Fixes for C-level build of libdispatch on Linux

Still needed pieces of PR#257 related to C-level build/test.
  1. rule to generate provider.h from provider.d using dtrace
  2. default to building shared libraries (needed for Swift)
  3. increase test timeout to 600 seconds (for noisy Swift CI)

Author: dgrove-oss

CMakeLists.txt

@@ -29,6 +29,8 @@ include(DispatchAppleOptions)
 option(ENABLE_DISPATCH_INIT_CONSTRUCTOR "enable libdispatch_init as a constructor" ON)
 set(USE_LIBDISPATCH_INIT_CONSTRUCTOR ${ENABLE_DISPATCH_INIT_CONSTRUCTOR})
 
+option(BUILD_SHARED_LIBS "build shared libraries" ON)
+
 # TODO(compnerd) swift options
 
 if(CMAKE_SYSTEM_NAME STREQUAL Linux OR

src/CMakeLists.txt

@@ -1,7 +1,18 @@
 
 include(SwiftSupport)
 
+set(dispatch_DTRACE_HEADERS)
+if(dtrace_EXECUTABLE)
+  list(APPEND dispatch_DTRACE_HEADERS ${CMAKE_CURRENT_BINARY_DIR}/provider.h)
+  add_custom_command(
+    OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/provider.h
+    COMMAND ${dtrace_EXECUTABLE} -h -s ${CMAKE_CURRENT_SOURCE_DIR}/provider.d -o ${header} ${CMAKE_CURRENT_BINARY_DIR}/provider.h
+    DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/provider.d
+  )
+endif()
+
 add_library(dispatch
+              ${dispatch_DTRACE_HEADERS}
               allocator.c
               apply.c
               benchmark.c
@@ -106,6 +117,7 @@ endif()
 target_include_directories(dispatch
                            PRIVATE
                              ${CMAKE_BINARY_DIR}
+                             ${CMAKE_CURRENT_BINARY_DIR}
                              ${CMAKE_SOURCE_DIR}
                              ${CMAKE_CURRENT_SOURCE_DIR}
                              ${CMAKE_SOURCE_DIR}/private)

tests/CMakeLists.txt

@@ -90,7 +90,7 @@ function(add_unit_test name)
            COMMAND bsdtestharness $<TARGET_FILE:${name}>)
   set_tests_properties(${name}
                        PROPERTIES
-                         TIMEOUT 30
+                         TIMEOUT 600
                          DEPENDS bsdtestharness
                          WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
   if(NOT leaks_EXECUTABLE)