Compilation error in FillRectilinear.cpp if debug is disabled

[Tapchicoma]

Describe the bug

I am trying to create Gentoo ebuild for SuperSlicer 2.3.56.7 release and see following compilation error:

[112/329] /usr/lib/distcc/bin/x86_64-pc-linux-gnu-g++ -DBOOST_ALL_NO_LIB -DBOOST_ATOMIC_DYN_LINK -DBOOST_CHRONO_DYN_LINK -DBOOST_DATE_TIME_DYN_LINK -DBOOST_FILESYSTEM_DYN_LINK -DBOOST_IOSTREAMS_DYN_LINK -DBOOST_LOCALE_DYN_LINK -DBOOST_LOG_DYN_LINK -DBOOST_REGEX_DYN_LINK -DBOOST_SYSTEM_DYN_LINK -DBOOST_THREAD_DYN_LINK -DLIBNEST2D_GEOMETRIES_clipper -DLIBNEST2D_OPTIMIZER_nlopt -DLIBNEST2D_STATIC -DSLIC3R_GUI -DTBB_USE_CAPTURED_EXCEPTION=0 -DUNICODE -DUSE_TBB -DWXINTL_NO_GETTEXT_MACRO -D_UNICODE -DwxNO_UNSAFE_WXSTRING_CONV -DwxUSE_UNICODE -I/usr/include/dbus-1.0 -I/usr/lib64/dbus-1.0/include -I/var/tmp/portage/media-gfx/superslicer-2.3.56.7/work/SuperSlicer-2.3.56.7/src -Isrc/platform -I/var/tmp/portage/media-gfx/superslicer-2.3.56.7/work/SuperSlicer-2.3.56.7/src/clipper -I/var/tmp/portage/media-gfx/superslicer-2.3.56.7/work/SuperSlicer-2.3.56.7/src/polypartition -I/var/tmp/portage/media-gfx/superslicer-2.3.56.7/work/SuperSlicer-2.3.56.7/src/libslic3r -Isrc/libslic3r -I/var/tmp/portage/media-gfx/superslicer-2.3.56.7/work/SuperSlicer-2.3.56.7/src/libnest2d/include -I/var/tmp/portage/media-gfx/superslicer-2.3.56.7/work/SuperSlicer-2.3.56.7/src/glu-libtess/include -isystem /usr/include/eigen3 -isystem /usr/include/miniz -isystem /usr/include/OpenEXR  -DNDEBUG -march=skylake -O2 -pipe -fomit-frame-pointer -ftree-vectorize -fext-numeric-literals -Wall -Wno-reorder -fPIC -Werror=return-type -Wno-ignored-attributes -Wno-unknown-pragmas -pthread -DOPENVDB_ABI_VERSION_NUMBER=7 -std=gnu++17 -MD -MT src/libslic3r/CMakeFiles/libslic3r.dir/Fill/FillRectilinear.cpp.o -MF src/libslic3r/CMakeFiles/libslic3r.dir/Fill/FillRectilinear.cpp.o.d -o src/libslic3r/CMakeFiles/libslic3r.dir/Fill/FillRectilinear.cpp.o -c /var/tmp/portage/media-gfx/superslicer-2.3.56.7/work/SuperSlicer-2.3.56.7/src/libslic3r/Fill/FillRectilinear.cpp
FAILED: src/libslic3r/CMakeFiles/libslic3r.dir/Fill/FillRectilinear.cpp.o 
/usr/lib/distcc/bin/x86_64-pc-linux-gnu-g++ -DBOOST_ALL_NO_LIB -DBOOST_ATOMIC_DYN_LINK -DBOOST_CHRONO_DYN_LINK -DBOOST_DATE_TIME_DYN_LINK -DBOOST_FILESYSTEM_DYN_LINK -DBOOST_IOSTREAMS_DYN_LINK -DBOOST_LOCALE_DYN_LINK -DBOOST_LOG_DYN_LINK -DBOOST_REGEX_DYN_LINK -DBOOST_SYSTEM_DYN_LINK -DBOOST_THREAD_DYN_LINK -DLIBNEST2D_GEOMETRIES_clipper -DLIBNEST2D_OPTIMIZER_nlopt -DLIBNEST2D_STATIC -DSLIC3R_GUI -DTBB_USE_CAPTURED_EXCEPTION=0 -DUNICODE -DUSE_TBB -DWXINTL_NO_GETTEXT_MACRO -D_UNICODE -DwxNO_UNSAFE_WXSTRING_CONV -DwxUSE_UNICODE -I/usr/include/dbus-1.0 -I/usr/lib64/dbus-1.0/include -I/var/tmp/portage/media-gfx/superslicer-2.3.56.7/work/SuperSlicer-2.3.56.7/src -Isrc/platform -I/var/tmp/portage/media-gfx/superslicer-2.3.56.7/work/SuperSlicer-2.3.56.7/src/clipper -I/var/tmp/portage/media-gfx/superslicer-2.3.56.7/work/SuperSlicer-2.3.56.7/src/polypartition -I/var/tmp/portage/media-gfx/superslicer-2.3.56.7/work/SuperSlicer-2.3.56.7/src/libslic3r -Isrc/libslic3r -I/var/tmp/portage/media-gfx/superslicer-2.3.56.7/work/SuperSlicer-2.3.56.7/src/libnest2d/include -I/var/tmp/portage/media-gfx/superslicer-2.3.56.7/work/SuperSlicer-2.3.56.7/src/glu-libtess/include -isystem /usr/include/eigen3 -isystem /usr/include/miniz -isystem /usr/include/OpenEXR  -DNDEBUG -march=skylake -O2 -pipe -fomit-frame-pointer -ftree-vectorize -fext-numeric-literals -Wall -Wno-reorder -fPIC -Werror=return-type -Wno-ignored-attributes -Wno-unknown-pragmas -pthread -DOPENVDB_ABI_VERSION_NUMBER=7 -std=gnu++17 -MD -MT src/libslic3r/CMakeFiles/libslic3r.dir/Fill/FillRectilinear.cpp.o -MF src/libslic3r/CMakeFiles/libslic3r.dir/Fill/FillRectilinear.cpp.o.d -o src/libslic3r/CMakeFiles/libslic3r.dir/Fill/FillRectilinear.cpp.o -c /var/tmp/portage/media-gfx/superslicer-2.3.56.7/work/SuperSlicer-2.3.56.7/src/libslic3r/Fill/FillRectilinear.cpp
/var/tmp/portage/media-gfx/superslicer-2.3.56.7/work/SuperSlicer-2.3.56.7/src/libslic3r/Fill/FillRectilinear.cpp: In function ‘void Slic3r::slice_region_by_vertical_lines(const Slic3r::FillRectilinear*, std::vector<Slic3r::SegmentedIntersectionLine>&, const Slic3r::ExPolygonWithOffset&)’:
/var/tmp/portage/media-gfx/superslicer-2.3.56.7/work/SuperSlicer-2.3.56.7/src/libslic3r/Fill/FillRectilinear.cpp:994:27: error: variable ‘Slic3r::SVG svg’ has initializer but incomplete type
  994 |         ::Slic3r::SVG svg(debug_out_path("slice_region_by_vertical_lines-failed-%d.svg", iRun++), bbox);
      |                           ^~~~~~~~~~~~~

I beleive this line should be wrapped into #ifdef SLIC3R_DEBUG because SVG.h only included in this file only when SLIC3R_DEBUG is enabled (note I have a very limited C++ knowledge)

Build environment

• Cmake flags:

-DSLIC3R_FHS=1
-DSLIC3R_GTK=3
-DSLIC3R_GUI=1
-DSLIC3R_PCH=0
-DSLIC3R_WX_STABLE=1

• GCC version: 10.3.0

Desktop (please complete the following information):

• OS: Linux
• Version: 2.3.56.7

[supermerill]

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