https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65550
--- Comment #5 from Mikhail Maltsev <maltsevm at gmail dot com> ---
Or even simpler:
#!/bin/bash
mkdir -p ./src
mkdir -p ./build/src/preproc.h.gch
touch ./src/preproc.h
cat << EOF >./src/include.h
#include "src/preproc.h"
/* line 1 */
/* line 2 */
EOF
cat << EOF >./src/source.cpp
#include "include.h"
/* a single line with at least 128 columns and one token */
token
EOF
cd ./build
cc1plus ../src/preproc.h --output-pch=src/preproc.h.gch/pch_file
cc1plus -I . ../src/source.cpp
