[Bug build/19444] New: build failures with -O1 due to -Wmaybe-uninitialized

["msebor at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=19444

            Bug ID: 19444
           Summary: build failures with -O1 due to -Wmaybe-uninitialized
           Product: glibc
           Version: 2.23
            Status: NEW
          Severity: normal
          Priority: P2
         Component: build
          Assignee: unassigned at sourceware dot org
          Reporter: msebor at redhat dot com
                CC: carlos at redhat dot com
  Target Milestone: ---

Glibc fails to build with -O1 due to a number of errors similar to the
following two:

../sysdeps/ieee754/dbl-64/e_jn.c: In function â__ieee754_jnâ:
../sysdeps/ieee754/dbl-64/e_jn.c:110:20: error: âtempâ may be used
uninitialized in this function [-Werror=maybe-uninitialized]
      b = invsqrtpi * temp / __ieee754_sqrt (x);
                    ^
../sysdeps/ieee754/dbl-64/e_jn.c: In function â__ieee754_ynâ:
../sysdeps/ieee754/dbl-64/e_jn.c:317:16: error: âtempâ may be used
uninitialized in this function [-Werror=maybe-uninitialized]
  b = invsqrtpi * temp / __ieee754_sqrt (x);
                ^

The following is a more comprehensive (though not necessarily complete) list of
such errors on x86_64 obtained by building the library with make -k:

../sysdeps/ieee754/dbl-64/e_jn.c:110:20: error: âtempâ may be used
uninitialized in this function [-Werror=maybe-uninitialized]
../sysdeps/ieee754/dbl-64/e_jn.c:317:16: error: âtempâ may be used
uninitialized in this function [-Werror=maybe-uninitialized]
../sysdeps/ieee754/dbl-64/s_sin.c:565:3: error: âretvalâ may be used
uninitialized in this function [-Werror=maybe-uninitialized]
../sysdeps/ieee754/dbl-64/s_sin.c:672:3: error: âretvalâ may be used
uninitialized in this function [-Werror=maybe-uninitialized]
../sysdeps/ieee754/dbl-64/s_sincos.c:94:13: error: âretvalâ may be used
uninitialized in this function [-Werror=maybe-uninitialized]
../sysdeps/ieee754/dbl-64/s_sincos.c:93:13: error: âretvalâ may be used
uninitialized in this function [-Werror=maybe-uninitialized]
../sysdeps/ieee754/dbl-64/s_sincos.c:84:13: error: âretvalâ may be used
uninitialized in this function [-Werror=maybe-uninitialized]
../sysdeps/ieee754/dbl-64/s_sincos.c:83:13: error: âretvalâ may be used
uninitialized in this function [-Werror=maybe-uninitialized]
../sysdeps/ieee754/ldbl-96/e_jnl.c:145:20: error: âtempâ may be used
uninitialized in this function [-Werror=maybe-uninitialized]
../sysdeps/ieee754/ldbl-96/e_jnl.c:374:16: error: âtempâ may be used
uninitialized in this function [-Werror=maybe-uninitialized]
../sysdeps/ieee754/dbl-64/s_sin.c:565:3: error: âretvalâ may be used
uninitialized in this function [-Werror=maybe-uninitialized]
../sysdeps/ieee754/dbl-64/s_sin.c:672:3: error: âretvalâ may be used
uninitialized in this function [-Werror=maybe-uninitialized]
../sysdeps/ieee754/dbl-64/s_sin.c:565:3: error: âretvalâ may be used
uninitialized in this function [-Werror=maybe-uninitialized]
../sysdeps/ieee754/dbl-64/s_sin.c:672:3: error: âretvalâ may be used
uninitialized in this function [-Werror=maybe-uninitialized]
../sysdeps/ieee754/dbl-64/e_jn.c:110:20: error: âtempâ may be used
uninitialized in this function [-Werror=maybe-uninitialized]
../sysdeps/ieee754/dbl-64/e_jn.c:317:16: error: âtempâ may be used
uninitialized in this function [-Werror=maybe-uninitialized]
../sysdeps/ieee754/dbl-64/s_sin.c:565:3: error: âretvalâ may be used
uninitialized in this function [-Werror=maybe-uninitialized]
../sysdeps/ieee754/dbl-64/s_sin.c:672:3: error: âretvalâ may be used
uninitialized in this function [-Werror=maybe-uninitialized]
../sysdeps/ieee754/dbl-64/s_sincos.c:94:13: error: âretvalâ may be used
uninitialized in this function [-Werror=maybe-uninitialized]
../sysdeps/ieee754/dbl-64/s_sincos.c:93:13: error: âretvalâ may be used
uninitialized in this function [-Werror=maybe-uninitialized]
../sysdeps/ieee754/dbl-64/s_sincos.c:84:13: error: âretvalâ may be used
uninitialized in this function [-Werror=maybe-uninitialized]
../sysdeps/ieee754/dbl-64/s_sincos.c:83:13: error: âretvalâ may be used
uninitialized in this function [-Werror=maybe-uninitialized]
../sysdeps/ieee754/ldbl-96/e_jnl.c:145:20: error: âtempâ may be used
uninitialized in this function [-Werror=maybe-uninitialized]
../sysdeps/ieee754/ldbl-96/e_jnl.c:374:16: error: âtempâ may be used
uninitialized in this function [-Werror=maybe-uninitialized]
../sysdeps/ieee754/dbl-64/s_sin.c:565:3: error: âretvalâ may be used
uninitialized in this function [-Werror=maybe-uninitialized]
../sysdeps/ieee754/dbl-64/s_sin.c:672:3: error: âretvalâ may be used
uninitialized in this function [-Werror=maybe-uninitialized]
../sysdeps/ieee754/dbl-64/s_sin.c:565:3: error: âretvalâ may be used
uninitialized in this function [-Werror=maybe-uninitialized]
../sysdeps/ieee754/dbl-64/s_sin.c:672:3: error: âretvalâ may be used
uninitialized in this function [-Werror=maybe-uninitialized]

-- 
You are receiving this mail because:
You are on the CC list for the bug.