wrapper:

* improve and colorize warning/error/debug/info messages
* add include path warnings for /usr/include and /usr/local/include
other changes:
* bump version to 0.10

CHANGELOG

@@ -1,3 +1,14 @@
+/****************************** v0.10 ********************************/
+
+changed:
+* improved and colorized wrapper error/warning/debug/info messages
+
+added:
+* include path warnings for /usr/include and /usr/local/include
+  (can be switched off via 'OSXCROSS_NO_INCLUDE_PATH_WARNINGS=1')
+* an option to silence osxcross extension warnings
+  (OSXCROSS_NO_EXTENSION_WARNINGS=1)
+
 /******************************* v0.9 *******************************/
 
 changed:

build.sh

@@ -77,7 +77,7 @@ if [ -z "$OSX_VERSION_MIN" ]; then
 fi
 
 # Don't change this
-OSXCROSS_VERSION=0.9
+OSXCROSS_VERSION=0.10
 
 TARBALL_DIR=$BASE_DIR/tarballs
 BUILD_DIR=$BASE_DIR/build

wrapper/build.sh

@@ -75,8 +75,8 @@ if [ -n "$BWPLATFORM" ]; then
     #CXX=o32-g++
     FLAGS+="-fvisibility-inlines-hidden "
   elif [ $PLATFORM = "FreeBSD" -a $(uname -s) != "FreeBSD" ]; then
-    CXX=amd64-pc-freebsd10.0-clang++
-    #CXX=amd64-pc-freebsd10.0-g++
+    CXX=amd64-pc-freebsd10.1-clang++
+    #CXX=amd64-pc-freebsd10.1-g++
   elif [ $PLATFORM = "NetBSD" -a $(uname -s) != "NetBSD" ]; then
     CXX=amd64-pc-netbsd6.1.3-clang++
     #CXX=amd64-pc-netbsd6.1.3-g++

wrapper/main.cpp

@@ -54,10 +54,70 @@ namespace {
 //  detect target and setup invocation command
 //
 
+void checkIncludePath(const char *opt, const char *path) {
+#ifndef __APPLE__
+  constexpr const char *DangerousIncludePaths[] = { "/usr/include",
+                                                    "/usr/local/include" };
+  if (!path)
+    return;
+
+  static bool noinccheck = !!getenv("OSXCROSS_NO_INCLUDE_PATH_WARNINGS");
+
+  if (noinccheck)
+    return;
+
+  char buf[PATH_MAX + 1];
+  const char *rpath = realpath(path, buf);
+
+  if (!rpath)
+    rpath = path;
+
+  for (const char *dpath : DangerousIncludePaths) {
+    if (!strncmp(rpath, dpath, strlen(dpath))) {
+      warn << "possible dangerous include path specified: '" << opt << " "
+           << path << "'";
+
+      if (strcmp(path, rpath))
+        warn << " (" << rpath << ")";
+
+      warn << warn.endl();
+
+      warninfo << "you can silence this warning via "
+               << "'OSXCROSS_NO_INCLUDE_PATH_WARNINGS=1' (env)"
+               << warninfo.endl();
+    }
+  }
+#else
+  (void)opt;
+  (void)path;
+#endif
+}
+
+void warnExtension(const char *extension) {
+  static bool noextwarnings = !!getenv("OSXCROSS_NO_EXTENSION_WARNINGS");
+  if (noextwarnings)
+    return;
+  warn << extension << " is an osxcross extension" << warn.endl();
+  warninfo << "you can silence this warning via "
+           << "'OSXCROSS_NO_EXTENSION_WARNINGS=1' (env)" << warninfo.endl();
+}
+
 #define PABREAK                                                                \
   else target.args.push_back(arg);                                             \
   break
 
+#define PAPUSHARG                                                              \
+  target.args.push_back(arg);                                                  \
+  break
+
+#define PAPUSHARGANDVAL(splitted)                                              \
+  do {                                                                         \
+    target.args.push_back(arg);                                                \
+    if (splitted && i < argc)                                                  \
+      target.args.push_back(argv[i]);                                          \
+  } while (0);                                                                 \
+  break
+
 bool detectTarget(int argc, char **argv, Target &target) {
   const char *cmd = argv[0];
   const char *p = strrchr(cmd, '/');
@@ -69,15 +129,18 @@ bool detectTarget(int argc, char **argv, Target &target) {
 
   target.args.reserve(static_cast<size_t>(argc));
 
-  auto warnExtension = [](const char *extension) {
-    std::cerr << "warning: '" << extension << "' is an OSXCross extension"
-              << std::endl;
-  };
-
   auto parseArgs = [&]()->bool {
     typedef bool (*delayedfun)(Target &);
     std::vector<delayedfun> delayedfuncs;
 
+    auto runLater = [&](delayedfun fun) {
+      for (auto dfun : delayedfuncs) {
+        if (dfun == fun)
+          return;
+      }
+      delayedfuncs.push_back(fun);
+    };
+
     auto getVal = [&](char * arg, const char * flag, int & i)->const char * {
       const char *val = arg + strlen(flag);
 
@@ -85,7 +148,7 @@ bool detectTarget(int argc, char **argv, Target &target) {
         val = argv[++i];
 
         if (i >= argc) {
-          std::cerr << "missing argument for '" << flag << "'" << std::endl;
+          err << "missing argument for '" << flag << "'" << err.endl();
           return nullptr;
         }
       }
@@ -93,6 +156,14 @@ bool detectTarget(int argc, char **argv, Target &target) {
       return val;
     };
 
+    auto installGCCArchExtensionWarning = [&]() {
+      runLater([](Target &t) {
+        if (t.targetarch.size() > 1 && t.isGCC())
+          warnExtension("using multiple '-arch' flags with gcc");
+        return true;
+      });
+    };
+
     if (char *p = getenv("MACOSX_DEPLOYMENT_TARGET")) {
       target.OSNum = parseOSVersion(p);
       unsetenv("MACOSX_DEPLOYMENT_TARGET");
@@ -115,18 +186,18 @@ bool detectTarget(int argc, char **argv, Target &target) {
             Arch arch = parseArch(val);
 
             if (arch == Arch::unknown) {
-              std::cerr << "warning: '-arch': unknown architecture '" << val
-                        << "'" << std::endl;
+              warn << "'-arch': unknown architecture '" << val << "'"
+                   << warn.endl();
             }
 
             const char *name = getArchName(arch);
 
-            if (strcmp(val, name)) {
-              std::cerr << "warning: '-arch': " << val << " != " << name
-                        << std::endl;
-            }
+            if (strcmp(val, name))
+              warn << "'-arch': '" << val << "' != '" << name << "'"
+                   << warn.endl();
 
             target.addArch(arch);
+            installGCCArchExtensionWarning();
           }
 
           PABREAK;
@@ -137,10 +208,10 @@ bool detectTarget(int argc, char **argv, Target &target) {
           if (!strcmp(arg, "-E")) {
             target.nocodegen = true;
 
-            delayedfuncs.push_back([](Target &t) {
+            runLater([](Target &t) {
               if (t.targetarch.size() > 1) {
-                std::cerr << "cannot use '-E' with multiple -arch options"
-                          << std::endl;
+                err << "cannot use '-E' with multiple -arch options"
+                    << err.endl();
                 return false;
               }
               return true;
@@ -160,10 +231,10 @@ bool detectTarget(int argc, char **argv, Target &target) {
             if (target.isClang())
               continue;
 
-            delayedfuncs.push_back([](Target &t) {
+            runLater([](Target &t) {
               if (t.targetarch.size() > 1) {
-                std::cerr << "gcc does not support '-flto' with multiple "
-                          << "-arch flags" << std::endl;
+                err << "gcc does not support '-flto' with multiple "
+                    << "'-arch' flags" << err.endl();
                 return false;
               }
               return true;
@@ -172,6 +243,30 @@ bool detectTarget(int argc, char **argv, Target &target) {
 
           PABREAK;
         }
+        case 'c':
+        case 'i':
+        case 'I': {
+          // c
+          // i
+          // I
+
+          constexpr const char *OptsToCheck[] = {
+            "-isystem", "-icxx-isystem", "-cxx-isystem", "-I"
+          };
+
+          bool splitted = false;
+
+          for (const char *opt : OptsToCheck) {
+            if (!strncmp(arg, opt, strlen(opt))) {
+              int iold = i;
+              checkIncludePath(opt, getVal(arg, opt, i));
+              splitted = i > iold;
+              break;
+            }
+          }
+
+          PAPUSHARGANDVAL(splitted);
+        }
         case 'm': {
           // -m
 
@@ -180,17 +275,18 @@ bool detectTarget(int argc, char **argv, Target &target) {
             target.OSNum = parseOSVersion(val);
 
             if (target.OSNum != val) {
-              std::cerr << "warning: '-mmacosx-version-min=' ("
-                        << target.OSNum.Str() << " != " << val << ")"
-                        << std::endl;
+              warn << "'-mmacosx-version-min=' (" << target.OSNum.Str()
+                   << " != " << val << ")" << warn.endl();
             }
           } else if (!strcmp(arg, "-m16") || !strcmp(arg, "-mx32")) {
-            std::cerr << "'" << arg << "' not supported" << std::endl;
+            err << "'" << arg << "' is not supported" << err.endl();
             return false;
           } else if (!strcmp(arg, "-m32")) {
             target.addArch(Arch::i386);
+            installGCCArchExtensionWarning();
           } else if (!strcmp(arg, "-m64")) {
             target.addArch(Arch::x86_64);
+            installGCCArchExtensionWarning();
           }
 
           PABREAK;
@@ -200,8 +296,7 @@ bool detectTarget(int argc, char **argv, Target &target) {
 
           if (!strcmp(arg, "-oc-use-gcc-libs")) {
             if (target.isGCC()) {
-              std::cerr << "warning: '" << arg << "' has no effect"
-                        << std::endl;
+              warn << arg << "' has no effect" << warn.endl();
               break;
             }
             target.stdlib = StdLib::libstdcxx;
@@ -219,8 +314,12 @@ bool detectTarget(int argc, char **argv, Target &target) {
             const char *val = arg + 8;
             size_t i = 0;
 
-            if (target.isGCC())
-              warnExtension("-stdlib=");
+            if (target.isGCC()) {
+              runLater([](Target &) {
+                warnExtension("'-stdlib='");
+                return true;
+              });
+            }
 
             for (auto stdlibname : StdLibNames) {
               if (!strcmp(val, stdlibname)) {
@@ -231,18 +330,17 @@ bool detectTarget(int argc, char **argv, Target &target) {
             }
 
             if (i == (sizeof(StdLibNames) / sizeof(StdLibNames[0]))) {
-              std::cerr << "value of '-stdlib=' must be ";
+              err << "value of '-stdlib=' must be ";
 
               for (size_t j = 0; j < i; ++j) {
-                std::cerr << "'" << StdLibNames[j] << "'";
-                if (j == i - 2) {
-                  std::cerr << " or ";
-                } else if (j < i - 2) {
-                  std::cerr << ", ";
-                }
+                err << "'" << StdLibNames[j] << "'";
+                if (j == i - 2)
+                  err << " or ";
+                else if (j < i - 2)
+                  err << ", ";
               }
 
-              std::cerr << std::endl;
+              err << err.endl();
               return false;
             }
 
@@ -254,9 +352,8 @@ bool detectTarget(int argc, char **argv, Target &target) {
           PABREAK;
         }
         case 'x': {
-          if (!strncmp(arg, "-x", 2)) {
+          if (!strncmp(arg, "-x", 2))
             target.lang = getVal(arg, "-x", i);
-          }
 
           PABREAK;
         }
@@ -311,8 +408,8 @@ bool detectTarget(int argc, char **argv, Target &target) {
 
     if (target.compiler.rfind("-libc++") == (target.compiler.size() - 7)) {
       if (target.stdlib != StdLib::unset && target.stdlib != StdLib::libcxx) {
-        std::cerr << "warning: '-stdlib=" << getStdLibString(target.stdlib)
-                  << "' will be ignored" << std::endl;
+        warn << "'-stdlib=" << getStdLibString(target.stdlib)
+             << "' will be ignored" << warn.endl();
       }
 
       target.compiler.resize(target.compiler.size() - 7);
@@ -359,8 +456,8 @@ bool detectTarget(int argc, char **argv, Target &target) {
         (*prog)(argc, argv, target);
 
       if (target.target != getDefaultTarget()) {
-        std::cerr << "warning: target mismatch (" << target.target
-                  << " != " << getDefaultTarget() << ")" << std::endl;
+        warn << "target mismatch (" << target.target
+             << " != " << getDefaultTarget() << ")" << warn.endl();
       }
 
       if (!parseArgs())
@@ -396,8 +493,8 @@ bool detectTarget(int argc, char **argv, Target &target) {
 //  and clang + -oc-use-gcc-libs
 //
 
-void generateMultiArchObjectFile(int &rc, int argc, char **argv,
-                                 Target &target, int debug) {
+void generateMultiArchObjectFile(int &rc, int argc, char **argv, Target &target,
+                                 int debug) {
 #ifndef _WIN32
   std::string stdintmpfile;
   string_vector objs;
@@ -469,10 +566,8 @@ void generateMultiArchObjectFile(int &rc, int argc, char **argv,
 
       target.outputname = outputname.c_str() + pos;
     } else {
-      if (f) {
-        std::cerr << "source filename detection failed" << std::endl;
-        std::cerr << "using a.out" << std::endl;
-      }
+      if (f)
+        warn << "source filename detection failed (using a.out)" << warn.endl();
       target.outputname = "a.out";
     }
   }
@@ -499,7 +594,7 @@ void generateMultiArchObjectFile(int &rc, int argc, char **argv,
       int status = 1;
 
       if (wait(&status) == -1) {
-        std::cerr << "wait() failed" << std::endl;
+        err << "wait() failed" << err.endl();
         cleanup();
         rc = 1;
         break;
@@ -558,15 +653,14 @@ void generateMultiArchObjectFile(int &rc, int argc, char **argv,
       }
 
       if (debug) {
-        std::cerr << "[d] "
-                  << "[" << num << "/" << target.targetarch.size()
-                  << "] [compiling] " << archname << std::endl;
+        dbg << "[" << num << "/" << target.targetarch.size() << "] [compiling] "
+            << archname << dbg.endl();
       }
 
       compile = true;
       break;
     } else {
-      std::cerr << "fork() failed" << std::endl;
+      err << "fork() failed" << err.endl();
       rc = 1;
       break;
     }
@@ -585,7 +679,7 @@ void generateMultiArchObjectFile(int &rc, int argc, char **argv,
       lipo = "lipo";
 
       if (getPathOfCommand(lipo.c_str(), path).empty()) {
-        std::cerr << "cannot find lipo binary" << std::endl;
+        err << "cannot find lipo binary" << err.endl();
         rc = 1;
       }
     }
@@ -604,9 +698,8 @@ void generateMultiArchObjectFile(int &rc, int argc, char **argv,
       cmd += "-output ";
       cmd += target.outputname;
 
-      if (debug) {
-        std::cerr << "[d] [lipo] <-- " << cmd << std::endl;
-      }
+      if (debug)
+        dbg << "[lipo] <-- " << cmd << dbg.endl();
 
       rc = system(cmd.c_str());
       rc = WEXITSTATUS(rc);
@@ -621,7 +714,7 @@ void generateMultiArchObjectFile(int &rc, int argc, char **argv,
   (void)argv;
   (void)target;
   (void)debug;
-  std::cerr << __func__ << " not supported" << std::endl;
+  err << __func__ << " not supported" << err.endl();
   rc = 1;
 #endif
 }
@@ -641,31 +734,28 @@ int main(int argc, char **argv) {
   int rc = -1;
 
   if (!detectTarget(argc, argv, target)) {
-    std::cerr << "cannot detect target" << std::endl;
+    err << "while detecting target" << err.endl();
     return 1;
   }
 
-  if (char *p = getenv("OCDEBUG")) {
+  if (char *p = getenv("OCDEBUG"))
     debug = ((*p >= '1' && *p <= '9') ? *p - '0' + 0 : 0);
-  }
 
   if (debug) {
     b->halt();
 
     if (debug >= 2) {
-      std::cerr << "[d] detected target triple: " << target.getTriple()
-                << std::endl;
-      std::cerr << "[d] detected compiler: " << target.compiler << std::endl;
+      dbg << "detected target triple: " << target.getTriple() << dbg.endl();
+      dbg << "detected compiler: " << target.compiler << dbg.endl();
 
-      std::cerr << "[d] detected stdlib: " << getStdLibString(target.stdlib)
-                << std::endl;
+      dbg << "detected stdlib: " << getStdLibString(target.stdlib)
+          << dbg.endl();
 
       if (debug >= 3) {
-        std::cerr << "[d] detected source file: "
-                  << (target.sourcefile ? target.sourcefile : "-") << std::endl;
+        dbg << "detected source file: "
+            << (target.sourcefile ? target.sourcefile : "-") << dbg.endl();
 
-        std::cerr << "[d] detected language: " << target.getLangName()
-                  << std::endl;
+        dbg << "detected language: " << target.getLangName() << dbg.endl();
       }
 
       b->resume();
@@ -696,8 +786,8 @@ int main(int argc, char **argv) {
       out += " ";
     }
 
-    std::cerr << "[d] --> " << in << std::endl;
-    std::cerr << "[d] <-- " << out << std::endl;
+    dbg << "--> " << in << dbg.endl();
+    dbg << "<-- " << out << dbg.endl();
   };
 
   if (rc == -1) {
@@ -719,12 +809,12 @@ int main(int argc, char **argv) {
     if (rc == -1)
       printCommand();
 
-    std::cerr << "[d] === time spent in wrapper: " << diff / 1000000.0 << " ms"
-              << std::endl;
+    dbg << "=== time spent in wrapper: " << diff / 1000000.0 << " ms"
+        << dbg.endl();
   }
 
   if (rc == -1 && execvp(cargs[0], cargs)) {
-    std::cerr << "invoking compiler failed" << std::endl;
+    err << "invoking compiler failed" << err.endl();
 
     if (!debug)
       printCommand();

wrapper/programs/osxcross-conf.cpp

@@ -28,12 +28,13 @@ namespace program {
 namespace osxcross {
 
 int conf(Target &target) {
-  std::string sdkpath;
+  std::string SDKPath;
   OSVersion OSXVersionMin = getDefaultMinTarget();
   const char *ltopath = getLibLTOPath();
 
-  if (!target.getSDKPath(sdkpath)) {
-    std::cerr << "cannot find Mac OS X SDK!" << std::endl;
+  if (!target.getSDKPath(SDKPath)) {
+    err << "cannot find Mac OS X SDK (expected in: " << SDKPath << ")"
+        << err.endl();
     return 1;
   }
 
@@ -47,10 +48,11 @@ int conf(Target &target) {
             << std::endl;
   std::cout << "export OSXCROSS_OSX_VERSION_MIN=" << OSXVersionMin.shortStr()
             << std::endl;
-  std::cout << "export OSXCROSS_TARGET=" << getDefaultTarget() << std::endl;
+  std::cout << "export OSXCROSS_TARGET=" << getDefaultTarget()
+            << std::endl;
   std::cout << "export OSXCROSS_SDK_VERSION=" << target.getSDKOSNum().shortStr()
             << std::endl;
-  std::cout << "export OSXCROSS_SDK=" << sdkpath
+  std::cout << "export OSXCROSS_SDK=" << SDKPath
             << std::endl;
   std::cout << "export OSXCROSS_TARBALL_DIR=" << target.execpath
             << "/../../tarballs"

wrapper/programs/osxcross-env.cpp

@@ -47,11 +47,13 @@ int env(int argc, char **argv) {
 
     do {
       auto badChar = [&](const char *p) {
-        std::cerr << desc << " should not contain '" << *p << "'" << std::endl;
+        err << desc << " should not contain '" << *p << "'" << warn.endl();
 
         const char *start = p - std::min<size_t>(p - pp, 30);
 
         size_t len = std::min<size_t>(strlen(start), 60);
+
+        std::cerr << std::endl;
         std::cerr << std::string(start, len) << std::endl;
 
         while (start++ != p)

wrapper/programs/pkg-config.cpp

@@ -93,7 +93,7 @@ int pkg_config(int argc, char **argv, Target &target) {
       setenv("PKG_CONFIG_LIBDIR", "", 1);
 
     if (execvp("pkg-config", argv))
-      std::cerr << "cannot find or execute pkg-config" << std::endl;
+      err << "cannot find or execute pkg-config" << err.endl();
   }
 
   return 1;

wrapper/target.cpp

@@ -358,8 +358,8 @@ void Target::setupGCCLibs(Arch arch) {
 
   getSDKPath(SDKPath);
 
-  GCCLibPath << SDKPath << "/../../lib/gcc/"
-             << otriple << "/" << gccversion.Str();
+  GCCLibPath << SDKPath << "/../../lib/gcc/" << otriple << "/"
+             << gccversion.Str();
 
   GCCLibSTDCXXPath << SDKPath << "/../../" << otriple << "/lib";
 
@@ -408,13 +408,12 @@ bool Target::setup() {
   std::string SDKPath;
   OSVersion SDKOSNum = getSDKOSNum();
 
-  if (!isKnownCompiler()) {
-    std::cerr << "warning: unknown compiler '" << compiler << "'" << std::endl;
-  }
+  if (!isKnownCompiler())
+    warn << "unknown compiler '" << compiler << "'" << warn.endl();
 
   if (!getSDKPath(SDKPath)) {
-    std::cerr << "cannot find Mac OS X SDK (expected in: " << SDKPath << ")"
-              << std::endl;
+    err << "cannot find Mac OS X SDK (expected in: " << SDKPath << ")"
+        << err.endl();
     return false;
   }
 
@@ -444,8 +443,8 @@ bool Target::setup() {
     if (haveArch(Arch::x86_64h)) {
       OSNum = OSVersion(10, 8); // Default to 10.8 for x86_64h
       if (SDKOSNum < OSNum) {
-        std::cerr << getArchName(arch) << " requires the SDK from "
-                  << OSNum.Str() << " (or later)" << std::endl;
+        err << "'" << getArchName(arch) << "' requires the SDK from "
+            << OSNum.Str() << " (or later)" << err.endl();
         return false;
       }
     } else if (stdlib == StdLib::libcxx) {
@@ -456,17 +455,17 @@ bool Target::setup() {
   }
 
   if (OSNum > SDKOSNum) {
-    std::cerr << "targeted OS X Version must be <= " << SDKOSNum.Str()
-              << " (SDK)" << std::endl;
+    err << "targeted OS X version must be <= " << SDKOSNum.Str() << " (SDK)"
+        << err.endl();
     return false;
   } else if (OSNum < OSVersion(10, 4)) {
-    std::cerr << "targeted OS X Version must be >= 10.4" << std::endl;
+    err << "targeted OS X version must be >= 10.4" << err.endl();
     return false;
   }
 
   if (haveArch(Arch::x86_64h) && OSNum < OSVersion(10, 8)) {
-    std::cerr << getArchName(Arch::x86_64h) << " requires "
-              << "'-mmacosx-version-min=10.8' (or later)" << std::endl;
+    err << "'" << getArchName(Arch::x86_64h) << "' requires "
+        << "'-mmacosx-version-min=10.8' (or later)" << err.endl();
     return false;
   }
 
@@ -478,13 +477,13 @@ bool Target::setup() {
     }
   } else if (stdlib == StdLib::libcxx) {
     if (!hasLibCXX()) {
-      std::cerr << "libc++ requires the SDK from 10.7 (or later)" << std::endl;
+      err << "libc++ requires the SDK from 10.7 (or later)" << err.endl();
       return false;
     }
 
     if (OSNum.Num() && OSNum < OSVersion(10, 7)) {
-      std::cerr << "libc++ requires '-mmacosx-version-min=10.7' (or later)"
-                << std::endl;
+      err << "libc++ requires '-mmacosx-version-min=10.7' (or later)"
+          << err.endl();
       return false;
     }
   }
@@ -504,8 +503,8 @@ bool Target::setup() {
   case StdLib::libcxx: {
     CXXHeaderPath += "/usr/include/c++/v1";
     if (!dirExists(CXXHeaderPath)) {
-      std::cerr << "cannot find " << getStdLibString(stdlib) << " headers"
-                << std::endl;
+      err << "cannot find " << getStdLibString(stdlib) << " headers"
+          << err.endl();
       return false;
     }
     break;
@@ -531,8 +530,8 @@ bool Target::setup() {
       });
 
       if (v.empty()) {
-        std::cerr << "'-oc-use-gcc-libs' requires gcc to be installed "
-                     "(./build_gcc.sh)" << std::endl;
+        err << "'-oc-use-gcc-libs' requires gcc to be installed "
+               "(./build_gcc.sh)" << err.endl();
         return false;
       }
 
@@ -559,8 +558,8 @@ bool Target::setup() {
     }
 
     if (!dirExists(CXXHeaderPath)) {
-      std::cerr << "cannot find " << getStdLibString(stdlib) << " headers"
-                << std::endl;
+      err << "cannot find " << getStdLibString(stdlib) << " headers"
+          << err.endl();
       return false;
     }
 
@@ -586,8 +585,8 @@ bool Target::setup() {
 
 #ifndef __APPLE__
     if (!findClangIntrinsicHeaders(tmp)) {
-      std::cerr << "cannot find clang intrinsic headers, please report this "
-                   "issue to the OSXCross project" << std::endl;
+      warn << "cannot find clang intrinsic headers, please report this "
+              "issue to the OSXCross project" << warn.endl();
     } else {
       fargs.push_back("-isystem");
       fargs.push_back(tmp);
@@ -620,10 +619,8 @@ bool Target::setup() {
     if (isLibCXX()) {
       if (!langStdGiven())
         langstd = "c++0x";
-      else if (!isCXX11orNewer()) {
-        std::cerr << "warning: libc++ requires -std=c++11 (or later) with gcc"
-                  << std::endl;
-      }
+      else if (!isCXX11orNewer())
+        warn << "libc++ requires -std=c++11 (or later) with gcc" << warn.endl();
     }
 
     if (isCXX() && isLibCXX()) {
@@ -720,7 +717,7 @@ bool Target::setup() {
         fargs.push_back(is32bit ? "-m32" : "-m64");
 
         if (arch == Arch::x86_64h) {
-          std::cerr << getArchName(arch) << " requires clang" << std::endl;
+          err << "'" << getArchName(arch) << "' requires clang" << err.endl();
           return false;
           // fargs.push_back("-march=core-avx2");
           // fargs.push_back("-Wl,-arch,x86_64h");
@@ -733,8 +730,8 @@ bool Target::setup() {
       }
       break;
     default:
-      std::cerr << "unsupported architecture " << getArchName(arch) << ""
-                << std::endl;
+      err << "unsupported architecture: '" << getArchName(arch) << "'"
+          << err.endl();
       return false;
     }
   }

wrapper/tools.cpp

@@ -31,11 +31,11 @@
 #include <cstring>
 #include <climits>
 #include <cassert>
-#include <unistd.h>
 #include <sys/time.h>
 #include <sys/stat.h>
 
 #ifndef _WIN32
+#include <unistd.h>
 #include <sys/types.h>
 #include <sys/wait.h>
 #include <dirent.h>
@@ -63,6 +63,30 @@
 
 namespace tools {
 
+//
+// Terminal text colors
+//
+
+bool isTerminal() {
+#ifndef _WIN32
+  static bool first = false;
+  static bool val;
+
+  if (!first) {
+    val = !!isatty(fileno(stderr));
+    first = true;
+  }
+
+  return val;
+#else
+  return false;
+#endif
+}
+
+//
+// Executable path
+//
+
 char *getExecutablePath(char *buf, size_t len) {
   char *p;
 #ifdef __APPLE__

wrapper/tools.h

@@ -33,6 +33,85 @@ static inline void clear(std::stringstream &sstr)
   sstr.str(std::string());
 }
 
+//
+// Terminal text colors
+//
+
+bool isTerminal();
+
+// http://stackoverflow.com/a/17469726
+
+enum ColorCode {
+  FG_DEFAULT = 39,
+  FG_BLACK = 30,
+  FG_RED = 31,
+  FG_GREEN = 32,
+  FG_YELLOW = 33,
+  FG_BLUE = 34,
+  FG_MAGENTA = 35,
+  FG_CYAN = 36,
+  FG_LIGHT_GRAY = 37,
+  FG_DARK_GRAY = 90,
+  FG_LIGHT_RED = 91,
+  FG_LIGHT_GREEN = 92,
+  FG_LIGHT_YELLOW = 93,
+  FG_LIGHT_BLUE = 94,
+  FG_LIGHT_MAGENTA = 95,
+  FG_LIGHT_CYAN = 96,
+  FG_WHITE = 97,
+  BG_RED = 41,
+  BG_GREEN = 42,
+  BG_BLUE = 44,
+  BG_DEFAULT = 49
+};
+
+class Color {
+  ColorCode cc;
+public:
+  Color(ColorCode cc) : cc(cc) {}
+  friend std::ostream &
+  operator<<(std::ostream &os, const Color &color) {
+    if (isTerminal())
+      return os << "\033[" << color.cc << "m";
+    return os;
+  }
+};
+
+//
+// Error message helper
+//
+
+static class Message {
+private:
+  const char *msg;
+  Color color;
+  std::ostream &os;
+  bool printprefix;
+public:
+  static constexpr char endl() { return '\n'; }
+  bool isendl(char c) { return c == '\n'; }
+  template<typename T>
+  bool isendl(T&&) { return false; }
+  template<typename T>
+  Message &operator<<(T &&v) {
+    if (printprefix) {
+      os << Color(FG_DARK_GRAY) << "osxcross: " << color << msg << ": "
+         << Color(FG_DEFAULT);
+      printprefix = false;
+    }
+    if (isendl(v)) {
+      printprefix = true;
+      os << std::endl;
+    } else {
+      os << v;
+    }
+    return *this;
+  }
+  Message(const char *msg, Color color = FG_RED, std::ostream &os = std::cerr)
+      : msg(msg), color(color), os(os), printprefix(true) {}
+} warn("warning"), err("error"), dbg("debug", FG_LIGHT_MAGENTA),
+  info("info", FG_LIGHT_MAGENTA), warninfo("   info", FG_LIGHT_MAGENTA);
+
 //
 // Executable path
 //
@@ -95,7 +174,7 @@ public:
 
   ~benchmark() {
     time_type diff = getTime() - s;
-    std::cerr << "took: " << diff / 1000000.0 << " ms" << std::endl;
+    dbg << "took: " << diff / 1000000.0 << " ms" << dbg.endl();
   }
 
 private: