[PATCH v2 1/8] Add tests for validating future C permerrors

[Florian Weimer <fweimer@redhat.com>]

The dg-error directives for gcc.dg/permerror-system.c can be generated
using (for the most part at least):

perl -ne 'print if s,.*(/\* \{ dg-error .*) } \*/$,$1 "" { target *-*-* } $. } */,' \
  < gcc/testsuite/gcc.dg/permerror-default.c

gcc/testsuite/

	* gcc.dg/permerror-default.c: New test.
	* gcc.dg/permerror-fpermissive.c: Likewise.
	* gcc.dg/permerror-gnu89-pedantic.c: Likewise.
	* gcc.dg/permerror-gnu89.c: Likewise.
	* gcc.dg/permerror-noerror.c: Likewise.
	* gcc.dg/permerror-pedantic.c: Likewise.
	* gcc.dg/permerror-system.c: Likewise.
---
 gcc/testsuite/gcc.dg/permerror-default.c      | 85 +++++++++++++++++++
 gcc/testsuite/gcc.dg/permerror-fpermissive.c  | 85 +++++++++++++++++++
 .../gcc.dg/permerror-gnu89-pedantic.c         | 85 +++++++++++++++++++
 gcc/testsuite/gcc.dg/permerror-gnu89.c        | 85 +++++++++++++++++++
 gcc/testsuite/gcc.dg/permerror-noerror.c      | 85 +++++++++++++++++++
 gcc/testsuite/gcc.dg/permerror-pedantic.c     | 85 +++++++++++++++++++
 gcc/testsuite/gcc.dg/permerror-system.c       |  9 ++
 7 files changed, 519 insertions(+)
 create mode 100644 gcc/testsuite/gcc.dg/permerror-default.c
 create mode 100644 gcc/testsuite/gcc.dg/permerror-fpermissive.c
 create mode 100644 gcc/testsuite/gcc.dg/permerror-gnu89-pedantic.c
 create mode 100644 gcc/testsuite/gcc.dg/permerror-gnu89.c
 create mode 100644 gcc/testsuite/gcc.dg/permerror-noerror.c
 create mode 100644 gcc/testsuite/gcc.dg/permerror-pedantic.c
 create mode 100644 gcc/testsuite/gcc.dg/permerror-system.c

diff --git a/gcc/testsuite/gcc.dg/permerror-default.c b/gcc/testsuite/gcc.dg/permerror-default.c
new file mode 100644
index 00000000000..ea0be1dc89f
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/permerror-default.c
@@ -0,0 +1,85 @@
+/* { dg-options "" } */
+
+/* Overview test for C permerrors.  This test should be kept in sync with the
+   other permerror-* tests.  If new permerrors are added, test cases should be
+   added to this and the other files.  */
+
+void
+implicit_function_declaration (void)
+{
+  f1 (); /* { dg-warning "'f1' \\\[-Wimplicit-function-declaration\\\]" } */
+}
+
+extern implicit_int_1; /* { dg-warning "'implicit_int_1' \\\[-Wimplicit-int\\\]" } */
+typedef implicit_int_2; /* { dg-warning "'implicit_int_2' \\\[-Wimplicit-int\\\]" } */
+extern implicit_int_3 (void); /* { dg-warning "'implicit_int_3' \\\[-Wimplicit-int\\]" } */
+implicit_int_4 (i) /* { dg-warning "return type defaults to 'int' \\\[-Wimplicit-int\\\]" } */
+/* { dg-warning "type of 'i' defaults to 'int' \\\[-Wimplicit-int\\\]" "" { target *-*-*} .-1 } */
+{
+  (const) 0; /* { dg-warning "type defaults to 'int' in type name \\\[-Wimplicit-int\\\]" } */
+}
+
+extern int missing_parameter_type (i); /* { dg-warning "parameter names \\\(without types\\\) in function declaration\n" } */
+
+
+int *
+int_conversion_1 (int flag)
+{
+  void f2 (int *);
+  flag ? "1" : 1; /* { dg-warning "pointer/integer type mismatch in conditional expression \\\[-Wint-conversion\\\]" } */
+  flag ? 1 : "1"; /* { dg-warning "pointer/integer type mismatch in conditional expression \\\[-Wint-conversion\\\]" } */
+  f2 (flag); /* { dg-warning "passing argument 1 of 'f2' makes pointer from integer without a cast \\\[-Wint-conversion\\\]" } */
+  {
+    int i1 = &flag; /* { dg-warning "initialization of 'int' from 'int \\\*' makes integer from pointer without a cast \\\[-Wint-conversion\\\]" } */
+    i1 = &flag; /* { dg-warning "assignment to 'int' from 'int \\\*' makes integer from pointer without a cast \\\[-Wint-conversion\\\]" } */
+  }
+  return flag; /* { dg-warning "returning 'int' from a function with return type 'int \\\*' makes pointer from integer without a cast \\\[-Wint-conversion\\\]" } */
+}
+
+int
+int_conversion_2 (int flag)
+{
+  void f3 (int);
+  f3 (&flag); /* { dg-warning "passing argument 1 of 'f3' makes integer from pointer without a cast \\\[-Wint-conversion\\\]" } */
+  {
+    int *i1 = flag; /* { dg-warning "initialization of 'int \\\*' from 'int' makes pointer from integer without a cast \\\[-Wint-conversion\\\]" } */
+    i1 = flag; /* { dg-warning "assignment to 'int \\\*' from 'int' makes pointer from integer without a cast \\\[-Wint-conversion\\\]" } */
+  }
+  return &flag; /* { dg-warning "returning 'int \\\*' from a function with return type 'int' makes integer from pointer without a cast \\\[-Wint-conversion\\\]" } */
+}
+
+int *
+incompatible_pointer_types (int flag)
+{
+  void f4 (int *);
+  flag ? __builtin_abs : __builtin_labs; /* { dg-warning "pointer type mismatch in conditional expression \\\[-Wincompatible-pointer-types\\\]" } */
+  {
+    int *p1 = __builtin_abs; /* { dg-warning "initialization of 'int \\\*' from pointer to '__builtin_abs' with incompatible type 'int \\\(\\\*\\\)\\\(int\\\)' \\\[-Wincompatible-pointer-types\\\]" } */
+    p1 = __builtin_abs; /* { dg-warning "assignment to 'int \\\*' from pointer to '__builtin_abs' with incompatible type 'int \\\(\\\*\\\)\\\(int\\\)' \\\[-Wincompatible-pointer-types\\\]" } */
+  }
+  {
+    int *p2 = incompatible_pointer_types; /* { dg-warning "initialization of 'int \\\*' from incompatible pointer type 'int \\\* \\\(\\\*\\\)\\\(int\\\)' \\\[-Wincompatible-pointer-types\\\]" } */
+    p2 = incompatible_pointer_types; /* { dg-warning "assignment to 'int \\\*' from incompatible pointer type 'int \\\* \\\(\\\*\\\)\\\(int\\\)' \\\[-Wincompatible-pointer-types\\\]" } */
+    {
+      int *p3 = &p2; /* { dg-warning "initialization of 'int \\\*' from incompatible pointer type 'int \\\*\\\*' \\\[-Wincompatible-pointer-types\\\]" } */
+      p3 = &p2; /* { dg-warning "assignment to 'int \\\*' from incompatible pointer type 'int \\\*\\\*' \\\[-Wincompatible-pointer-types\\\]" } */
+    }
+    f4 (&p2); /* { dg-warning "passing argument 1 of 'f4' from incompatible pointer type \\\[-Wincompatible-pointer-types\\\]" } */
+  }
+  if (flag)
+    return __builtin_abs; /* { dg-warning "returning pointer to '__builtin_abs' of type 'int \\\(\\\*\\\)\\\(int\\\)' from a function with incompatible type 'int \\\*' \\\[-Wincompatible-pointer-types\\\]" } */
+  else
+    return incompatible_pointer_types; /* { dg-warning "returning 'int \\\* \\\(\\\*\\\)\\\(int\\\)' from a function with incompatible return type 'int \\\*' \\\[-Wincompatible-pointer-types\\\]" } */
+}
+
+void
+return_mismatch_1 (void)
+{
+  return 0; /* { dg-warning "'return' with a value, in function returning void \\\[-Wreturn-mismatch\\\]" } */
+}
+
+int
+return_mismatch_2 (void)
+{
+  return; /* { dg-warning "return' with no value, in function returning non-void \\\[-Wreturn-mismatch\\\]" } */
+}
diff --git a/gcc/testsuite/gcc.dg/permerror-fpermissive.c b/gcc/testsuite/gcc.dg/permerror-fpermissive.c
new file mode 100644
index 00000000000..139f35ad1c0
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/permerror-fpermissive.c
@@ -0,0 +1,85 @@
+/* { dg-options "-fpermissive" } */
+
+/* Overview test for C permerrors.  This test should be kept in sync with the
+   other permerror-* tests.  If new permerrors are added, test cases should be
+   added to this and the other files.  */
+
+void
+implicit_function_declaration (void)
+{
+  f1 (); /* { dg-warning "'f1' \\\[-Wimplicit-function-declaration\\\]" } */
+}
+
+extern implicit_int_1; /* { dg-warning "'implicit_int_1' \\\[-Wimplicit-int\\\]" } */
+typedef implicit_int_2; /* { dg-warning "'implicit_int_2' \\\[-Wimplicit-int\\\]" } */
+extern implicit_int_3 (void); /* { dg-warning "'implicit_int_3' \\\[-Wimplicit-int\\]" } */
+implicit_int_4 (i) /* { dg-warning "return type defaults to 'int' \\\[-Wimplicit-int\\\]" } */
+/* { dg-warning "type of 'i' defaults to 'int' \\\[-Wimplicit-int\\\]" "" { target *-*-*} .-1 } */
+{
+  (const) 0; /* { dg-warning "type defaults to 'int' in type name \\\[-Wimplicit-int\\\]" } */
+}
+
+extern int missing_parameter_type (i); /* { dg-warning "parameter names \\\(without types\\\) in function declaration\n" } */
+
+
+int *
+int_conversion_1 (int flag)
+{
+  void f2 (int *);
+  flag ? "1" : 1; /* { dg-warning "pointer/integer type mismatch in conditional expression \\\[-Wint-conversion\\\]" } */
+  flag ? 1 : "1"; /* { dg-warning "pointer/integer type mismatch in conditional expression \\\[-Wint-conversion\\\]" } */
+  f2 (flag); /* { dg-warning "passing argument 1 of 'f2' makes pointer from integer without a cast \\\[-Wint-conversion\\\]" } */
+  {
+    int i1 = &flag; /* { dg-warning "initialization of 'int' from 'int \\\*' makes integer from pointer without a cast \\\[-Wint-conversion\\\]" } */
+    i1 = &flag; /* { dg-warning "assignment to 'int' from 'int \\\*' makes integer from pointer without a cast \\\[-Wint-conversion\\\]" } */
+  }
+  return flag; /* { dg-warning "returning 'int' from a function with return type 'int \\\*' makes pointer from integer without a cast \\\[-Wint-conversion\\\]" } */
+}
+
+int
+int_conversion_2 (int flag)
+{
+  void f3 (int);
+  f3 (&flag); /* { dg-warning "passing argument 1 of 'f3' makes integer from pointer without a cast \\\[-Wint-conversion\\\]" } */
+  {
+    int *i1 = flag; /* { dg-warning "initialization of 'int \\\*' from 'int' makes pointer from integer without a cast \\\[-Wint-conversion\\\]" } */
+    i1 = flag; /* { dg-warning "assignment to 'int \\\*' from 'int' makes pointer from integer without a cast \\\[-Wint-conversion\\\]" } */
+  }
+  return &flag; /* { dg-warning "returning 'int \\\*' from a function with return type 'int' makes integer from pointer without a cast \\\[-Wint-conversion\\\]" } */
+}
+
+int *
+incompatible_pointer_types (int flag)
+{
+  void f4 (int *);
+  flag ? __builtin_abs : __builtin_labs; /* { dg-warning "pointer type mismatch in conditional expression \\\[-Wincompatible-pointer-types\\\]" } */
+  {
+    int *p1 = __builtin_abs; /* { dg-warning "initialization of 'int \\\*' from pointer to '__builtin_abs' with incompatible type 'int \\\(\\\*\\\)\\\(int\\\)' \\\[-Wincompatible-pointer-types\\\]" } */
+    p1 = __builtin_abs; /* { dg-warning "assignment to 'int \\\*' from pointer to '__builtin_abs' with incompatible type 'int \\\(\\\*\\\)\\\(int\\\)' \\\[-Wincompatible-pointer-types\\\]" } */
+  }
+  {
+    int *p2 = incompatible_pointer_types; /* { dg-warning "initialization of 'int \\\*' from incompatible pointer type 'int \\\* \\\(\\\*\\\)\\\(int\\\)' \\\[-Wincompatible-pointer-types\\\]" } */
+    p2 = incompatible_pointer_types; /* { dg-warning "assignment to 'int \\\*' from incompatible pointer type 'int \\\* \\\(\\\*\\\)\\\(int\\\)' \\\[-Wincompatible-pointer-types\\\]" } */
+    {
+      int *p3 = &p2; /* { dg-warning "initialization of 'int \\\*' from incompatible pointer type 'int \\\*\\\*' \\\[-Wincompatible-pointer-types\\\]" } */
+      p3 = &p2; /* { dg-warning "assignment to 'int \\\*' from incompatible pointer type 'int \\\*\\\*' \\\[-Wincompatible-pointer-types\\\]" } */
+    }
+    f4 (&p2); /* { dg-warning "passing argument 1 of 'f4' from incompatible pointer type \\\[-Wincompatible-pointer-types\\\]" } */
+  }
+  if (flag)
+    return __builtin_abs; /* { dg-warning "returning pointer to '__builtin_abs' of type 'int \\\(\\\*\\\)\\\(int\\\)' from a function with incompatible type 'int \\\*' \\\[-Wincompatible-pointer-types\\\]" } */
+  else
+    return incompatible_pointer_types; /* { dg-warning "returning 'int \\\* \\\(\\\*\\\)\\\(int\\\)' from a function with incompatible return type 'int \\\*' \\\[-Wincompatible-pointer-types\\\]" } */
+}
+
+void
+return_mismatch_1 (void)
+{
+  return 0; /* { dg-warning "'return' with a value, in function returning void \\\[-Wreturn-mismatch\\\]" } */
+}
+
+int
+return_mismatch_2 (void)
+{
+  return; /* { dg-warning "return' with no value, in function returning non-void \\\[-Wreturn-mismatch\\\]" } */
+}
diff --git a/gcc/testsuite/gcc.dg/permerror-gnu89-pedantic.c b/gcc/testsuite/gcc.dg/permerror-gnu89-pedantic.c
new file mode 100644
index 00000000000..465a16f5f9a
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/permerror-gnu89-pedantic.c
@@ -0,0 +1,85 @@
+/* { dg-options "-std=gnu89 -pedantic-errors" } */
+
+/* Overview test for C permerrors.  This test should be kept in sync with the
+   other permerror-* tests.  If new permerrors are added, test cases should be
+   added to this and the other files.  */
+
+void
+implicit_function_declaration (void)
+{
+  f1 (); /* { dg-bogus "-Wimplicit-function-declaration" } */
+}
+
+extern implicit_int_1; /* { dg-bogus "-Wimplicit-int" } */
+typedef implicit_int_2; /* { dg-bogus "-Wimplicit-int" } */
+extern implicit_int_3 (void); /* { dg-bogus "-Wimplicit-int" } */
+implicit_int_4 (i) /* { dg-bogus "-Wimplicit-int" } */
+/* Directive here in the other files.  */
+{
+  (const) 0; /* { dg-bogus "-Wimplicit-int" } */
+}
+
+extern int missing_parameter_type (i); /* { dg-error "parameter names \\\(without types\\\) in function declaration\n" } */
+
+
+int *
+int_conversion_1 (int flag)
+{
+  void f2 (int *);
+  flag ? "1" : 1; /* { dg-error "pointer/integer type mismatch in conditional expression \\\[-Wint-conversion\\\]" } */
+  flag ? 1 : "1"; /* { dg-error "pointer/integer type mismatch in conditional expression \\\[-Wint-conversion\\\]" } */
+  f2 (flag); /* { dg-error "passing argument 1 of 'f2' makes pointer from integer without a cast \\\[-Wint-conversion\\\]" } */
+  {
+    int i1 = &flag; /* { dg-error "initialization of 'int' from 'int \\\*' makes integer from pointer without a cast \\\[-Wint-conversion\\\]" } */
+    i1 = &flag; /* { dg-error "assignment to 'int' from 'int \\\*' makes integer from pointer without a cast \\\[-Wint-conversion\\\]" } */
+  }
+  return flag; /* { dg-error "returning 'int' from a function with return type 'int \\\*' makes pointer from integer without a cast \\\[-Wint-conversion\\\]" } */
+}
+
+int
+int_conversion_2 (int flag)
+{
+  void f3 (int);
+  f3 (&flag); /* { dg-error "passing argument 1 of 'f3' makes integer from pointer without a cast \\\[-Wint-conversion\\\]" } */
+  {
+    int *i1 = flag; /* { dg-error "initialization of 'int \\\*' from 'int' makes pointer from integer without a cast \\\[-Wint-conversion\\\]" } */
+    i1 = flag; /* { dg-error "assignment to 'int \\\*' from 'int' makes pointer from integer without a cast \\\[-Wint-conversion\\\]" } */
+  }
+  return &flag; /* { dg-error "returning 'int \\\*' from a function with return type 'int' makes integer from pointer without a cast \\\[-Wint-conversion\\\]" } */
+}
+
+int *
+incompatible_pointer_types (int flag)
+{
+  void f4 (int *);
+  flag ? __builtin_abs : __builtin_labs; /* { dg-warning "pointer type mismatch in conditional expression \\\[-Wincompatible-pointer-types\\\]" } */
+  {
+    int *p1 = __builtin_abs; /* { dg-error "initialization of 'int \\\*' from pointer to '__builtin_abs' with incompatible type 'int \\\(\\\*\\\)\\\(int\\\)' \\\[-Wincompatible-pointer-types\\\]" } */
+    p1 = __builtin_abs; /* { dg-error "assignment to 'int \\\*' from pointer to '__builtin_abs' with incompatible type 'int \\\(\\\*\\\)\\\(int\\\)' \\\[-Wincompatible-pointer-types\\\]" } */
+  }
+  {
+    int *p2 = incompatible_pointer_types; /* { dg-error "initialization of 'int \\\*' from incompatible pointer type 'int \\\* \\\(\\\*\\\)\\\(int\\\)' \\\[-Wincompatible-pointer-types\\\]" } */
+    p2 = incompatible_pointer_types; /* { dg-error "assignment to 'int \\\*' from incompatible pointer type 'int \\\* \\\(\\\*\\\)\\\(int\\\)' \\\[-Wincompatible-pointer-types\\\]" } */
+    {
+      int *p3 = &p2; /* { dg-error "initialization of 'int \\\*' from incompatible pointer type 'int \\\*\\\*' \\\[-Wincompatible-pointer-types\\\]" } */
+      p3 = &p2; /* { dg-error "assignment to 'int \\\*' from incompatible pointer type 'int \\\*\\\*' \\\[-Wincompatible-pointer-types\\\]" } */
+    }
+    f4 (&p2); /* { dg-error "passing argument 1 of 'f4' from incompatible pointer type \\\[-Wincompatible-pointer-types\\\]" } */
+  }
+  if (flag)
+    return __builtin_abs; /* { dg-error "returning pointer to '__builtin_abs' of type 'int \\\(\\\*\\\)\\\(int\\\)' from a function with incompatible type 'int \\\*' \\\[-Wincompatible-pointer-types\\\]" } */
+  else
+    return incompatible_pointer_types; /* { dg-error "returning 'int \\\* \\\(\\\*\\\)\\\(int\\\)' from a function with incompatible return type 'int \\\*' \\\[-Wincompatible-pointer-types\\\]" } */
+}
+
+void
+return_mismatch_1 (void)
+{
+  return 0; /* { dg-error "'return' with a value, in function returning void \\\[-Wreturn-mismatch\\\]" } */
+}
+
+int
+return_mismatch_2 (void)
+{
+  return; /* { dg-bogus "-Wreturn-mismatch" } */
+}
diff --git a/gcc/testsuite/gcc.dg/permerror-gnu89.c b/gcc/testsuite/gcc.dg/permerror-gnu89.c
new file mode 100644
index 00000000000..66f7789269f
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/permerror-gnu89.c
@@ -0,0 +1,85 @@
+/* { dg-options "-std=gnu89" } */
+
+/* Overview test for C permerrors.  This test should be kept in sync with the
+   other permerror-* tests.  If new permerrors are added, test cases should be
+   added to this and the other files.  */
+
+void
+implicit_function_declaration (void)
+{
+  f1 (); /* { dg-bogus "-Wimplicit-function-declaration" } */
+}
+
+extern implicit_int_1; /* { dg-bogus "-Wimplicit-int" } */
+typedef implicit_int_2; /* { dg-bogus "-Wimplicit-int" } */
+extern implicit_int_3 (void); /* { dg-bogus "-Wimplicit-int" } */
+implicit_int_4 (i) /* { dg-bogus "-Wimplicit-int" } */
+/* Directive here in the other files.  */
+{
+  (const) 0; /* { dg-bogus "-Wimplicit-int" } */
+}
+
+extern int missing_parameter_type (i); /* { dg-warning "parameter names \\\(without types\\\) in function declaration\n" } */
+
+
+int *
+int_conversion_1 (int flag)
+{
+  void f2 (int *);
+  flag ? "1" : 1; /* { dg-warning "pointer/integer type mismatch in conditional expression \\\[-Wint-conversion\\\]" } */
+  flag ? 1 : "1"; /* { dg-warning "pointer/integer type mismatch in conditional expression \\\[-Wint-conversion\\\]" } */
+  f2 (flag); /* { dg-warning "passing argument 1 of 'f2' makes pointer from integer without a cast \\\[-Wint-conversion\\\]" } */
+  {
+    int i1 = &flag; /* { dg-warning "initialization of 'int' from 'int \\\*' makes integer from pointer without a cast \\\[-Wint-conversion\\\]" } */
+    i1 = &flag; /* { dg-warning "assignment to 'int' from 'int \\\*' makes integer from pointer without a cast \\\[-Wint-conversion\\\]" } */
+  }
+  return flag; /* { dg-warning "returning 'int' from a function with return type 'int \\\*' makes pointer from integer without a cast \\\[-Wint-conversion\\\]" } */
+}
+
+int
+int_conversion_2 (int flag)
+{
+  void f3 (int);
+  f3 (&flag); /* { dg-warning "passing argument 1 of 'f3' makes integer from pointer without a cast \\\[-Wint-conversion\\\]" } */
+  {
+    int *i1 = flag; /* { dg-warning "initialization of 'int \\\*' from 'int' makes pointer from integer without a cast \\\[-Wint-conversion\\\]" } */
+    i1 = flag; /* { dg-warning "assignment to 'int \\\*' from 'int' makes pointer from integer without a cast \\\[-Wint-conversion\\\]" } */
+  }
+  return &flag; /* { dg-warning "returning 'int \\\*' from a function with return type 'int' makes integer from pointer without a cast \\\[-Wint-conversion\\\]" } */
+}
+
+int *
+incompatible_pointer_types (int flag)
+{
+  void f4 (int *);
+  flag ? __builtin_abs : __builtin_labs; /* { dg-warning "pointer type mismatch in conditional expression \\\[-Wincompatible-pointer-types\\\]" } */
+  {
+    int *p1 = __builtin_abs; /* { dg-warning "initialization of 'int \\\*' from pointer to '__builtin_abs' with incompatible type 'int \\\(\\\*\\\)\\\(int\\\)' \\\[-Wincompatible-pointer-types\\\]" } */
+    p1 = __builtin_abs; /* { dg-warning "assignment to 'int \\\*' from pointer to '__builtin_abs' with incompatible type 'int \\\(\\\*\\\)\\\(int\\\)' \\\[-Wincompatible-pointer-types\\\]" } */
+  }
+  {
+    int *p2 = incompatible_pointer_types; /* { dg-warning "initialization of 'int \\\*' from incompatible pointer type 'int \\\* \\\(\\\*\\\)\\\(int\\\)' \\\[-Wincompatible-pointer-types\\\]" } */
+    p2 = incompatible_pointer_types; /* { dg-warning "assignment to 'int \\\*' from incompatible pointer type 'int \\\* \\\(\\\*\\\)\\\(int\\\)' \\\[-Wincompatible-pointer-types\\\]" } */
+    {
+      int *p3 = &p2; /* { dg-warning "initialization of 'int \\\*' from incompatible pointer type 'int \\\*\\\*' \\\[-Wincompatible-pointer-types\\\]" } */
+      p3 = &p2; /* { dg-warning "assignment to 'int \\\*' from incompatible pointer type 'int \\\*\\\*' \\\[-Wincompatible-pointer-types\\\]" } */
+    }
+    f4 (&p2); /* { dg-warning "passing argument 1 of 'f4' from incompatible pointer type \\\[-Wincompatible-pointer-types\\\]" } */
+  }
+  if (flag)
+    return __builtin_abs; /* { dg-warning "returning pointer to '__builtin_abs' of type 'int \\\(\\\*\\\)\\\(int\\\)' from a function with incompatible type 'int \\\*' \\\[-Wincompatible-pointer-types\\\]" } */
+  else
+    return incompatible_pointer_types; /* { dg-warning "returning 'int \\\* \\\(\\\*\\\)\\\(int\\\)' from a function with incompatible return type 'int \\\*' \\\[-Wincompatible-pointer-types\\\]" } */
+}
+
+void
+return_mismatch_1 (void)
+{
+  return 0; /* { dg-warning "'return' with a value, in function returning void \\\[-Wreturn-mismatch\\\]" } */
+}
+
+int
+return_mismatch_2 (void)
+{
+  return; /* { dg-bogus "-Wreturn-mismatch" } */
+}
diff --git a/gcc/testsuite/gcc.dg/permerror-noerror.c b/gcc/testsuite/gcc.dg/permerror-noerror.c
new file mode 100644
index 00000000000..cd1c2013cb5
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/permerror-noerror.c
@@ -0,0 +1,85 @@
+/* { dg-options "-Wno-error=implicit-function-declaration -Wno-error=implicit-int -Wno-error=int-conversion -Wno-error=incompatible-pointer-types -Wno-error=return-mismatch" } */
+
+/* This test should emulate the effect of -fpermissive by adding all the
+   -Wno-error= options that are implied by -fpermissive.  It needs to be
+   kept in sync with the other permerror-* tests.  */
+
+void
+implicit_function_declaration (void)
+{
+  f1 (); /* { dg-warning "'f1' \\\[-Wimplicit-function-declaration\\\]" } */
+}
+
+extern implicit_int_1; /* { dg-warning "'implicit_int_1' \\\[-Wimplicit-int\\\]" } */
+typedef implicit_int_2; /* { dg-warning "'implicit_int_2' \\\[-Wimplicit-int\\\]" } */
+extern implicit_int_3 (void); /* { dg-warning "'implicit_int_3' \\\[-Wimplicit-int\\]" } */
+implicit_int_4 (i) /* { dg-warning "return type defaults to 'int' \\\[-Wimplicit-int\\\]" } */
+/* { dg-warning "type of 'i' defaults to 'int' \\\[-Wimplicit-int\\\]" "" { target *-*-*} .-1 } */
+{
+  (const) 0; /* { dg-warning "type defaults to 'int' in type name \\\[-Wimplicit-int\\\]" } */
+}
+
+extern int missing_parameter_type (i); /* { dg-warning "parameter names \\\(without types\\\) in function declaration\n" } */
+
+
+int *
+int_conversion_1 (int flag)
+{
+  void f2 (int *);
+  flag ? "1" : 1; /* { dg-warning "pointer/integer type mismatch in conditional expression \\\[-Wint-conversion\\\]" } */
+  flag ? 1 : "1"; /* { dg-warning "pointer/integer type mismatch in conditional expression \\\[-Wint-conversion\\\]" } */
+  f2 (flag); /* { dg-warning "passing argument 1 of 'f2' makes pointer from integer without a cast \\\[-Wint-conversion\\\]" } */
+  {
+    int i1 = &flag; /* { dg-warning "initialization of 'int' from 'int \\\*' makes integer from pointer without a cast \\\[-Wint-conversion\\\]" } */
+    i1 = &flag; /* { dg-warning "assignment to 'int' from 'int \\\*' makes integer from pointer without a cast \\\[-Wint-conversion\\\]" } */
+  }
+  return flag; /* { dg-warning "returning 'int' from a function with return type 'int \\\*' makes pointer from integer without a cast \\\[-Wint-conversion\\\]" } */
+}
+
+int
+int_conversion_2 (int flag)
+{
+  void f3 (int);
+  f3 (&flag); /* { dg-warning "passing argument 1 of 'f3' makes integer from pointer without a cast \\\[-Wint-conversion\\\]" } */
+  {
+    int *i1 = flag; /* { dg-warning "initialization of 'int \\\*' from 'int' makes pointer from integer without a cast \\\[-Wint-conversion\\\]" } */
+    i1 = flag; /* { dg-warning "assignment to 'int \\\*' from 'int' makes pointer from integer without a cast \\\[-Wint-conversion\\\]" } */
+  }
+  return &flag; /* { dg-warning "returning 'int \\\*' from a function with return type 'int' makes integer from pointer without a cast \\\[-Wint-conversion\\\]" } */
+}
+
+int *
+incompatible_pointer_types (int flag)
+{
+  void f4 (int *);
+  flag ? __builtin_abs : __builtin_labs; /* { dg-warning "pointer type mismatch in conditional expression \\\[-Wincompatible-pointer-types\\\]" } */
+  {
+    int *p1 = __builtin_abs; /* { dg-warning "initialization of 'int \\\*' from pointer to '__builtin_abs' with incompatible type 'int \\\(\\\*\\\)\\\(int\\\)' \\\[-Wincompatible-pointer-types\\\]" } */
+    p1 = __builtin_abs; /* { dg-warning "assignment to 'int \\\*' from pointer to '__builtin_abs' with incompatible type 'int \\\(\\\*\\\)\\\(int\\\)' \\\[-Wincompatible-pointer-types\\\]" } */
+  }
+  {
+    int *p2 = incompatible_pointer_types; /* { dg-warning "initialization of 'int \\\*' from incompatible pointer type 'int \\\* \\\(\\\*\\\)\\\(int\\\)' \\\[-Wincompatible-pointer-types\\\]" } */
+    p2 = incompatible_pointer_types; /* { dg-warning "assignment to 'int \\\*' from incompatible pointer type 'int \\\* \\\(\\\*\\\)\\\(int\\\)' \\\[-Wincompatible-pointer-types\\\]" } */
+    {
+      int *p3 = &p2; /* { dg-warning "initialization of 'int \\\*' from incompatible pointer type 'int \\\*\\\*' \\\[-Wincompatible-pointer-types\\\]" } */
+      p3 = &p2; /* { dg-warning "assignment to 'int \\\*' from incompatible pointer type 'int \\\*\\\*' \\\[-Wincompatible-pointer-types\\\]" } */
+    }
+    f4 (&p2); /* { dg-warning "passing argument 1 of 'f4' from incompatible pointer type \\\[-Wincompatible-pointer-types\\\]" } */
+  }
+  if (flag)
+    return __builtin_abs; /* { dg-warning "returning pointer to '__builtin_abs' of type 'int \\\(\\\*\\\)\\\(int\\\)' from a function with incompatible type 'int \\\*' \\\[-Wincompatible-pointer-types\\\]" } */
+  else
+    return incompatible_pointer_types; /* { dg-warning "returning 'int \\\* \\\(\\\*\\\)\\\(int\\\)' from a function with incompatible return type 'int \\\*' \\\[-Wincompatible-pointer-types\\\]" } */
+}
+
+void
+return_mismatch_1 (void)
+{
+  return 0; /* { dg-warning "'return' with a value, in function returning void \\\[-Wreturn-mismatch\\\]" } */
+}
+
+int
+return_mismatch_2 (void)
+{
+  return; /* { dg-warning "return' with no value, in function returning non-void \\\[-Wreturn-mismatch\\\]" } */
+}
diff --git a/gcc/testsuite/gcc.dg/permerror-pedantic.c b/gcc/testsuite/gcc.dg/permerror-pedantic.c
new file mode 100644
index 00000000000..852e7daa38d
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/permerror-pedantic.c
@@ -0,0 +1,85 @@
+/* { dg-options "-pedantic-errors" } */
+
+/* Overview test for C permerrors.  This test should be kept in sync with the
+   other permerror-* tests.  If new permerrors are added, test cases should be
+   added to this and the other files.  */
+
+void
+implicit_function_declaration (void)
+{
+  f1 (); /* { dg-error "'f1' \\\[-Wimplicit-function-declaration\\\]" } */
+}
+
+extern implicit_int_1; /* { dg-error "'implicit_int_1' \\\[-Wimplicit-int\\\]" } */
+typedef implicit_int_2; /* { dg-error "'implicit_int_2' \\\[-Wimplicit-int\\\]" } */
+extern implicit_int_3 (void); /* { dg-error "'implicit_int_3' \\\[-Wimplicit-int\\]" } */
+implicit_int_4 (i) /* { dg-error "return type defaults to 'int' \\\[-Wimplicit-int\\\]" } */
+/* { dg-error "type of 'i' defaults to 'int' \\\[-Wimplicit-int\\\]" "" { target *-*-*} .-1 } */
+{
+  (const) 0; /* { dg-error "type defaults to 'int' in type name \\\[-Wimplicit-int\\\]" } */
+}
+
+extern int missing_parameter_type (i); /* { dg-error "parameter names \\\(without types\\\) in function declaration\n" } */
+
+
+int *
+int_conversion_1 (int flag)
+{
+  void f2 (int *);
+  flag ? "1" : 1; /* { dg-error "pointer/integer type mismatch in conditional expression \\\[-Wint-conversion\\\]" } */
+  flag ? 1 : "1"; /* { dg-error "pointer/integer type mismatch in conditional expression \\\[-Wint-conversion\\\]" } */
+  f2 (flag); /* { dg-error "passing argument 1 of 'f2' makes pointer from integer without a cast \\\[-Wint-conversion\\\]" } */
+  {
+    int i1 = &flag; /* { dg-error "initialization of 'int' from 'int \\\*' makes integer from pointer without a cast \\\[-Wint-conversion\\\]" } */
+    i1 = &flag; /* { dg-error "assignment to 'int' from 'int \\\*' makes integer from pointer without a cast \\\[-Wint-conversion\\\]" } */
+  }
+  return flag; /* { dg-error "returning 'int' from a function with return type 'int \\\*' makes pointer from integer without a cast \\\[-Wint-conversion\\\]" } */
+}
+
+int
+int_conversion_2 (int flag)
+{
+  void f3 (int);
+  f3 (&flag); /* { dg-error "passing argument 1 of 'f3' makes integer from pointer without a cast \\\[-Wint-conversion\\\]" } */
+  {
+    int *i1 = flag; /* { dg-error "initialization of 'int \\\*' from 'int' makes pointer from integer without a cast \\\[-Wint-conversion\\\]" } */
+    i1 = flag; /* { dg-error "assignment to 'int \\\*' from 'int' makes pointer from integer without a cast \\\[-Wint-conversion\\\]" } */
+  }
+  return &flag; /* { dg-error "returning 'int \\\*' from a function with return type 'int' makes integer from pointer without a cast \\\[-Wint-conversion\\\]" } */
+}
+
+int *
+incompatible_pointer_types (int flag)
+{
+  void f4 (int *);
+  flag ? __builtin_abs : __builtin_labs; /* { dg-warning "pointer type mismatch in conditional expression \\\[-Wincompatible-pointer-types\\\]" } */
+  {
+    int *p1 = __builtin_abs; /* { dg-error "initialization of 'int \\\*' from pointer to '__builtin_abs' with incompatible type 'int \\\(\\\*\\\)\\\(int\\\)' \\\[-Wincompatible-pointer-types\\\]" } */
+    p1 = __builtin_abs; /* { dg-error "assignment to 'int \\\*' from pointer to '__builtin_abs' with incompatible type 'int \\\(\\\*\\\)\\\(int\\\)' \\\[-Wincompatible-pointer-types\\\]" } */
+  }
+  {
+    int *p2 = incompatible_pointer_types; /* { dg-error "initialization of 'int \\\*' from incompatible pointer type 'int \\\* \\\(\\\*\\\)\\\(int\\\)' \\\[-Wincompatible-pointer-types\\\]" } */
+    p2 = incompatible_pointer_types; /* { dg-error "assignment to 'int \\\*' from incompatible pointer type 'int \\\* \\\(\\\*\\\)\\\(int\\\)' \\\[-Wincompatible-pointer-types\\\]" } */
+    {
+      int *p3 = &p2; /* { dg-error "initialization of 'int \\\*' from incompatible pointer type 'int \\\*\\\*' \\\[-Wincompatible-pointer-types\\\]" } */
+      p3 = &p2; /* { dg-error "assignment to 'int \\\*' from incompatible pointer type 'int \\\*\\\*' \\\[-Wincompatible-pointer-types\\\]" } */
+    }
+    f4 (&p2); /* { dg-error "passing argument 1 of 'f4' from incompatible pointer type \\\[-Wincompatible-pointer-types\\\]" } */
+  }
+  if (flag)
+    return __builtin_abs; /* { dg-error "returning pointer to '__builtin_abs' of type 'int \\\(\\\*\\\)\\\(int\\\)' from a function with incompatible type 'int \\\*' \\\[-Wincompatible-pointer-types\\\]" } */
+  else
+    return incompatible_pointer_types; /* { dg-error "returning 'int \\\* \\\(\\\*\\\)\\\(int\\\)' from a function with incompatible return type 'int \\\*' \\\[-Wincompatible-pointer-types\\\]" } */
+}
+
+void
+return_mismatch_1 (void)
+{
+  return 0; /* { dg-error "'return' with a value, in function returning void \\\[-Wreturn-mismatch\\\]" } */
+}
+
+int
+return_mismatch_2 (void)
+{
+  return; /* { dg-error "return' with no value, in function returning non-void \\\[-Wreturn-mismatch\\\]" } */
+}
diff --git a/gcc/testsuite/gcc.dg/permerror-system.c b/gcc/testsuite/gcc.dg/permerror-system.c
new file mode 100644
index 00000000000..e6a978e494d
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/permerror-system.c
@@ -0,0 +1,9 @@
+/* { dg-options "-isystem ${srcdir}" } */
+
+/* Test that permerrors appear in system headers.  */
+
+/* The dg-* directives in the header file are ignored.  No warnings are
+   expected.  */
+#include <gcc.dg/permerror-default.c>
+
+/* These errors come from permerror-default.c.  No errors yet.  */
-- 
2.41.0