Incremental build problems

[linev]

• Checked for duplicates

Describe the bug

After llvm update I getting problem with incremental ROOT builds.
For instance, I trying to rebuild libAfterImage by executing in build directory:

 rm -rf AFTERIMAGE-prefix lib/libAfterImage.a lib/libASImage.so    

libAfterImage.a is rebuild, but ROOT compilation fails at the point:

In file included from input_line_10:3:
In file included from /home/linev/build/webgui/include/Fit/BasicFCN.h:18:
In file included from /home/linev/build/webgui/include/Math/IParamFunction.h:20:
In file included from /home/linev/build/webgui/include/Math/Util.h:28:
/home/linev/build/webgui/include/Math/Types.h:19:2: fatal error: module file '/home/linev/build/webgui/lib/std.pcm' is out of date and needs to be rebuilt: signature mismatch
#include <Vc/Vc>
 ^
/home/linev/build/webgui/include/Math/Types.h:19:2: note: imported by module 'Vc' in '/home/linev/build/webgui/lib/Vc.pcm'
[ 74%] Built target testInterpreterLock
[ 74%] Built target testImt
Error: /home/linev/build/webgui/bin/rootcling: compilation failure (/home/linev/build/webgui/lib/libMathCorecc902379ff_dictUmbrella.h)
make[2]: *** [math/mathcore/CMakeFiles/G__MathCore.dir/build.make:260: math/mathcore/G__MathCore.cxx] Error 1
make[1]: *** [CMakeFiles/Makefile2:31016: math/mathcore/CMakeFiles/G__MathCore.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....

If I call cmake command directly, it may complete to the end, but then ROOT has problems executing hsimple.C

% root.exe -l -b $ROOTSYS/tutorials/hsimple.C -q                                                                                                              (04.03. 14:31:36) !10127 

Processing /home/linev/build/webgui/tutorials/hsimple.C...
hsimple   : Real Time =   0.04 seconds Cpu Time =   0.04 seconds
root.exe: /home/linev/git/webgui/interpreter/llvm/src/tools/clang/include/clang/Basic/Diagnostic.h:1299: clang::DiagnosticBuilder clang::DiagnosticsEngine::Report(clang::SourceLocation, unsigned int): Assertion `CurDiagID == std::numeric_limits<unsigned>::max() && "Multiple diagnostics in flight at once!"' failed.
[1]    25284 IOT instruction (core dumped)  root.exe -l -b $ROOTSYS/tutorials/hsimple.C -q

[linev]

For completeness - my cmake command:

cmake -Droot7=ON -Dfcgi=ON -DCMAKE_CXX_STANDARD=17 -Dwebgui=ON -Dqt5web=ON -Dcefweb=ON -Dtesting=ON -DPYTHON_EXECUTABLE=/usr/bin/python3 -Doracle=ON -DORACLE_PATH_INCLUDES=/home/linev/d/occi/include -DORACLE_PATH_LIB=/home/linev/d/occi/lib/ -DORACLE_OCI_VERSION=10G_R2 -Dodbc=ON -Dpgsql=ON -Dveccore=ON -Dvc=ON -Dbuiltin_vc=ON -Dvdt=ON -Dbuiltin_vdt=ON -Dbuiltin_gsl=ON -Dmpi=ON -Dall=ON -Dxrootd=ON -Dbuiltin_davix=ON -Dbuiltin_tbb=OFF <path_to_source>

[linev]

If I removing -Dall=ON, re-compilation works,

[linev]

Seems to be, after recent patches incremental build is working now on the master.
I will check if 6.24 fixed as well

[linev]

Also 6.24 branch works properly