User/joschonb/asan cleanup (colmap#1391)

* Add Address Sanitizer options and fix reported issues

* Add CI build

* Fix

* Asan with clang

* Small cosmetic fixes to recent ASan support

.azure-pipelines/build-ubuntu.yaml

@@ -5,7 +5,7 @@ parameters:
   asanEnabled: false
 
 jobs:
-- job: ubuntu_build_${{ replace(parameters.ubuntuVersion, '.', '') }}_cuda_${{ parameters.cudaEnabled }}_asa_${{ parameters.asanEnabled }}
+- job: ubuntu_build_${{ replace(parameters.ubuntuVersion, '.', '') }}_cuda_${{ parameters.cudaEnabled }}_asan_${{ parameters.asanEnabled }}
   displayName: '${{ parameters.displayName }}'
   pool:
     vmImage: 'ubuntu-${{ parameters.ubuntuVersion }}'
@@ -47,7 +47,7 @@ jobs:
         sudo apt-get install -y clang-10
         echo '##vso[task.setvariable variable=CC]/usr/bin/clang'
         echo '##vso[task.setvariable variable=CXX]/usr/bin/clang++'
-      displayName: 'Install CUDA'
+      displayName: 'Install Clang'
 
   - script: |
       cmake --version

CMakeLists.txt

@@ -200,7 +200,7 @@ else()
 endif()
 
 if(ASAN_ENABLED)
-    message(STATUS "Enabling ASan flags")
+    message(STATUS "Enabling ASan support")
     if(IS_CLANG OR IS_GNU)
         add_compile_options(-fsanitize=address -fno-omit-frame-pointer -fsanitize-address-use-after-scope)
         add_link_options(-fsanitize=address)