Silence false -Werror=maybe-uninitialized

...in code recently added with 7e23cbdbb6ec0247a29ed8a8f744c01e10963ea0
"tdf#149551 separate TextRotateAngle from TextPreRotateAngle", hitting at least
with gcc-c++-12.1.1-1.fc36.x86_64,

> In file included from include/tools/degree.hxx:15,
>                  from include/vcl/bitmap.hxx:23,
>                  from include/vcl/alpha.hxx:28,
>                  from include/vcl/bitmapex.hxx:24,
>                  from include/vcl/graph.hxx:26,
>                  from include/oox/export/drawingml.hxx:47,
>                  from oox/source/export/drawingml.cxx:26:
> In function ‘o3tl::strong_int<UT, PT> o3tl::operator+(const strong_int<UT, PT>&, const strong_int<UT, PT>&) [with UT = int; PT = FractionTag<100>]’,
>     inlined from ‘void oox::drawingml::DrawingML::WriteText(const com::sun::star::uno::Reference<com::sun::star::uno::XInterface>&, bool, bool, sal_Int32, bool)’ at oox/source/export/drawingml.cxx:3520:33:
> include/o3tl/strong_int.hxx:143:12: error: ‘*(const o3tl::strong_int<int, FractionTag<100> >*)((char*)&nTextRotateAngleDeg100 + offsetof(std::optional<o3tl::strong_int<int, FractionTag<100> > >,std::optional<o3tl::strong_int<int, FractionTag<100> > >::<unnamed>.std::_Optional_base<o3tl::strong_int<int, FractionTag<100> >, true, true>::<unnamed>)).o3tl::strong_int<int, FractionTag<100> >::m_value’ may be used uninitialized [-Werror=maybe-uninitialized]
>   143 |     return strong_int<UT,PT>(lhs.get() + rhs.get());
>       |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> oox/source/export/drawingml.cxx: In member function ‘void oox::drawingml::DrawingML::WriteText(const com::sun::star::uno::Reference<com::sun::star::uno::XInterface>&, bool, bool, sal_Int32, bool)’:
> oox/source/export/drawingml.cxx:3346:30: note: ‘*(const o3tl::strong_int<int, FractionTag<100> >*)((char*)&nTextRotateAngleDeg100 + offsetof(std::optional<o3tl::strong_int<int, FractionTag<100> > >,std::optional<o3tl::strong_int<int, FractionTag<100> > >::<unnamed>.std::_Optional_base<o3tl::strong_int<int, FractionTag<100> >, true, true>::<unnamed>)).o3tl::strong_int<int, FractionTag<100> >::m_value’ was declared here
>  3346 |     std::optional<Degree100> nTextRotateAngleDeg100; // text area rotation
>       |                              ^~~~~~~~~~~~~~~~~~~~~~

and then

> In file included from include/oox/export/drawingml.hxx:38,
>                  from oox/source/export/drawingml.cxx:26:
> In function ‘rtl::OString oox::drawingml::calcRotationValue(sal_Int32)’,
>     inlined from ‘void oox::drawingml::DrawingML::WriteText(const com::sun::star::uno::Reference<com::sun::star::uno::XInterface>&, bool, bool, sal_Int32, bool)’ at oox/source/export/drawingml.cxx:3551:48:
> include/oox/drawingml/drawingmltypes.hxx:168:19: error: ‘*(const o3tl::strong_int<int, FractionTag<100> >*)((char*)&nTextRotateAngleDeg100 + offsetof(std::optional<o3tl::strong_int<int, FractionTag<100> > >,std::optional<o3tl::strong_int<int, FractionTag<100> > >::<unnamed>.std::_Optional_base<o3tl::strong_int<int, FractionTag<100> >, true, true>::<unnamed>)).o3tl::strong_int<int, FractionTag<100> >::m_value’ may be used uninitialized [-Werror=maybe-uninitialized]
>   168 |         nRotation -= 36000;
>       |         ~~~~~~~~~~^~~~~~~~
> oox/source/export/drawingml.cxx: In member function ‘void oox::drawingml::DrawingML::WriteText(const com::sun::star::uno::Reference<com::sun::star::uno::XInterface>&, bool, bool, sal_Int32, bool)’:
> oox/source/export/drawingml.cxx:3346:30: note: ‘*(const o3tl::strong_int<int, FractionTag<100> >*)((char*)&nTextRotateAngleDeg100 + offsetof(std::optional<o3tl::strong_int<int, FractionTag<100> > >,std::optional<o3tl::strong_int<int, FractionTag<100> > >::<unnamed>.std::_Optional_base<o3tl::strong_int<int, FractionTag<100> >, true, true>::<unnamed>)).o3tl::strong_int<int, FractionTag<100> >::m_value’ was declared here
>  3346 |     std::optional<Degree100> nTextRotateAngleDeg100; // text area rotation
>       |                              ^~~~~~~~~~~~~~~~~~~~~~

Change-Id: Id0bf911ada8f8d7343e9c51107776e303ed72a25
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/137779
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/oox/source/export/drawingml.cxx b/oox/source/export/drawingml.cxx
index 63a5d22dd222..0f3008bc3482 100644
--- a/oox/source/export/drawingml.cxx
+++ b/oox/source/export/drawingml.cxx
@@ -3516,8 +3516,15 @@ void DrawingML::WriteText(const Reference<XInterface>& rXIface, bool bBodyPr, bo
         }
         else if (nTextPreRotateAngle == -180 || nTextPreRotateAngle == 180)
         {
+#if defined __GNUC__ && !defined __clang__ && __GNUC__ == 12
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#endif
             nTextRotateAngleDeg100
                 = NormAngle18000(nTextRotateAngleDeg100.value_or(0_deg100) + 18000_deg100);
+#if defined __GNUC__ && !defined __clang__ && __GNUC__ == 12
+#pragma GCC diagnostic pop
+#endif
             // ToDo: Examine insets. They might need rotation too.
         }
         else
@@ -3540,8 +3547,15 @@ void DrawingML::WriteText(const Reference<XInterface>& rXIface, bool bBodyPr, bo
 
     std::optional<OString> sTextRotateAngleMSUnit;
     if (nTextRotateAngleDeg100.has_value())
+#if defined __GNUC__ && !defined __clang__ && __GNUC__ == 12
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#endif
         sTextRotateAngleMSUnit
             = oox::drawingml::calcRotationValue(nTextRotateAngleDeg100.value().get());
+#if defined __GNUC__ && !defined __clang__ && __GNUC__ == 12
+#pragma GCC diagnostic pop
+#endif
 
     TextHorizontalAdjust eHorizontalAlignment( TextHorizontalAdjust_CENTER );
     bool bHorizontalCenter = false;