Accepting request 734103 from home:fsirl:doxygen-libclang

Hi,
this request adds optional support for doxygen with libclang integration to the specfile. Doxygen with libclang support is regularly requested by my users, so it would be nice to have upstream. The build currently only fails against SUSE-SLE-15-SP1:Update because the following clang7 change hasn't been backported yet:
* Mon Jul 01 2019 Aaron Puchert <aaronpuchert@alice-dsl.net>
- Add a clang-%{_sonum} symlink, which is referenced by
  /usr/lib64/cmake/clang/ClangTargets.cmake (boo#1138457)

Franz.

OBS-URL: https://build.opensuse.org/request/show/734103
OBS-URL: https://build.opensuse.org/package/show/devel:tools/doxygen?expand=0&rev=140

doxygen.spec

@@ -16,6 +16,9 @@
 #
 
 
+# build with "--with libclang" to enable libclang support
+%bcond_with libclang
+
 Name:           doxygen
 Version:        1.8.16
 Release:        0
@@ -35,12 +38,16 @@ Patch3:         vhdlparser-no-return.patch
 Patch4:         doxygen-dot-one-thread.patch
 # really do not require git executable
 Patch5:         doxygen-git-not-required.patch
+Patch6:         doxygen-llvm-libs.patch
 BuildRequires:  bison
 BuildRequires:  cmake >= 2.8.12
 BuildRequires:  flex
 BuildRequires:  gcc-c++
 BuildRequires:  python3-base
 BuildRequires:  python3-xml
+%if %{with libclang}
+BuildRequires:  llvm-clang-devel
+%endif
 # Do not bother building documentation with latex since it is present on the
 # web trivialy for all versions of doxygen
 Obsoletes:      doxygen-doc
@@ -62,6 +69,9 @@ as well.
 %patch4 -p1
 %endif
 %patch5 -p1
+%if %{with libclang}
+%patch6
+%endif
 
 %build
 %cmake \
@@ -69,6 +79,9 @@ as well.
     -Dbuild_xmlparser=ON \
     -Dbuild_search=OFF \
     -Dbuild_wizard=OFF \
+%if %{with libclang}
+    -Duse_libclang=ON \
+%endif
     -DCMAKE_EXE_LINKER_FLAGS="-Wl,--as-needed -Wl,-z,relro,-z,now" \
     -DCMAKE_MODULE_LINKER_FLAGS="-Wl,--as-needed -Wl,-z,relro,-z,now" \
     -DCMAKE_SHARED_LINKER_FLAGS="-Wl,--as-needed -Wl,-z,relro,-z,now" \