Set symbol visibility to default for Debian 10 (Buster) in GitLab CI

Boost.Test 1.67 has issues with hidden symbols.
Ref.: boostorg/test#199

.gitlab-ci.yml

@@ -58,6 +58,20 @@ default:
     - cd "$CI_PROJECT_DIR"
     - if [ ! -e build ]; then mkdir build; fi
     - cd build/
+    - >
+      # Symbol visibility is set to default because Boost.Test 1.67
+      # from Debian 10 (Buster) has issues with hidden symbols
+      # Ref.: https://github.com/boostorg/test/issues/199
+      export BOOST_VERSION="$(grep -F '#define BOOST_VERSION ' /usr/include/boost/version.hpp | awk '{ print $3; }')";
+      echo "BOOST_VERSION: $BOOST_VERSION";
+      if [ "$BOOST_VERSION" = "106700" ]; then
+          CMAKE_VISIBILITY_OPTIONS=\
+            -DCMAKE_CXX_VISIBILITY_PRESET=default \
+            -DCMAKE_C_VISIBILITY_PRESET=default \
+            -DCMAKE_VISIBILITY_INLINES_HIDDEN=OFF ;
+      else
+          CMAKE_VISIBILITY_OPTIONS= ;
+      fi
     - >
       cmake \
         "-DCMAKE_BUILD_TYPE=${BUILD_TYPE}" \
@@ -66,6 +80,7 @@ default:
         -DHBRS_MPL_ENABLE_BENCHMARKS=ON \
         -DHBRS_MPL_ENABLE_ELEMENTAL=ON \
         -DHBRS_MPL_ENABLE_MATLAB=OFF \
+        $CMAKE_VISIBILITY_OPTIONS \
         .. || { cat CMakeFiles/CMakeError.log; exit 255; };
     - make "-j$(nproc)"
     - ccache -s