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When compiling with FEATURE_MTAB_SUPPORT disabled, the call to erase_mtab()

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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...
This commit is contained in:
Rob Landley 2005-08-23 20:03:17 +00:00
parent 6417564eeb
commit f4c684a1ef
1 changed files with 3 additions and 1 deletions
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4
util-linux/umount.c
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@ -116,7 +116,9 @@ extern int umount_main(int argc, char **argv)
del_loop(m->device); del_loop(m->device);
if(curstat) { 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; status = EXIT_FAILURE;
bb_perror_msg("Couldn't umount %s\n", path); bb_perror_msg("Couldn't umount %s\n", path);
} }