ccanlint: read config.h to get compilation flags at runtime.

[ccan] / tools / ccanlint / ccanlint.c

diff --git a/tools/ccanlint/ccanlint.c b/tools/ccanlint/ccanlint.c
index 1c7ee389dbc75728d35091e23a7d0c5a4463a469..231ae7c05c45e0b1050b834b096b48ddb634f23d 100644 (file)
--- a/tools/ccanlint/ccanlint.c
+++ b/tools/ccanlint/ccanlint.c
@@ -31,6 +31,7 @@
 #include <ccan/talloc/talloc.h>
 #include <ccan/opt/opt.h>
 #include <ccan/foreach/foreach.h>
+#include <ccan/grab_file/grab_file.h>
 
 int verbose = 0;
 static LIST_HEAD(compulsory_tests);
@@ -41,6 +42,12 @@ static struct btree *cmdline_exclude;
 static struct btree *info_exclude;
 static unsigned int timeout;
 
+/* These are overridden at runtime if we can find config.h */
+const char *compiler = CCAN_COMPILER;
+const char *cflags = CCAN_CFLAGS;
+
+const char *config_header;
+
 #if 0
 static void indent_print(const char *string)
 {
@@ -475,6 +482,92 @@ static void skip_unrelated_tests(struct ccanlint *target)
                                i->skip = "not relevant to target";
 }
 
+static char *demangle_string(char *string)
+{
+       unsigned int i;
+       const char mapfrom[] = "abfnrtv";
+       const char mapto[] = "\a\b\f\n\r\t\v";
+
+       if (!strchr(string, '"'))
+               return NULL;
+       string = strchr(string, '"') + 1;
+       if (!strrchr(string, '"'))
+               return NULL;
+       *strrchr(string, '"') = '\0';
+
+       for (i = 0; i < strlen(string); i++) {
+               if (string[i] == '\\') {
+                       char repl;
+                       unsigned len = 0;
+                       char *p = strchr(mapfrom, string[i+1]);
+                       if (p) {
+                               repl = mapto[p - mapfrom];
+                               len = 1;
+                       } else if (strlen(string+i+1) >= 3) {
+                               if (string[i+1] == 'x') {
+                                       repl = (string[i+2]-'0')*16
+                                               + string[i+3]-'0';
+                                       len = 3;
+                               } else if (isdigit(string[i+1])) {
+                                       repl = (string[i+2]-'0')*8*8
+                                               + (string[i+3]-'0')*8
+                                               + (string[i+4]-'0');
+                                       len = 3;
+                               }
+                       }
+                       if (len == 0) {
+                               repl = string[i+1];
+                               len = 1;
+                       }
+
+                       string[i] = repl;
+                       memmove(string + i + 1, string + i + len + 1,
+                               strlen(string + i + len + 1) + 1);
+               }
+       }
+
+       return string;
+}
+
+
+static void read_config_header(void)
+{
+       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 = demangle_string(lines[i]);
+                       if (verbose > 1)
+                               printf("%s: compiler set to '%s'\n",
+                                      fname, compiler);
+               } else if (streq(sym, "CCAN_CFLAGS")) {
+                       cflags = demangle_string(lines[i]);
+                       if (verbose > 1)
+                               printf("%s: compiler flags set to '%s'\n",
+                                      fname, cflags);
+               }
+       }
+       if (!compiler || !cflags)
+               errx(1, "Problem parsing %s", fname);
+}
+
 int main(int argc, char *argv[])
 {
        bool summary = false;
@@ -535,6 +628,7 @@ int main(int argc, char *argv[])
                tools_verbose = true;
 
        m = get_manifest(talloc_autofree_context(), dir);
+       read_config_header();
 
        /* Create a symlink from temp dir back to src dir's test directory. */
        if (symlink(talloc_asprintf(m, "%s/test", dir),