v/examples/call_v_from_c

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 -Wl,-rpath=. or gcc test_math.c v_test_math.so -o test_math -Wl,-rpath=..

Step 3: Run the compiled c file using ./test_print or ./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.

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.