merge

[ccan] / tools / depends.c

diff --git a/tools/depends.c b/tools/depends.c
index 1422c8585f51d8b220fc04ca9144dc91d9eaacae..e8cb53b8394c807aa9ddb6a7ba7a55777a06c38b 100644 (file)
--- a/tools/depends.c
+++ b/tools/depends.c
@@ -3,6 +3,7 @@
 #include "tools.h"
 #include <err.h>
 #include <stdbool.h>
+#include <unistd.h>
 
 static char ** __attribute__((format(printf, 3, 4)))
 lines_from_cmd(const void *ctx, unsigned int *num, char *format, ...)
@@ -27,11 +28,34 @@ lines_from_cmd(const void *ctx, unsigned int *num, char *format, ...)
        return strsplit(ctx, buffer, "\n", num);
 }
 
+static int unlink_info(char *infofile)
+{
+       unlink(infofile);
+       return 0;
+}
+
+/* Be careful about trying to compile over running programs (parallel make) */
+static char *compile_info(const void *ctx, const char *dir)
+{
+       char *infofile = talloc_asprintf(ctx, "%s/_info.%u", dir, getpid());
+       char *cmd = talloc_asprintf(ctx, "cc " CFLAGS " -o %s %s/_info.c",
+                                   infofile, dir);
+       talloc_set_destructor(infofile, unlink_info);
+       if (system(cmd) != 0)
+               return NULL;
+
+       return infofile;
+}
+
 static char **get_one_deps(const void *ctx, const char *dir, unsigned int *num)
 {
-       char **deps, *cmd;
+       char **deps, *cmd, *infofile;
+
+       infofile = compile_info(ctx, dir);
+       if (!infofile)
+               errx(1, "Could not compile _info for '%s'", dir);
 
-       cmd = talloc_asprintf(ctx, "%s/_info depends", dir);
+       cmd = talloc_asprintf(ctx, "%s depends", infofile);
        deps = lines_from_cmd(cmd, num, "%s", cmd);
        if (!deps)
                err(1, "Could not run '%s'", cmd);