erikjv created this revision.
erikjv added a reviewer: bkramer.
erikjv added a subscriber: cfe-commits.
r276653 suppressed the pragma once warning when generating a PCH file.
This patch extends that to any main file for which clang is told (with
the -x option) that it's a header file. It will also suppress the
warning "#include_next in primary source file".
https://reviews.llvm.org/D25989
Files:
include/clang/Basic/LangOptions.h
lib/Basic/LangOptions.cpp
lib/Frontend/CompilerInvocation.cpp
lib/Lex/PPDirectives.cpp
lib/Lex/PPMacroExpansion.cpp
lib/Lex/Pragma.cpp
test/Preprocessor/header_is_main_file.c
Index: test/Preprocessor/header_is_main_file.c
===================================================================
--- /dev/null
+++ test/Preprocessor/header_is_main_file.c
@@ -0,0 +1,8 @@
+// RUN: %clang_cc1 -x c-header -ffreestanding -Eonly -verify %s
+// expected-no-diagnostics
+
+#pragma once
+#include_next "stdint.h"
+#if !__has_include_next("stdint.h")
+#error "__has_include_next failed"
+#endif
Index: lib/Lex/Pragma.cpp
===================================================================
--- lib/Lex/Pragma.cpp
+++ lib/Lex/Pragma.cpp
@@ -372,8 +372,10 @@
///
void Preprocessor::HandlePragmaOnce(Token &OnceTok) {
// Don't honor the 'once' when handling the primary source file, unless
- // this is a prefix to a TU, which indicates we're generating a PCH file.
- if (isInPrimaryFile() && TUKind != TU_Prefix) {
+ // this is a prefix to a TU, which indicates we're generating a PCH file, or
+ // when the main file is a header (e.g. when -xc-header is provided on the
+ // commandline).
+ if (isInPrimaryFile() && TUKind != TU_Prefix && !getLangOpts().IsHeaderFile) {
Diag(OnceTok, diag::pp_pragma_once_in_main_file);
return;
}
Index: lib/Lex/PPMacroExpansion.cpp
===================================================================
--- lib/Lex/PPMacroExpansion.cpp
+++ lib/Lex/PPMacroExpansion.cpp
@@ -1421,7 +1421,11 @@
// Preprocessor::HandleIncludeNextDirective.
const DirectoryLookup *Lookup = PP.GetCurDirLookup();
const FileEntry *LookupFromFile = nullptr;
- if (PP.isInPrimaryFile()) {
+ if (PP.isInPrimaryFile() && PP.getLangOpts().IsHeaderFile) {
+ // If the main file is a header, then it's either for PCH/AST generation,
+ // or libclang opened it. Either way, handle it as a normal include below
+ // and do not complain about __has_include_next.
+ } else if (PP.isInPrimaryFile()) {
Lookup = nullptr;
PP.Diag(Tok, diag::pp_include_next_in_primary);
} else if (PP.getCurrentSubmodule()) {
Index: lib/Lex/PPDirectives.cpp
===================================================================
--- lib/Lex/PPDirectives.cpp
+++ lib/Lex/PPDirectives.cpp
@@ -2058,7 +2058,11 @@
// diagnostic.
const DirectoryLookup *Lookup = CurDirLookup;
const FileEntry *LookupFromFile = nullptr;
- if (isInPrimaryFile()) {
+ if (isInPrimaryFile() && LangOpts.IsHeaderFile) {
+ // If the main file is a header, then it's either for PCH/AST generation,
+ // or libclang opened it. Either way, handle it as a normal include below
+ // and do not complain about include_next.
+ } else if (isInPrimaryFile()) {
Lookup = nullptr;
Diag(IncludeNextTok, diag::pp_include_next_in_primary);
} else if (CurSubmodule) {
Index: lib/Frontend/CompilerInvocation.cpp
===================================================================
--- lib/Frontend/CompilerInvocation.cpp
+++ lib/Frontend/CompilerInvocation.cpp
@@ -1111,7 +1111,8 @@
}
static InputKind ParseFrontendArgs(FrontendOptions &Opts, ArgList &Args,
- DiagnosticsEngine &Diags) {
+ DiagnosticsEngine &Diags,
+ bool &IsHeaderFile) {
using namespace options;
Opts.ProgramAction = frontend::ParseSyntaxOnly;
if (const Arg *A = Args.getLastArg(OPT_Action_Group)) {
@@ -1358,6 +1359,13 @@
if (DashX == IK_None)
Diags.Report(diag::err_drv_invalid_value)
<< A->getAsString(Args) << A->getValue();
+ IsHeaderFile = llvm::StringSwitch<bool>(A->getValue())
+ .Case("c-header", true)
+ .Case("cl-header", true)
+ .Case("objective-c-header", true)
+ .Case("c++-header", true)
+ .Case("objective-c++-header", true)
+ .Default(false);
}
// '-' is the default input if none is given.
@@ -2415,7 +2423,8 @@
ParseCommentArgs(LangOpts.CommentOpts, Args);
ParseFileSystemArgs(Res.getFileSystemOpts(), Args);
// FIXME: We shouldn't have to pass the DashX option around here
- InputKind DashX = ParseFrontendArgs(Res.getFrontendOpts(), Args, Diags);
+ InputKind DashX = ParseFrontendArgs(Res.getFrontendOpts(), Args, Diags,
+ LangOpts.IsHeaderFile);
ParseTargetArgs(Res.getTargetOpts(), Args, Diags);
Success &= ParseCodeGenArgs(Res.getCodeGenOpts(), Args, DashX, Diags,
Res.getTargetOpts());
Index: lib/Basic/LangOptions.cpp
===================================================================
--- lib/Basic/LangOptions.cpp
+++ lib/Basic/LangOptions.cpp
@@ -15,7 +15,8 @@
using namespace clang;
-LangOptions::LangOptions() {
+LangOptions::LangOptions()
+ : IsHeaderFile(false) {
#define LANGOPT(Name, Bits, Default, Description) Name = Default;
#define ENUM_LANGOPT(Name, Type, Bits, Default, Description) set##Name(Default);
#include "clang/Basic/LangOptions.def"
@@ -34,6 +35,7 @@
SanitizerBlacklistFiles.clear();
CurrentModule.clear();
+ IsHeaderFile = false;
}
bool LangOptions::isNoBuiltinFunc(StringRef FuncName) const {
Index: include/clang/Basic/LangOptions.h
===================================================================
--- include/clang/Basic/LangOptions.h
+++ include/clang/Basic/LangOptions.h
@@ -132,6 +132,10 @@
/// host code generation.
std::string OMPHostIRFile;
+ /// \brief Indicates whether the front-end is explicitly told that the
+ /// input is a header file (i.e. -x c-header).
+ bool IsHeaderFile;
+
LangOptions();
// Define accessors/mutators for language options of enumeration type.
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