/usr/lib/gcc-cross/sh4-linux-gnu/7/plugin/include/sysroot-suffix.h is in gcc-7-plugin-dev-sh4-linux-gnu 7.3.0-16ubuntu3cross1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | #undef SYSROOT_SUFFIX_SPEC
#define SYSROOT_SUFFIX_SPEC ""
|