/usr/share/gccxml-0.9/gccxml_config is in gccxml 0.9.0+git20140716-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | GCCXML_COMPILER="/usr/bin/c++"
GCCXML_CXXFLAGS="-g -O2 -fstack-protector-strong -Wformat -Werror=format-security -D_FORTIFY_SOURCE=2 "
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