Tests: Cover rebuild with multiple custom command outputs (#15116)

Extend the BuildDepends test with a case covering multiple custom
command outputs with the second one consumed by another rule.  With the
old "multiple output pair" infrastructure used in the Makefile and Xcode
generators this did not work.  Now that it is fixed, test the case
explicitly.

2 files changed, 41 insertions, 0 deletions

diff --git a/Tests/BuildDepends/CMakeLists.txt b/Tests/BuildDepends/CMakeLists.txt
index 6209bb8..78e9e17 100644
--- a/Tests/BuildDepends/CMakeLists.txt
+++ b/Tests/BuildDepends/CMakeLists.txt
@@ -65,6 +65,7 @@ file(WRITE ${BuildDepends_BINARY_DIR}/Project/link_depends_no_shared_exe.h
 set(link_depends_no_shared_check_txt ${BuildDepends_BINARY_DIR}/Project/link_depends_no_shared_check.txt)
 
 file(WRITE ${BuildDepends_BINARY_DIR}/Project/external.in "external original\n")
+file(WRITE ${BuildDepends_BINARY_DIR}/Project/multi1-in.txt "multi1-in original\n")
 
 help_xcode_depends()
 
@@ -177,6 +178,19 @@ else()
     "external.out is missing")
 endif()
 
+if(EXISTS ${BuildDepends_BINARY_DIR}/Project/multi1-out2-copy.txt)
+  file(STRINGS ${BuildDepends_BINARY_DIR}/Project/multi1-out2-copy.txt multi1_out)
+  if("${multi1_out}" STREQUAL "multi1-in original")
+    message(STATUS "multi1-out2-copy.txt contains '${multi1_out}'")
+  else()
+    message(SEND_ERROR "Project did not initially build properly: "
+      "multi1-out2-copy.txt contains '${multi1_out}'")
+  endif()
+else()
+  message(SEND_ERROR "Project did not initially build properly: "
+    "multi1-out2-copy.txt is missing")
+endif()
+
 message("Waiting 3 seconds...")
 execute_process(COMMAND ${CMAKE_COMMAND} -E sleep 3)
 
@@ -202,6 +216,7 @@ if(TEST_LINK_DEPENDS)
 endif()
 
 file(WRITE ${BuildDepends_BINARY_DIR}/Project/external.in "external changed\n")
+file(WRITE ${BuildDepends_BINARY_DIR}/Project/multi1-in.txt "multi1-in changed\n")
 
 help_xcode_depends()
 
@@ -319,3 +334,16 @@ else()
   message(SEND_ERROR "Project did not rebuild properly: "
     "external.out is missing")
 endif()
+
+if(EXISTS ${BuildDepends_BINARY_DIR}/Project/multi1-out2-copy.txt)
+  file(STRINGS ${BuildDepends_BINARY_DIR}/Project/multi1-out2-copy.txt multi1_out)
+  if("${multi1_out}" STREQUAL "multi1-in changed")
+    message(STATUS "multi1-out2-copy.txt contains '${multi1_out}'")
+  else()
+    message(SEND_ERROR "Project did not rebuild properly: "
+      "multi1-out2-copy.txt contains '${multi1_out}'")
+  endif()
+else()
+  message(SEND_ERROR "Project did not rebuild properly: "
+    "multi1-out2-copy.txt is missing")
+endif()
diff --git a/Tests/BuildDepends/Project/CMakeLists.txt b/Tests/BuildDepends/Project/CMakeLists.txt
index 9ee4a43..cb9fbf8 100644
--- a/Tests/BuildDepends/Project/CMakeLists.txt
+++ b/Tests/BuildDepends/Project/CMakeLists.txt
@@ -151,3 +151,16 @@ ExternalProject_Add(ExternalBuild
     -Dexternal_out=${CMAKE_CURRENT_BINARY_DIR}/external.out
   INSTALL_COMMAND ""
   )
+
+add_custom_command(
+  OUTPUT multi1-out1.txt multi1-out2.txt
+  COMMAND ${CMAKE_COMMAND} -E copy multi1-in.txt multi1-out1.txt
+  COMMAND ${CMAKE_COMMAND} -E copy multi1-in.txt multi1-out2.txt
+  DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/multi1-in.txt
+  )
+add_custom_command(
+  OUTPUT multi1-out2-copy.txt
+  COMMAND ${CMAKE_COMMAND} -E copy multi1-out2.txt multi1-out2-copy.txt
+  DEPENDS multi1-out2.txt
+  )
+add_custom_target(multi1 ALL DEPENDS multi1-out2-copy.txt)