[mb] Config for ClangToTLinuxASanLibfuzzer

build/config/compiler/BUILD.gn

 # Copyright (c) 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/android/config.gni")
 import("//build/config/chrome_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/nacl/config.gni")
 import("//build/toolchain/cc_wrapper.gni")
 import("//build/toolchain/toolchain.gni")
@@ skipping 1332 matching lines @@
 
 # Same config as 'optimize' but without the WPO flag.
 config("optimize_no_wpo") {
   if (is_win) {
     # Favor size over speed, /O1 must be before the common flags. The GYP
     # build also specifies /Os and /GF but these are implied by /O1.
     cflags = [ "/O1" ] + common_optimize_on_cflags + [ "/Oi" ]
   } else if (optimize_for_size) {
     # Favor size over speed.
     cflags = [ "-Os" ] + common_optimize_on_cflags
+  } else if (optimize_for_fuzzing) {
+    cflags = [ "-O1" ] + common_optimize_on_cflags
   } else {
     cflags = [ "-O2" ] + common_optimize_on_cflags
   }
   ldflags = common_optimize_on_ldflags
 }
 
 # Turn off optimizations.
 config("no_optimize") {
   if (is_win) {
     cflags = [
@@ skipping 93 matching lines @@
           # value of C4702 for PGO builds is likely very small.
           "/wd4702",
         ]
       }
     } else {
       cflags = [ "-O3" ] + common_optimize_on_cflags
     }
   }
 }
 
+config("optimize_fuzzing") {
+  if (is_nacl_irt) {
+    # The NaCl IRT is a special case and always wants its own config.
+    # Various components do:
+    #   if (!is_debug) {
+    #     configs -= [ "//build/config/compiler:default_optimization" ]
+    #     configs += [ "//build/config/compiler:optimize_max" ]
+    #   }
+    # So this config has to have the selection logic just like
+    # "default_optimization", below.
+    configs = [ "//build/config/nacl:irt_optimize" ]
+  } else {
+    # Only supported on non-Windows.
+    assert(!is_win)
+    cflags = [ "-O1" ] + common_optimize_on_cflags
+    ldflags = common_optimize_on_ldflags
+  }
+}
+
 # The default optimization applied to all targets. This will be equivalent to
 # either "optimize" or "no_optimize", depending on the build flags.
 config("default_optimization") {
   if (is_nacl_irt) {
     # The NaCl IRT is a special case and always wants its own config.
     # It gets optimized the same way regardless of the type of build.
     configs = [ "//build/config/nacl:irt_optimize" ]
   } else if (is_debug) {
     configs = [ ":no_optimize" ]
+  } else if (optimize_for_fuzzing) {
+    configs = [ ":optimize_fuzzing" ]
   } else {
     configs = [ ":optimize" ]
   }
 }
 
 # Symbols ----------------------------------------------------------------------
 
 # The BUILDCONFIG file sets the "default_symbols" config on targets by
 # default. It will be equivalent to one the three specific symbol levels.
 #
@@ skipping 103 matching lines @@
 
 if (is_ios || is_mac) {
   # On Mac and iOS, this enables support for ARC (automatic ref-counting).
   # See http://clang.llvm.org/docs/AutomaticReferenceCounting.html.
   config("enable_arc") {
     common_flags = [ "-fobjc-arc" ]
     cflags_objc = common_flags
     cflags_objcc = common_flags
   }
 }