gimplify: Handle void expression as asm input [PR100501, PR100792]

As reported in bug 100501 (plus duplicates), the gimplifier ICEs for C
tests involving a statement expression not returning a value as an asm
input; this includes the variant bug 100792 where the statement
expression ends with another asm statement.

The expected diagnostic for this case (as seen for C++ input) is one
coming from the gimplifier and so it seems reasonable to fix the
gimplifier to handle the GENERIC generated for this case by the C
front end, rather than trying to make the C front end detect it
earlier.  Thus the gimplifier to handle a void
expression like other non-lvalues for such a memory input.

Bootstrapped with no regressions for x86_64-pc-linux-gnu.  OK to commit?

	PR c/100501
	PR c/100792

gcc/
	* gimplify.cc (gimplify_asm_expr): Handle void expressions for
	memory inputs like other non-lvalues.

gcc/testsuite/
	* gcc.dg/pr100501-1.c, gcc.dg/pr100792-1.c: New tests.
	* gcc.dg/pr48552-1.c, gcc.dg/pr48552-2.c,
	gcc.dg/torture/pr98601.c: Update expected errors.

Co-authored-by: Richard Biener <rguenther@suse.de>

0 files changed, 0 insertions, 0 deletions