Use a custom target for arith.h

because including a file generated by a custom command in more
than one target may result in it being generated multiple times
in a parallel build which doesn't work reliably in msbuild (#62).
See also http://www.cmake.org/pipermail/cmake/2008-October/024492.html

src/asl/CMakeLists.txt

@@ -85,8 +85,13 @@ else ()
   endif ()
 endif ()
 
-set(ASL_CORE_SOURCES
-  ${CMAKE_CURRENT_BINARY_DIR}/details.c ${CMAKE_CURRENT_BINARY_DIR}/arith.h)
+# Use a custom target for arith.h, because including a file generated by a custom
+# command in more than one target may result in it being generated multiple times
+# in a parallel build which doesn't work reliably in msbuild (#62).
+# See also http://www.cmake.org/pipermail/cmake/2008-October/024492.html
+add_custom_target(arith.h DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/arith.h)
+
+set(ASL_CORE_SOURCES ${CMAKE_CURRENT_BINARY_DIR}/details.c)
 add_prefix(ASL_CORE_SOURCES solvers/
   errchk.h
   jac2dim.h
@@ -205,11 +210,11 @@ endif ()
 add_mp_library(asl-core OBJECT ${ASL_CORE_SOURCES}
   COMPILE_DEFINITIONS ${ASL_COMPILE_DEFINITIONS}
   INCLUDE_DIRECTORIES ${CMAKE_CURRENT_BINARY_DIR})
+add_dependencies(asl-core arith.h)
 
 # Public ASL headers.
 set(ASL_HEADERS aslbuilder.h aslsolver.h aslexpr.h aslexpr-visitor.h
-  aslproblem.h aslinterface.h ${CMAKE_CURRENT_BINARY_DIR}/arith.h
-  ${CMAKE_CURRENT_BINARY_DIR}/stdio1.h)
+  aslproblem.h aslinterface.h ${CMAKE_CURRENT_BINARY_DIR}/stdio1.h)
 add_prefix(ASL_HEADERS solvers/
   asl.h asl_pfg.h asl_pfgh.h avltree.h funcadd.h getstub.h jacpdim.h nlp.h
   nlp2.h psinfo.h)
@@ -219,6 +224,7 @@ set(ASL_SOURCES
 set(ASL_INCLUDE_DIRS solvers ${CMAKE_CURRENT_BINARY_DIR})
 add_mp_library(asl-extra OBJECT ${ASL_SOURCES} ${ASL_HEADERS}
   INCLUDE_DIRECTORIES ${ASL_INCLUDE_DIRS} ${PROJECT_SOURCE_DIR}/src)
+add_dependencies(asl-extra arith.h)
 
 add_mp_library(asl STATIC OBJECT_LIBRARIES asl-core asl-extra
   LIBRARIES mp INCLUDE_DIRECTORIES ${ASL_INCLUDE_DIRS})
@@ -349,6 +355,7 @@ else ()
   add_c_compiler_flags(asl-core -Wno-unused-result -Wno-parentheses)
 endif ()
 
-install(FILES ${ASL_HEADERS} solvers/opcode.hd solvers/r_opn.hd
-  DESTINATION include/asl)
+install(FILES ${ASL_HEADERS} ${CMAKE_CURRENT_BINARY_DIR}/arith.h
+              solvers/opcode.hd solvers/r_opn.hd
+        DESTINATION include/asl)
 install(TARGETS asl tableproxy DESTINATION lib RUNTIME DESTINATION bin)