freebsd: backtrace

vlib/builtin/builtin.v

@@ -99,6 +99,12 @@ pub fn eprintln(s string) {
 		C.fflush(stderr)
 		return
 	}
+	$if freebsd {
+		C.fprintf(stderr, '%.*s\n', s.len, s.str)
+		C.fflush(stderr)
+		return
+	}
+
 	// TODO issues with stderr and cross compiling for Linux
 	println(s)
 }
@@ -171,4 +177,3 @@ pub fn is_atty(fd int) int {
 		return C.isatty(fd)
 	}
 }
-

vlib/builtin/builtin_nix.v

@@ -18,6 +18,7 @@ fn print_backtrace_skipping_top_frames_nix(xskipframes int) bool {
 	skipframes := xskipframes + 2
 	$if mac { return print_backtrace_skipping_top_frames_mac(skipframes) }
 	$if linux { return print_backtrace_skipping_top_frames_linux(skipframes) }
+	$if freebsd { return print_backtrace_skipping_top_frames_freebsd(skipframes)  }
 	return false
 }
 
@@ -32,6 +33,15 @@ fn print_backtrace_skipping_top_frames_mac(skipframes int) bool {
 	return true
 }
 
+fn print_backtrace_skipping_top_frames_freebsd(skipframes int) bool {
+	$if freebsd {
+        buffer := [100]byteptr
+        nr_ptrs := C.backtrace(*voidptr(buffer), 100)
+        C.backtrace_symbols_fd(*voidptr(&buffer[skipframes]), nr_ptrs-skipframes, 1)
+        }
+        return true
+}
+
 fn print_backtrace_skipping_top_frames_linux(skipframes int) bool {
 	$if tinyc {
 		println('TODO: print_backtrace_skipping_top_frames_linux $skipframes with tcc fails tests with "stack smashing detected" .')

vlib/compiler/cgen.v

@@ -309,6 +309,7 @@ fn platform_postfix_to_ifdefguard(name string) string {
 		'_nix.v'               { '#ifndef _WIN32' }
 		'_lin.v', '_linux.v'   { '#ifdef __linux__' }
 		'_mac.v', '_darwin.v'  { '#ifdef __APPLE__' }
+		'_bsd.v', '_freebsd.v '{ '#ifdef __FreeBSD__'}
 		'_solaris.v'           { '#ifdef __sun' }
 		'_haiku.v'             { '#ifdef __haiku__' }
 		else {