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authorRob Landley <rob@landley.net>2005-08-23 20:03:17 +0000
committerRob Landley <rob@landley.net>2005-08-23 20:03:17 +0000
commitf4c684a1efcf8a602d0803c889aba610b9a5ddb8 (patch)
tree86f0ce2508401a710ac9fd0a3c4bf17b2cfa1210
parent6417564eebe6b9591d9c001160d201194bd5e24a (diff)
downloadbusybox-f4c684a1efcf8a602d0803c889aba610b9a5ddb8.tar.gz
When compiling with FEATURE_MTAB_SUPPORT disabled, the call to erase_mtab()
can never be made because useMtab is initialized to 0, and all the other assignments of that variable assign 0 to it. Any compiler that can perform simple constant propogation on local variables will optimize away if statements testing against that variable, thus the call to erase_mtab() will never be made. When compiling for arm using gcc 3.3.3 with FEATURE_MTAB_SUPPORT disabled, the linker complains that it can't find erase_mtab(). The arm optimizer isn't exactly the brightest member of the family, and apparently needs to be hit over the head with a hammer to get its' attention...
-rw-r--r--util-linux/umount.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/util-linux/umount.c b/util-linux/umount.c
index 6de71b4ab..dd072e7f6 100644
--- a/util-linux/umount.c
+++ b/util-linux/umount.c
@@ -116,7 +116,9 @@ extern int umount_main(int argc, char **argv)
del_loop(m->device);
if(curstat) {
- if(useMtab && m) erase_mtab(m->dir);
+ /* Yes, the ENABLE is redundant here, but the optimizer for ARM
+ * can't do simple constant propogation in local variables... */
+ if(ENABLE_FEATURE_MTAB_SUPPORT && useMtab && m) erase_mtab(m->dir);
status = EXIT_FAILURE;
bb_perror_msg("Couldn't umount %s\n", path);
}