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The `ASTReader` populates `Module::PresumedModuleMapFile` only for top-level
modules, not submodules. To avoid generating empty `-fmodule-map-file=`
arguments, make discovered modules depend on top-level precompiled modules. The
granularity of submodules is not important here.
The documentation of `Module::PresumedModuleMapFile` says this field is
non-empty only when building from preprocessed source. This means there can
still be cases where the dependency scanner generates empty
`-fmodule-map-file=` arguments. That's being addressed in separate patch:
D108544 <https://reviews.llvm.org/D108544>.
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D108647
Files:
clang/lib/Tooling/DependencyScanning/ModuleDepCollector.cpp
clang/test/ClangScanDeps/Inputs/modules-pch-common-submodule/cdb_pch.json
clang/test/ClangScanDeps/Inputs/modules-pch-common-submodule/cdb_tu.json
clang/test/ClangScanDeps/Inputs/modules-pch-common-submodule/mod_common.h
clang/test/ClangScanDeps/Inputs/modules-pch-common-submodule/mod_common_sub.h
clang/test/ClangScanDeps/Inputs/modules-pch-common-submodule/mod_tu.h
clang/test/ClangScanDeps/Inputs/modules-pch-common-submodule/module.modulemap
clang/test/ClangScanDeps/Inputs/modules-pch-common-submodule/pch.h
clang/test/ClangScanDeps/Inputs/modules-pch-common-submodule/tu.c
clang/test/ClangScanDeps/modules-pch-common-submodule.c
Index: clang/test/ClangScanDeps/modules-pch-common-submodule.c
===================================================================
--- /dev/null
+++ clang/test/ClangScanDeps/modules-pch-common-submodule.c
@@ -0,0 +1,134 @@
+// RUN: rm -rf %t && mkdir %t
+// RUN: cp %S/Inputs/modules-pch-common-submodule/* %t
+
+// Scan dependencies of the PCH:
+//
+// RUN: sed "s|DIR|%/t|g" %S/Inputs/modules-pch-common-submodule/cdb_pch.json > %t/cdb.json
+// RUN: echo -%t > %t/result_pch.json
+// RUN: clang-scan-deps -compilation-database %t/cdb.json -format experimental-full \
+// RUN: -generate-modules-path-args -module-files-dir %t/build >> %t/result_pch.json
+// RUN: cat %t/result_pch.json | sed 's:\\\\\?:/:g' | FileCheck %s -check-prefix=CHECK-PCH
+//
+// CHECK-PCH: -[[PREFIX:.*]]
+// CHECK-PCH-NEXT: {
+// CHECK-PCH-NEXT: "modules": [
+// CHECK-PCH-NEXT: {
+// CHECK-PCH-NEXT: "clang-module-deps": [],
+// CHECK-PCH-NEXT: "clang-modulemap-file": "[[PREFIX]]/module.modulemap",
+// CHECK-PCH-NEXT: "command-line": [
+// CHECK-PCH-NEXT: "-cc1"
+// CHECK-PCH: "-emit-module"
+// CHECK-PCH: "-fmodules"
+// CHECK-PCH: "-fmodule-name=ModCommon"
+// CHECK-PCH: "-fno-implicit-modules"
+// CHECK-PCH: ],
+// CHECK-PCH-NEXT: "context-hash": "[[HASH_MOD_COMMON:.*]]",
+// CHECK-PCH-NEXT: "file-deps": [
+// CHECK-PCH-NEXT: "[[PREFIX]]/mod_common.h",
+// CHECK-PCH-NEXT: "[[PREFIX]]/mod_common_sub.h",
+// CHECK-PCH-NEXT: "[[PREFIX]]/module.modulemap"
+// CHECK-PCH-NEXT: ],
+// CHECK-PCH-NEXT: "name": "ModCommon"
+// CHECK-PCH-NEXT: }
+// CHECK-PCH-NEXT: ],
+// CHECK-PCH-NEXT: "translation-units": [
+// CHECK-PCH-NEXT: {
+// CHECK-PCH-NEXT: "clang-context-hash": "[[HASH_PCH:.*]]",
+// CHECK-PCH-NEXT: "clang-module-deps": [
+// CHECK-PCH-NEXT: {
+// CHECK-PCH-NEXT: "context-hash": "[[HASH_MOD_COMMON]]",
+// CHECK-PCH-NEXT: "module-name": "ModCommon"
+// CHECK-PCH-NEXT: }
+// CHECK-PCH-NEXT: ],
+// CHECK-PCH-NEXT: "command-line": [
+// CHECK-PCH-NEXT: "-fno-implicit-modules"
+// CHECK-PCH-NEXT: "-fno-implicit-module-maps"
+// CHECK-PCH-NEXT: "-fmodule-file=[[PREFIX]]/build/[[HASH_MOD_COMMON]]/ModCommon-{{.*}}.pcm"
+// CHECK-PCH-NEXT: "-fmodule-map-file=[[PREFIX]]/module.modulemap"
+// CHECK-PCH-NEXT: ],
+// CHECK-PCH-NEXT: "file-deps": [
+// CHECK-PCH-NEXT: "[[PREFIX]]/pch.h"
+// CHECK-PCH-NEXT: ],
+// CHECK-PCH-NEXT: "input-file": "[[PREFIX]]/pch.h"
+// CHECK-PCH-NEXT: }
+// CHECK-PCH-NEXT: ]
+// CHECK-PCH-NEXT: }
+
+// Explicitly build the PCH:
+//
+// RUN: tail -n +2 %t/result_pch.json > %t/result_pch_stripped.json
+// RUN: %python %S/../../utils/module-deps-to-rsp.py %t/result_pch_stripped.json \
+// RUN: --module-name=ModCommon > %t/mod_common.cc1.rsp
+// RUN: %python %S/../../utils/module-deps-to-rsp.py %t/result_pch_stripped.json \
+// RUN: --tu-index=0 > %t/pch.rsp
+//
+// RUN: %clang @%t/mod_common.cc1.rsp
+// RUN: %clang -x c-header %t/pch.h -fmodules -gmodules -fimplicit-module-maps \
+// RUN: -fmodules-cache-path=%t/cache -o %t/pch.h.gch @%t/pch.rsp
+
+// Scan dependencies of the TU:
+//
+// RUN: sed "s|DIR|%/t|g" %S/Inputs/modules-pch-common-submodule/cdb_tu.json > %t/cdb.json
+// RUN: echo -%t > %t/result_tu.json
+// RUN: clang-scan-deps -compilation-database %t/cdb.json -format experimental-full \
+// RUN: -generate-modules-path-args -module-files-dir %t/build >> %t/result_tu.json
+// RUN: cat %t/result_tu.json | sed 's:\\\\\?:/:g' | FileCheck %s -check-prefix=CHECK-TU
+//
+// CHECK-TU: -[[PREFIX:.*]]
+// CHECK-TU-NEXT: {
+// CHECK-TU-NEXT: "modules": [
+// CHECK-TU-NEXT: {
+// CHECK-TU-NEXT: "clang-module-deps": [],
+// CHECK-TU-NEXT: "clang-modulemap-file": "[[PREFIX]]/module.modulemap",
+// CHECK-TU-NEXT: "command-line": [
+// CHECK-TU-NEXT: "-cc1"
+// CHECK-TU: "-fmodule-map-file=[[PREFIX]]/module.modulemap"
+// CHECK-TU: "-emit-module"
+// CHECK-TU: "-fmodule-file=[[PREFIX]]/build/[[HASH_MOD_COMMON:.*]]/ModCommon-{{.*}}.pcm"
+// CHECK-TU: "-fmodules"
+// CHECK-TU: "-fmodule-name=ModTU"
+// CHECK-TU: "-fno-implicit-modules"
+// CHECK-TU: ],
+// CHECK-TU-NEXT: "context-hash": "[[HASH_MOD_TU:.*]]",
+// CHECK-TU-NEXT: "file-deps": [
+// CHECK-TU-NEXT: "[[PREFIX]]/mod_tu.h",
+// CHECK-TU-NEXT: "[[PREFIX]]/module.modulemap"
+// CHECK-TU-NEXT: ],
+// CHECK-TU-NEXT: "name": "ModTU"
+// CHECK-TU-NEXT: }
+// CHECK-TU-NEXT: ],
+// CHECK-TU-NEXT: "translation-units": [
+// CHECK-TU-NEXT: {
+// CHECK-TU-NEXT: "clang-context-hash": "[[HASH_TU:.*]]",
+// CHECK-TU-NEXT: "clang-module-deps": [
+// CHECK-TU-NEXT: {
+// CHECK-TU-NEXT: "context-hash": "[[HASH_MOD_TU]]"
+// CHECK-TU-NEXT: "module-name": "ModTU"
+// CHECK-TU-NEXT: }
+// CHECK-TU-NEXT: ],
+// CHECK-TU-NEXT: "command-line": [
+// CHECK-TU-NEXT: "-fno-implicit-modules",
+// CHECK-TU-NEXT: "-fno-implicit-module-maps",
+// CHECK-TU-NEXT: "-fmodule-file=[[PREFIX]]/build/[[HASH_MOD_TU:.*]]/ModTU-{{.*}}.pcm",
+// CHECK-TU-NEXT: "-fmodule-map-file=[[PREFIX]]/module.modulemap"
+// CHECK-TU-NEXT: ],
+// CHECK-TU-NEXT: "file-deps": [
+// CHECK-TU-NEXT: "[[PREFIX]]/tu.c",
+// CHECK-TU-NEXT: "[[PREFIX]]/pch.h.gch"
+// CHECK-TU-NEXT: ],
+// CHECK-TU-NEXT: "input-file": "[[PREFIX]]/tu.c"
+// CHECK-TU-NEXT: }
+// CHECK-TU-NEXT: ]
+// CHECK-TU-NEXT: }
+
+// Explicitly build the TU:
+//
+// RUN: tail -n +2 %t/result_tu.json > %t/result_tu_stripped.json
+// RUN: %python %S/../../utils/module-deps-to-rsp.py %t/result_tu_stripped.json \
+// RUN: --module-name=ModTU > %t/mod_tu.cc1.rsp
+// RUN: %python %S/../../utils/module-deps-to-rsp.py %t/result_tu_stripped.json \
+// RUN: --tu-index=0 > %t/tu.rsp
+//
+// RUN: %clang @%t/mod_tu.cc1.rsp
+// RUN: %clang -fsyntax-only %t/tu.c -fmodules -gmodules -fimplicit-module-maps \
+// RUN: -fmodules-cache-path=%t/cache -include %t/pch.h -o %t/tu.o @%t/tu.rsp
Index: clang/test/ClangScanDeps/Inputs/modules-pch-common-submodule/tu.c
===================================================================
--- /dev/null
+++ clang/test/ClangScanDeps/Inputs/modules-pch-common-submodule/tu.c
@@ -0,0 +1 @@
+#include "mod_tu.h"
Index: clang/test/ClangScanDeps/Inputs/modules-pch-common-submodule/pch.h
===================================================================
--- /dev/null
+++ clang/test/ClangScanDeps/Inputs/modules-pch-common-submodule/pch.h
@@ -0,0 +1 @@
+#include "mod_common.h"
Index: clang/test/ClangScanDeps/Inputs/modules-pch-common-submodule/module.modulemap
===================================================================
--- /dev/null
+++ clang/test/ClangScanDeps/Inputs/modules-pch-common-submodule/module.modulemap
@@ -0,0 +1,11 @@
+module ModCommon {
+ header "mod_common.h"
+
+ module ModCommonSub {
+ header "mod_common_sub.h"
+ }
+}
+
+module ModTU {
+ header "mod_tu.h"
+}
Index: clang/test/ClangScanDeps/Inputs/modules-pch-common-submodule/mod_tu.h
===================================================================
--- /dev/null
+++ clang/test/ClangScanDeps/Inputs/modules-pch-common-submodule/mod_tu.h
@@ -0,0 +1 @@
+#include "mod_common_sub.h"
Index: clang/test/ClangScanDeps/Inputs/modules-pch-common-submodule/cdb_tu.json
===================================================================
--- /dev/null
+++ clang/test/ClangScanDeps/Inputs/modules-pch-common-submodule/cdb_tu.json
@@ -0,0 +1,7 @@
+[
+ {
+ "directory": "DIR",
+ "command": "clang -fsyntax-only DIR/tu.c -fmodules -gmodules -fimplicit-module-maps -fmodules-cache-path=DIR/cache -include DIR/pch.h -o DIR/tu.o",
+ "file": "DIR/tu.c"
+ }
+]
Index: clang/test/ClangScanDeps/Inputs/modules-pch-common-submodule/cdb_pch.json
===================================================================
--- /dev/null
+++ clang/test/ClangScanDeps/Inputs/modules-pch-common-submodule/cdb_pch.json
@@ -0,0 +1,7 @@
+[
+ {
+ "directory": "DIR",
+ "command": "clang -x c-header DIR/pch.h -fmodules -gmodules -fimplicit-module-maps -fmodules-cache-path=DIR/cache -o DIR/pch.h.gch",
+ "file": "DIR/pch.h"
+ }
+]
Index: clang/lib/Tooling/DependencyScanning/ModuleDepCollector.cpp
===================================================================
--- clang/lib/Tooling/DependencyScanning/ModuleDepCollector.cpp
+++ clang/lib/Tooling/DependencyScanning/ModuleDepCollector.cpp
@@ -246,8 +246,8 @@
ModuleDeps &MD) {
for (const Module *Import : M->Imports)
if (Import->getTopLevelModule() != M->getTopLevelModule())
- if (MDC.isPrebuiltModule(Import))
- MD.PrebuiltModuleDeps.emplace_back(Import);
+ if (MDC.isPrebuiltModule(Import->getTopLevelModule()))
+ MD.PrebuiltModuleDeps.emplace_back(Import->getTopLevelModule());
}
void ModuleDepCollectorPP::addAllSubmoduleDeps(
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