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Patch for _Complex: pedwarn for ++ and --
- To: <gcc-patches at gcc dot gnu dot org>
- Subject: Patch for _Complex: pedwarn for ++ and --
- From: "Joseph S. Myers" <jsm28 at cam dot ac dot uk>
- Date: Tue, 31 Oct 2000 01:56:53 +0000 (GMT)
This fixes another case of making the handling of complex types follow
C99: C99 doesn't allow ++ and -- to be applied to complex types, so a
pedantic warning is needed.
Bootstrapped with no regressions on i686-pc-linux-gnu. OK to commit?
gcc/ChangeLog:
2000-10-31 Joseph S. Myers <jsm28@cam.ac.uk>
* c-typeck.c (build_unary_op): If pedantic, pedwarn for increment
and decrement of complex types.
gcc/testsuite/ChangeLog:
2000-10-31 Joseph S. Myers <jsm28@cam.ac.uk>
* gcc.dg/c99-complex-2.c: New test.
--- c-typeck.c.orig Sat Oct 28 10:48:45 2000
+++ c-typeck.c Tue Oct 31 00:00:08 2000
@@ -2909,6 +2909,9 @@ build_unary_op (code, xarg, noconvert)
{
tree real, imag;
+ if (pedantic)
+ pedwarn ("ISO C does not support `++' and `--' on complex types");
+
arg = stabilize_reference (arg);
real = build_unary_op (REALPART_EXPR, arg, 1);
imag = build_unary_op (IMAGPART_EXPR, arg, 1);
--- testsuite/gcc.dg/c99-complex-2.c.orig Fri Sep 11 11:31:59 1998
+++ testsuite/gcc.dg/c99-complex-2.c Tue Oct 31 00:05:51 2000
@@ -0,0 +1,22 @@
+/* Test for _Complex: in C99 only. Test for increment and decrement. */
+/* Origin: Joseph Myers <jsm28@cam.ac.uk> */
+/* { dg-do compile } */
+/* { dg-options "-std=iso9899:1999 -pedantic-errors" } */
+
+/* Use of ++ and -- on complex types (both prefix and postfix) is a
+ C99 constraint violation (6.5.2.4p1, 6.5.3.1p1).
+*/
+
+_Complex double
+foo (_Complex double z)
+{
+ z++; /* { dg-bogus "warning" "warning in place of error" } */
+ /* { dg-error "complex" "postinc" { target *-*-* } 13 } */
+ ++z; /* { dg-bogus "warning" "warning in place of error" } */
+ /* { dg-error "complex" "preinc" { target *-*-* } 15 } */
+ z--; /* { dg-bogus "warning" "warning in place of error" } */
+ /* { dg-error "complex" "postdec" { target *-*-* } 17 } */
+ --z; /* { dg-bogus "warning" "warning in place of error" } */
+ /* { dg-error "complex" "predec" { target *-*-* } 19 } */
+ return z;
+}
--
Joseph S. Myers
jsm28@cam.ac.uk