diff --git a/src/dmd/compiler.d b/src/dmd/compiler.d
index 12cc768cd67e..44352c82110f 100644
--- a/src/dmd/compiler.d
+++ b/src/dmd/compiler.d
@@ -12,7 +12,143 @@
 
 module dmd.compiler;
 
+import core.stdc.stdio;
+import dmd.cond;
+import dmd.globals;
+
 struct Compiler
 {
     const(char)* vendor; // Compiler backend name
 }
+
+/**
+ * Add default `version` identifier for dmd, and set the
+ * target platform in `global`.
+ * https://dlang.org/spec/version.html#predefined-versions
+ *
+ * Needs to be run after all arguments parsing (command line, DFLAGS environment
+ * variable and config file) in order to add final flags (such as `X86_64` or
+ * the `CRuntime` used).
+ */
+void addDefaultVersionIdentifiers()
+{
+    VersionCondition.addPredefinedGlobalIdent("DigitalMars");
+    static if (TARGET_WINDOS)
+    {
+        VersionCondition.addPredefinedGlobalIdent("Windows");
+        global.params.isWindows = true;
+    }
+    else static if (TARGET_LINUX)
+    {
+        VersionCondition.addPredefinedGlobalIdent("Posix");
+        VersionCondition.addPredefinedGlobalIdent("linux");
+        VersionCondition.addPredefinedGlobalIdent("ELFv1");
+        global.params.isLinux = true;
+    }
+    else static if (TARGET_OSX)
+    {
+        VersionCondition.addPredefinedGlobalIdent("Posix");
+        VersionCondition.addPredefinedGlobalIdent("OSX");
+        global.params.isOSX = true;
+        // For legacy compatibility
+        VersionCondition.addPredefinedGlobalIdent("darwin");
+    }
+    else static if (TARGET_FREEBSD)
+    {
+        VersionCondition.addPredefinedGlobalIdent("Posix");
+        VersionCondition.addPredefinedGlobalIdent("FreeBSD");
+        VersionCondition.addPredefinedGlobalIdent("ELFv1");
+        global.params.isFreeBSD = true;
+    }
+    else static if (TARGET_OPENBSD)
+    {
+        VersionCondition.addPredefinedGlobalIdent("Posix");
+        VersionCondition.addPredefinedGlobalIdent("OpenBSD");
+        VersionCondition.addPredefinedGlobalIdent("ELFv1");
+        global.params.isOpenBSD = true;
+    }
+    else static if (TARGET_SOLARIS)
+    {
+        VersionCondition.addPredefinedGlobalIdent("Posix");
+        VersionCondition.addPredefinedGlobalIdent("Solaris");
+        VersionCondition.addPredefinedGlobalIdent("ELFv1");
+        global.params.isSolaris = true;
+    }
+    else
+    {
+        static assert(0, "fix this");
+    }
+    VersionCondition.addPredefinedGlobalIdent("LittleEndian");
+    VersionCondition.addPredefinedGlobalIdent("D_Version2");
+    VersionCondition.addPredefinedGlobalIdent("all");
+
+    if (global.params.cpu >= CPU.sse2)
+    {
+        VersionCondition.addPredefinedGlobalIdent("D_SIMD");
+        if (global.params.cpu >= CPU.avx)
+            VersionCondition.addPredefinedGlobalIdent("D_AVX");
+        if (global.params.cpu >= CPU.avx2)
+            VersionCondition.addPredefinedGlobalIdent("D_AVX2");
+    }
+
+    if (global.params.is64bit)
+    {
+        VersionCondition.addPredefinedGlobalIdent("D_InlineAsm_X86_64");
+        VersionCondition.addPredefinedGlobalIdent("X86_64");
+        static if (TARGET_WINDOS)
+        {
+            VersionCondition.addPredefinedGlobalIdent("Win64");
+        }
+    }
+    else
+    {
+        VersionCondition.addPredefinedGlobalIdent("D_InlineAsm"); //legacy
+        VersionCondition.addPredefinedGlobalIdent("D_InlineAsm_X86");
+        VersionCondition.addPredefinedGlobalIdent("X86");
+        static if (TARGET_WINDOS)
+        {
+            VersionCondition.addPredefinedGlobalIdent("Win32");
+        }
+    }
+    static if (TARGET_WINDOS)
+    {
+        if (global.params.mscoff)
+            VersionCondition.addPredefinedGlobalIdent("CRuntime_Microsoft");
+        else
+            VersionCondition.addPredefinedGlobalIdent("CRuntime_DigitalMars");
+    }
+    else static if (TARGET_LINUX)
+    {
+        VersionCondition.addPredefinedGlobalIdent("CRuntime_Glibc");
+    }
+
+    if (global.params.isLP64)
+        VersionCondition.addPredefinedGlobalIdent("D_LP64");
+    if (global.params.doDocComments)
+        VersionCondition.addPredefinedGlobalIdent("D_Ddoc");
+    if (global.params.cov)
+        VersionCondition.addPredefinedGlobalIdent("D_Coverage");
+    if (global.params.pic)
+        VersionCondition.addPredefinedGlobalIdent("D_PIC");
+    if (global.params.useUnitTests)
+        VersionCondition.addPredefinedGlobalIdent("unittest");
+    if (global.params.useAssert == CHECKENABLE.on)
+        VersionCondition.addPredefinedGlobalIdent("assert");
+    if (global.params.useArrayBounds == CHECKENABLE.off)
+        VersionCondition.addPredefinedGlobalIdent("D_NoBoundsChecks");
+    if (global.params.betterC)
+        VersionCondition.addPredefinedGlobalIdent("D_BetterC");
+
+    VersionCondition.addPredefinedGlobalIdent("D_HardFloat");
+}
+
+void printPredefinedVersions()
+{
+    if (global.params.verbose && global.params.versionids)
+    {
+        fprintf(global.stdmsg, "predefs  ");
+        foreach (const s; *global.params.versionids)
+            fprintf(global.stdmsg, " %s", s);
+        fprintf(global.stdmsg, "\n");
+    }
+}
diff --git a/src/dmd/frontend.d b/src/dmd/frontend.d
index f31019844261..ef2977d35d1f 100644
--- a/src/dmd/frontend.d
+++ b/src/dmd/frontend.d
@@ -27,24 +27,11 @@ void initDMD()
     import dmd.expression : Expression;
     import dmd.objc : Objc;
     import dmd.builtin : builtin_init;
+    import dmd.compiler : addDefaultVersionIdentifiers, printPredefinedVersions;
 
     global._init;
-
-    version(linux)
-        global.params.isLinux = 1;
-    else version(OSX)
-        global.params.isOSX = 1;
-    else version(FreeBSD)
-        global.params.isFreeBSD = 1;
-    else version(Windows)
-        global.params.isWindows = 1;
-    else version(Solaris)
-        global.params.isSolaris = 1;
-    else version(OpenBSD)
-        global.params.isOpenBSD = 1;
-    else
-        static assert(0, "OS not supported yet.");
-
+    addDefaultVersionIdentifiers();
+    printPredefinedVersions();
     Type._init();
     Id.initialize();
     Module._init();
@@ -53,4 +40,3 @@ void initDMD()
     Objc._init();
     builtin_init();
 }
-
diff --git a/src/dmd/mars.d b/src/dmd/mars.d
index b3448db073f0..3c69296bc0bb 100644
--- a/src/dmd/mars.d
+++ b/src/dmd/mars.d
@@ -26,6 +26,7 @@ import dmd.arraytypes;
 import dmd.astcodegen;
 import dmd.gluelayer;
 import dmd.builtin;
+import dmd.compiler;
 import dmd.cond;
 import dmd.console;
 import dmd.dinifile;
@@ -1211,143 +1212,6 @@ private void setDefaultLibrary()
         global.params.debuglibname = global.params.defaultlibname;
 }
 
-
-/**
- * Add default `version` identifier for dmd, and set the
- * target platform in `global`.
- * https://dlang.org/spec/version.html#predefined-versions
- *
- * Needs to be run after all arguments parsing (command line, DFLAGS environment
- * variable and config file) in order to add final flags (such as `X86_64` or
- * the `CRuntime` used).
- */
-private void addDefaultVersionIdentifiers()
-{
-    VersionCondition.addPredefinedGlobalIdent("DigitalMars");
-    static if (TARGET.Windows)
-    {
-        VersionCondition.addPredefinedGlobalIdent("Windows");
-        global.params.isWindows = true;
-    }
-    else static if (TARGET.Linux)
-    {
-        VersionCondition.addPredefinedGlobalIdent("Posix");
-        VersionCondition.addPredefinedGlobalIdent("linux");
-        VersionCondition.addPredefinedGlobalIdent("ELFv1");
-        global.params.isLinux = true;
-    }
-    else static if (TARGET.OSX)
-    {
-        VersionCondition.addPredefinedGlobalIdent("Posix");
-        VersionCondition.addPredefinedGlobalIdent("OSX");
-        global.params.isOSX = true;
-        // For legacy compatibility
-        VersionCondition.addPredefinedGlobalIdent("darwin");
-    }
-    else static if (TARGET.FreeBSD)
-    {
-        VersionCondition.addPredefinedGlobalIdent("Posix");
-        VersionCondition.addPredefinedGlobalIdent("FreeBSD");
-        VersionCondition.addPredefinedGlobalIdent("ELFv1");
-        global.params.isFreeBSD = true;
-    }
-    else static if (TARGET.OpenBSD)
-    {
-        VersionCondition.addPredefinedGlobalIdent("Posix");
-        VersionCondition.addPredefinedGlobalIdent("OpenBSD");
-        VersionCondition.addPredefinedGlobalIdent("ELFv1");
-        global.params.isOpenBSD = true;
-    }
-    else static if (TARGET.Solaris)
-    {
-        VersionCondition.addPredefinedGlobalIdent("Posix");
-        VersionCondition.addPredefinedGlobalIdent("Solaris");
-        VersionCondition.addPredefinedGlobalIdent("ELFv1");
-        global.params.isSolaris = true;
-    }
-    else
-    {
-        static assert(0, "fix this");
-    }
-    VersionCondition.addPredefinedGlobalIdent("LittleEndian");
-    VersionCondition.addPredefinedGlobalIdent("D_Version2");
-    VersionCondition.addPredefinedGlobalIdent("all");
-
-    if (global.params.cpu >= CPU.sse2)
-    {
-        VersionCondition.addPredefinedGlobalIdent("D_SIMD");
-        if (global.params.cpu >= CPU.avx)
-            VersionCondition.addPredefinedGlobalIdent("D_AVX");
-        if (global.params.cpu >= CPU.avx2)
-            VersionCondition.addPredefinedGlobalIdent("D_AVX2");
-    }
-
-    if (global.params.is64bit)
-    {
-        VersionCondition.addPredefinedGlobalIdent("D_InlineAsm_X86_64");
-        VersionCondition.addPredefinedGlobalIdent("X86_64");
-        static if (TARGET.Windows)
-        {
-            VersionCondition.addPredefinedGlobalIdent("Win64");
-        }
-    }
-    else
-    {
-        VersionCondition.addPredefinedGlobalIdent("D_InlineAsm"); //legacy
-        VersionCondition.addPredefinedGlobalIdent("D_InlineAsm_X86");
-        VersionCondition.addPredefinedGlobalIdent("X86");
-        static if (TARGET.Windows)
-        {
-            VersionCondition.addPredefinedGlobalIdent("Win32");
-        }
-    }
-    static if (TARGET.Windows)
-    {
-        if (global.params.mscoff)
-            VersionCondition.addPredefinedGlobalIdent("CRuntime_Microsoft");
-        else
-            VersionCondition.addPredefinedGlobalIdent("CRuntime_DigitalMars");
-    }
-    else static if (TARGET.Linux)
-    {
-        VersionCondition.addPredefinedGlobalIdent("CRuntime_Glibc");
-    }
-
-    if (global.params.isLP64)
-        VersionCondition.addPredefinedGlobalIdent("D_LP64");
-    if (global.params.doDocComments)
-        VersionCondition.addPredefinedGlobalIdent("D_Ddoc");
-    if (global.params.cov)
-        VersionCondition.addPredefinedGlobalIdent("D_Coverage");
-    if (global.params.pic)
-        VersionCondition.addPredefinedGlobalIdent("D_PIC");
-    if (global.params.useUnitTests)
-        VersionCondition.addPredefinedGlobalIdent("unittest");
-    if (global.params.useAssert == CHECKENABLE.on)
-        VersionCondition.addPredefinedGlobalIdent("assert");
-    if (global.params.useArrayBounds == CHECKENABLE.off)
-        VersionCondition.addPredefinedGlobalIdent("D_NoBoundsChecks");
-    if (global.params.betterC)
-        VersionCondition.addPredefinedGlobalIdent("D_BetterC");
-
-    VersionCondition.addPredefinedGlobalIdent("D_HardFloat");
-
-    printPredefinedVersions();
-}
-
-private void printPredefinedVersions()
-{
-    if (global.params.verbose && global.versionids)
-    {
-        fprintf(global.stdmsg, "predefs  ");
-        foreach (const str; *global.versionids)
-            fprintf(global.stdmsg, " %s", str.toChars);
-
-        fprintf(global.stdmsg, "\n");
-    }
-}
-
-
 /****************************************
  * Determine the instruction set to be used.
  * Params:
@@ -2160,6 +2024,7 @@ private bool parseCommandLine(const ref Strings arguments, const size_t argc, re
     }
     return errors;
 }
+<<<<<<< 1018db023831a8c348bb8f9121b08fabb6e32fc2
 
 
 private __gshared bool includeImports = false;
@@ -2436,3 +2301,5 @@ private void parseModulePattern(const(char)* modulePattern, MatcherNode* dst, us
         }
     }
 }
+=======
+>>>>>>> Move addDefaultVersionIdentifiers to frontend.d
diff --git a/src/posix.mak b/src/posix.mak
index 276ac94ac0de..b77ae052ac83 100644
--- a/src/posix.mak
+++ b/src/posix.mak
@@ -444,7 +444,7 @@ $G/backend.a: $(G_OBJS) $(SRC_MAKE)
 	$(AR) rcs $@ $(G_OBJS)
 
 $G/lexer.a: $(LEXER_SRCS) $(LEXER_ROOT) $(HOST_DMD_PATH) $(SRC_MAKE)
-	CC="$(HOST_CXX)" $(HOST_DMD_RUN) -lib -of$@ $(MODEL_FLAG) -J$G -L-lstdc++ $(DFLAGS) $(LEXER_SRCS) $(LEXER_ROOT)
+	CC="$(HOST_CXX)" $(HOST_DMD_RUN) -lib -of$@ $(MODEL_FLAG) -J$G -J../res -L-lstdc++ $(DFLAGS) $(LEXER_SRCS) $(LEXER_ROOT)
 
 $G/dmd_frontend: $(FRONT_SRCS) $D/gluelayer.d $(ROOT_SRCS) $G/newdelete.o $G/lexer.a $(STRING_IMPORT_FILES) $(HOST_DMD_PATH)
 	CC="$(HOST_CXX)" $(HOST_DMD_RUN) -of$@ $(MODEL_FLAG) -vtls -J$G -J../res -L-lstdc++ $(DFLAGS) $(filter-out $(STRING_IMPORT_FILES) $(HOST_DMD_PATH),$^) -version=NoBackend
@@ -466,13 +466,13 @@ unittest: $G/dmd-unittest
 ######## DMD as a library examples
 
 EXAMPLES=$(addprefix $G/examples/, avg impvisitor)
-PARSER_SRCS=$(addsuffix .d, $(addprefix $D/,parse astbase parsetimevisitor transitivevisitor permissivevisitor strictvisitor))
+PARSER_SRCS=$(addsuffix .d, $(addprefix $D/,parse astbase compiler parsetimevisitor transitivevisitor permissivevisitor strictvisitor))
 
 $G/parser.a: $(PARSER_SRCS) $(LEXER_SRCS) $(ROOT_SRCS) $G/dmd $G/dmd.conf $(SRC_MAKE)
-	CC="$(HOST_CXX)" $G/dmd -lib -of$@ $(MODEL_FLAG) -L-lstdc++ -J$G $(DFLAGS) $(PARSER_SRCS) $(LEXER_SRCS) $(ROOT_SRCS)
+	CC="$(HOST_CXX)" $G/dmd -lib -of$@ $(MODEL_FLAG) -L-lstdc++ -J$G -J../res $(DFLAGS) $(PARSER_SRCS) $(LEXER_SRCS) $(ROOT_SRCS)
 
 $G/examples/%: $(EX)/%.d $G/parser.a $G/dmd
-	CC="$(HOST_CXX)" $G/dmd -of$@ $(MODEL_FLAG) $(DFLAGS) $G/parser.a $<
+	CC="$(HOST_CXX)" $G/dmd -of$@ $(MODEL_FLAG) -J../res $(DFLAGS) $G/parser.a $<
 
 build-examples: $(EXAMPLES)