Determining size of long double passed with the following output:
Change Dir: '/home/juli/Matlab/scctools/ports/c_symb/symengine/wasm/CMakeFiles/CMakeTmp'

Run Build Command(s): /usr/bin/cmake -E env VERBOSE=1 /usr/bin/make -f Makefile cmTC_4314f/fast
/usr/bin/make  -f CMakeFiles/cmTC_4314f.dir/build.make CMakeFiles/cmTC_4314f.dir/build
make[1]: Entering directory '/home/juli/Matlab/scctools/ports/c_symb/symengine/wasm/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_4314f.dir/SYMENGINE_SIZEOF_LONG_DOUBLE.c.o
/usr/lib/emsdk/upstream/emscripten/emcc    -MD -MT CMakeFiles/cmTC_4314f.dir/SYMENGINE_SIZEOF_LONG_DOUBLE.c.o -MF CMakeFiles/cmTC_4314f.dir/SYMENGINE_SIZEOF_LONG_DOUBLE.c.o.d -o CMakeFiles/cmTC_4314f.dir/SYMENGINE_SIZEOF_LONG_DOUBLE.c.o -c /home/juli/Matlab/scctools/ports/c_symb/symengine/wasm/CMakeFiles/CheckTypeSize/SYMENGINE_SIZEOF_LONG_DOUBLE.c
Linking C executable cmTC_4314f.js
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_4314f.dir/link.txt --verbose=1
cache:INFO: generating system asset: symbol_lists/d62a895641a526e90b84a30e4a37de17209b9f0b.json... (this will be cached in "/usr/lib/emsdk/upstream/emscripten/cache/symbol_lists/d62a895641a526e90b84a30e4a37de17209b9f0b.json" for subsequent builds)
cache:INFO:  - ok
/usr/lib/emsdk/upstream/emscripten/emcc @CMakeFiles/cmTC_4314f.dir/objects1.rsp -o cmTC_4314f.js @CMakeFiles/cmTC_4314f.dir/linkLibs.rsp
make[1]: Leaving directory '/home/juli/Matlab/scctools/ports/c_symb/symengine/wasm/CMakeFiles/CMakeTmp'