diff --git a/Makefile b/Makefile
index 4592a40..259ed0e 100644
--- a/Makefile
+++ b/Makefile
@@ -37,7 +37,7 @@ test: test_format test_dirs test_files test_seek test_truncate test_parallel \
 	test_alloc test_paths test_orphan test_move test_corrupt
 test_%: tests/test_%.sh
 ifdef QUIET
-	./$< | sed -n '/^[-=]/p'
+	@./$< | sed -n '/^[-=]/p'
 else
 	./$<
 endif
diff --git a/emubd/lfs_emubd.c b/emubd/lfs_emubd.c
index fb518a8..b159596 100644
--- a/emubd/lfs_emubd.c
+++ b/emubd/lfs_emubd.c
@@ -190,7 +190,7 @@ int lfs_emubd_erase(const struct lfs_config *cfg, lfs_block_t block) {
     }
 
     if (!err && S_ISREG(st.st_mode) && (S_IWUSR & st.st_mode)) {
-        int err = unlink(emu->path);
+        err = unlink(emu->path);
         if (err) {
             return -errno;
         }
diff --git a/lfs.c b/lfs.c
index 4f75989..514a85b 100644
--- a/lfs.c
+++ b/lfs.c
@@ -481,7 +481,7 @@ static int lfs_dir_commit(lfs_t *lfs, lfs_dir_t *dir,
             while (newoff < (0x7fffffff & dir->d.size)-4) {
                 if (i < count && regions[i].oldoff == oldoff) {
                     lfs_crc(&crc, regions[i].newdata, regions[i].newlen);
-                    int err = lfs_bd_prog(lfs, dir->pair[0],
+                    err = lfs_bd_prog(lfs, dir->pair[0],
                             newoff, regions[i].newdata, regions[i].newlen);
                     if (err) {
                         if (err == LFS_ERR_CORRUPT) {
@@ -495,7 +495,7 @@ static int lfs_dir_commit(lfs_t *lfs, lfs_dir_t *dir,
                     i += 1;
                 } else {
                     uint8_t data;
-                    int err = lfs_bd_read(lfs, oldpair[1], oldoff, &data, 1);
+                    err = lfs_bd_read(lfs, oldpair[1], oldoff, &data, 1);
                     if (err) {
                         return err;
                     }
@@ -1005,7 +1005,7 @@ int lfs_dir_seek(lfs_t *lfs, lfs_dir_t *dir, lfs_off_t off) {
             return LFS_ERR_INVAL;
         }
 
-        int err = lfs_dir_fetch(lfs, dir, dir->d.tail);
+        err = lfs_dir_fetch(lfs, dir, dir->d.tail);
         if (err) {
             return err;
         }
@@ -1016,6 +1016,7 @@ int lfs_dir_seek(lfs_t *lfs, lfs_dir_t *dir, lfs_off_t off) {
 }
 
 lfs_soff_t lfs_dir_tell(lfs_t *lfs, lfs_dir_t *dir) {
+    (void)lfs;
     return dir->pos;
 }
 
@@ -1116,7 +1117,7 @@ static int lfs_ctz_extend(lfs_t *lfs,
             if (size != lfs->cfg->block_size) {
                 for (lfs_off_t i = 0; i < size; i++) {
                     uint8_t data;
-                    int err = lfs_cache_read(lfs, rcache, NULL,
+                    err = lfs_cache_read(lfs, rcache, NULL,
                             head, i, &data, 1);
                     if (err) {
                         return err;
@@ -1142,7 +1143,7 @@ static int lfs_ctz_extend(lfs_t *lfs,
             lfs_size_t skips = lfs_ctz(index) + 1;
 
             for (lfs_off_t i = 0; i < skips; i++) {
-                int err = lfs_cache_prog(lfs, pcache, rcache,
+                err = lfs_cache_prog(lfs, pcache, rcache,
                         nblock, 4*i, &head, 4);
                 if (err) {
                     if (err == LFS_ERR_CORRUPT) {
@@ -1450,7 +1451,7 @@ int lfs_file_sync(lfs_t *lfs, lfs_file_t *file) {
             !lfs_pairisnull(file->pair)) {
         // update dir entry
         lfs_dir_t cwd;
-        int err = lfs_dir_fetch(lfs, &cwd, file->pair);
+        err = lfs_dir_fetch(lfs, &cwd, file->pair);
         if (err) {
             return err;
         }
@@ -1669,7 +1670,8 @@ int lfs_file_truncate(lfs_t *lfs, lfs_file_t *file, lfs_off_t size) {
         return LFS_ERR_INVAL;
     }
 
-    if (size < lfs_file_size(lfs, file)) {
+    lfs_off_t oldsize = lfs_file_size(lfs, file);
+    if (size < oldsize) {
         // need to flush since directly changing metadata
         int err = lfs_file_flush(lfs, file);
         if (err) {
@@ -1686,11 +1688,11 @@ int lfs_file_truncate(lfs_t *lfs, lfs_file_t *file, lfs_off_t size) {
 
         file->size = size;
         file->flags |= LFS_F_DIRTY;
-    } else if (size > lfs_file_size(lfs, file)) {
+    } else if (size > oldsize) {
         lfs_off_t pos = file->pos;
 
         // flush+seek if not already at end
-        if (file->pos != lfs_file_size(lfs, file)) {
+        if (file->pos != oldsize) {
             int err = lfs_file_seek(lfs, file, 0, SEEK_END);
             if (err) {
                 return err;
@@ -1716,6 +1718,7 @@ int lfs_file_truncate(lfs_t *lfs, lfs_file_t *file, lfs_off_t size) {
 }
 
 lfs_soff_t lfs_file_tell(lfs_t *lfs, lfs_file_t *file) {
+    (void)lfs;
     return file->pos;
 }
 
@@ -1729,6 +1732,7 @@ int lfs_file_rewind(lfs_t *lfs, lfs_file_t *file) {
 }
 
 lfs_soff_t lfs_file_size(lfs_t *lfs, lfs_file_t *file) {
+    (void)lfs;
     if (file->flags & LFS_F_WRITING) {
         return lfs_max(file->pos, file->size);
     } else {
@@ -1737,7 +1741,7 @@ lfs_soff_t lfs_file_size(lfs_t *lfs, lfs_file_t *file) {
 }
 
 
-/// General fs oprations ///
+/// General fs operations ///
 int lfs_stat(lfs_t *lfs, const char *path, struct lfs_info *info) {
     // check for root, can only be something like '/././../.'
     if (strspn(path, "/.") == strlen(path)) {
@@ -1801,7 +1805,7 @@ int lfs_remove(lfs_t *lfs, const char *path) {
         // must be empty before removal, checking size
         // without masking top bit checks for any case where
         // dir is not empty
-        int err = lfs_dir_fetch(lfs, &dir, entry.d.u.dir);
+        err = lfs_dir_fetch(lfs, &dir, entry.d.u.dir);
         if (err) {
             return err;
         } else if (dir.d.size != sizeof(dir.d)+4) {
@@ -1826,7 +1830,7 @@ int lfs_remove(lfs_t *lfs, const char *path) {
         cwd.d.tail[0] = dir.d.tail[0];
         cwd.d.tail[1] = dir.d.tail[1];
 
-        int err = lfs_dir_commit(lfs, &cwd, NULL, 0);
+        err = lfs_dir_commit(lfs, &cwd, NULL, 0);
         if (err) {
             return err;
         }
@@ -1883,7 +1887,7 @@ int lfs_rename(lfs_t *lfs, const char *oldpath, const char *newpath) {
         // must be empty before removal, checking size
         // without masking top bit checks for any case where
         // dir is not empty
-        int err = lfs_dir_fetch(lfs, &dir, preventry.d.u.dir);
+        err = lfs_dir_fetch(lfs, &dir, preventry.d.u.dir);
         if (err) {
             return err;
         } else if (dir.d.size != sizeof(dir.d)+4) {
@@ -1910,12 +1914,12 @@ int lfs_rename(lfs_t *lfs, const char *oldpath, const char *newpath) {
     newentry.d.nlen = strlen(newpath);
 
     if (prevexists) {
-        int err = lfs_dir_update(lfs, &newcwd, &newentry, newpath);
+        err = lfs_dir_update(lfs, &newcwd, &newentry, newpath);
         if (err) {
             return err;
         }
     } else {
-        int err = lfs_dir_append(lfs, &newcwd, &newentry, newpath);
+        err = lfs_dir_append(lfs, &newcwd, &newentry, newpath);
         if (err) {
             return err;
         }
@@ -1943,7 +1947,7 @@ int lfs_rename(lfs_t *lfs, const char *oldpath, const char *newpath) {
         newcwd.d.tail[0] = dir.d.tail[0];
         newcwd.d.tail[1] = dir.d.tail[1];
 
-        int err = lfs_dir_commit(lfs, &newcwd, NULL, 0);
+        err = lfs_dir_commit(lfs, &newcwd, NULL, 0);
         if (err) {
             return err;
         }
@@ -2080,7 +2084,7 @@ int lfs_format(lfs_t *lfs, const struct lfs_config *cfg) {
     // write both pairs to be safe
     bool valid = false;
     for (int i = 0; i < 2; i++) {
-        int err = lfs_dir_commit(lfs, &superdir, (struct lfs_region[]){
+        err = lfs_dir_commit(lfs, &superdir, (struct lfs_region[]){
                 {sizeof(superdir.d), sizeof(superblock.d),
                  &superblock.d, sizeof(superblock.d)}
             }, 1);
@@ -2125,7 +2129,7 @@ int lfs_mount(lfs_t *lfs, const struct lfs_config *cfg) {
     }
 
     if (!err) {
-        int err = lfs_bd_read(lfs, dir.pair[0], sizeof(dir.d),
+        err = lfs_bd_read(lfs, dir.pair[0], sizeof(dir.d),
                 &superblock.d, sizeof(superblock.d));
         if (err) {
             return err;
@@ -2182,7 +2186,7 @@ int lfs_traverse(lfs_t *lfs, int (*cb)(void*, lfs_block_t), void *data) {
 
         // iterate over contents
         while (dir.off + sizeof(entry.d) <= (0x7fffffff & dir.d.size)-4) {
-            int err = lfs_bd_read(lfs, dir.pair[0], dir.off,
+            err = lfs_bd_read(lfs, dir.pair[0], dir.off,
                     &entry.d, sizeof(entry.d));
             if (err) {
                 return err;
@@ -2190,7 +2194,7 @@ int lfs_traverse(lfs_t *lfs, int (*cb)(void*, lfs_block_t), void *data) {
 
             dir.off += lfs_entry_size(&entry);
             if ((0x70 & entry.d.type) == (0x70 & LFS_TYPE_REG)) {
-                int err = lfs_ctz_traverse(lfs, &lfs->rcache, NULL,
+                err = lfs_ctz_traverse(lfs, &lfs->rcache, NULL,
                         entry.d.u.file.head, entry.d.u.file.size, cb, data);
                 if (err) {
                     return err;
@@ -2244,7 +2248,7 @@ static int lfs_pred(lfs_t *lfs, const lfs_block_t dir[2], lfs_dir_t *pdir) {
             return true;
         }
 
-        int err = lfs_dir_fetch(lfs, pdir, pdir->d.tail);
+        err = lfs_dir_fetch(lfs, pdir, pdir->d.tail);
         if (err) {
             return err;
         }
@@ -2270,7 +2274,7 @@ static int lfs_parent(lfs_t *lfs, const lfs_block_t dir[2],
         }
 
         while (true) {
-            int err = lfs_dir_next(lfs, parent, entry);
+            err = lfs_dir_next(lfs, parent, entry);
             if (err && err != LFS_ERR_NOENT) {
                 return err;
             }
@@ -2304,13 +2308,13 @@ static int lfs_moved(lfs_t *lfs, const void *e) {
     // iterate over all directory directory entries
     lfs_entry_t entry;
     while (!lfs_pairisnull(cwd.d.tail)) {
-        int err = lfs_dir_fetch(lfs, &cwd, cwd.d.tail);
+        err = lfs_dir_fetch(lfs, &cwd, cwd.d.tail);
         if (err) {
             return err;
         }
 
         while (true) {
-            int err = lfs_dir_next(lfs, &cwd, &entry);
+            err = lfs_dir_next(lfs, &cwd, &entry);
             if (err && err != LFS_ERR_NOENT) {
                 return err;
             }
@@ -2441,7 +2445,7 @@ int lfs_deorphan(lfs_t *lfs) {
         // check entries for moves
         lfs_entry_t entry;
         while (true) {
-            int err = lfs_dir_next(lfs, &cwd, &entry);
+            err = lfs_dir_next(lfs, &cwd, &entry);
             if (err && err != LFS_ERR_NOENT) {
                 return err;
             }
@@ -2460,7 +2464,7 @@ int lfs_deorphan(lfs_t *lfs) {
                 if (moved) {
                     LFS_DEBUG("Found move %d %d",
                             entry.d.u.dir[0], entry.d.u.dir[1]);
-                    int err = lfs_dir_remove(lfs, &cwd, &entry);
+                    err = lfs_dir_remove(lfs, &cwd, &entry);
                     if (err) {
                         return err;
                     }
@@ -2468,7 +2472,7 @@ int lfs_deorphan(lfs_t *lfs) {
                     LFS_DEBUG("Found partial move %d %d",
                             entry.d.u.dir[0], entry.d.u.dir[1]);
                     entry.d.type &= ~0x80;
-                    int err = lfs_dir_update(lfs, &cwd, &entry, NULL);
+                    err = lfs_dir_update(lfs, &cwd, &entry, NULL);
                     if (err) {
                         return err;
                     }
diff --git a/tests/template.fmt b/tests/template.fmt
index 4511e6d..a53f0c7 100644
--- a/tests/template.fmt
+++ b/tests/template.fmt
@@ -7,11 +7,11 @@
 
 
 // test stuff
-void test_log(const char *s, uintmax_t v) {{
+static void test_log(const char *s, uintmax_t v) {{
     printf("%s: %jd\n", s, v);
 }}
 
-void test_assert(const char *file, unsigned line,
+static void test_assert(const char *file, unsigned line,
         const char *s, uintmax_t v, uintmax_t e) {{
     static const char *last[6] = {{0, 0}};
     if (v != e || !(last[0] == s || last[1] == s ||
@@ -37,7 +37,8 @@ void test_assert(const char *file, unsigned line,
 
 
 // utility functions for traversals
-int test_count(void *p, lfs_block_t b) {{
+static int __attribute__((used)) test_count(void *p, lfs_block_t b) {{
+    (void)b;
     unsigned *u = (unsigned*)p;
     *u += 1;
     return 0;
@@ -96,7 +97,7 @@ const struct lfs_config cfg = {{
 
 
 // Entry point
-int main() {{
+int main(void) {{
     lfs_emubd_create(&cfg, "blocks");
 
 {tests}