try_compile: Record output location instead of reverse computing it

Fixes #23887, #23942, #20163, #18288

Source/cmCoreTryCompile.cxx

@@ -13,6 +13,7 @@
 #include <cmext/string_view>
 
 #include "cmsys/Directory.hxx"
+#include "cmsys/FStream.hxx"
 
 #include "cmArgumentParser.h"
 #include "cmExportTryCompileFileGenerator.h"
@@ -694,6 +695,17 @@ bool cmCoreTryCompile::TryCompileCode(Arguments& arguments,
     }
     fprintf(fout, ")\n");
 
+    /* Write out the output location of the target we are building */
+    std::string perConfigGenex;
+    if (this->Makefile->GetGlobalGenerator()->IsMultiConfig()) {
+      perConfigGenex = "_$<UPPER_CASE:$<CONFIG>>";
+    }
+    fprintf(fout,
+            "file(GENERATE OUTPUT "
+            "\"${CMAKE_BINARY_DIR}/%s%s_loc\"\n",
+            targetName.c_str(), perConfigGenex.c_str());
+    fprintf(fout, "     CONTENT $<TARGET_FILE:%s>)\n", targetName.c_str());
+
     bool warnCMP0067 = false;
     bool honorStandard = true;
 
@@ -935,7 +947,7 @@ bool cmCoreTryCompile::TryCompileCode(Arguments& arguments,
 
   if (this->SrcFileSignature) {
     std::string copyFileErrorMessage;
-    this->FindOutputFile(targetName, targetType);
+    this->FindOutputFile(targetName);
 
     if ((res == 0) && arguments.CopyFileTo) {
       std::string const& copyFile = *arguments.CopyFileTo;
@@ -1035,62 +1047,37 @@ void cmCoreTryCompile::CleanupFiles(std::string const& binDir)
   }
 }
 
-void cmCoreTryCompile::FindOutputFile(const std::string& targetName,
-                                      cmStateEnums::TargetType targetType)
+void cmCoreTryCompile::FindOutputFile(const std::string& targetName)
 {
   this->FindErrorMessage.clear();
   this->OutputFile.clear();
   std::string tmpOutputFile = "/";
-  if (targetType == cmStateEnums::EXECUTABLE) {
-    tmpOutputFile += targetName;
-    tmpOutputFile +=
-      this->Makefile->GetSafeDefinition("CMAKE_EXECUTABLE_SUFFIX");
-  } else // if (targetType == cmStateEnums::STATIC_LIBRARY)
-  {
-    tmpOutputFile +=
-      this->Makefile->GetSafeDefinition("CMAKE_STATIC_LIBRARY_PREFIX");
-    tmpOutputFile += targetName;
-    tmpOutputFile +=
-      this->Makefile->GetSafeDefinition("CMAKE_STATIC_LIBRARY_SUFFIX");
+  tmpOutputFile += targetName;
+
+  if (this->Makefile->GetGlobalGenerator()->IsMultiConfig()) {
+    tmpOutputFile += "_DEBUG";
+  }
+  tmpOutputFile += "_loc";
+
+  std::string command = cmStrCat(this->BinaryDirectory, tmpOutputFile);
+  if (!cmSystemTools::FileExists(command)) {
+    std::ostringstream emsg;
+    emsg << "Unable to find the recorded try_compile output location:\n";
+    emsg << cmStrCat("  ", command, "\n");
+    this->FindErrorMessage = emsg.str();
+    return;
   }
 
-  // a list of directories where to search for the compilation result
-  // at first directly in the binary dir
-  std::vector<std::string> searchDirs;
-  searchDirs.emplace_back();
-
-  cmValue config =
-    this->Makefile->GetDefinition("CMAKE_TRY_COMPILE_CONFIGURATION");
-  // if a config was specified try that first
-  if (cmNonempty(config)) {
-    std::string tmp = cmStrCat('/', *config);
-    searchDirs.emplace_back(std::move(tmp));
-  }
-  searchDirs.emplace_back("/Debug");
-
-  // handle app-bundles (for targeting apple-platforms)
-  std::string app = "/" + targetName + ".app";
-  if (cmNonempty(config)) {
-    std::string tmp = cmStrCat('/', *config, app);
-    searchDirs.emplace_back(std::move(tmp));
-  }
-  std::string tmp = "/Debug" + app;
-  searchDirs.emplace_back(std::move(tmp));
-  searchDirs.emplace_back(std::move(app));
-
-  searchDirs.emplace_back("/Development");
-
-  for (std::string const& sdir : searchDirs) {
-    std::string command = cmStrCat(this->BinaryDirectory, sdir, tmpOutputFile);
-    if (cmSystemTools::FileExists(command)) {
-      this->OutputFile = cmSystemTools::CollapseFullPath(command);
-      return;
-    }
+  std::string outputFileLocation;
+  cmsys::ifstream ifs(command.c_str());
+  cmSystemTools::GetLineFromStream(ifs, outputFileLocation);
+  if (!cmSystemTools::FileExists(outputFileLocation)) {
+    std::ostringstream emsg;
+    emsg << "Recorded try_compile output location doesn't exist:\n";
+    emsg << cmStrCat("  ", outputFileLocation, "\n");
+    this->FindErrorMessage = emsg.str();
+    return;
   }
 
-  std::ostringstream emsg;
-  emsg << "Unable to find the executable at any of:\n";
-  emsg << cmWrap("  " + this->BinaryDirectory, searchDirs, tmpOutputFile, "\n")
-       << "\n";
-  this->FindErrorMessage = emsg.str();
+  this->OutputFile = cmSystemTools::CollapseFullPath(outputFileLocation);
 }

Source/cmCoreTryCompile.h

@@ -94,8 +94,7 @@ public:
   TryCompileCode. The result is stored in OutputFile. If nothing is found,
   the error message is stored in FindErrorMessage.
    */
-  void FindOutputFile(const std::string& targetName,
-                      cmStateEnums::TargetType targetType);
+  void FindOutputFile(const std::string& targetName);
 
   std::string BinaryDirectory;
   std::string OutputFile;

Tests/RunCMake/Configure/CopyFileABI-override.cmake

@@ -1,5 +1,6 @@
 # Change the executable suffix that try_compile will use for
-# COPY_FILE but not inside the test project.  This forces failure.
+# COPY_FILE but not inside the test project, to verify
+# we can handle envs that try and break everything
 get_property(in_try_compile GLOBAL PROPERTY IN_TRY_COMPILE)
 if(NOT in_try_compile)
   set(CMAKE_EXECUTABLE_SUFFIX .missing)

Tests/RunCMake/Configure/CopyFileABI-stdout.txt

@@ -1,4 +1,4 @@
 -- Detecting C compiler ABI info
--- Detecting C compiler ABI info - failed.*
+-- Detecting C compiler ABI info - done.*
 -- Configuring done
 -- Generating done

Tests/RunCMake/Configure/CopyFileABI.cmake

@@ -1,2 +1,2 @@
-set(CMAKE_USER_MAKE_RULES_OVERRIDE_C ${CMAKE_CURRENT_SOURCE_DIR}/FailCopyFileABI-override.cmake)
+set(CMAKE_USER_MAKE_RULES_OVERRIDE_C ${CMAKE_CURRENT_SOURCE_DIR}/CopyFileABI-override.cmake)
 enable_language(C)

Tests/RunCMake/Configure/FailCopyFileABI-check.cmake

@@ -1,14 +0,0 @@
-set(log "${RunCMake_TEST_BINARY_DIR}/CMakeFiles/CMakeError.log")
-if(EXISTS "${log}")
-  file(READ "${log}" error_log)
-else()
-  set(error_log "")
-endif()
-string(REPLACE "\r\n" "\n" regex "Cannot copy output executable.*
-to destination specified by COPY_FILE:.*
-Unable to find the executable at any of:
-  .*\\.missing")
-if(NOT error_log MATCHES "${regex}")
-  string(REGEX REPLACE "\n" "\n  " error_log "  ${error_log}")
-  set(RunCMake_TEST_FAILED "Log file:\n ${log}\ndoes not have expected COPY_FILE failure message:\n${error_log}")
-endif()

Tests/RunCMake/Configure/RunCMakeTest.cmake

@@ -1,9 +1,9 @@
 include(RunCMake)
 
 run_cmake(ContinueAfterError)
+run_cmake(CopyFileABI)
 run_cmake(CustomTargetAfterError)
 run_cmake(ErrorLogs)
-run_cmake(FailCopyFileABI)
 
 # Use a single build tree for a few tests without cleaning.
 set(RunCMake_TEST_BINARY_DIR ${RunCMake_BINARY_DIR}/RerunCMake-build)

Tests/RunCMake/try_compile/BuildType.cmake

@@ -0,0 +1,6 @@
+enable_language(C)
+set(CMAKE_BUILD_TYPE RelWithDebInfo)
+
+try_compile(RESULT ${CMAKE_CURRENT_BINARY_DIR} ${CMAKE_CURRENT_SOURCE_DIR}/src.c
+  COPY_FILE "${CMAKE_CURRENT_BINARY_DIR}/out.bin"
+  )

Tests/RunCMake/try_compile/BuildTypeAsFlag.cmake

@@ -0,0 +1,7 @@
+enable_language(C)
+set(CMAKE_BUILD_TYPE RelWithDebInfo)
+
+try_compile(RESULT ${CMAKE_CURRENT_BINARY_DIR} ${CMAKE_CURRENT_SOURCE_DIR}/src.c
+  COPY_FILE "${CMAKE_CURRENT_BINARY_DIR}/out.bin"
+  CMAKE_FLAGS "-DCMAKE_BUILD_TYPE=Release"
+  )

Tests/RunCMake/try_compile/OutputDirAsFlag.cmake

@@ -0,0 +1,7 @@
+enable_language(C)
+set(CMAKE_BUILD_TYPE RelWithDebInfo)
+
+try_compile(RESULT ${CMAKE_CURRENT_BINARY_DIR} ${CMAKE_CURRENT_SOURCE_DIR}/src.c
+  COPY_FILE "${CMAKE_CURRENT_BINARY_DIR}/out.bin"
+  CMAKE_FLAGS "-DCMAKE_RUNTIME_OUTPUT_DIRECTORY=bin"
+  )

Tests/RunCMake/try_compile/old_and_new_signature_tests.cmake

@@ -11,6 +11,9 @@ run_cmake(BadSources2)
 run_cmake(EmptyValueArgs)
 run_cmake(EmptyListArgs)
 run_cmake(TryRunArgs)
+run_cmake(BuildType)
+run_cmake(BuildTypeAsFlag)
+run_cmake(OutputDirAsFlag)
 
 run_cmake(EnvConfig)