Merge branch 'xcode-pch' into release-3.22

Merge-request: !7166

4 files changed, 25 insertions, 5 deletions

diff --git a/Source/cmLocalGenerator.cxx b/Source/cmLocalGenerator.cxx
index fc5e6e5f18..feea49f40f 100644
--- a/Source/cmLocalGenerator.cxx
+++ b/Source/cmLocalGenerator.cxx
@@ -2510,12 +2510,12 @@ void cmLocalGenerator::AddPchDependencies(cmGeneratorTarget* target)
     static const std::array<std::string, 4> langs = { { "C", "CXX", "OBJC",
                                                         "OBJCXX" } };
 
-    bool haveAnyPch = false;
+    std::set<std::string> pchLangSet;
     if (this->GetGlobalGenerator()->IsXcode()) {
       for (const std::string& lang : langs) {
         const std::string pchHeader = target->GetPchHeader(config, lang, "");
         if (!pchHeader.empty()) {
-          haveAnyPch = true;
+          pchLangSet.emplace(lang);
         }
       }
     }
@@ -2560,9 +2560,11 @@ void cmLocalGenerator::AddPchDependencies(cmGeneratorTarget* target)
         const std::string pchHeader = target->GetPchHeader(config, lang, arch);
 
         if (pchSource.empty() || pchHeader.empty()) {
-          if (this->GetGlobalGenerator()->IsXcode() && haveAnyPch) {
+          if (this->GetGlobalGenerator()->IsXcode() && !pchLangSet.empty()) {
             for (auto* sf : sources) {
-              sf->SetProperty("SKIP_PRECOMPILE_HEADERS", "ON");
+              if (pchLangSet.find(sf->GetLanguage()) == pchLangSet.end()) {
+                sf->SetProperty("SKIP_PRECOMPILE_HEADERS", "ON");
+              }
             }
           }
           continue;
diff --git a/Tests/RunCMake/PrecompileHeaders/PchIncludedOneLanguage.cmake b/Tests/RunCMake/PrecompileHeaders/PchIncludedOneLanguage.cmake
new file mode 100644
index 0000000000..dd582aca8c
--- /dev/null
+++ b/Tests/RunCMake/PrecompileHeaders/PchIncludedOneLanguage.cmake
@@ -0,0 +1,17 @@
+cmake_minimum_required(VERSION 3.16)
+project(PchIncludedAllLanguages C CXX)
+
+if(CMAKE_CXX_COMPILE_OPTIONS_USE_PCH)
+  add_definitions(-DHAVE_PCH_SUPPORT)
+endif()
+
+add_executable(main
+  main.cpp
+  empty.c
+  pch-included.cpp
+)
+
+target_precompile_headers(main PRIVATE $<$<COMPILE_LANGUAGE:CXX>:${CMAKE_CURRENT_SOURCE_DIR}/pch.h>)
+
+enable_testing()
+add_test(NAME main COMMAND main)
diff --git a/Tests/RunCMake/PrecompileHeaders/RunCMakeTest.cmake b/Tests/RunCMake/PrecompileHeaders/RunCMakeTest.cmake
index ca5b52e87c..29611aee9b 100644
--- a/Tests/RunCMake/PrecompileHeaders/RunCMakeTest.cmake
+++ b/Tests/RunCMake/PrecompileHeaders/RunCMakeTest.cmake
@@ -29,4 +29,5 @@ if(RunCMake_GENERATOR MATCHES "Make|Ninja")
 endif()
 run_test(PchReuseFromObjLib)
 run_test(PchIncludedAllLanguages)
+run_test(PchIncludedOneLanguage)
 run_test(PchLibObjLibExe)
diff --git a/Tests/RunCMake/RunCMake.cmake b/Tests/RunCMake/RunCMake.cmake
index 3363a579e0..5e66a521ec 100644
--- a/Tests/RunCMake/RunCMake.cmake
+++ b/Tests/RunCMake/RunCMake.cmake
@@ -157,7 +157,7 @@ function(run_cmake test)
     "|[^\n]*install_name_tool: warning: changes being made to the file will invalidate the code signature in:"
     "|[^\n]*xcodebuild[^\n]*DVTPlugInManager"
     "|[^\n]*xcodebuild[^\n]*warning: file type[^\n]*is based on missing file type"
-    "|[^\n]*objc[^\n]*: Class AMSupportURL[^\n]* One of the two will be used. Which one is undefined."
+    "|[^\n]*objc[^\n]*: Class [^\n]* One of the two will be used. Which one is undefined."
     "|[^\n]*is a member of multiple groups"
     "|[^\n]*offset in archive not a multiple of 8"
     "|[^\n]*from Time Machine by path"