generate code coverage reports

test/build.bx

 includes := snow ../include/lang2
 defines := SNOW_ENABLED
 sanitizers := address undefined
-cflags := -g
+cflags := -g -fprofile-arcs -ftest-coverage
+ldflags := --coverage
+ldlibs := gcov

test/examples/arrays.l2

 
 arr.1 = "nope"
 print arr
+
+print []

test/examples/arrays.l2.expected

 [10 20 30]
 30
 [10 nope 30]
+[]

test/examples/functions.l2

 	{retval}
 }
 print func()()
+
+print {0}

test/examples/functions.l2.expected

 Hello World
 10
 what's up
+(function)

test/examples/namespaces.l2

 
 obj.bar = {baz: "how's your day going?"}
 print obj.bar.baz
+
+print {}

test/examples/namespaces.l2.expected

 hello world
 100
 how's your day going?
+(namespace)

test/generate-coverage.sh

+#!/bin/sh
+set -ex
+
+box --run -q
+mkdir -p coverage
+gcov $(find bx-out -type f -name '*.o')
+mv *.gcov coverage
+cp $(find bx-out -type f -name '*.gcda' -or -name '*.gcno') coverage
+
+cd coverage
+lcov --capture --directory . --output-file coverage.info
+genhtml coverage.info --output-directory report

test/src/examples.t.c

 	vm.std_output = &output.w;
 
 	l2_vm_run(&vm);
+	l2_vm_gc(&vm);
 
 	l2_vm_free(&vm);
 	free(bytecode.mem);