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-rw-r--r--Modules/Compiler/Clang.cmake4
-rw-r--r--Modules/Compiler/GNU.cmake4
-rw-r--r--Modules/Compiler/IBMClang.cmake4
-rw-r--r--Modules/Compiler/IntelLLVM.cmake4
-rw-r--r--Modules/Compiler/LCC.cmake4
-rw-r--r--Source/cmCxxModuleMapper.cxx3
-rw-r--r--Source/cmCxxModuleMapper.h2
-rw-r--r--Source/cmGlobalNinjaGenerator.cxx10
-rw-r--r--Source/cmNinjaTargetGenerator.cxx17
-rw-r--r--Tests/CommandLength/CMakeLists.txt5
-rw-r--r--Tests/RunCMake/CXXModules/RunCMakeTest.cmake18
-rw-r--r--Tests/RunCMake/CXXModules/examples/depchain-collation-restat-rebuild-check.cmake12
-rw-r--r--Tests/RunCMake/CXXModules/examples/depchain-collation-restat/CMakeLists.txt23
-rw-r--r--Tests/RunCMake/CXXModules/examples/depchain-collation-restat/importable.cxx6
-rw-r--r--Tests/RunCMake/CXXModules/examples/depchain-collation-restat/main.cxx6
-rw-r--r--Tests/RunCMake/CXXModules/examples/depchain-collation-restat/pre-rebuild.cmake7
-rw-r--r--Tests/RunCMake/CXXModules/examples/depchain-modmap-rebuild-check.cmake11
-rw-r--r--Tests/RunCMake/CXXModules/examples/depchain-modmap/CMakeLists.txt18
-rw-r--r--Tests/RunCMake/CXXModules/examples/depchain-modmap/importable.cxx6
-rw-r--r--Tests/RunCMake/CXXModules/examples/depchain-modmap/main.cxx6
-rw-r--r--Tests/RunCMake/CXXModules/examples/depchain-modmap/pre-rebuild.cmake7
-rw-r--r--Tests/RunCMake/CXXModules/examples/depchain-modules-json-file-rebuild-check.cmake12
-rw-r--r--Tests/RunCMake/CXXModules/examples/depchain-modules-json-file/CMakeLists.txt23
-rw-r--r--Tests/RunCMake/CXXModules/examples/depchain-modules-json-file/importable.cxx6
-rw-r--r--Tests/RunCMake/CXXModules/examples/depchain-modules-json-file/main.cxx6
-rw-r--r--Tests/RunCMake/CXXModules/examples/depchain-modules-json-file/pre-rebuild.cmake7
26 files changed, 213 insertions, 18 deletions
diff --git a/Modules/Compiler/Clang.cmake b/Modules/Compiler/Clang.cmake
index 4f8a9b7..2452d5e 100644
--- a/Modules/Compiler/Clang.cmake
+++ b/Modules/Compiler/Clang.cmake
@@ -95,11 +95,11 @@ else()
endif()
set(CMAKE_${lang}_ARCHIVE_CREATE_IPO
- "\"${__ar}\" cr <TARGET> <LINK_FLAGS> <OBJECTS>"
+ "\"${__ar}\" qc <TARGET> <LINK_FLAGS> <OBJECTS>"
)
set(CMAKE_${lang}_ARCHIVE_APPEND_IPO
- "\"${__ar}\" r <TARGET> <LINK_FLAGS> <OBJECTS>"
+ "\"${__ar}\" q <TARGET> <LINK_FLAGS> <OBJECTS>"
)
set(CMAKE_${lang}_ARCHIVE_FINISH_IPO
diff --git a/Modules/Compiler/GNU.cmake b/Modules/Compiler/GNU.cmake
index 88c8997..138bb4b 100644
--- a/Modules/Compiler/GNU.cmake
+++ b/Modules/Compiler/GNU.cmake
@@ -168,11 +168,11 @@ macro(__compiler_gnu lang)
#
# [1]: https://gcc.gnu.org/onlinedocs/gcc-4.9.4/gcc/Optimize-Options.html
set(CMAKE_${lang}_ARCHIVE_CREATE_IPO
- "\"${CMAKE_${lang}_COMPILER_AR}\" cr <TARGET> <LINK_FLAGS> <OBJECTS>"
+ "\"${CMAKE_${lang}_COMPILER_AR}\" qc <TARGET> <LINK_FLAGS> <OBJECTS>"
)
set(CMAKE_${lang}_ARCHIVE_APPEND_IPO
- "\"${CMAKE_${lang}_COMPILER_AR}\" r <TARGET> <LINK_FLAGS> <OBJECTS>"
+ "\"${CMAKE_${lang}_COMPILER_AR}\" q <TARGET> <LINK_FLAGS> <OBJECTS>"
)
set(CMAKE_${lang}_ARCHIVE_FINISH_IPO
diff --git a/Modules/Compiler/IBMClang.cmake b/Modules/Compiler/IBMClang.cmake
index 169a0f0..a43f788 100644
--- a/Modules/Compiler/IBMClang.cmake
+++ b/Modules/Compiler/IBMClang.cmake
@@ -58,11 +58,11 @@ macro(__compiler_ibmclang lang)
set(__ranlib "${CMAKE_${lang}_COMPILER_RANLIB}")
set(CMAKE_${lang}_ARCHIVE_CREATE_IPO
- "\"${__ar}\" cr <TARGET> <LINK_FLAGS> <OBJECTS>"
+ "\"${__ar}\" qc <TARGET> <LINK_FLAGS> <OBJECTS>"
)
set(CMAKE_${lang}_ARCHIVE_APPEND_IPO
- "\"${__ar}\" r <TARGET> <LINK_FLAGS> <OBJECTS>"
+ "\"${__ar}\" q <TARGET> <LINK_FLAGS> <OBJECTS>"
)
set(CMAKE_${lang}_ARCHIVE_FINISH_IPO
diff --git a/Modules/Compiler/IntelLLVM.cmake b/Modules/Compiler/IntelLLVM.cmake
index a58128a..5afb1ce 100644
--- a/Modules/Compiler/IntelLLVM.cmake
+++ b/Modules/Compiler/IntelLLVM.cmake
@@ -19,8 +19,8 @@ set(__pch_header_OBJCXX "objective-c++-header")
macro(__compiler_intel_llvm_common lang)
set(_CMAKE_${lang}_IPO_SUPPORTED_BY_CMAKE YES)
set(_CMAKE_${lang}_IPO_MAY_BE_SUPPORTED_BY_COMPILER YES)
- set(CMAKE_${lang}_ARCHIVE_CREATE_IPO "\"${CMAKE_${lang}_COMPILER_AR}\" cr <TARGET> <LINK_FLAGS> <OBJECTS>")
- set(CMAKE_${lang}_ARCHIVE_APPEND_IPO "\"${CMAKE_${lang}_COMPILER_AR}\" r <TARGET> <LINK_FLAGS> <OBJECTS>")
+ set(CMAKE_${lang}_ARCHIVE_CREATE_IPO "\"${CMAKE_${lang}_COMPILER_AR}\" qc <TARGET> <LINK_FLAGS> <OBJECTS>")
+ set(CMAKE_${lang}_ARCHIVE_APPEND_IPO "\"${CMAKE_${lang}_COMPILER_AR}\" q <TARGET> <LINK_FLAGS> <OBJECTS>")
set(CMAKE_${lang}_ARCHIVE_FINISH_IPO "\"${CMAKE_${lang}_COMPILER_RANLIB}\" <TARGET>")
endmacro()
diff --git a/Modules/Compiler/LCC.cmake b/Modules/Compiler/LCC.cmake
index f8c2084..2892ec6 100644
--- a/Modules/Compiler/LCC.cmake
+++ b/Modules/Compiler/LCC.cmake
@@ -65,11 +65,11 @@ macro(__compiler_lcc lang)
set(CMAKE_${lang}_COMPILE_OPTIONS_IPO ${__lto_flags})
set(CMAKE_${lang}_ARCHIVE_CREATE_IPO
- "\"${CMAKE_${lang}_COMPILER_AR}\" cr <TARGET> <LINK_FLAGS> <OBJECTS>"
+ "\"${CMAKE_${lang}_COMPILER_AR}\" qc <TARGET> <LINK_FLAGS> <OBJECTS>"
)
set(CMAKE_${lang}_ARCHIVE_APPEND_IPO
- "\"${CMAKE_${lang}_COMPILER_AR}\" r <TARGET> <LINK_FLAGS> <OBJECTS>"
+ "\"${CMAKE_${lang}_COMPILER_AR}\" q <TARGET> <LINK_FLAGS> <OBJECTS>"
)
set(CMAKE_${lang}_ARCHIVE_FINISH_IPO
diff --git a/Source/cmCxxModuleMapper.cxx b/Source/cmCxxModuleMapper.cxx
index f45c011..b6b9540 100644
--- a/Source/cmCxxModuleMapper.cxx
+++ b/Source/cmCxxModuleMapper.cxx
@@ -305,7 +305,7 @@ cm::static_string_view CxxModuleMapExtension(
std::set<std::string> CxxModuleUsageSeed(
CxxModuleLocations const& loc, std::vector<cmScanDepInfo> const& objects,
- CxxModuleUsage& usages)
+ CxxModuleUsage& usages, bool& private_usage_found)
{
// Track inner usages to populate usages from internal bits.
//
@@ -334,6 +334,7 @@ std::set<std::string> CxxModuleUsageSeed(
cmStrCat("Unable to use module '", r.LogicalName,
"' as it is 'PRIVATE' and therefore not accessible outside "
"of its owning target."));
+ private_usage_found = true;
continue;
}
diff --git a/Source/cmCxxModuleMapper.h b/Source/cmCxxModuleMapper.h
index 34111f7..c785099 100644
--- a/Source/cmCxxModuleMapper.h
+++ b/Source/cmCxxModuleMapper.h
@@ -93,7 +93,7 @@ cm::static_string_view CxxModuleMapExtension(
// import cycle).
std::set<std::string> CxxModuleUsageSeed(
CxxModuleLocations const& loc, std::vector<cmScanDepInfo> const& objects,
- CxxModuleUsage& usages);
+ CxxModuleUsage& usages, bool& private_usage_found);
// Return the contents of the module map in the given format for the
// object file.
diff --git a/Source/cmGlobalNinjaGenerator.cxx b/Source/cmGlobalNinjaGenerator.cxx
index 74a6bea..f018a8c 100644
--- a/Source/cmGlobalNinjaGenerator.cxx
+++ b/Source/cmGlobalNinjaGenerator.cxx
@@ -2742,7 +2742,9 @@ bool cmGlobalNinjaGenerator::WriteDyndepFile(
// Insert information about the current target's modules.
if (modmap_fmt) {
- auto cycle_modules = CxxModuleUsageSeed(locs, objects, usages);
+ bool private_usage_found = false;
+ auto cycle_modules =
+ CxxModuleUsageSeed(locs, objects, usages, private_usage_found);
if (!cycle_modules.empty()) {
cmSystemTools::Error(
cmStrCat("Circular dependency detected in the C++ module import "
@@ -2750,6 +2752,10 @@ bool cmGlobalNinjaGenerator::WriteDyndepFile(
cmJoin(cycle_modules, R"(", ")"_s), '"'));
return false;
}
+ if (private_usage_found) {
+ // Already errored in the function.
+ return false;
+ }
}
cmNinjaBuild build("dyndep");
@@ -2786,6 +2792,7 @@ bool cmGlobalNinjaGenerator::WriteDyndepFile(
// `cmNinjaTargetGenerator::ExportObjectCompileCommand` to generate the
// corresponding file path.
cmGeneratedFileStream mmf(cmStrCat(object.PrimaryOutput, ".modmap"));
+ mmf.SetCopyIfDifferent(true);
mmf << mm;
}
@@ -2875,6 +2882,7 @@ bool cmGlobalNinjaGenerator::WriteDyndepFile(
}
cmGeneratedFileStream tmf(target_mods_file);
+ tmf.SetCopyIfDifferent(true);
tmf << target_module_info;
cmDyndepMetadataCallbacks cb;
diff --git a/Source/cmNinjaTargetGenerator.cxx b/Source/cmNinjaTargetGenerator.cxx
index 45ed0ab..a465b08 100644
--- a/Source/cmNinjaTargetGenerator.cxx
+++ b/Source/cmNinjaTargetGenerator.cxx
@@ -815,6 +815,11 @@ void cmNinjaTargetGenerator::WriteCompileRule(const std::string& lang,
// dyndep rules
rule.RspFile = "$out.rsp";
rule.RspContent = "$in";
+ // Ninja's collator writes all outputs using `cmGeneratedFileStream`, so
+ // they are only updated if contents actually change. Avoid running
+ // dependent jobs if the contents don't change by telling `ninja` to check
+ // the timestamp again.
+ rule.Restat = "1";
// Run CMake dependency scanner on the source file (using the preprocessed
// source if that was performed).
@@ -1222,11 +1227,13 @@ void cmNinjaTargetGenerator::WriteObjectBuildStatements(
cmNinjaBuild build(this->LanguageDyndepRule(language, config));
build.Outputs.push_back(this->GetDyndepFilePath(language, config));
- build.ImplicitOuts.push_back(
+ build.ImplicitOuts.emplace_back(
cmStrCat(this->Makefile->GetCurrentBinaryDirectory(), '/',
this->LocalGenerator->GetTargetDirectory(this->GeneratorTarget),
this->GetGlobalGenerator()->ConfigDirectory(config), '/',
language, "Modules.json"));
+ build.ImplicitDeps.emplace_back(
+ this->GetTargetDependInfoPath(language, config));
for (auto const& scanFiles : scanningFiles) {
if (!scanFiles.ScanningOutput.empty()) {
build.ExplicitDeps.push_back(scanFiles.ScanningOutput);
@@ -1241,10 +1248,12 @@ void cmNinjaTargetGenerator::WriteObjectBuildStatements(
auto const linked_directories =
this->GetLinkedTargetDirectories(language, config);
for (std::string const& l : linked_directories.Direct) {
- build.ImplicitDeps.push_back(cmStrCat(l, '/', language, "Modules.json"));
+ build.ImplicitDeps.emplace_back(
+ cmStrCat(l, '/', language, "Modules.json"));
}
for (std::string const& l : linked_directories.Forward) {
- build.ImplicitDeps.push_back(cmStrCat(l, '/', language, "Modules.json"));
+ build.ImplicitDeps.emplace_back(
+ cmStrCat(l, '/', language, "Modules.json"));
}
this->GetGlobalGenerator()->WriteBuild(this->GetImplFileStream(fileConfig),
@@ -1639,7 +1648,7 @@ void cmNinjaTargetGenerator::WriteObjectBuildStatement(
// corresponding file path.
std::string ddModmapFile = cmStrCat(objectFileName, ".modmap");
vars["DYNDEP_MODULE_MAP_FILE"] = ddModmapFile;
- objBuild.OrderOnlyDeps.push_back(ddModmapFile);
+ objBuild.ImplicitDeps.push_back(ddModmapFile);
scanningFiles.ModuleMapFile = std::move(ddModmapFile);
}
diff --git a/Tests/CommandLength/CMakeLists.txt b/Tests/CommandLength/CMakeLists.txt
index 6836051..8d75172 100644
--- a/Tests/CommandLength/CMakeLists.txt
+++ b/Tests/CommandLength/CMakeLists.txt
@@ -10,7 +10,10 @@ set(msg "${msg} ${msg}")
set(msg "${msg} ${msg}")
set(msg "${msg} ${msg}")
set(msg "${msg} ${msg}")
-foreach(i RANGE 1 1000)
+set(msg "${msg} ${msg}")
+set(msg "${msg} ${msg}")
+set(msg "${msg} ${msg}")
+foreach(i RANGE 1 125)
add_custom_command(TARGET CommandLength POST_BUILD VERBATIM
COMMAND ${CMAKE_COMMAND} -E echo "${i} ${msg}" > log/${i}
)
diff --git a/Tests/RunCMake/CXXModules/RunCMakeTest.cmake b/Tests/RunCMake/CXXModules/RunCMakeTest.cmake
index 2a93aeb..421c509 100644
--- a/Tests/RunCMake/CXXModules/RunCMakeTest.cmake
+++ b/Tests/RunCMake/CXXModules/RunCMakeTest.cmake
@@ -147,6 +147,12 @@ function (run_cxx_module_test directory)
if (NOT RunCMake_CXXModules_NO_TEST)
run_cmake_command("examples/${test_name}-test" "${CMAKE_CTEST_COMMAND}" -C Debug --output-on-failure)
endif ()
+ if (RunCMake_CXXModules_REBUILD)
+ execute_process(COMMAND ${CMAKE_COMMAND} -E sleep 1.125) # handle 1s resolution
+ include("${RunCMake_TEST_SOURCE_DIR}/pre-rebuild.cmake")
+ execute_process(COMMAND ${CMAKE_COMMAND} -E sleep 1.125) # handle 1s resolution
+ run_cmake_command("examples/${test_name}-rebuild" "${CMAKE_COMMAND}" --build . --config Debug)
+ endif ()
endfunction ()
function (run_cxx_module_test_target directory target)
@@ -155,6 +161,13 @@ function (run_cxx_module_test_target directory target)
run_cxx_module_test("${directory}" ${ARGN})
endfunction ()
+function (run_cxx_module_test_rebuild directory)
+ set(RunCMake_CXXModules_INSTALL 0)
+ set(RunCMake_CXXModules_NO_TEST 1)
+ set(RunCMake_CXXModules_REBUILD 1)
+ run_cxx_module_test("${directory}" ${ARGN})
+endfunction ()
+
string(REPLACE "," ";" CMake_TEST_MODULE_COMPILATION "${CMake_TEST_MODULE_COMPILATION}")
if (RunCMake_GENERATOR MATCHES "Ninja")
@@ -202,6 +215,11 @@ if ("collation" IN_LIST CMake_TEST_MODULE_COMPILATION)
set(RunCMake_CXXModules_NO_TEST 1)
run_cxx_module_test(req-private-other-target)
unset(RunCMake_CXXModules_NO_TEST)
+ run_cxx_module_test_rebuild(depchain-modmap)
+ run_cxx_module_test_rebuild(depchain-modules-json-file)
+ if (RunCMake_GENERATOR MATCHES "Ninja")
+ run_cxx_module_test_rebuild(depchain-collation-restat)
+ endif ()
endif ()
# Tests which use named modules in shared libraries.
diff --git a/Tests/RunCMake/CXXModules/examples/depchain-collation-restat-rebuild-check.cmake b/Tests/RunCMake/CXXModules/examples/depchain-collation-restat-rebuild-check.cmake
new file mode 100644
index 0000000..46c1d29
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/depchain-collation-restat-rebuild-check.cmake
@@ -0,0 +1,12 @@
+if (RunCMake_GENERATOR_IS_MULTI_CONFIG)
+ set(dep_collation_restat "CMakeFiles/depchain_collation_restat.dir/Debug/main.cxx${CMAKE_CXX_OUTPUT_EXTENSION}")
+ set(collation_restat "CMakeFiles/depchain_with_collation_restat.dir/Debug/CXXModules.json")
+else ()
+ set(dep_collation_restat "CMakeFiles/depchain_collation_restat.dir/main.cxx${CMAKE_CXX_OUTPUT_EXTENSION}")
+ set(collation_restat "CMakeFiles/depchain_with_collation_restat.dir/CXXModules.json")
+endif ()
+
+if (NOT "${RunCMake_TEST_BINARY_DIR}/${collation_restat}" IS_NEWER_THAN "${RunCMake_TEST_BINARY_DIR}/${dep_collation_restat}")
+ list(APPEND RunCMake_TEST_FAILED
+ "Object '${dep_collation_restat}' should not have recompiled if '${collation_restat}' did not change content.")
+endif ()
diff --git a/Tests/RunCMake/CXXModules/examples/depchain-collation-restat/CMakeLists.txt b/Tests/RunCMake/CXXModules/examples/depchain-collation-restat/CMakeLists.txt
new file mode 100644
index 0000000..54df83a
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/depchain-collation-restat/CMakeLists.txt
@@ -0,0 +1,23 @@
+cmake_minimum_required(VERSION 3.28)
+project(cxx_modules_depchain_collation_restat CXX)
+
+include("${CMAKE_SOURCE_DIR}/../cxx-modules-rules.cmake")
+
+add_library(depchain_with_collation_restat)
+target_sources(depchain_with_collation_restat
+ PUBLIC
+ FILE_SET CXX_MODULES
+ BASE_DIRS
+ "${CMAKE_CURRENT_SOURCE_DIR}"
+ FILES
+ importable.cxx)
+target_compile_features(depchain_with_collation_restat PUBLIC cxx_std_20)
+
+add_executable(depchain_collation_restat)
+target_sources(depchain_collation_restat
+ PRIVATE
+ main.cxx)
+target_link_libraries(depchain_collation_restat
+ PRIVATE
+ depchain_with_collation_restat)
+add_test(NAME depchain_collation_restat COMMAND depchain_collation_restat)
diff --git a/Tests/RunCMake/CXXModules/examples/depchain-collation-restat/importable.cxx b/Tests/RunCMake/CXXModules/examples/depchain-collation-restat/importable.cxx
new file mode 100644
index 0000000..607680a
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/depchain-collation-restat/importable.cxx
@@ -0,0 +1,6 @@
+export module importable;
+
+export int from_import()
+{
+ return 0;
+}
diff --git a/Tests/RunCMake/CXXModules/examples/depchain-collation-restat/main.cxx b/Tests/RunCMake/CXXModules/examples/depchain-collation-restat/main.cxx
new file mode 100644
index 0000000..feb38d2
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/depchain-collation-restat/main.cxx
@@ -0,0 +1,6 @@
+import importable;
+
+int main(int argc, char* argv[])
+{
+ return from_import();
+}
diff --git a/Tests/RunCMake/CXXModules/examples/depchain-collation-restat/pre-rebuild.cmake b/Tests/RunCMake/CXXModules/examples/depchain-collation-restat/pre-rebuild.cmake
new file mode 100644
index 0000000..e1ff979
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/depchain-collation-restat/pre-rebuild.cmake
@@ -0,0 +1,7 @@
+if (RunCMake_GENERATOR_IS_MULTI_CONFIG)
+ set(collation_restat "CMakeFiles/depchain_with_collation_restat.dir/Debug/CXXModules.json")
+else ()
+ set(collation_restat "CMakeFiles/depchain_with_collation_restat.dir/CXXModules.json")
+endif ()
+
+file(TOUCH_NOCREATE "${RunCMake_TEST_BINARY_DIR}/${collation_restat}")
diff --git a/Tests/RunCMake/CXXModules/examples/depchain-modmap-rebuild-check.cmake b/Tests/RunCMake/CXXModules/examples/depchain-modmap-rebuild-check.cmake
new file mode 100644
index 0000000..1596632
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/depchain-modmap-rebuild-check.cmake
@@ -0,0 +1,11 @@
+if (RunCMake_GENERATOR_IS_MULTI_CONFIG)
+ set(object_path "CMakeFiles/depchain_modmap.dir/Debug/main.cxx${CMAKE_CXX_OUTPUT_EXTENSION}")
+else ()
+ set(object_path "CMakeFiles/depchain_modmap.dir/main.cxx${CMAKE_CXX_OUTPUT_EXTENSION}")
+endif ()
+set(modmap_path "${object_path}.modmap")
+
+if ("${RunCMake_TEST_BINARY_DIR}/${modmap_path}" IS_NEWER_THAN "${RunCMake_TEST_BINARY_DIR}/${object_path}")
+ list(APPEND RunCMake_TEST_FAILED
+ "Object '${object_path}' should have recompiled if '${modmap_path}' changed.")
+endif ()
diff --git a/Tests/RunCMake/CXXModules/examples/depchain-modmap/CMakeLists.txt b/Tests/RunCMake/CXXModules/examples/depchain-modmap/CMakeLists.txt
new file mode 100644
index 0000000..11712e9
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/depchain-modmap/CMakeLists.txt
@@ -0,0 +1,18 @@
+cmake_minimum_required(VERSION 3.28)
+project(cxx_modules_depchain_modmap CXX)
+
+include("${CMAKE_SOURCE_DIR}/../cxx-modules-rules.cmake")
+
+add_executable(depchain_modmap)
+target_sources(depchain_modmap
+ PRIVATE
+ main.cxx
+ PRIVATE
+ FILE_SET CXX_MODULES
+ BASE_DIRS
+ "${CMAKE_CURRENT_SOURCE_DIR}"
+ FILES
+ importable.cxx)
+target_compile_features(depchain_modmap PUBLIC cxx_std_20)
+
+add_test(NAME depchain_modmap COMMAND depchain_modmap)
diff --git a/Tests/RunCMake/CXXModules/examples/depchain-modmap/importable.cxx b/Tests/RunCMake/CXXModules/examples/depchain-modmap/importable.cxx
new file mode 100644
index 0000000..607680a
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/depchain-modmap/importable.cxx
@@ -0,0 +1,6 @@
+export module importable;
+
+export int from_import()
+{
+ return 0;
+}
diff --git a/Tests/RunCMake/CXXModules/examples/depchain-modmap/main.cxx b/Tests/RunCMake/CXXModules/examples/depchain-modmap/main.cxx
new file mode 100644
index 0000000..feb38d2
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/depchain-modmap/main.cxx
@@ -0,0 +1,6 @@
+import importable;
+
+int main(int argc, char* argv[])
+{
+ return from_import();
+}
diff --git a/Tests/RunCMake/CXXModules/examples/depchain-modmap/pre-rebuild.cmake b/Tests/RunCMake/CXXModules/examples/depchain-modmap/pre-rebuild.cmake
new file mode 100644
index 0000000..f434cbe
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/depchain-modmap/pre-rebuild.cmake
@@ -0,0 +1,7 @@
+if (RunCMake_GENERATOR_IS_MULTI_CONFIG)
+ set(modmap_path "CMakeFiles/depchain_modmap.dir/Debug/main.cxx${CMAKE_CXX_OUTPUT_EXTENSION}.modmap")
+else ()
+ set(modmap_path "CMakeFiles/depchain_modmap.dir/main.cxx${CMAKE_CXX_OUTPUT_EXTENSION}.modmap")
+endif ()
+
+file(TOUCH_NOCREATE "${RunCMake_TEST_BINARY_DIR}/${modmap_path}")
diff --git a/Tests/RunCMake/CXXModules/examples/depchain-modules-json-file-rebuild-check.cmake b/Tests/RunCMake/CXXModules/examples/depchain-modules-json-file-rebuild-check.cmake
new file mode 100644
index 0000000..94e833a
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/depchain-modules-json-file-rebuild-check.cmake
@@ -0,0 +1,12 @@
+if (RunCMake_GENERATOR_IS_MULTI_CONFIG)
+ set(dep_modules_json_path "CMakeFiles/depchain_modules_json_file.dir/Debug/CXX.dd")
+ set(modules_json_path "CMakeFiles/depchain_with_modules_json_file.dir/Debug/CXXModules.json")
+else ()
+ set(dep_modules_json_path "CMakeFiles/depchain_modules_json_file.dir/CXX.dd")
+ set(modules_json_path "CMakeFiles/depchain_with_modules_json_file.dir/CXXModules.json")
+endif ()
+
+if ("${RunCMake_TEST_BINARY_DIR}/${modules_json_path}" IS_NEWER_THAN "${RunCMake_TEST_BINARY_DIR}/${dep_modules_json_path}")
+ list(APPEND RunCMake_TEST_FAILED
+ "Object '${dep_modules_json_path}' should have recompiled if '${modules_json_path}' changed.")
+endif ()
diff --git a/Tests/RunCMake/CXXModules/examples/depchain-modules-json-file/CMakeLists.txt b/Tests/RunCMake/CXXModules/examples/depchain-modules-json-file/CMakeLists.txt
new file mode 100644
index 0000000..9828ee6
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/depchain-modules-json-file/CMakeLists.txt
@@ -0,0 +1,23 @@
+cmake_minimum_required(VERSION 3.28)
+project(cxx_modules_depchain_modules_json_file CXX)
+
+include("${CMAKE_SOURCE_DIR}/../cxx-modules-rules.cmake")
+
+add_library(depchain_with_modules_json_file)
+target_sources(depchain_with_modules_json_file
+ PUBLIC
+ FILE_SET CXX_MODULES
+ BASE_DIRS
+ "${CMAKE_CURRENT_SOURCE_DIR}"
+ FILES
+ importable.cxx)
+target_compile_features(depchain_with_modules_json_file PUBLIC cxx_std_20)
+
+add_executable(depchain_modules_json_file)
+target_sources(depchain_modules_json_file
+ PRIVATE
+ main.cxx)
+target_link_libraries(depchain_modules_json_file
+ PRIVATE
+ depchain_with_modules_json_file)
+add_test(NAME depchain_modules_json_file COMMAND depchain_modules_json_file)
diff --git a/Tests/RunCMake/CXXModules/examples/depchain-modules-json-file/importable.cxx b/Tests/RunCMake/CXXModules/examples/depchain-modules-json-file/importable.cxx
new file mode 100644
index 0000000..607680a
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/depchain-modules-json-file/importable.cxx
@@ -0,0 +1,6 @@
+export module importable;
+
+export int from_import()
+{
+ return 0;
+}
diff --git a/Tests/RunCMake/CXXModules/examples/depchain-modules-json-file/main.cxx b/Tests/RunCMake/CXXModules/examples/depchain-modules-json-file/main.cxx
new file mode 100644
index 0000000..feb38d2
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/depchain-modules-json-file/main.cxx
@@ -0,0 +1,6 @@
+import importable;
+
+int main(int argc, char* argv[])
+{
+ return from_import();
+}
diff --git a/Tests/RunCMake/CXXModules/examples/depchain-modules-json-file/pre-rebuild.cmake b/Tests/RunCMake/CXXModules/examples/depchain-modules-json-file/pre-rebuild.cmake
new file mode 100644
index 0000000..9c3f2ff
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/examples/depchain-modules-json-file/pre-rebuild.cmake
@@ -0,0 +1,7 @@
+if (RunCMake_GENERATOR_IS_MULTI_CONFIG)
+ set(modules_json_path "CMakeFiles/depchain_with_modules_json_file.dir/Debug/CXXModules.json")
+else ()
+ set(modules_json_path "CMakeFiles/depchain_with_modules_json_file.dir/CXXModules.json")
+endif ()
+
+file(TOUCH_NOCREATE "${RunCMake_TEST_BINARY_DIR}/${modules_json_path}")