[Reland] Stop using -std=gnu*

This reland includes a patch that fixes the AFL build with CFLAGS="-std=c11
-D_GNU_SOURCE".

BUG=427584
TBR=thakis,sbc

Change-Id: I9c3c52f4898a9ae1efc377802671ac44b79e9381
Reviewed-on: https://chromium-review.googlesource.com/1180170
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Jonathan Metzman <metzman@chromium.org>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584284}

build/config/compiler/BUILD.gn

@@ -550,16 +550,22 @@ config("compiler") {
       cxx11_override = use_cxx11
     }
 
-    # gnu11/gnu++11 instead of c11/c++11 is needed because some code uses typeof()
-    # (a GNU extension).
-    # TODO(thakis): Eventually switch this to c++11 instead,
-    # http://crbug.com/427584
-    cflags_c += [ "-std=gnu11" ]
+    # Since we build with -std=c* and not -std=gnu*, _GNU_SOURCE will not be
+    # defined by the compiler.  However, lots of code relies on the non-standard
+    # features that _GNU_SOURCE enables, so define it manually.
+    defines += [ "_GNU_SOURCE" ]
+
+    cflags_c += [ "-std=c11" ]
     if (cxx11_override) {
       # Override Chromium's default for projects that wish to stay on C++11.
-      cflags_cc += [ "-std=gnu++11" ]
+      cflags_cc += [ "-std=c++11" ]
     } else {
-      cflags_cc += [ "-std=gnu++14" ]
+      cflags_cc += [ "-std=c++14" ]
+    }
+    if (is_nacl) {
+      # Undefine __STRICT_ANSI__ to get non-standard features which would
+      # otherwise not be enabled by NaCl's sysroots.
+      cflags += [ "-U__STRICT_ANSI__" ]
     }
   } else if (!is_win && !is_nacl) {
     if (target_os == "android") {

native_client_sdk/src/libraries/nacl_io/kernel_wrap_glibc.cc

@@ -82,7 +82,7 @@ EXTERN_C_BEGIN
 #define WRAP(name) __nacl_irt_##name##_wrap
 
 // Declare REAL function pointer.
-#define DECLARE_REAL_PTR(name) typeof(__nacl_irt_##name) REAL(name);
+#define DECLARE_REAL_PTR(name) __typeof__(__nacl_irt_##name) REAL(name);
 
 // Assign the REAL function pointer.
 #define ASSIGN_REAL_PTR(name)        \
@@ -90,10 +90,12 @@ EXTERN_C_BEGIN
   REAL(name) = __nacl_irt_##name;
 
 // Switch IRT's pointer to the REAL pointer
-#define USE_REAL(name) __nacl_irt_##name = (typeof(__nacl_irt_##name))REAL(name)
+#define USE_REAL(name) \
+  __nacl_irt_##name = (__typeof__(__nacl_irt_##name))REAL(name)
 
 // Switch IRT's pointer to the WRAP function
-#define USE_WRAP(name) __nacl_irt_##name = (typeof(__nacl_irt_##name))WRAP(name)
+#define USE_WRAP(name) \
+  __nacl_irt_##name = (__typeof__(__nacl_irt_##name))WRAP(name)
 
 #define EXPAND_SYMBOL_LIST_OPERATION(OP) \
   OP(chdir);                             \

native_client_sdk/src/libraries/nacl_io/kernel_wrap_newlib.cc

@@ -32,18 +32,18 @@ EXTERN_C_BEGIN
 
 // Declare REAL function pointer.
 #define DECLARE_REAL_PTR(group, name) \
-  typeof(__libnacl_irt_##group.name) REAL(name);
+  __typeof__(__libnacl_irt_##group.name) REAL(name);
 
 // Assign the REAL function pointer.
 #define ASSIGN_REAL_PTR(group, name) REAL(name) = __libnacl_irt_##group.name;
 
 // Switch IRT's pointer to the REAL pointer
 #define USE_REAL(group, name) \
-  __libnacl_irt_##group.name = (typeof(REAL(name)))REAL(name);
+  __libnacl_irt_##group.name = (__typeof__(REAL(name)))REAL(name);
 
 // Switch the IRT's pointer to the WRAP function
 #define USE_WRAP(group, name) \
-  __libnacl_irt_##group.name = (typeof(REAL(name)))WRAP(name);
+  __libnacl_irt_##group.name = (__typeof__(REAL(name)))WRAP(name);
 
 extern void __libnacl_irt_dev_filename_init(void);
 extern void __libnacl_irt_dev_fdio_init(void);

third_party/afl/README.chromium

@@ -2,7 +2,7 @@ Name: American Fuzzy Lop
 Short Name: AFL
 URL: http://lcamtuf.coredump.cx/afl/
 Version: 2.52b
-Date: December 13, 2017
+Date: August 17, 2018
 License: Apache 2.0
 License File: src/docs/COPYING
 Security Critical: no
@@ -20,3 +20,5 @@ Local Modifications:
   - src/testcases/others/elf
   - src/llvm_mode/afl-llvm-pass.so.cc
   - src/dictionaries/
+- patches/0001-fix-build-with-std-c11.patch
+  - Fix build with CFLAGS="-std=c11 -D_GNU_SOURCE"

third_party/afl/patches/0001-fix-build-with-std-c11.patch

@@ -0,0 +1,27 @@
+diff --git a/afl-fuzz.c b/afl-fuzz.c
+index 01b4afef0ecc..f0d564a33037 100644
+--- a/afl-fuzz.c
++++ b/afl-fuzz.c
+@@ -23,7 +23,9 @@
+ #define AFL_MAIN
+ #define MESSAGES_TO_STDOUT
+ 
++#ifndef _GNU_SOURCE
+ #define _GNU_SOURCE
++#endif
+ #define _FILE_OFFSET_BITS 64
+ 
+ #include "config.h"
+diff --git a/types.h b/types.h
+index 784d3a7a286d..d24d1fdd97e8 100644
+--- a/types.h
++++ b/types.h
+@@ -78,7 +78,7 @@ typedef int64_t  s64;
+ #define STRINGIFY(x) STRINGIFY_INTERNAL(x)
+ 
+ #define MEM_BARRIER() \
+-  asm volatile("" ::: "memory")
++  __asm__ volatile("" ::: "memory")
+ 
+ #define likely(_x)   __builtin_expect(!!(_x), 1)
+ #define unlikely(_x)  __builtin_expect(!!(_x), 0)

third_party/afl/src/afl-fuzz.c

@@ -23,7 +23,9 @@
 #define AFL_MAIN
 #define MESSAGES_TO_STDOUT
 
+#ifndef _GNU_SOURCE
 #define _GNU_SOURCE
+#endif
 #define _FILE_OFFSET_BITS 64
 
 #include "config.h"

third_party/afl/src/types.h

@@ -78,7 +78,7 @@ typedef int64_t  s64;
 #define STRINGIFY(x) STRINGIFY_INTERNAL(x)
 
 #define MEM_BARRIER() \
-  asm volatile("" ::: "memory")
+  __asm__ volatile("" ::: "memory")
 
 #define likely(_x)   __builtin_expect(!!(_x), 1)
 #define unlikely(_x)  __builtin_expect(!!(_x), 0)

third_party/afl/update.py

@@ -11,6 +11,7 @@ import cStringIO
 import datetime
 import os
 import re
+import subprocess
 import sys
 import tarfile
 import urllib2
@@ -127,6 +128,16 @@ def version_to_float(version):
   return float(version)
 
 
+def apply_patches():
+  afl_dir = os.path.join('third_party', 'afl')
+  patch_dir = os.path.join(afl_dir, 'patches')
+  src_dir = os.path.join(afl_dir, 'src')
+  for patch_file in os.listdir(patch_dir):
+    subprocess.check_output(
+        ['patch', '-i',
+         os.path.join('..', 'patches', patch_file)], cwd=src_dir)
+
+
 def update_afl(new_version):
   """
   Update this version of AFL to newer version, new_version.
@@ -142,14 +153,10 @@ def update_afl(new_version):
   # Extract the tarball.
   tarball = AflTarball(new_version)
   tarball.download()
-  current_less_than_new = version_to_float(old_version) < version_to_float(
-      tarball.real_version)
-  assert current_less_than_new, (
-      'Trying to update from version {0} to {1}'.format(old_version,
-                                                        tarball.real_version))
-
   tarball.extract()
 
+  apply_patches()
+
   readme.update(tarball.real_version)
 
 

third_party/libdrm/BUILD.gn

@@ -15,8 +15,10 @@ declare_args() {
 
 if (!use_system_libdrm) {
   config("libdrm_config") {
-    # Define _GNU_SOURCE for vasprintf use in xf86drm.c
-    defines = [ "_GNU_SOURCE" ]
+    # TODO(thomasanderson): Remove this hack once
+    # https://patchwork.kernel.org/patch/10545295/ lands.
+    defines = [ "typeof(x)=__typeof__(x)" ]
+
     include_dirs = [
       "src",
       "src/include",

third_party/wayland/BUILD.gn

@@ -16,6 +16,10 @@ if (!use_system_libwayland) {
       "include/protocol",
       "src/src",
     ]
+
+    # TODO(thomasanderson): Remove this once
+    # https://patchwork.freedesktop.org/patch/242086/ lands.
+    cflags = [ "-Wno-macro-redefined" ]
   }
 
   static_library("wayland_util") {