diff --git a/gcc/c/c-typeck.cc b/gcc/c/c-typeck.cc
index 3b519c48ae0a17951e394dac131f32485ad974cc..ddeab1e2a8a1c960f357ff41e008d170a4381f26 100644
--- a/gcc/c/c-typeck.cc
+++ b/gcc/c/c-typeck.cc
@@ -13572,7 +13572,17 @@ c_objc_common_truthvalue_conversion (location_t location, tree expr, tree type)
       break;
     }
 
-  int_const = (TREE_CODE (expr) == INTEGER_CST && !TREE_OVERFLOW (expr));
+  /* Conversion of a floating constant to boolean goes through here
+     and yields an integer constant expression.  Otherwise, the result
+     is only an integer constant expression if the argument is.  */
+  int_const = ((TREE_CODE (expr) == INTEGER_CST && !TREE_OVERFLOW (expr))
+	       || ((TREE_CODE (expr) == REAL_CST
+		    || TREE_CODE (expr) == COMPLEX_CST)
+		   && (TREE_CODE (type) == BOOLEAN_TYPE
+		       || (TREE_CODE (type) == ENUMERAL_TYPE
+			   && ENUM_UNDERLYING_TYPE (type) != NULL_TREE
+			   && (TREE_CODE (ENUM_UNDERLYING_TYPE (type))
+			       == BOOLEAN_TYPE)))));
   int_operands = EXPR_INT_CONST_OPERANDS (expr);
   if (int_operands && TREE_CODE (expr) != INTEGER_CST)
     {
diff --git a/gcc/testsuite/gcc.dg/pr113776-1.c b/gcc/testsuite/gcc.dg/pr113776-1.c
new file mode 100644
index 0000000000000000000000000000000000000000..36190fbc3fec23eae753e37b04ccdc9f47c25afb
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr113776-1.c
@@ -0,0 +1,5 @@
+/* { dg-do compile } */
+/* { dg-options "-std=c11 -pedantic" } */
+
+char d[(_Bool)0.5 == 1 ? 1 : -1];
+char f[(_Bool)0.0 == 0 ? 1 : -1];
diff --git a/gcc/testsuite/gcc.dg/pr113776-2.c b/gcc/testsuite/gcc.dg/pr113776-2.c
new file mode 100644
index 0000000000000000000000000000000000000000..9e88210892a41676c9854a8da3bb2cfb2a786351
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr113776-2.c
@@ -0,0 +1,4 @@
+/* { dg-do compile } */
+/* { dg-options "-std=c11 -pedantic" } */
+
+enum e { A = (_Bool) 0.0, B = (_Bool) 0.5, C = (_Bool) 1.0 };
diff --git a/gcc/testsuite/gcc.dg/pr113776-3.c b/gcc/testsuite/gcc.dg/pr113776-3.c
new file mode 100644
index 0000000000000000000000000000000000000000..c615994a89f6ef5abf4f1538c8580cc3320a0753
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr113776-3.c
@@ -0,0 +1,7 @@
+/* { dg-do compile } */
+/* { dg-options "-std=c23 -pedantic" } */
+
+enum ebool : bool { BF, BT };
+
+char d[(enum ebool)0.5 == 1 ? 1 : -1];
+char f[(enum ebool)0.0 == 0 ? 1 : -1];
diff --git a/gcc/testsuite/gcc.dg/pr113776-4.c b/gcc/testsuite/gcc.dg/pr113776-4.c
new file mode 100644
index 0000000000000000000000000000000000000000..1b57557746e138f19295c6e5b44b0266a57ae501
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr113776-4.c
@@ -0,0 +1,6 @@
+/* { dg-do compile } */
+/* { dg-options "-std=c23 -pedantic" } */
+
+enum ebool : bool { BF, BT };
+
+enum e { A = (enum ebool) 0.0, B = (enum ebool) 0.5, C = (enum ebool) 1.0 };