saideepaksana wrote:
Hi Our main changes are in the file `SemaTemplate.cpp` and there are some
changes from other people, which when we are trying to change, getting error's
locally. So our main changes in the `SemaTemplate.cpp` are in the lines 8240
only,
```
bool
Sema::CheckTemplateDeclScope(Scope *S, TemplateParameterList *TemplateParams) {
if (!S)
return false;
// Find the nearest enclosing declaration scope.
S = S->getDeclParent();
// C++ [temp.pre]p6: [P2096]
// A template, explicit specialization, or partial specialization shall not
// have C linkage.
DeclContext *Ctx = S->getEntity();
if (Ctx && Ctx->isExternCContext()) {
SourceRange Range =
TemplateParams->getTemplateLoc().isInvalid() && TemplateParams->size()
? TemplateParams->getParam(0)->getSourceRange()
: TemplateParams->getSourceRange();
Diag(Range.getBegin(), diag::err_template_linkage) << Range;
if (const LinkageSpecDecl *LSD = Ctx->getExternCContext())
Diag(LSD->getExternLoc(), diag::note_extern_c_begins_here);
return true;
}
Ctx = Ctx ? Ctx->getRedeclContext() : nullptr;
// Compute a SourceLocation to use for diagnostics. Prefer the explicit
// template location, but fall back to nearby Decl locations when needed.
SourceLocation Loc = TemplateParams->getTemplateLoc();
if (Loc.isInvalid())
Loc = TemplateParams->getSourceRange().getBegin();
if (Loc.isInvalid() && Ctx) {
if (const Decl *D = dyn_cast<Decl>(Ctx))
Loc = D->getBeginLoc();
}
// Try to extract class context if present.
CXXRecordDecl *RD = Ctx ? dyn_cast<CXXRecordDecl>(Ctx) : nullptr;
if (Loc.isInvalid() && RD)
Loc = RD->getLocation();
if (Ctx) {
if (Ctx->isFileContext())
return false;
if (RD) {
// C++ [temp.mem]p2:
// A local class shall not have member templates.
if (RD->isLocalClass()) {
// when the template location is not valid we are trying to use
fallback SourceLocation such that diagnostic prints a usable file:line:col
location
if (Loc.isInvalid())
Loc = TemplateParams->getSourceRange().getBegin();
return Diag(Loc, diag::err_template_inside_local_class)
<< TemplateParams->getSourceRange();
}
else {
return false;
}
}
}
// when teplate declared outside the namspace or class scope it Fallbacks and
it give valid SourceLocation with file:line info.
if (Loc.isInvalid())
Loc = TemplateParams->getSourceRange().getBegin();
return Diag(Loc, diag::err_template_outside_namespace_or_class_scope)
<< TemplateParams->getSourceRange();
}
```
https://github.com/llvm/llvm-project/pull/167201
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