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llvm-project/clang/test/Modules/auto-import-unavailable.cpp

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[modules] PR20507: Avoid silent textual inclusion. Summary: If a module was unavailable (either a missing requirement on the module being imported, or a missing file anywhere in the top-level module (and not dominated by an unsatisfied `requires`)), we would silently treat inclusions as textual. This would cause all manner of crazy and confusing errors (and would also silently "work" sometimes, making the problem difficult to track down). I'm really not a fan of the `M->isAvailable(getLangOpts(), getTargetInfo(), Requirement, MissingHeader)` function; it seems to do too many things at once, but for now I've done things in a sort of awkward way. The changes to test/Modules/Inputs/declare-use/module.map were necessitated because the thing that was meant to be tested there (introduced in r197805) was predicated on silently falling back to textual inclusion, which we no longer do. The changes to test/Modules/Inputs/macro-reexport/module.modulemap are just an overlooked missing header that seems to have been missing since this code was committed (r213922), which is now caught. Reviewers: rsmith, benlangmuir, djasper Subscribers: cfe-commits Differential Revision: http://reviews.llvm.org/D10423 llvm-svn: 245228
2015-08-18 00:39:30 +08:00
// RUN: rm -rf %t
// RUN: not %clang_cc1 -x c++ -Rmodule-build -DMISSING_HEADER -fmodules -fimplicit-module-maps -fmodules-cache-path=%t -I %S/Inputs/auto-import-unavailable %s 2>&1 | FileCheck %s --check-prefix=MISSING-HEADER
// RUN: %clang_cc1 -x c++ -Rmodule-build -DNONREQUIRED_MISSING_HEADER -fmodules -fimplicit-module-maps -fmodules-cache-path=%t -I %S/Inputs/auto-import-unavailable %s 2>&1 | FileCheck %s --check-prefix=NONREQUIRED-MISSING-HEADER
// RUN: not %clang_cc1 -x c++ -Rmodule-build -DMISSING_REQUIREMENT -fmodules -fimplicit-module-maps -fmodules-cache-path=%t -I %S/Inputs/auto-import-unavailable %s 2>&1 | FileCheck %s --check-prefix=MISSING-REQUIREMENT
#ifdef MISSING_HEADER
// Even if the header we ask for is not missing, if the top-level module
// containing it has a missing header, then the whole top-level is
// unavailable and we issue an error.
// MISSING-HEADER: module.modulemap:2:27: error: header 'missing_header/missing.h' not found
// MISSING-HEADER-DAG: auto-import-unavailable.cpp:[[@LINE+1]]:10: note: submodule of top-level module 'missing_header' implicitly imported here
#include "missing_header/not_missing.h"
// We should not attempt to build the module.
// MISSING-HEADER-NOT: remark: building module
#endif // #ifdef MISSING_HEADER
#ifdef NONREQUIRED_MISSING_HEADER
// However, if the missing header is dominated by an unsatisfied
// `requires`, then that is acceptable.
// This also tests that an unsatisfied `requires` elsewhere in the
// top-level module doesn't affect an available module.
// NONREQUIRED-MISSING-HEADER: auto-import-unavailable.cpp:[[@LINE+2]]:10: remark: building module 'nonrequired_missing_header'
// NONREQUIRED-MISSING-HEADER: auto-import-unavailable.cpp:[[@LINE+1]]:10: remark: finished building module 'nonrequired_missing_header'
#include "nonrequired_missing_header/not_missing.h"
#endif // #ifdef NONREQUIRED_MISSING_HEADER
#ifdef MISSING_REQUIREMENT
// If the header is unavailable due to a missing requirement, an error
// should be emitted if a user tries to include it.
// MISSING-REQUIREMENT:module.modulemap:16:8: error: module 'missing_requirement' requires feature 'nonexistent_feature'
// MISSING-REQUIREMENT: auto-import-unavailable.cpp:[[@LINE+1]]:10: note: submodule of top-level module 'missing_requirement' implicitly imported here
#include "missing_requirement.h"
// MISSING-REQUIREMENT-NOT: remark: building module
#endif // #ifdef MISSING_REQUIREMENT