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v/examples/call_v_from_c/README.md

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## A simple example to show how to call a function written in v from c
### Compile as a shared library
#### On Linux:
Step 1: Compile the v code to a shared library using `v -cc gcc -shared v_test_print.v` or
`v -cc gcc -shared v_test_math.v`.
Step 2: Compile the c file using `gcc test_print.c v_test_print.so -o test_print` or
`gcc test_math.c v_test_math.so -o test_math`.
Step 3: Run the compiled c file using `LD_LIBRARY_PATH=. ./test_print` or
`LD_LIBRARY_PATH=. ./test_math`.
#### On Mac OSX:
On Mac OSX, libgc can be obtained from homebrew by `brew install libgc`.
During compiling and/or linking, `-I/usr/local/include -L/usr/local/lib` (for x86_64),
or `-I/opt/homebrew/include -L/opt/homebrew/lib` (for arm64) can be added depending the arch.
Step 1: Compile the v code to a shared library using `v -cc gcc -shared v_test_print.v` or
`v -cc gcc -shared v_test_math.v`.
Step 2: Compile the c file using `gcc test_print.c v_test_print.dylib -o test_print` or
`gcc test_math.c v_test_math.dylib -o test_math`.
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Step 3: Run the compiled c file using `LD_LIBRARY_PATH=. ./test_print` or
`LD_LIBRARY_PATH=. ./test_math`.
#### On Windows:
Step 1: Compile the v code to a shared library using `v -cc gcc -shared v_test_print.v` or
`v -cc gcc -shared v_test_math.v`.
Step 2: Compile the c file using `gcc test_print.c v_test_print.dll -o test_print.exe` or
`gcc test_math.c v_test_math.dll -o test_math.exe`.
Step 3: Run the compiled c file using `test_print.exe` or `test_math.exe`.
### Compile as a c file
***Requirements: `libgc` must be installed***
Step 1: Compile the v code to a shared library using
`v -shared -cc gcc -o v_test_print.c v_test_print.v` or
`v -shared -cc gcc -o v_test_math.c v_test_math.v`.
*Specifying the output with a `.c` extension will generate the corresponding C source file.*
Step 2: Compile the c file using `gcc test_print.c v_test_print.c -o test_print -lgc` or
`gcc test_math.c v_test_math.c -o test_math -lgc -lm`.
Step 3: Run the compiled c file using `./test_print` or `./test_math`.