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Build user-space with different gcc optimization levels

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This fix resolves warnings reported during compiling of user-space
libraries with different gcc optimization levels.

Tested with gcc versions: 4.9.2 (Debian), and 6.1.1 (Fedora).
The patch enables use of following opt levels: O0, O1, O2, O3, Og, Os, Ofast.

List of warnings:

[GCC 4.9.2 -Os]
libzfs_sendrecv.c:3726:26: error: 'clp' may be used uninitialized in this function [-Werror=maybe-uninitialized]

[GCC 4.9.2 -Og]
fs_fletcher.c:323:26: error: 'idx' may be used uninitialized in this function [-Werror=maybe-uninitialized]
dsl_dataset.c:1290:12: error: 'atp' may be used uninitialized in this function [-Werror=maybe-uninitialized]

[GCC 4.9.2 -Ofast]
u8_textprep.c:1310:9: error: 'tc[3ul]' may be used uninitialized in this function [-Werror=maybe-uninitialized]
u8_textprep.c:177:23: error: 'u8t[0ul]' may be used uninitialized in this function [-Werror=maybe-uninitialized]
dsl_dataset.c:2089:37: error: ‘hds’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
dsl_dataset.c:3216:2: error: ‘ds’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
dsl_dataset.c:1591:2: error: ‘ds’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
dsl_dataset.c:3341:2: error: ‘ds’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
vdev_raidz.c:1153:8: error: 'dcount[2]' may be used uninitialized in this function [-Werror=maybe-uninitialized]
vdev_raidz.c:1167:17: error: 'dst[2]' may be used uninitialized in this function [-Werror=maybe-uninitialized]
kernel.c:1005:2: error: ‘resid’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
libzfs_dataset.c:2826:8: error: ‘val’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
libzfs_dataset.c:3056:35: error: ‘val’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
libzfs_dataset.c:1584:13: error: ‘val’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
libzfs_dataset.c:3056:35: error: ‘val’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
libzfs_dataset.c:1792:66: error: ‘val’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
libzfs_dataset.c:3986:35: error: ‘val’ may be used uninitialized in this function [-Werror=maybe-uninitialized]

[GCC 6.1.1]
Resolved in PR #4907

Signed-off-by: Gvozden Neskovic <neskovic@gmail.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #4937
This commit is contained in:
Gvozden Neskovic
2016-07-26 21:08:51 +02:00
committed by Brian Behlendorf
parent afb6c031e8
commit 689f093ebc
7 changed files with 14 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files
module/unicode/u8_textprep.c
+2 -2
View File
@@ -1060,7 +1060,7 @@ do_composition(size_t uv, uchar_t *s, uchar_t *comb_class, uchar_t *start,
uchar_t *disp, size_t last, uchar_t **os, uchar_t *oslast)
{
uchar_t t[U8_STREAM_SAFE_TEXT_MAX + 1];
uchar_t tc[U8_MB_CUR_MAX];
uchar_t tc[U8_MB_CUR_MAX] = { '\0' };
uint8_t saved_marks[U8_MAX_CHARS_A_SEQ];
size_t saved_marks_count;
uchar_t *p;
@@ -1396,7 +1396,7 @@ collect_a_seq(size_t uv, uchar_t *u8s, uchar_t **source, uchar_t *slast,
uchar_t comb_class[U8_MAX_CHARS_A_SEQ];
uchar_t disp[U8_MAX_CHARS_A_SEQ];
uchar_t start[U8_MAX_CHARS_A_SEQ];
uchar_t u8t[U8_MB_CUR_MAX];
uchar_t u8t[U8_MB_CUR_MAX] = { '\0' };
uchar_t uts[U8_STREAM_SAFE_TEXT_MAX + 1];
uchar_t tc;
size_t last;