[gcc/devel/gccgo] Fix ICE with cast of division by zero (PR c/93348).

[gcc/devel/gccgo] Fix ICE with cast of division by zero (PR c/93348).

[Ian Lance Taylor]

https://gcc.gnu.org/g:ac68e287fc2e939ae6b45ba7ff04e493982b7f62

commit ac68e287fc2e939ae6b45ba7ff04e493982b7f62
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Wed Jan 22 01:23:42 2020 +0000

    Fix ICE with cast of division by zero (PR c/93348).
    
    Bug 93348 reports an ICE on certain cases of casts of expressions that
    may appear only in unevaluated parts of integer constant expressions,
    arising from the generation of nested C_MAYBE_CONST_EXPRs.  This patch
    fixes it by adding a call to remove_c_maybe_const_expr in the
    integer-operands case, as is done in other similar cases.
    
    Bootstrapped with no regressions for x86_64-pc-linux-gnu.
    
    	PR c/93348
    gcc/c:
    	* c-typeck.c (build_c_cast): Call remove_c_maybe_const_expr on
    	argument with integer operands.
    
    gcc/testsuite:
    	* gcc.c-torture/compile/pr93348-1.c: New test.

Diff:
---
 gcc/c/ChangeLog                                 | 6 ++++++
 gcc/c/c-typeck.c                                | 2 ++
 gcc/testsuite/ChangeLog                         | 5 +++++
 gcc/testsuite/gcc.c-torture/compile/pr93348-1.c | 5 +++++
 4 files changed, 18 insertions(+)

diff --git a/gcc/c/ChangeLog b/gcc/c/ChangeLog
index c638756..9497365 100644
--- a/gcc/c/ChangeLog
+++ b/gcc/c/ChangeLog
@@ -1,3 +1,9 @@
+2020-01-22  Joseph Myers  <joseph@codesourcery.com>
+
+	PR c/93348
+	* c-typeck.c (build_c_cast): Call remove_c_maybe_const_expr on
+	argument with integer operands.
+
 2020-01-16  Kerem Kat  <keremkat@gmail.com>
 
 	PR c/92833
diff --git a/gcc/c/c-typeck.c b/gcc/c/c-typeck.c
index 9866c83..8df0849 100644
--- a/gcc/c/c-typeck.c
+++ b/gcc/c/c-typeck.c
@@ -5715,6 +5715,8 @@ build_c_cast (location_t loc, tree type, tree expr)
     expr = TREE_OPERAND (expr, 0);
 
   value = expr;
+  if (int_operands)
+    value = remove_c_maybe_const_expr (value);
 
   if (type == error_mark_node || expr == error_mark_node)
     return error_mark_node;
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 9681453..f72c987 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2020-01-22  Joseph Myers  <joseph@codesourcery.com>
+
+	PR c/93348
+	* gcc.c-torture/compile/pr93348-1.c: New test.
+
 2020-01-21  David Malcolm  <dmalcolm@redhat.com>
 
 	PR analyzer/93352
diff --git a/gcc/testsuite/gcc.c-torture/compile/pr93348-1.c b/gcc/testsuite/gcc.c-torture/compile/pr93348-1.c
new file mode 100644
index 0000000..d2edec5
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/compile/pr93348-1.c
@@ -0,0 +1,5 @@
+int
+ya (void)
+{
+  return (long int) (1 / 0);
+}