Merge pull request #975 from jbrodman/windll

Change dll export feature to a switch.

ispc.cpp

@@ -1316,6 +1316,7 @@ Globals::Globals() {
         FATAL("Current directory path too long!");
 #endif
     forceAlignment = -1;
+    dllExport = false;
 }
 
 ///////////////////////////////////////////////////////////////////////////

ispc.h

@@ -612,6 +612,9 @@ struct Globals {
     /** Indicates that alignment in memory allocation routines should be
         forced to have given value. -1 value means natural alignment for the platforms. */
     int forceAlignment;
+
+    /** When true, flag non-static functions with dllexport attribute on Windows. */
+    bool dllExport;
 };
 
 enum {

main.cpp

@@ -153,6 +153,7 @@ devUsage(int ret) {
     lPrintVersion();
     printf("\nusage (developer options): ispc\n");
     printf("    [--debug]\t\t\t\tPrint information useful for debugging ispc\n");
+    printf("    [--dllexport]\t\t\tMake non-static functions DLL exported.  Windows only.\n");  
     printf("    [--fuzz-test]\t\t\tRandomly perturb program input to test error conditions\n");
     printf("    [--fuzz-seed=<value>]\t\tSeed value for RNG for fuzz testing\n");
     printf("    [--opt=<option>]\t\t\tSet optimization option\n");
@@ -379,6 +380,8 @@ int main(int Argc, char *Argv[]) {
         }
         else if (!strcmp(argv[i], "--debug"))
             g->debugPrint = true;
+        else if (!strcmp(argv[i], "--dllexport"))
+            g->dllExport = true;
         else if (!strcmp(argv[i], "--instrument"))
             g->emitInstrumentation = true;
         else if (!strcmp(argv[i], "-g")) {

module.cpp

@@ -920,7 +920,7 @@ Module::AddFunctionDeclaration(const std::string &name,
     
 #ifdef ISPC_IS_WINDOWS
     // Make export functions callable from DLLS.
-    if (functionType->isExported) {
+    if ((g->dllExport) && (storageClass != SC_STATIC)) {
       function->setDLLStorageClass(llvm::GlobalValue::DLLExportStorageClass);
     }
 #endif