From 222e2a7620e6520ffaf4fc4e69d79c18da31542e Mon Sep 17 00:00:00 2001
From: "Zancanaro; Carlo" <czan8762@plang3.cs.usyd.edu.au>
Date: Mon, 24 Sep 2012 09:58:17 +1000
Subject: Add the clang library to the repo (with some of my changes, too).

---
 .../Headers/TestFramework.h                        |  1 +
 clang/test/Frontend/Inputs/lit.local.cfg           |  1 +
 clang/test/Frontend/Inputs/test.h                  |  1 +
 clang/test/Frontend/Inputs/test2.h                 |  1 +
 clang/test/Frontend/Inputs/test3.h                 |  1 +
 clang/test/Frontend/Weverything.c                  |  9 ++++++++
 clang/test/Frontend/Wno-everything.c               |  7 ++++++
 clang/test/Frontend/ast-codegen.c                  | 12 ++++++++++
 clang/test/Frontend/ast-main.c                     |  8 +++++++
 clang/test/Frontend/cpp-output.c                   | 14 +++++++++++
 clang/test/Frontend/darwin-version.c               | 25 ++++++++++++++++++++
 clang/test/Frontend/dependency-gen.c               | 27 ++++++++++++++++++++++
 clang/test/Frontend/dependency-generation-crash.c  |  4 ++++
 clang/test/Frontend/diagnostics-option-names.c     |  8 +++++++
 clang/test/Frontend/iframework.c                   |  3 +++
 clang/test/Frontend/ir-support-codegen.ll          |  9 ++++++++
 clang/test/Frontend/ir-support-errors.ll           |  8 +++++++
 clang/test/Frontend/lit.local.cfg                  |  1 +
 clang/test/Frontend/macros.c                       |  4 ++++
 clang/test/Frontend/output-failures.c              |  4 ++++
 .../preprocessed-output-macro-first-token.c        |  5 ++++
 clang/test/Frontend/print-header-includes.c        |  8 +++++++
 clang/test/Frontend/rewrite-macros.c               | 17 ++++++++++++++
 clang/test/Frontend/stdin.c                        |  3 +++
 clang/test/Frontend/undef.c                        |  4 ++++
 clang/test/Frontend/unknown-pragmas.c              |  4 ++++
 clang/test/Frontend/warning-mapping-1.c            |  6 +++++
 clang/test/Frontend/warning-mapping-2.c            |  5 ++++
 clang/test/Frontend/warning-mapping-3.c            | 10 ++++++++
 clang/test/Frontend/warning-mapping-4.c            |  6 +++++
 clang/test/Frontend/warning-mapping-5.c            |  9 ++++++++
 31 files changed, 225 insertions(+)
 create mode 100644 clang/test/Frontend/Inputs/TestFramework.framework/Headers/TestFramework.h
 create mode 100644 clang/test/Frontend/Inputs/lit.local.cfg
 create mode 100644 clang/test/Frontend/Inputs/test.h
 create mode 100644 clang/test/Frontend/Inputs/test2.h
 create mode 100644 clang/test/Frontend/Inputs/test3.h
 create mode 100644 clang/test/Frontend/Weverything.c
 create mode 100644 clang/test/Frontend/Wno-everything.c
 create mode 100644 clang/test/Frontend/ast-codegen.c
 create mode 100644 clang/test/Frontend/ast-main.c
 create mode 100644 clang/test/Frontend/cpp-output.c
 create mode 100644 clang/test/Frontend/darwin-version.c
 create mode 100644 clang/test/Frontend/dependency-gen.c
 create mode 100644 clang/test/Frontend/dependency-generation-crash.c
 create mode 100644 clang/test/Frontend/diagnostics-option-names.c
 create mode 100644 clang/test/Frontend/iframework.c
 create mode 100644 clang/test/Frontend/ir-support-codegen.ll
 create mode 100644 clang/test/Frontend/ir-support-errors.ll
 create mode 100644 clang/test/Frontend/lit.local.cfg
 create mode 100644 clang/test/Frontend/macros.c
 create mode 100644 clang/test/Frontend/output-failures.c
 create mode 100644 clang/test/Frontend/preprocessed-output-macro-first-token.c
 create mode 100644 clang/test/Frontend/print-header-includes.c
 create mode 100644 clang/test/Frontend/rewrite-macros.c
 create mode 100644 clang/test/Frontend/stdin.c
 create mode 100644 clang/test/Frontend/undef.c
 create mode 100644 clang/test/Frontend/unknown-pragmas.c
 create mode 100644 clang/test/Frontend/warning-mapping-1.c
 create mode 100644 clang/test/Frontend/warning-mapping-2.c
 create mode 100644 clang/test/Frontend/warning-mapping-3.c
 create mode 100644 clang/test/Frontend/warning-mapping-4.c
 create mode 100644 clang/test/Frontend/warning-mapping-5.c

(limited to 'clang/test/Frontend')

diff --git a/clang/test/Frontend/Inputs/TestFramework.framework/Headers/TestFramework.h b/clang/test/Frontend/Inputs/TestFramework.framework/Headers/TestFramework.h
new file mode 100644
index 0000000..49048ca
--- /dev/null
+++ b/clang/test/Frontend/Inputs/TestFramework.framework/Headers/TestFramework.h
@@ -0,0 +1 @@
+static int f0(void) {}
diff --git a/clang/test/Frontend/Inputs/lit.local.cfg b/clang/test/Frontend/Inputs/lit.local.cfg
new file mode 100644
index 0000000..e6f55ee
--- /dev/null
+++ b/clang/test/Frontend/Inputs/lit.local.cfg
@@ -0,0 +1 @@
+config.suffixes = []
diff --git a/clang/test/Frontend/Inputs/test.h b/clang/test/Frontend/Inputs/test.h
new file mode 100644
index 0000000..98cc459
--- /dev/null
+++ b/clang/test/Frontend/Inputs/test.h
@@ -0,0 +1 @@
+#include "test2.h"
diff --git a/clang/test/Frontend/Inputs/test2.h b/clang/test/Frontend/Inputs/test2.h
new file mode 100644
index 0000000..6d1a0d4
--- /dev/null
+++ b/clang/test/Frontend/Inputs/test2.h
@@ -0,0 +1 @@
+int x;
diff --git a/clang/test/Frontend/Inputs/test3.h b/clang/test/Frontend/Inputs/test3.h
new file mode 100644
index 0000000..92ff4b8
--- /dev/null
+++ b/clang/test/Frontend/Inputs/test3.h
@@ -0,0 +1 @@
+int y;
diff --git a/clang/test/Frontend/Weverything.c b/clang/test/Frontend/Weverything.c
new file mode 100644
index 0000000..32f3147
--- /dev/null
+++ b/clang/test/Frontend/Weverything.c
@@ -0,0 +1,9 @@
+// Regression check that -pedantic-errors doesn't cause other diagnostics to
+// become errors.
+//
+// RUN: %clang_cc1 -verify -Weverything -pedantic-errors %s
+
+int f0(int, unsigned);
+int f0(int x, unsigned y) {
+  return x < y; // expected-warning {{comparison of integers}}
+}
diff --git a/clang/test/Frontend/Wno-everything.c b/clang/test/Frontend/Wno-everything.c
new file mode 100644
index 0000000..ca70ca4
--- /dev/null
+++ b/clang/test/Frontend/Wno-everything.c
@@ -0,0 +1,7 @@
+// RUN: %clang_cc1 -verify -Wno-everything -Wsign-compare %s
+
+int f0(int, unsigned);
+int f0(int x, unsigned y) {
+  if (x=3);
+  return x < y; // expected-warning {{comparison of integers}}
+}
diff --git a/clang/test/Frontend/ast-codegen.c b/clang/test/Frontend/ast-codegen.c
new file mode 100644
index 0000000..b5b2157
--- /dev/null
+++ b/clang/test/Frontend/ast-codegen.c
@@ -0,0 +1,12 @@
+// RUN: %clang -emit-ast -o %t.ast %s
+// RUN: %clang -emit-llvm -S -o - %t.ast | FileCheck %s
+
+// CHECK: module asm "foo"
+__asm__("foo");
+
+// CHECK: @g0 = common global i32 0, align 4
+int g0;
+
+// CHECK: define i32 @f0()
+int f0() {
+}
diff --git a/clang/test/Frontend/ast-main.c b/clang/test/Frontend/ast-main.c
new file mode 100644
index 0000000..43237a1
--- /dev/null
+++ b/clang/test/Frontend/ast-main.c
@@ -0,0 +1,8 @@
+// RUN: %clang -emit-llvm -S -o %t1.ll -x c - < %s
+// RUN: %clang -emit-ast -o %t.ast %s
+// RUN: %clang -emit-llvm -S -o %t2.ll -x ast - < %t.ast
+// RUN: diff %t1.ll %t2.ll
+
+int main() {
+  return 0;
+}
diff --git a/clang/test/Frontend/cpp-output.c b/clang/test/Frontend/cpp-output.c
new file mode 100644
index 0000000..e44095b
--- /dev/null
+++ b/clang/test/Frontend/cpp-output.c
@@ -0,0 +1,14 @@
+// RUN: %clang -E -o %t -C %s
+// RUN: grep '^int x; // comment' %t
+// RUN: grep '^x x' %t
+// RUN: %clang -E -o %t -CC %s
+// RUN: grep '^int x; // comment' %t
+// RUN: grep '^x /\* comment \*/ x /\* comment \*/' %t
+
+int x; // comment
+
+#define A(foo, bar) foo bar
+#define B x // comment 
+
+A(B, B)
+
diff --git a/clang/test/Frontend/darwin-version.c b/clang/test/Frontend/darwin-version.c
new file mode 100644
index 0000000..f9ce54b
--- /dev/null
+++ b/clang/test/Frontend/darwin-version.c
@@ -0,0 +1,25 @@
+// RUN: %clang -target armv6-apple-darwin9 -dM -E -o %t %s
+// RUN: grep '__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__' %t | count 0
+// RUN: grep '__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__' %t | grep '1050' | count 1
+// RUN: %clang -target armv6-apple-darwin9 -miphoneos-version-min=3.0 -dM -E -o %t %s
+// RUN: grep '__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__' %t | grep '30000' | count 1
+// RUN: grep '__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__' %t | count 0
+// RUN: %clang -target armv6-apple-darwin9 -miphoneos-version-min=2.0 -dM -E -o %t %s
+// RUN: grep '__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__' %t | grep '20000' | count 1
+// RUN: grep '__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__' %t | count 0
+// RUN: %clang -target armv6-apple-darwin9 -miphoneos-version-min=2.2 -dM -E -o %t %s
+// RUN: grep '__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__' %t | grep '20200' | count 1
+// RUN: %clang -target i686-apple-darwin8 -dM -E -o %t %s
+// RUN: grep '__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__' %t | count 0
+// RUN: grep '__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__' %t | grep '1040' | count 1
+// RUN: %clang -target i686-apple-darwin9 -dM -E -o %t %s
+// RUN: grep '__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__' %t | grep '1050' | count 1
+// RUN: %clang -target i686-apple-darwin10 -dM -E -o %t %s
+// RUN: grep '__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__' %t | grep '1060' | count 1
+// RUN: %clang -target i686-apple-darwin9 -mmacosx-version-min=10.4 -dM -E -o %t %s
+// RUN: grep '__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__' %t | count 0
+// RUN: grep '__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__' %t | grep '1040' | count 1
+// RUN: %clang -target i686-apple-darwin9 -mmacosx-version-min=10.5 -dM -E -o %t %s
+// RUN: grep '__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__' %t | grep '1050' | count 1
+// RUN: %clang -target i686-apple-darwin9 -mmacosx-version-min=10.6 -dM -E -o %t %s
+// RUN: grep '__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__' %t | grep '1060' | count 1
diff --git a/clang/test/Frontend/dependency-gen.c b/clang/test/Frontend/dependency-gen.c
new file mode 100644
index 0000000..5883ec5
--- /dev/null
+++ b/clang/test/Frontend/dependency-gen.c
@@ -0,0 +1,27 @@
+// REQUIRES: shell
+// Basic test
+// RUN: rm -rf %t.dir
+// RUN: mkdir -p %t.dir/a/b
+// RUN: echo > %t.dir/a/b/x.h
+// RUN: cd %t.dir
+// RUN: %clang -MD -MF - %s -fsyntax-only -I a/b | FileCheck -check-prefix=CHECK-ONE %s
+// CHECK-ONE: {{ }}a/b{{[/\\]}}x.h
+
+// PR8974 (-include flag)
+// RUN: %clang -MD -MF - %s -fsyntax-only -include a/b/x.h -DINCLUDE_FLAG_TEST | FileCheck -check-prefix=CHECK-TWO %s
+// CHECK-TWO: {{ }}a/b/x.h
+
+// rdar://problem/9734352 (paths involving ".")
+// RUN: %clang -MD -MF - %s -fsyntax-only -I ./a/b | FileCheck -check-prefix=CHECK-THREE %s
+// CHECK-THREE: {{ }}a/b{{[/\\]}}x.h
+// RUN: %clang -MD -MF - %s -fsyntax-only -I .//./a/b/ | FileCheck -check-prefix=CHECK-FOUR %s
+// CHECK-FOUR: {{ }}a/b{{[/\\]}}x.h
+// RUN: %clang -MD -MF - %s -fsyntax-only -I a/b/. | FileCheck -check-prefix=CHECK-FIVE %s
+// CHECK-FIVE: {{ }}a/b/.{{[/\\]}}x.h
+// RUN: cd a/b
+// RUN: %clang -MD -MF - %s -fsyntax-only -I ./ | FileCheck -check-prefix=CHECK-SIX %s
+// CHECK-SIX: {{ }}x.h
+
+#ifndef INCLUDE_FLAG_TEST
+#include <x.h>
+#endif
diff --git a/clang/test/Frontend/dependency-generation-crash.c b/clang/test/Frontend/dependency-generation-crash.c
new file mode 100644
index 0000000..181bb71
--- /dev/null
+++ b/clang/test/Frontend/dependency-generation-crash.c
@@ -0,0 +1,4 @@
+// RUN: touch %t
+// RUN: chmod 0 %t
+// %clang -E -dependency-file bla -MT %t -MP -o %t -x c /dev/null
+// rdar://9286457
diff --git a/clang/test/Frontend/diagnostics-option-names.c b/clang/test/Frontend/diagnostics-option-names.c
new file mode 100644
index 0000000..ed0d2ed
--- /dev/null
+++ b/clang/test/Frontend/diagnostics-option-names.c
@@ -0,0 +1,8 @@
+// RUN: not %clang_cc1 -fdiagnostics-show-option -Werror -Weverything %s 2> %t
+// RUN: FileCheck < %t %s
+
+int f0(int, unsigned);
+int f0(int x, unsigned y) {
+// CHECK: comparison of integers of different signs{{.*}} [-Werror,-Wsign-compare]
+  return x < y; // expected-error {{ : 'int' and 'unsigned int'  }}
+}
diff --git a/clang/test/Frontend/iframework.c b/clang/test/Frontend/iframework.c
new file mode 100644
index 0000000..0c241fd
--- /dev/null
+++ b/clang/test/Frontend/iframework.c
@@ -0,0 +1,3 @@
+// RUN: %clang -fsyntax-only -iframework%S/Inputs %s -Xclang -verify
+
+#include <TestFramework/TestFramework.h>
diff --git a/clang/test/Frontend/ir-support-codegen.ll b/clang/test/Frontend/ir-support-codegen.ll
new file mode 100644
index 0000000..e5e5b62
--- /dev/null
+++ b/clang/test/Frontend/ir-support-codegen.ll
@@ -0,0 +1,9 @@
+; REQUIRES: x86-64-registered-target
+; RUN: %clang_cc1 -S -o - %s | FileCheck %s
+
+target triple = "x86_64-apple-darwin10"
+
+; CHECK: .globl _f0
+define i32 @f0() nounwind ssp {
+       ret i32 0
+}
diff --git a/clang/test/Frontend/ir-support-errors.ll b/clang/test/Frontend/ir-support-errors.ll
new file mode 100644
index 0000000..cb5913c
--- /dev/null
+++ b/clang/test/Frontend/ir-support-errors.ll
@@ -0,0 +1,8 @@
+; RUN: %clang_cc1 -S -o - %s 2>&1 | FileCheck %s
+
+target triple = "x86_64-apple-darwin10"
+
+define i32 @f0() nounwind ssp {
+; CHECK: {{.*}}ir-support-errors.ll:7:16: error: use of undefined value '%x'
+       ret i32 %x
+}
diff --git a/clang/test/Frontend/lit.local.cfg b/clang/test/Frontend/lit.local.cfg
new file mode 100644
index 0000000..4c13598
--- /dev/null
+++ b/clang/test/Frontend/lit.local.cfg
@@ -0,0 +1 @@
+config.suffixes = ['.c', '.cpp', '.m', '.mm', '.ll', '.bc']
diff --git a/clang/test/Frontend/macros.c b/clang/test/Frontend/macros.c
new file mode 100644
index 0000000..3170797
--- /dev/null
+++ b/clang/test/Frontend/macros.c
@@ -0,0 +1,4 @@
+// RUN: %clang_cc1 -DA= -DB=1 -verify -fsyntax-only %s
+
+int a[(B A) == 1 ? 1 : -1];
+
diff --git a/clang/test/Frontend/output-failures.c b/clang/test/Frontend/output-failures.c
new file mode 100644
index 0000000..e2af7c7
--- /dev/null
+++ b/clang/test/Frontend/output-failures.c
@@ -0,0 +1,4 @@
+// RUN: not %clang_cc1 -emit-llvm -o %S/doesnotexist/somename %s 2> %t
+// RUN: FileCheck -check-prefix=OUTPUTFAIL -input-file=%t %s
+
+// OUTPUTFAIL: Error opening output file '{{.*}}doesnotexist{{.*}}'
diff --git a/clang/test/Frontend/preprocessed-output-macro-first-token.c b/clang/test/Frontend/preprocessed-output-macro-first-token.c
new file mode 100644
index 0000000..06b78c2
--- /dev/null
+++ b/clang/test/Frontend/preprocessed-output-macro-first-token.c
@@ -0,0 +1,5 @@
+// This is the first thing other than comments and preprocessor stuff in the
+// file.
+//
+// RUN: %clang_cc1 -fms-extensions -E %s
+#pragma comment(lib, "somelib")
diff --git a/clang/test/Frontend/print-header-includes.c b/clang/test/Frontend/print-header-includes.c
new file mode 100644
index 0000000..7773d20
--- /dev/null
+++ b/clang/test/Frontend/print-header-includes.c
@@ -0,0 +1,8 @@
+// RUN: %clang_cc1 -include Inputs/test3.h -E -H -o %t.out %s 2> %t.err
+// RUN: FileCheck < %t.err %s
+
+// CHECK-NOT: test3.h
+// CHECK: . {{.*test.h}}
+// CHECK: .. {{.*test2.h}}
+
+#include "Inputs/test.h"
diff --git a/clang/test/Frontend/rewrite-macros.c b/clang/test/Frontend/rewrite-macros.c
new file mode 100644
index 0000000..bc74796
--- /dev/null
+++ b/clang/test/Frontend/rewrite-macros.c
@@ -0,0 +1,17 @@
+// RUN: %clang_cc1 -verify -rewrite-macros -o %t %s
+
+#define A(a,b) a ## b
+
+// RUN: grep '12 */\*A\*/ /\*(1,2)\*/' %t
+A(1,2)
+
+// RUN: grep '/\*_Pragma("mark")\*/' %t
+_Pragma("mark")
+
+// RUN: grep "//#warning eek" %t
+/* expected-warning {{eek}} */ #warning eek
+
+// RUN: grep "//#pragma mark mark" %t
+#pragma mark mark
+
+
diff --git a/clang/test/Frontend/stdin.c b/clang/test/Frontend/stdin.c
new file mode 100644
index 0000000..2d0a237
--- /dev/null
+++ b/clang/test/Frontend/stdin.c
@@ -0,0 +1,3 @@
+// RUN: %clang_cc1 -E - < /dev/null > %t
+// RUN: grep '<built-in>' %t
+ 
diff --git a/clang/test/Frontend/undef.c b/clang/test/Frontend/undef.c
new file mode 100644
index 0000000..f539cdc
--- /dev/null
+++ b/clang/test/Frontend/undef.c
@@ -0,0 +1,4 @@
+// RUN: %clang -undef -x assembler-with-cpp -E %s
+#ifndef __ASSEMBLER__
+#error "Must be preprocessed as assembler."
+#endif
diff --git a/clang/test/Frontend/unknown-pragmas.c b/clang/test/Frontend/unknown-pragmas.c
new file mode 100644
index 0000000..53a5a45
--- /dev/null
+++ b/clang/test/Frontend/unknown-pragmas.c
@@ -0,0 +1,4 @@
+// RUN: %clang_cc1 -Eonly -Wall -verify %s
+// RUN: %clang_cc1 -E -dM -Wall -verify %s
+
+#pragma adgohweopihweotnwet
diff --git a/clang/test/Frontend/warning-mapping-1.c b/clang/test/Frontend/warning-mapping-1.c
new file mode 100644
index 0000000..883dafb
--- /dev/null
+++ b/clang/test/Frontend/warning-mapping-1.c
@@ -0,0 +1,6 @@
+// Check that -w has higher priority than -Werror.
+// RUN: %clang_cc1 -verify -Wsign-compare -Werror -w %s
+
+int f0(int x, unsigned y) {
+  return x < y;
+}
diff --git a/clang/test/Frontend/warning-mapping-2.c b/clang/test/Frontend/warning-mapping-2.c
new file mode 100644
index 0000000..39ba499
--- /dev/null
+++ b/clang/test/Frontend/warning-mapping-2.c
@@ -0,0 +1,5 @@
+// Check that -w has lower priority than -pedantic-errors.
+// RUN: %clang_cc1 -verify -pedantic-errors -w %s
+
+void f0() { f1(); } // expected-error {{implicit declaration of function}}
+
diff --git a/clang/test/Frontend/warning-mapping-3.c b/clang/test/Frontend/warning-mapping-3.c
new file mode 100644
index 0000000..8c70190
--- /dev/null
+++ b/clang/test/Frontend/warning-mapping-3.c
@@ -0,0 +1,10 @@
+// Check that -Werror and -Wfatal-error interact properly.
+//
+// Verify mode doesn't work with fatal errors, just use FileCheck here.
+//
+// RUN: not %clang_cc1 -Wunused-function -Werror -Wfatal-errors %s 2> %t.err
+// RUN: FileCheck < %t.err %s
+// CHECK: fatal error: unused function
+// CHECK: 1 error generated
+
+static void f0(void) {} // expected-fatal {{unused function}}
diff --git a/clang/test/Frontend/warning-mapping-4.c b/clang/test/Frontend/warning-mapping-4.c
new file mode 100644
index 0000000..d8d2769
--- /dev/null
+++ b/clang/test/Frontend/warning-mapping-4.c
@@ -0,0 +1,6 @@
+// RUN: %clang_cc1 -verify -Wno-error=sign-compare %s
+// RUN: %clang_cc1 -verify -Wsign-compare -w -Wno-error=sign-compare %s
+
+int f0(int x, unsigned y) {
+  return x < y;
+}
diff --git a/clang/test/Frontend/warning-mapping-5.c b/clang/test/Frontend/warning-mapping-5.c
new file mode 100644
index 0000000..27d53dc
--- /dev/null
+++ b/clang/test/Frontend/warning-mapping-5.c
@@ -0,0 +1,9 @@
+// Check that #pragma diagnostic warning overrides -Werror. This matches GCC's
+// original documentation, but not its earlier implementations.
+// 
+// RUN: %clang_cc1 -verify -Werror %s
+
+#pragma clang diagnostic warning "-Wsign-compare"
+int f0(int x, unsigned y) {
+  return x < y; // expected-warning {{comparison of integers}}
+}
-- 
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