Fix char bitfields corner case

See testcase.

2 files changed, 7 insertions, 1 deletions

diff --git a/tccgen.c b/tccgen.c
index 2cdb4f1..d558ff8 100644
--- a/tccgen.c
+++ b/tccgen.c
@@ -3387,7 +3387,7 @@ static void struct_layout(CType *type, AttributeDef *ad)
 		int ofs = (c * 8 + bit_pos) % (typealign * 8);
 		int ofs2 = ofs + bit_size + (typealign * 8) - 1;
 		if (bit_size == 0 ||
-		    (typealign != 1 &&
+		    ((typealign != 1 || size == 1) &&
 		     (ofs2 / (typealign * 8)) > (size/typealign))) {
 		    c = (c + ((bit_pos + 7) >> 3) + typealign - 1) & -typealign;
 		    bit_pos = 0;
diff --git a/tests/tcctest.c b/tests/tcctest.c
index 988b212..c267fee 100644
--- a/tests/tcctest.c
+++ b/tests/tcctest.c
@@ -2069,6 +2069,12 @@ void bitfield_test(void)
     } st3;
     printf("sizeof(st3) = %d\n", sizeof(st3));
 #endif
+    struct sbf4 {
+	int x : 31;
+	char y : 2;
+    } st4;
+    st4.y = 1;
+    printf("st4.y == %d\n", st4.y);
 }
 
 #ifdef __x86_64__