Hi,
I am attaching a patch addressing llvm.org/bugs/show_bug.cgi?id=20467
Vassil
Index: include/clang/Basic/DiagnosticFrontendKinds.td
===================================================================
--- include/clang/Basic/DiagnosticFrontendKinds.td (revision 217432)
+++ include/clang/Basic/DiagnosticFrontendKinds.td (working copy)
@@ -149,6 +149,9 @@
def err_missing_module_name : Error<
"no module name provided; specify one with -fmodule-name=">,
DefaultFatal;
+def err_module_cache_path_not_writable : Error<
+ "implicitly generated module cache %0 is not writable">,
+ DefaultFatal;
def err_missing_module : Error<
"no module named '%0' declared in module map file '%1'">, DefaultFatal;
def err_no_submodule : Error<"no submodule named %0 in module '%1'">;
Index: lib/Frontend/CompilerInstance.cpp
===================================================================
--- lib/Frontend/CompilerInstance.cpp (revision 217432)
+++ lib/Frontend/CompilerInstance.cpp (working copy)
@@ -339,6 +339,15 @@
if (!getHeaderSearchOpts().DisableModuleHash)
llvm::sys::path::append(SpecificModuleCache,
getInvocation().getModuleHash());
+
+ // If the path is not writable we can't do anything but diagnose.
+ if (llvm::sys::fs::exists(SpecificModuleCache.str()) &&
+ !llvm::sys::fs::can_write(SpecificModuleCache.str())) {
+ SourceLocation NoLoc;
+ PP->getDiagnostics().Report(NoLoc, diag::err_module_cache_path_not_writable)
+ << SpecificModuleCache;
+ }
+
PP->getHeaderSearchInfo().setModuleCachePath(SpecificModuleCache);
// Handle generating dependencies, if requested.
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