Makefiles Generators: use compiler for dependencies generation

Each source compilation generates a dependencies file. These dependencies
files are consolidated in one file per target. This consolidation is done
as part of command 'cmake -E cmake_depends` launched before evaluation of
makefile dependency graph.

The consolidation uses the same approach as `CMake` dependencies management.

Fixes: #21321

4 files changed, 68 insertions, 0 deletions

diff --git a/Tests/RunCMake/BuildDepends/CompilerDependencies.cmake b/Tests/RunCMake/BuildDepends/CompilerDependencies.cmake
new file mode 100644
index 0000000..8a9e600
--- /dev/null
+++ b/Tests/RunCMake/BuildDepends/CompilerDependencies.cmake
@@ -0,0 +1,46 @@
+enable_language(C)
+
+add_executable(main ${CMAKE_CURRENT_BINARY_DIR}/main.c)
+
+file(GENERATE OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/check-$<LOWER_CASE:$<CONFIG>>.cmake CONTENT "
+set(check_pairs
+  \"$<TARGET_FILE:main>|${CMAKE_CURRENT_BINARY_DIR}/main.c\"
+  \"$<TARGET_FILE:main>|${CMAKE_CURRENT_BINARY_DIR}/main.h\"
+  )
+set(check_exes
+  \"$<TARGET_FILE:main>\"
+  )
+
+if (check_step EQUAL 2)
+  include(\"${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/Makefile.cmake\")
+  if (NOT CMAKE_DEPEND_INFO_FILES)
+    set(RunCMake_TEST_FAILED \"Variable CMAKE_DEPEND_INFO_FILES not found.\")
+  else()
+    include(\"${CMAKE_CURRENT_BINARY_DIR}/\${CMAKE_DEPEND_INFO_FILES}\")
+    if (NOT CMAKE_DEPENDS_DEPENDENCY_FILES)
+      set(RunCMake_TEST_FAILED \"Variable CMAKE_DEPENDS_DEPENDENCY_FILES not found.\")
+    else()
+      list(GET CMAKE_DEPENDS_DEPENDENCY_FILES 1 OBJECT_FILE)
+      list(GET CMAKE_DEPENDS_DEPENDENCY_FILES 3 DEP_FILE)
+      if (NOT EXISTS \"${CMAKE_CURRENT_BINARY_DIR}/\${DEP_FILE}\")
+        set(RunCMake_TEST_FAILED \"File \${DEP_FILE} not found.\")
+      else()
+        set (TARGET_DEP_FILE \"${CMAKE_CURRENT_BINARY_DIR}/\${DEP_FILE}\")
+        cmake_path(REPLACE_FILENAME TARGET_DEP_FILE \"compiler_depend.make\")
+        file(READ \"\${TARGET_DEP_FILE}\" DEPENDS_CONTENT)
+        if (WIN32)
+          string (REPLACE \"\\\\\" \"/\" DEPENDS_CONTENT \"\${DEPENDS_CONTENT}\")
+          string (TOLOWER \"\${DEPENDS_CONTENT}\" DEPENDS_CONTENT)
+          string (TOLOWER \"\${OBJECT_FILE}\" OBJECT_FILE)
+        else()
+          string(REPLACE \"\\\\ \" \" \" DEPENDS_CONTENT \"\${DEPENDS_CONTENT}\")
+        endif()
+        if(NOT DEPENDS_CONTENT MATCHES \"\${OBJECT_FILE} *:.+main.c\"
+            OR NOT DEPENDS_CONTENT MATCHES \"main.h\")
+          set(RunCMake_TEST_FAILED \"Dependency file '\${TARGET_DEP_FILE}' badly generated.\")
+        endif()
+      endif()
+    endif()
+  endif()
+endif()
+")
diff --git a/Tests/RunCMake/BuildDepends/CompilerDependencies.step1.cmake b/Tests/RunCMake/BuildDepends/CompilerDependencies.step1.cmake
new file mode 100644
index 0000000..1da2593
--- /dev/null
+++ b/Tests/RunCMake/BuildDepends/CompilerDependencies.step1.cmake
@@ -0,0 +1,9 @@
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/main.h" [[
+#define COUNT 1
+]])
+
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/main.c" [[
+#include "main.h"
+
+int main(void) { return COUNT; }
+]])
diff --git a/Tests/RunCMake/BuildDepends/CompilerDependencies.step2.cmake b/Tests/RunCMake/BuildDepends/CompilerDependencies.step2.cmake
new file mode 100644
index 0000000..e983665
--- /dev/null
+++ b/Tests/RunCMake/BuildDepends/CompilerDependencies.step2.cmake
@@ -0,0 +1,3 @@
+file(WRITE "${RunCMake_TEST_BINARY_DIR}/main.h" [[
+#define COUNT 2
+]])
diff --git a/Tests/RunCMake/BuildDepends/RunCMakeTest.cmake b/Tests/RunCMake/BuildDepends/RunCMakeTest.cmake
index 7a68c4b..23e222a 100644
--- a/Tests/RunCMake/BuildDepends/RunCMakeTest.cmake
+++ b/Tests/RunCMake/BuildDepends/RunCMakeTest.cmake
@@ -113,3 +113,13 @@ if(CMake_TEST_BuildDepends_GNU_AS)
   set(ENV{ASM} "${CMake_TEST_BuildDepends_GNU_AS}")
   run_BuildDepends(GNU-AS)
 endif()
+
+if ((RunCMake_GENERATOR STREQUAL "Unix Makefiles"
+      AND (CMAKE_C_COMPILER_ID STREQUAL "GNU"
+        OR CMAKE_C_COMPILER_ID STREQUAL "Clang"
+        OR CMAKE_C_COMPILER_ID STREQUAL "AppleClang"))
+    OR (RunCMake_GENERATOR STREQUAL "NMake Makefiles"
+      AND MSVC_VERSION GREATER 1300
+      AND CMAKE_C_COMPILER_ID STREQUAL "MSVC"))
+  run_BuildDepends(CompilerDependencies)
+endif()