X-Git-Url: https://git.ozlabs.org/?p=ccan;a=blobdiff_plain;f=tools%2Fdepends.c;h=e8cb53b8394c807aa9ddb6a7ba7a55777a06c38b;hp=1422c8585f51d8b220fc04ca9144dc91d9eaacae;hb=a13257dd9b06ccd236092ccb7df8e1239ba79fa6;hpb=f6387bc4a0f5aa75160095a876b103758ea807c7

diff --git a/tools/depends.c b/tools/depends.c
index 1422c858..e8cb53b8 100644
--- 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);