From c64797fa94de29ef3f5f9c940273036c9ebf64ee Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Tue, 9 Oct 2018 08:25:16 -0400
Subject: FindBISON: Fix "multiple rules generate" error on VERBOSE output

When `BISON_TARGET` is called with both

    VERBOSE <extra-file> REPORT_FILE <file>

we add a custom command to copy `<file>` to `<extra-file>`.  The change
in commit v3.7.1~10^2 (FindBISON: Do not rebuild every time when not
VERBOSE, 2016-11-14) incorrectly listed the extra file as an output of
the main bison invocation custom command, but it is actually produced by
the separate copy command.  Fix the logic to always generate `<file>` as
an output of the bison command and `<extra-file>` as an output of the
copy command.

Fixes: #18433
---
 Modules/FindBISON.cmake | 21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/Modules/FindBISON.cmake b/Modules/FindBISON.cmake
index d684ccd..2000f7f 100644
--- a/Modules/FindBISON.cmake
+++ b/Modules/FindBISON.cmake
@@ -149,17 +149,25 @@ if(BISON_EXECUTABLE)
       set(BISON_TARGET_verbose_file "${ReportFile}")
       list(APPEND BISON_TARGET_cmdopt "--report-file=${BISON_TARGET_verbose_file}")
     endif()
+    if(NOT IS_ABSOLUTE "${BISON_TARGET_verbose_file}")
+      set(BISON_TARGET_verbose_file "${CMAKE_CURRENT_SOURCE_DIR}/${BISON_TARGET_verbose_file}")
+    endif()
   endmacro()
 
   # internal macro
   # adds a custom command and sets
-  #   BISON_TARGET_cmdopt, BISON_TARGET_verbose_file, BISON_TARGET_extraoutputs
+  #   BISON_TARGET_cmdopt, BISON_TARGET_extraoutputs
   macro(BISON_TARGET_option_verbose Name BisonOutput filename)
     list(APPEND BISON_TARGET_cmdopt "--verbose")
-    list(APPEND BISON_TARGET_extraoutputs
+    list(APPEND BISON_TARGET_outputs
       "${BISON_TARGET_verbose_file}")
     if (NOT "${filename}" STREQUAL "")
-      add_custom_command(OUTPUT ${filename}
+      if(IS_ABSOLUTE "${filename}")
+        set(BISON_TARGET_verbose_extra_file "${filename}")
+      else()
+        set(BISON_TARGET_verbose_extra_file "${CMAKE_CURRENT_SOURCE_DIR}/${filename}")
+      endif()
+      add_custom_command(OUTPUT ${BISON_TARGET_verbose_extra_file}
         COMMAND ${CMAKE_COMMAND} -E copy
         "${BISON_TARGET_verbose_file}"
         "${filename}"
@@ -167,10 +175,10 @@ if(BISON_EXECUTABLE)
         DEPENDS
         "${BISON_TARGET_verbose_file}"
         COMMENT "[BISON][${Name}] Copying bison verbose table to ${filename}"
-        WORKING_DIRECTORY ${CMAKE_SOURCE_DIR})
-      set(BISON_${Name}_VERBOSE_FILE ${filename})
+        WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})
       list(APPEND BISON_TARGET_extraoutputs
-        "${filename}")
+        "${BISON_TARGET_verbose_extra_file}")
+      unset(BISON_TARGET_verbose_extra_file)
     endif()
   endmacro()
 
@@ -226,7 +234,6 @@ if(BISON_EXECUTABLE)
       list(APPEND BISON_TARGET_outputs "${BISON_TARGET_output_header}")
 
       add_custom_command(OUTPUT ${BISON_TARGET_outputs}
-        ${BISON_TARGET_extraoutputs}
         COMMAND ${BISON_EXECUTABLE} ${BISON_TARGET_cmdopt} -o ${BisonOutput} ${BisonInput}
         VERBATIM
         DEPENDS ${BisonInput}
-- 
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