include -I/usr/local/include -L/usr/lib -L/usr/local/lib -pthread src/math.o src/error.o src/linux.o src/print.o src/thread.o src/shallot.o -o shallot -lm -lpthread -lssl -lcrypto

And now the executable shallot can be seen in the directory:

mike@linux-4puc:~/C/Shallot> ls
CHANGELOG  configure  LICENSE  Makefile  README.asciidoc  shallot  src

So if you followed all the steps exactly like I did, I suspect the place you’re having issues is the block of text I highlighted above. Do you have all the required libraries/headers for building shallot?