X-Git-Url: https://git.ozlabs.org/?p=ccan;a=blobdiff_plain;f=tools%2Fccanlint%2Ftests%2Fexamples_compile.c;h=7d8803c6973db2cc4213915a30caa1e3aa67d5f3;hp=7e1f14f3088ab55ab605e1a1262d8d7d8f58875d;hb=932d65dd6537250e617516749f03a00fea3b34f6;hpb=f24a8d30f5b6b8c0e642a357e4dae6f9277d041f

diff --git a/tools/ccanlint/tests/examples_compile.c b/tools/ccanlint/tests/examples_compile.c
index 7e1f14f3..7d8803c6 100644
--- a/tools/ccanlint/tests/examples_compile.c
+++ b/tools/ccanlint/tests/examples_compile.c
@@ -1,6 +1,9 @@
 #include <tools/ccanlint/ccanlint.h>
 #include <tools/tools.h>
 #include <ccan/talloc/talloc.h>
+#include <ccan/str_talloc/str_talloc.h>
+#include <ccan/cast/cast.h>
+#include <ccan/str/str.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
@@ -8,129 +11,405 @@
 #include <string.h>
 #include <unistd.h>
 #include <ctype.h>
+#include <assert.h>
+#include <err.h>
+#include "build.h"
 
 static const char *can_run(struct manifest *m)
 {
 	if (safe_mode)
 		return "Safe mode enabled";
+	if (list_empty(&m->examples))
+		return "No examples to compile";
 	return NULL;
 }
 
-static char *obj_list(const struct manifest *m)
+static void add_mod(struct manifest ***deps, struct manifest *m)
 {
-	char *list;
-	struct ccan_file *i;
+	unsigned int num = talloc_get_size(*deps) / sizeof(*deps);
+	*deps = talloc_realloc(NULL, *deps, struct manifest *, num + 1);
+	(*deps)[num] = m;
+}
+
+static bool have_mod(struct manifest *deps[], const char *modname)
+{
+	unsigned int i;
+
+	for (i = 0; i < talloc_get_size(deps) / sizeof(*deps); i++)
+		if (strcmp(deps[i]->modname, modname) == 0)
+			return true;
+	return false;
+}
+
+static void add_dep(struct manifest ***deps, const char *modname)
+{
+	unsigned int i;
+	struct manifest *m;
+	char *errstr;
 
-	/* Object files for this module. */
-	list_for_each(&m->c_files, i, list)
-		list = talloc_asprintf_append(list, " %s", i->compiled);
+	if (have_mod(*deps, modname))
+		return;
 
-	/* Other ccan modules we depend on. */
-	list_for_each(&m->dep_dirs, i, list) {
-		if (i->compiled)
-			list = talloc_asprintf_append(list, " %s", i->compiled);
+	m = get_manifest(*deps, talloc_asprintf(*deps, "%s/ccan/%s",
+						ccan_dir, modname));
+	errstr = build_submodule(m, cflags, COMPILE_NORMAL);
+	if (errstr)
+		errx(1, "%s", errstr);
+
+	add_mod(deps, m);
+
+	/* Get that modules depends as well... */
+	assert(!safe_mode);
+	if (m->info_file) {
+		char **infodeps;
+
+		infodeps = get_deps(m, m->dir, "depends", false,
+				    get_or_compile_info);
+
+		for (i = 0; infodeps[i]; i++) {
+			if (strstarts(infodeps[i], "ccan/"))
+				add_dep(deps, infodeps[i] + strlen("ccan/"));
+		}
 	}
+}
 
-	return list;
+static struct manifest **get_example_deps(struct manifest *m,
+					  struct ccan_file *f)
+{
+	char **lines;
+	struct manifest **deps = talloc_array(f, struct manifest *, 0);
+
+	/* This one for a start. */
+	add_dep(&deps, m->modname);
+
+	/* Other modules implied by includes. */
+	for (lines = get_ccan_file_lines(f); *lines; lines++) {
+		char *modname;
+		if (strreg(f, *lines,
+			    "^[ \t]*#[ \t]*include[ \t]*[<\"]"
+			   "ccan/+(.+)/+[^/]+\\.h", &modname)) {
+			if (!have_mod(deps, modname))
+				add_dep(&deps, modname);
+		}
+	}
+
+	return deps;
 }
 
-static char *lib_list(const struct manifest *m)
+static char *example_obj_list(const void *ctx, struct manifest **deps)
 {
-	unsigned int i, num;
-	char **libs = get_libs(m, ".", &num, &m->info_file->compiled);
-	char *ret = talloc_strdup(m, "");
+	char *list = talloc_strdup(ctx, "");
+	unsigned int i;
 
-	for (i = 0; i < num; i++)
-		ret = talloc_asprintf_append(ret, "-l%s ", libs[i]);
-	return ret;
+	for (i = 0; i < talloc_array_length(deps); i++) {
+		if (deps[i]->compiled[COMPILE_NORMAL])
+			list = talloc_asprintf_append(list, " %s",
+						      deps[i]->compiled
+						      [COMPILE_NORMAL]);
+	}
+	return list;
 }
 
-static char *compile(const void *ctx,
-		     struct manifest *m,
-		     struct ccan_file *file,
-		     bool keep)
+static char *example_lib_list(const void *ctx, struct manifest **deps)
 {
-	char *errmsg;
+	char *list = talloc_strdup(ctx, "");
+	char **libs;
+	unsigned int i, j;
 
-	file->compiled = maybe_temp_file(ctx, "", keep, file->fullname);
-	errmsg = compile_and_link(ctx, file->fullname, ccan_dir,
-				  obj_list(m), "", lib_list(m), file->compiled);
-	if (errmsg) {
-		talloc_free(file->compiled);
-		return errmsg;
+	/* FIXME: This doesn't uniquify. */
+	for (i = 0; i < talloc_array_length(deps); i++) {
+		libs = get_libs(ctx, deps[i]->dir, NULL, get_or_compile_info);
+		for (j = 0; libs[j]; j++)
+			list = talloc_asprintf_append(list, "-l%s ", libs[j]);
 	}
-	return NULL;
+	return list;
 }
 
-struct score {
-	unsigned int score;
-	char *errors;
-};
+/* FIXME: Test with reduced features! */
+static bool compile(const void *ctx,
+		    struct manifest *m,
+		    struct ccan_file *file,
+		    char **output)
+{
+	struct manifest **deps = get_example_deps(m, file);
 
-static char *start_main(char *ret)
+	file->compiled[COMPILE_NORMAL] = temp_file(ctx, "", file->fullname);
+	if (!compile_and_link(ctx, file->fullname, ccan_dir,
+			      example_obj_list(file, deps),
+			      compiler, cflags,
+			      example_lib_list(file, deps),
+			      file->compiled[COMPILE_NORMAL],
+			      output)) {
+		/* Don't keep failures, even with --keep */
+		unlink(file->compiled[COMPILE_NORMAL]);
+		file->compiled[COMPILE_NORMAL] = NULL;
+		return false;
+	}
+	return true;
+}
+
+static char *start_main(char *ret, const char *why)
 {
 	return talloc_asprintf_append(ret,
-				      "/* Fake function wrapper inserted */\n"
-				      "int main(int argc, char *argv[])\n"
-				      "{\n");
+	      "/* The example %s, so fake function wrapper inserted */\n"
+	      "int main(int argc, char *argv[])\n"
+	      "{\n", why);
+}
+
+/* We only handle simple function definitions here. */
+static char *add_func(char *others, const char *line)
+{
+	const char *p, *end = strchr(line, '(') - 1;
+	while (cisspace(*end)) {
+		end--;
+		if (end == line)
+			return others;
+	}
+
+	for (p = end; cisalnum(*p) || *p == '_'; p--) {
+		if (p == line)
+			return others;
+	}
+
+	return talloc_asprintf_append(others, "printf(\"%%p\", %.*s);\n",
+				      (unsigned)(end - p), p+1);
 }
 
-static char *mangle(struct manifest *m, struct ccan_file *example)
+static void strip_leading_whitespace(char **lines)
+{
+	unsigned int i, min_span = -1U;
+
+	for (i = 0; lines[i]; i++) {
+		unsigned int span = strspn(lines[i], " \t");
+		/* All whitespace?  Ignore */
+		if (!lines[i][span])
+			continue;
+		if (span < min_span)
+			min_span = span;
+	}
+
+	for (i = 0; lines[i]; i++)
+		if (strlen(lines[i]) >= min_span)
+			lines[i] += min_span;
+}
+
+static bool looks_internal(char **lines, char **why)
 {
-	char **lines = get_ccan_file_lines(example);
-	char *ret;
-	bool in_function = false, fake_function = false;
 	unsigned int i;
+	bool last_ended = true; /* Did last line finish a statement? */
 
-	ret = talloc_strdup(m, "/* Prepend a heap of headers. */\n"
-			    "#include <assert.h>\n"
-			    "#include <err.h>\n"
-			    "#include <fcntl.h>\n"
-			    "#include <stdbool.h>\n"
-			    "#include <stdint.h>\n"
-			    "#include <stdio.h>\n"
-			    "#include <stdlib.h>\n"
-			    "#include <string.h>\n"
-			    "#include <sys/stat.h>\n"
-			    "#include <sys/types.h>\n"
-			    "#include <unistd.h>\n");
-	ret = talloc_asprintf_append(ret, "/* Include header from module. */\n"
-				     "#include <ccan/%s/%s.h>\n",
-				     m->basename, m->basename);
-
-	ret = talloc_asprintf_append(ret, "/* Useful dummmy functions. */\n"
-				     "int somefunc(void);\n"
-				     "int somefunc(void) { return 0; }\n");
-
-	/* Starts indented?  Wrap it in a main() function. */
-	if (lines[0] && isblank(lines[0][0])) {
-		ret = start_main(ret);
+	for (i = 0; lines[i]; i++) {
+		/* Skip leading whitespace. */
+		const char *line = lines[i] + strspn(lines[i], " \t");
+		unsigned len = strspn(line, IDENT_CHARS);
+
+		if (!line[0] || cisspace(line[0]) || strstarts(line, "//")
+		    || strstarts(line, "#line"))
+			continue;
+
+		assert(line[strlen(line)-1] != '\n');
+
+		/* The winners. */
+		if (strstarts(line, "if") && len == 2) {
+			*why = cast_const(char *, "starts with if");
+			return true;
+		}
+		if (strstarts(line, "for") && len == 3) {
+			*why = cast_const(char *, "starts with for");
+			return true;
+		}
+		if (strstarts(line, "while") && len == 5) {
+			*why = cast_const(char *, "starts with while");
+			return true;
+		}
+		if (strstarts(line, "do") && len == 2) {
+			*why = cast_const(char *, "starts with do");
+			return true;
+		}
+
+		/* The losers. */
+		if (strstarts(line, "#include")) {
+			*why = cast_const(char *, "starts with #include");
+			return false;
+		}
+
+		if (last_ended && strchr(line, '(')) {
+			if (strstarts(line, "static")) {
+				*why = cast_const(char *,
+						  "starts with static"
+						  " and contains (");
+				return false;
+			}
+			if (strends(line, ")")) {
+				*why = cast_const(char *,
+						  "contains ( and ends with )");
+				return false;
+			}
+		}
+
+		/* Previously prepended. */
+		if (strstr(line, "didn't seem to belong inside a function")) {
+			*why = cast_const(char *, "Comment said so");
+			return false;
+		}
+
+		/* Single identifier then operator == inside function. */
+		if (last_ended && len
+		    && cispunct(line[len+strspn(line+len, " ")])) {
+			*why = cast_const(char *, "starts with identifier"
+					  " then punctuation");
+			return true;
+		}
+
+		last_ended = (strends(line, "}")
+			      || strends(line, ";")
+			      || strends(line, "*/")
+			      || streq(line, "..."));
+	}
+
+	/* No idea... Say yes? */
+	*why = cast_const(char *, "gave no clues");
+	return true;
+}
+
+/* Examples will often build on prior ones.  Try combining them. */
+static char **combine(const void *ctx, char **lines, char **prev)
+{
+	unsigned int i, lines_total, prev_total, count;
+	char **ret;
+	const char *reasoning;
+	char *why = NULL;
+
+	if (!prev)
+		return NULL;
+
+	/* If it looks internal, put prev at start. */
+	if (looks_internal(lines, &why)) {
+		count = 0;
+		reasoning = "seemed to belong inside a function";
+	} else {
+		/* Try inserting in first elided position */
+		for (count = 0; lines[count]; count++) {
+			if (strcmp(lines[count], "...") == 0)
+				break;
+		}
+		if (!lines[count]) {
+			/* Try at start anyway? */
+			count = 0;
+			reasoning = "didn't seem to belong inside"
+				" a function, so we prepended the previous"
+				" example";
+		} else {
+			reasoning = "didn't seem to belong inside"
+				" a function, so we put the previous example"
+				" at the first ...";
+
+			count++;
+		}
+	}
+
+	for (i = 0; lines[i]; i++);
+	lines_total = i;
+
+	for (i = 0; prev[i]; i++);
+	prev_total = i;
+
+	ret = talloc_array(ctx, char *, 1 +lines_total + prev_total + 1);
+	ret[0] = talloc_asprintf(ret, "/* The example %s, thus %s */",
+				 why, reasoning);
+	memcpy(ret+1, lines, count * sizeof(ret[0]));
+	memcpy(ret+1 + count, prev, prev_total * sizeof(ret[0]));
+	memcpy(ret+1 + count + prev_total, lines + count,
+	       (lines_total - count + 1) * sizeof(ret[0]));
+	return ret;
+}
+
+/* Only handles very simple comments. */
+static char *strip_comment(const void *ctx, const char *orig_line)
+{
+	char *p, *ret = talloc_strdup(ctx, orig_line);
+
+	p = strstr(ret, "/*");
+	if (!p)
+		p = strstr(ret, "//");
+	if (p)
+		*p = '\0';
+	return ret;
+}
+
+static char *mangle(struct manifest *m, char **lines)
+{
+	char *ret, *use_funcs = NULL, *why;
+	bool in_function = false, fake_function = false, has_main = false;
+	unsigned int i;
+
+	ret = talloc_asprintf(m, 
+			      "/* Include header from module. */\n"
+			      "#include <ccan/%s/%s.h>\n"
+			      "/* Prepend a heap of headers. */\n"
+			      "#include <assert.h>\n"
+			      "#include <err.h>\n"
+			      "#include <errno.h>\n"
+			      "#include <fcntl.h>\n"
+			      "#include <limits.h>\n"
+			      "#include <stdbool.h>\n"
+			      "#include <stdint.h>\n"
+			      "#include <stdio.h>\n"
+			      "#include <stdlib.h>\n"
+			      "#include <string.h>\n"
+			      "#include <sys/stat.h>\n"
+			      "#include <sys/types.h>\n"
+			      "#include <unistd.h>\n",
+			      m->modname, m->basename);
+
+	ret = talloc_asprintf_append(ret, "/* Useful dummy functions. */\n"
+				     "extern int somefunc(void);\n"
+				     "int somefunc(void) { return 0; }\n"
+				     "extern char somestring[];\n"
+				     "char somestring[] = \"hello world\";\n");
+
+	if (looks_internal(lines, &why)) {
+		/* Wrap it all in main(). */
+		ret = start_main(ret, why);
 		fake_function = true;
 		in_function = true;
-	}
+		has_main = true;
+	} else
+		ret = talloc_asprintf_append(ret,
+			     "/* The example %s, so didn't wrap in main() */\n",
+				     why);
 
 	/* Primitive, very primitive. */
 	for (i = 0; lines[i]; i++) {
+		char *line = strip_comment(ret, lines[i]);
+
 		/* } at start of line ends a function. */
 		if (in_function) {
-			if (lines[i][0] == '}')
+			if (line[0] == '}')
 				in_function = false;
 		} else {
 			/* Character at start of line, with ( and no ;
-			 * == function start. */
-			if (!isblank(lines[i][0])
-			    && strchr(lines[i], '(')
-			    && !strchr(lines[i], ';'))
+			 * == function start.  Ignore comments. */
+			if (!cisspace(line[0])
+			    && strchr(line, '(')
+			    && !strchr(line, ';')
+			    && !strstr(line, "//")) {
 				in_function = true;
+				if (strncmp(line, "int main", 8) == 0)
+					has_main = true;
+				if (strncmp(line, "static", 6) == 0) {
+					use_funcs = add_func(use_funcs,
+							     line);
+				}
+			}
 		}
-		/* ... means elided code.  If followed by spaced line, means
-		 * next part is supposed to be inside a function. */
-		if (strcmp(lines[i], "...") == 0) {
-			if (!in_function
-			    && lines[i+1]
-			    && isblank(lines[i+1][0])) {
+		/* ... means elided code. */
+		if (strcmp(line, "...") == 0) {
+			if (!in_function && !has_main
+			    && looks_internal(lines + i + 1, &why)) {
 				/* This implies we start a function here. */
-				ret = start_main(ret);
+				ret = start_main(ret, why);
+				has_main = true;
 				fake_function = true;
 				in_function = true;
 			}
@@ -141,6 +420,27 @@ static char *mangle(struct manifest *m, struct ccan_file *example)
 		ret = talloc_asprintf_append(ret, "%s\n", lines[i]);
 	}
 
+	if (!has_main) {
+		ret = talloc_asprintf_append(ret,
+			     "/* Need a main to link successfully. */\n"
+			     "int main(void)\n{\n");
+		fake_function = true;
+	}
+
+	if (use_funcs) {
+		ret = talloc_asprintf_append(ret,
+					     "/* Get rid of unused warnings"
+					     " by printing addresses of"
+					     " static funcs. */\n");
+		if (!fake_function) {
+			ret = talloc_asprintf_append(ret,
+						     "int use_funcs(void);\n"
+						     "int use_funcs(void) {\n");
+			fake_function = true;
+		}
+		ret = talloc_asprintf_append(ret, "	%s\n", use_funcs);
+	}
+
 	if (fake_function)
 		ret = talloc_asprintf_append(ret, "return 0;\n"
 					     "}\n");
@@ -148,15 +448,16 @@ static char *mangle(struct manifest *m, struct ccan_file *example)
 }
 
 static struct ccan_file *mangle_example(struct manifest *m,
-					struct ccan_file *example, bool keep)
+					struct ccan_file *example,
+					char **lines)
 {
 	char *name, *contents;
 	int fd;
 	struct ccan_file *f;
 
-	name = maybe_temp_file(example, ".c", keep, 
-			       talloc_asprintf(m, "%s/mangled-%s",
-					       m->dir, example->name));
+	name = temp_file(example, ".c",
+			 talloc_asprintf(m, "%s/mangled-%s",
+					 m->dir, example->name));
 	f = new_ccan_file(example,
 			  talloc_dirname(example, name),
 			  talloc_basename(example, name));
@@ -166,75 +467,189 @@ static struct ccan_file *mangle_example(struct manifest *m,
 	if (fd < 0)
 		return NULL;
 
-	contents = mangle(m, example);
+	contents = mangle(m, lines);
 	if (write(fd, contents, strlen(contents)) != strlen(contents)) {
 		close(fd);
 		return NULL;
 	}
 	close(fd);
+	f->contents = talloc_steal(f, contents);
+	list_add(&m->mangled_examples, &f->list);
 	return f;
 }
 
-static void *build_examples(struct manifest *m, bool keep,
-			    unsigned int *timeleft)
+/* If an example has expected output, it's complete and should not be
+ * included in future examples. */
+static bool has_expected_output(char **lines)
+{
+	unsigned int i;
+
+	for (i = 0; lines[i]; i++) {
+		char *p = lines[i] + strspn(lines[i], " \t");
+		if (!strstarts(p, "//"))
+			continue;
+		p += strspn(p, "/ ");
+		if (strncasecmp(p, "given", strlen("given")) == 0)
+			return true;
+	}
+	return false;
+}
+
+static unsigned int try_compiling(struct manifest *m,
+				  struct ccan_file *i,
+				  char **prev,
+				  struct ccan_file *mangled[3],
+				  bool res[3],
+				  char *err[3],
+				  char **lines[3])
+{
+	unsigned int num;
+
+	/* Try standalone. */
+	mangled[0] = i;
+	res[0] = compile(i, m, mangled[0], &err[0]);
+	lines[0] = get_ccan_file_lines(i);
+	if (res[0] && streq(err[0], ""))
+		return 1;
+
+	if (prev) {
+		lines[1] = combine(i, get_ccan_file_lines(i), prev);
+
+		mangled[1] = mangle_example(m, i, lines[1]);
+		res[1] = compile(i, m, mangled[1], &err[1]);
+		if (res[1] && streq(err[1], "")) {
+			return 2;
+		}
+		num = 2;
+	} else
+		num = 1;
+
+	/* Try standalone. */
+	lines[num] = get_ccan_file_lines(i);
+	mangled[num] = mangle_example(m, i, lines[num]);
+	res[num] = compile(i, m, mangled[num], &err[num]);
+
+	return num+1;
+}
+
+static void build_examples(struct manifest *m,
+			   unsigned int *timeleft, struct score *score)
 {
 	struct ccan_file *i;
-	struct score *score = talloc(m, struct score);
+	char **prev = NULL;
+	bool warnings = false;
 
-	score->score = 0;
-	score->errors = NULL;
+	score->total = 0;
+	score->pass = true;
 
 	list_for_each(&m->examples, i, list) {
-		char *ret;
+		char *err[3];
+		struct ccan_file *file[3] = { NULL, NULL, NULL };
+		bool res[3];
+		unsigned num, j;
+		char **lines[3];
+		const char *error;
 
-		examples_compile.total_score++;
-		ret = compile(score, m, i, keep);
-		if (!ret)
-			score->score++;
-		else {
-			struct ccan_file *mangle = mangle_example(m, i, keep);
+		score->total++;
+
+		/* Simplify our dumb parsing. */
+		strip_leading_whitespace(get_ccan_file_lines(i));
+
+		num = try_compiling(m, i, prev, file, res, err, lines);
 
-			talloc_free(ret);
-			ret = compile(score, m, mangle, keep);
-			if (!ret)
+		/* First look for a compile without any warnings. */
+		for (j = 0; j < num; j++) {
+			if (res[j] && streq(err[j], "")) {
+				if (!has_expected_output(lines[j]))
+					prev = lines[j];
 				score->score++;
-			else {
-				if (!score->errors)
-					score->errors = ret;
-				else {
-					score->errors
-					= talloc_append_string(score->errors,
-							       ret);
-					talloc_free(ret);
-				}
+				goto next;
 			}
 		}
-	}
-	return score;
-}
 
-static unsigned int score_examples(struct manifest *m, void *check_result)
-{
-	struct score *score = check_result;
-	return score->score;
-}
+		/* Now accept anything which succeeded. */
+		for (j = 0; j < num; j++) {
+			if (res[j]) {
+				if (!has_expected_output(lines[j]))
+					prev = lines[j];
+				score->score++;
+				warnings = true;
+				score_file_error(score, file[j], 0,
+						 "Compiling extracted example"
+						 " gave warnings:\n"
+						 "Example:\n"
+						 "%s\n"
+						 "Compiler:\n"
+						 "%s",
+						 get_ccan_file_contents(file[j]),
+						 err[j]);
+				goto next;
+			}
+		}
 
-static const char *describe(struct manifest *m, void *check_result)
-{
-	struct score *score = check_result;
-	if (verbose >= 2 && score->errors)
-		return talloc_asprintf(m, "Compile errors building examples:\n"
-				       "%s", score->errors);
-	return NULL;
+		score->pass = false;
+		if (!verbose) {
+			if (num == 3)
+				error = "Compiling standalone, adding headers, "
+					"and including previous "
+					"example all failed";
+			else
+				error = "Standalone compile and"
+					" adding headers both failed";
+		} else {
+			if (num == 3) {
+				error = talloc_asprintf(score,
+				      "Standalone example:\n"
+				      "%s\n"
+				      "Errors: %s\n\n"
+				      "Combining with previous example:\n"
+				      "%s\n"
+				      "Errors: %s\n\n"
+				      "Adding headers, wrappers:\n"
+				      "%s\n"
+				      "Errors: %s\n\n",
+				      get_ccan_file_contents(file[0]),
+				      err[0],
+				      get_ccan_file_contents(file[1]),
+				      err[1],
+				      get_ccan_file_contents(file[2]),
+				      err[2]);
+			} else {
+				error = talloc_asprintf(score,
+				      "Standalone example:\n"
+				      "%s\n"
+				      "Errors: %s\n\n"
+				      "Adding headers, wrappers:\n"
+				      "%s\n"
+				      "Errors: %s\n\n",
+				      get_ccan_file_contents(file[0]),
+				      err[0],
+				      get_ccan_file_contents(file[1]),
+				      err[1]);
+			}
+		}
+		score_file_error(score, i, 0, "%s", error);
+		/* This didn't work, so not a candidate for combining. */
+		prev = NULL;
+
+	next:
+		;
+	}
+
+	/* An extra point if they all compiled without warnings. */
+	if (!list_empty(&m->examples)) {
+		score->total++;
+		if (!warnings)
+			score->score++;
+	}
 }
 
 struct ccanlint examples_compile = {
-	.key = "examples-compile",
+	.key = "examples_compile",
 	.name = "Module examples compile",
-	.score = score_examples,
 	.check = build_examples,
-	.describe = describe,
 	.can_run = can_run,
+	.needs = "examples_exist module_builds"
 };
 
-REGISTER_TEST(examples_compile, &has_examples, NULL);
+REGISTER_TEST(examples_compile);