+ char *fname = talloc_asprintf(NULL, "%s/config.h", ccan_dir);
+ char **lines;
+ unsigned int i;
+
+ config_header = grab_file(NULL, fname, NULL);
+ if (!config_header) {
+ talloc_free(fname);
+ return;
+ }
+
+ lines = strsplit(config_header, config_header, "\n");
+ for (i = 0; i < talloc_array_length(lines) - 1; i++) {
+ char *sym;
+ const char **line = (const char **)&lines[i];
+
+ if (!get_token(line, "#"))
+ continue;
+ if (!get_token(line, "define"))
+ continue;
+ sym = get_symbol_token(lines, line);
+ if (streq(sym, "CCAN_COMPILER") && !compiler) {
+ compiler = demangle_string(lines[i]);
+ if (!compiler)
+ errx(1, "%s:%u:could not parse CCAN_COMPILER",
+ fname, i+1);
+ if (verbose > 1)
+ printf("%s: compiler set to '%s'\n",
+ fname, compiler);
+ } else if (streq(sym, "CCAN_CFLAGS") && !cflags) {
+ cflags = demangle_string(lines[i]);
+ if (!cflags)
+ errx(1, "%s:%u:could not parse CCAN_CFLAGS",
+ fname, i+1);
+ if (verbose > 1)
+ printf("%s: compiler flags set to '%s'\n",
+ fname, cflags);
+ }
+ }
+ if (!compiler)
+ compiler = CCAN_COMPILER;
+ if (!cflags)
+ compiler = CCAN_CFLAGS;
+}
+
+static char *opt_set_const_charp(const char *arg, const char **p)
+{
+ return opt_set_charp(arg, cast_const2(char **, p));
+}