configure_file: Add support for indented cmakedefine

Optional spaces and/or tabs are now understood between the '#' character
and the 'cmakedefine'/'cmakedefine01' words. This indentation is
preserved in the output lines.

Fixes: #13037

4 files changed, 30 insertions, 0 deletions

diff --git a/Tests/Complex/CMakeLists.txt b/Tests/Complex/CMakeLists.txt
index 075faa768c..8537cd99af 100644
--- a/Tests/Complex/CMakeLists.txt
+++ b/Tests/Complex/CMakeLists.txt
@@ -356,6 +356,8 @@ endwhile()
 
 set(SHOULD_BE_ZERO )
 set(SHOULD_BE_ONE 1)
+set(SHOULD_BE_ZERO_AND_INDENTED )
+set(SHOULD_BE_ONE_AND_INDENTED 1)
 
 # test elseif functionality, the mess below tries to catch problem
 # of clauses being executed early or late etc
diff --git a/Tests/Complex/Executable/complex.cxx b/Tests/Complex/Executable/complex.cxx
index 3b09229ba1..ca39870f23 100644
--- a/Tests/Complex/Executable/complex.cxx
+++ b/Tests/Complex/Executable/complex.cxx
@@ -261,6 +261,12 @@ int main()
   cmPassed("ONE_VAR is defined.");
 #endif
 
+#ifndef ONE_VAR_AND_INDENTED
+  cmFailed("cmakedefine is broken, ONE_VAR_AND_INDENTED is not defined.");
+#else
+  cmPassed("ONE_VAR_AND_INDENTED is defined.");
+#endif
+
 #ifndef ONE_VAR_IS_DEFINED
   cmFailed("cmakedefine, SET or VARIABLE_REQUIRES is broken, "
            "ONE_VAR_IS_DEFINED is not defined.");
@@ -274,6 +280,12 @@ int main()
   cmPassed("ZERO_VAR is not defined.");
 #endif
 
+#ifdef ZERO_VAR_AND_INDENTED
+  cmFailed("cmakedefine is broken, ZERO_VAR_AND_INDENTED is defined.");
+#else
+  cmPassed("ZERO_VAR_AND_INDENTED is not defined.");
+#endif
+
 #ifndef STRING_VAR
   cmFailed("the CONFIGURE_FILE command is broken, STRING_VAR is not defined.");
 #else
@@ -1030,6 +1042,16 @@ int main()
   } else {
     cmFailed("cmakedefine01 is not working for 1");
   }
+  if (SHOULD_BE_ZERO_AND_INDENTED == 0) {
+    cmPassed("cmakedefine01 is working for 0 and indented");
+  } else {
+    cmFailed("cmakedefine01 is not working for 0 and indented");
+  }
+  if (SHOULD_BE_ONE_AND_INDENTED == 1) {
+    cmPassed("cmakedefine01 is working for 1 and indented");
+  } else {
+    cmFailed("cmakedefine01 is not working for 1 and indented");
+  }
 #ifdef FORCE_TEST
   cmFailed("CMake SET CACHE FORCE");
 #else
diff --git a/Tests/Complex/VarTests.cmake b/Tests/Complex/VarTests.cmake
index 8be59be5ea..9761986ab9 100644
--- a/Tests/Complex/VarTests.cmake
+++ b/Tests/Complex/VarTests.cmake
@@ -2,6 +2,7 @@
 # Test SET
 #
 set (ZERO_VAR 0)
+set (ZERO_VAR_AND_INDENTED 0)
 set (ZERO_VAR2 0)
 
 if(ZERO_VAR)
@@ -11,6 +12,7 @@ else()
 endif()
 
 set(ONE_VAR 1)
+set(ONE_VAR_AND_INDENTED 1)
 set(ONE_VAR2 1)
 set(STRING_VAR "CMake is great" CACHE STRING "test a cache variable")
 
diff --git a/Tests/Complex/cmTestConfigure.h.in b/Tests/Complex/cmTestConfigure.h.in
index d7424b1845..72317bcc8f 100644
--- a/Tests/Complex/cmTestConfigure.h.in
+++ b/Tests/Complex/cmTestConfigure.h.in
@@ -1,8 +1,10 @@
 // Test SET, VARIABLE_REQUIRES
 
 #cmakedefine ONE_VAR
+#  cmakedefine ONE_VAR_AND_INDENTED
 #cmakedefine ONE_VAR_IS_DEFINED
 #cmakedefine ZERO_VAR
+#  cmakedefine ZERO_VAR_AND_INDENTED
 
 #define STRING_VAR "${STRING_VAR}"
 
@@ -32,6 +34,8 @@
 
 #cmakedefine01 SHOULD_BE_ZERO
 #cmakedefine01 SHOULD_BE_ONE
+#  cmakedefine01 SHOULD_BE_ZERO_AND_INDENTED
+#  cmakedefine01 SHOULD_BE_ONE_AND_INDENTED
 // Needed to check for files
 
 #define BINARY_DIR "${Complex_BINARY_DIR}"