[Bug math/19211] New: lgamma functions do not set signgam for -ffinite-math-only for C99-based standards

["jsm28 at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=19211

            Bug ID: 19211
           Summary: lgamma functions do not set signgam for
                    -ffinite-math-only for C99-based standards
           Product: glibc
           Version: 2.22
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
          Assignee: unassigned at sourceware dot org
          Reporter: jsm28 at gcc dot gnu.org
  Target Milestone: ---

The lgamma inline functions in bits/math-finite.h do not set signgam if
__USE_ISOC99, even when other feature test macros mean a standard such as XSI
POSIX is selected for which it should be set.  (This is essentially the
opposite issue to bug 15421, the out-of-line versions setting signgam even when
they shouldn't.)

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