/usr/bin/feelpp_excompiler is in libfeel++1 1:0.95.0-final-2build2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 | #!/bin/sh
#set -x
soname=`basename $1 .cpp`.so
/usr/bin/cc -DUSE_STANDARD_HEADERS_IN_GINAC_EXCOMPILER -I/build/buildd/feel++-0.95.0-final/contrib/ginac/tools/ -I/usr/include/feel/ginac -I/usr/include/feel/ginac -O3 -x c -fPIC -shared -Wl,-soname,$soname -o $soname $1
#/usr/bin/g++ -x c -fPIC -shared -o $1.so $1
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