COMPILE_DEFINITIONS property: ensure leading -D is removed in all cases

Fixes: #24186

Help/command/add_compile_definitions.rst

@@ -21,6 +21,9 @@ Function-style definitions are not supported. CMake will automatically
 escape the value correctly for the native build system (note that CMake
 language syntax may require escapes to specify some values).
 
+.. versionadded:: 3.26
+  Any leading ``-D`` on an item will be removed.
+
 .. |command_name| replace:: ``add_compile_definitions``
 .. include:: GENEX_NOTE.txt
 

Help/prop_dir/COMPILE_DEFINITIONS.rst

@@ -19,6 +19,9 @@ directory's parent.
 CMake will automatically drop some definitions that are not supported
 by the native build tool.
 
+.. versionadded:: 3.26
+  Any leading ``-D`` on an item will be removed.
+
 .. include:: /include/COMPILE_DEFINITIONS_DISCLAIMER.txt
 
 Contents of ``COMPILE_DEFINITIONS`` may use "generator expressions" with

Help/prop_sf/COMPILE_DEFINITIONS.rst

@@ -16,6 +16,9 @@ CMake will automatically drop some definitions that are not supported
 by the native build tool.  Xcode does not support per-configuration
 definitions on source files.
 
+.. versionadded:: 3.26
+  Any leading ``-D`` on an item will be removed.
+
 .. include:: /include/COMPILE_DEFINITIONS_DISCLAIMER.txt
 
 Contents of ``COMPILE_DEFINITIONS`` may use :manual:`cmake-generator-expressions(7)`

Help/prop_tgt/COMPILE_DEFINITIONS.rst

@@ -13,6 +13,9 @@ values).
 CMake will automatically drop some definitions that are not supported
 by the native build tool.
 
+.. versionadded:: 3.26
+  Any leading ``-D`` on an item will be removed.
+
 .. include:: /include/COMPILE_DEFINITIONS_DISCLAIMER.txt
 
 Contents of ``COMPILE_DEFINITIONS`` may use "generator expressions" with the

Help/release/dev/COMPILE_DEFINITIONS-property-cleanup.rst

@@ -0,0 +1,6 @@
+COMPILE_DEFINITIONS-property-cleanup
+------------------------------------
+
+* For all ``COMPILE_DEFINITIONS`` properties, any leading ``-D`` on an item
+  will be removed regardless how to was defined: as is or inside a generator
+  expression.

Source/cmGlobalXCodeGenerator.cxx

@@ -4995,7 +4995,13 @@ void cmGlobalXCodeGenerator::AppendDefines(
   std::string def;
   for (auto const& define : defines) {
     // Start with -D if requested.
-    def = cmStrCat(dflag ? "-D" : "", define);
+    if (dflag && !cmHasLiteralPrefix(define, "-D")) {
+      def = cmStrCat("-D", define);
+    } else if (!dflag && cmHasLiteralPrefix(define, "-D")) {
+      def = define.substr(2);
+    } else {
+      def = define;
+    }
 
     // Append the flag with needed escapes.
     std::string tmp;

Source/cmLocalGenerator.cxx

@@ -3377,7 +3377,12 @@ void cmLocalGenerator::AppendDefines(
     if (!this->CheckDefinition(d.Value)) {
       continue;
     }
-    defines.insert(d);
+    // remove any leading -D
+    if (cmHasLiteralPrefix(d.Value, "-D")) {
+      defines.emplace(d.Value.substr(2), d.Backtrace);
+    } else {
+      defines.insert(d);
+    }
   }
 }
 

Tests/RunCMake/CMakeLists.txt

@@ -693,6 +693,7 @@ add_RunCMake_test(target_link_options -DCMAKE_C_COMPILER_ID=${CMAKE_C_COMPILER_I
 set_property(TEST RunCMake.target_link_options APPEND
   PROPERTY LABELS "CUDA")
 
+add_RunCMake_test(add_compile_definitions)
 add_RunCMake_test(target_compile_definitions)
 add_RunCMake_test(target_compile_features)
 add_RunCMake_test(target_compile_options

Tests/RunCMake/CompileDefinitions/RemoveLeadingMinusD.cmake

@@ -0,0 +1,11 @@
+
+enable_language(C)
+
+set_property(SOURCE foo.c PROPERTY COMPILE_DEFINITIONS -DDEF0 "$<1:-DDEF1>")
+
+add_library(lib1 foo.c)
+set_property(TARGET lib1 PROPERTY COMPILE_DEFINITIONS -DDEF2 "$<1:-DDEF3>")
+set_property(TARGET lib1 PROPERTY INTERFACE_COMPILE_DEFINITIONS -DDEF4 "$<1:-DDEF5>")
+
+add_library(lib2 foo.c)
+target_link_libraries(lib2 PRIVATE lib1)

Tests/RunCMake/CompileDefinitions/RunCMakeTest.cmake

@@ -1,3 +1,16 @@
 include(RunCMake)
 
 run_cmake(SetEmpty)
+
+
+macro(run_cmake_build test)
+  set(RunCMake_TEST_BINARY_DIR ${RunCMake_BINARY_DIR}/${test}-build)
+  set(RunCMake_TEST_NO_CLEAN 1)
+  run_cmake_command(${test} ${CMAKE_COMMAND} --build . --config Release)
+
+  unset(RunCMake_TEST_BINARY_DIR)
+  unset(RunCMake_TEST_NO_CLEAN)
+endmacro()
+
+run_cmake(RemoveLeadingMinusD)
+run_cmake_build(RemoveLeadingMinusD)

Tests/RunCMake/CompileDefinitions/foo.c

@@ -0,0 +1,4 @@
+
+void foo()
+{
+}

Tests/RunCMake/add_compile_definitions/CMakeLists.txt

@@ -0,0 +1,5 @@
+cmake_minimum_required(VERSION 3.11)
+
+project(${RunCMake_TEST} LANGUAGES NONE)
+
+include(${RunCMake_TEST}.cmake)

Tests/RunCMake/add_compile_definitions/RunCMakeTest.cmake

@@ -0,0 +1,13 @@
+include(RunCMake)
+
+macro(run_cmake_build test)
+  set(RunCMake_TEST_BINARY_DIR ${RunCMake_BINARY_DIR}/${test}-build)
+  set(RunCMake_TEST_NO_CLEAN 1)
+  run_cmake_command(${test} ${CMAKE_COMMAND} --build . --config Release)
+
+  unset(RunCMake_TEST_BINARY_DIR)
+  unset(RunCMake_TEST_NO_CLEAN)
+endmacro()
+
+run_cmake(remove_leading_minusD)
+run_cmake_build(remove_leading_minusD)

Tests/RunCMake/add_compile_definitions/foo.c

@@ -0,0 +1,4 @@
+
+void foo()
+{
+}

Tests/RunCMake/add_compile_definitions/remove_leading_minusD.cmake

@@ -0,0 +1,6 @@
+
+enable_language(C)
+
+add_compile_definitions(-DDEF0 "$<1:-DDEF1>")
+
+add_library(lib1 foo.c)

Tests/RunCMake/target_compile_definitions/RunCMakeTest.cmake

@@ -2,3 +2,16 @@ include(RunCMake)
 
 run_cmake(empty_keyword_args)
 run_cmake(unknown_imported_target)
+
+
+macro(run_cmake_build test)
+  set(RunCMake_TEST_BINARY_DIR ${RunCMake_BINARY_DIR}/${test}-build)
+  set(RunCMake_TEST_NO_CLEAN 1)
+  run_cmake_command(${test} ${CMAKE_COMMAND} --build . --config Release)
+
+  unset(RunCMake_TEST_BINARY_DIR)
+  unset(RunCMake_TEST_NO_CLEAN)
+endmacro()
+
+run_cmake(remove_leading_minusD)
+run_cmake_build(remove_leading_minusD)

Tests/RunCMake/target_compile_definitions/foo.c

@@ -0,0 +1,4 @@
+
+void foo()
+{
+}

Tests/RunCMake/target_compile_definitions/remove_leading_minusD.cmake

@@ -0,0 +1,9 @@
+
+enable_language(C)
+
+add_library(lib1 foo.c)
+target_compile_definitions(lib1 PRIVATE -DDEF0 "$<1:-DDEF1>")
+target_compile_definitions(lib1 PUBLIC -DDEF2 "$<1:-DDEF3>")
+
+add_library(lib2 foo.c)
+target_link_libraries(lib2 PRIVATE lib1)