Dear all,

the previous patches to this PR unfortunately caused a regression,
seen on Power big-endian systems/-m32 (pr110419), and while trying
to investigate on x86 also showed a regression (ICE) on cases that
were not covered in the testsuite before.

The original fix did not properly handle the dereferencing of
string arguments that were not constant, and it was lacking the
truncation of strings to length one that is needed when passing
a character on the stack.

This patch has been regtested on x86_64-pc-linux-gnu,
and the extended testcase was scrutinized with -m64 and -m32.

Pushed after discussion in the PR with Mikael as
commit r14-2171-g8736d6b14a4dfdfb58c80ccd398981b0fb5d00aa

https://gcc.gnu.org/g:8736d6b14a4dfdfb58c80ccd398981b0fb5d00aa

Will keep the PR open as long as the issues on Power big-endian
are not confirmed resolved.

Thanks,
Harald