Large Refactor of CMake build system

This commit improves numerous functionalities of the OpenMP CMake build 
system to be more conducive with LLVM's build system and build philosophies.
The CMake build system, as it was before this commit, was not up to LLVM's 
standards and did not implement the configuration stage like most CMake based
build systems offer (check for compiler flags, libraries, etc.) In order to
improve it dramatically in a short period of time, a large refactoring had 
to be done.
The main changes done with this commit are as follows:

* Compiler flag checks - The flags are no longer grabbed from compiler specific
  directories.  They are checked for availability in config-ix.cmake and added
  accordingly inside LibompHandleFlags.cmake.
* Feature checks were added in config-ix.cmake.  For example, the standard CMake
  module FindThreads is probed for the threading model to use inside the OpenMP
  library.
* OS detection - There is no longer a LIBOMP_OS variable, OS-specifc build logic
  is wrapped around the WIN32 and APPLE macros with !(WIN32 OR APPLE) meaning 
  a Unix flavor of some sort.
* Got rid of vestigial functions/macros/variables
* Added new libomp_append() function which is used everywhere to conditionally
  or undconditionally append to a list
* All targets have the libomp prefix so as not to interfere with any other
  project
* LibompCheckLinkerFlag.cmake module was added which checks for linker flags
  specifically for building shared libraries.
* LibompCheckFortranFlag.cmake module was added which checks for fortran flag
  availability.
* Removed most of the cruft from the translation between the perl+Makefile based
  build system and this one.  The remaining components that they share are
  perl scripts which I'm in the process of removing.

There is still more left to do.  The perl scripts still need to be removed, and
a config.h.in file (or similarly named) needs to be added with #cmakedefine lines
in it.  But this is a much better first step than the previous system.

Differential Revision: http://reviews.llvm.org/D10656

llvm-svn: 242298

1 files changed, 0 insertions, 260 deletions

diff --git a/openmp/runtime/cmake/HelperFunctions.cmake b/openmp/runtime/cmake/HelperFunctions.cmake
deleted file mode 100644
index b2292236b5e..00000000000
--- a/openmp/runtime/cmake/HelperFunctions.cmake
+++ /dev/null
@@ -1,260 +0,0 @@
-#
-#//===----------------------------------------------------------------------===//
-#//
-#//                     The LLVM Compiler Infrastructure
-#//
-#// This file is dual licensed under the MIT and the University of Illinois Open
-#// Source Licenses. See LICENSE.txt for details.
-#//
-#//===----------------------------------------------------------------------===//
-#
-
-####################################### FUNCTIONS/MACROS ###########################################
-# It should be noted that in cmake, functions can only be used on a single line with the return value
-# stored in a parameter you send to the function.  There isn't a true return value.  So technically, 
-# all functions would have a C/C++ prototype of:
-# void function_name(parameter1, parameter2, ...);
-#  
-# If you want a return value, you have to use a parameter so the function prototype would be:
-# void function_name(input_parameter1, input_parameter2, ...,  return_value)
-# ##################
-
-# void say(string message_to_user);
-# - prints out message_to_user
-macro(say message_to_user)
-    message(STATUS "${message_to_user}")
-endmacro()
-
-# void warning_say(string message_to_user);
-# - prints out message_to_user with a warning
-macro(warning_say message_to_user)
-    message(WARNING "${message_to_user}")
-endmacro()
-
-# void error_say(string message_to_user);
-# - prints out message_to_user with an error and exits cmake
-macro(error_say message_to_user)
-    message(FATAL_ERROR "${message_to_user}")
-endmacro()
-
-# void debug_say(string message_to_developer);
-# - prints out message when GLOBAL_DEBUG == 1 (for debugging cmake build)
-macro(debug_say message_to_developer)
-    if(${GLOBAL_DEBUG} STREQUAL "1")
-        say("DEBUG: ${message_to_developer}")
-    endif()
-endmacro()
-
-# void debug_say_var(variable var);
-# - prints the variable name and its value (for debugging cmake build)
-macro(debug_say_var var)
-    if(${GLOBAL_DEBUG} STREQUAL "1")
-        say("DEBUG: Variable: ${var} = ${${var}} ")
-    endif()
-endmacro()
-
-# void set_legal_arch(string* return_arch_string);
-# - returns (through return_arch_string) the formal architecture 
-#   string or warns user of unknown architecture
-function(set_legal_arch return_arch_string)
-    if(${IA32}) 
-        set(${return_arch_string} "IA-32" PARENT_SCOPE)
-    elseif(${INTEL64})
-        set(${return_arch_string} "Intel(R) 64" PARENT_SCOPE)
-    elseif(${MIC})
-        set(${return_arch_string} "Intel(R) Many Integrated Core Architecture" PARENT_SCOPE)
-    elseif(${LIBOMP_ARCH} STREQUAL "l1")
-        set(${return_arch_string} "L1OM" PARENT_SCOPE)
-    elseif(${ARM})
-        set(${return_arch_string} "ARM" PARENT_SCOPE)
-	elseif(${PPC64BE})
-	    set(${return_arch_string} "PPC64BE" PARENT_SCOPE)
-	elseif(${PPC64LE})
-	    set(${return_arch_string} "PPC64LE" PARENT_SCOPE)
-    elseif(${AARCH64})                                                                                   
-        set(${return_arch_string} "AARCH64" PARENT_SCOPE)
-    else()
-        warning_say("set_legal_arch(): Warning: Unknown architecture...")
-    endif()
-endfunction()
-
-# void check_variable(string var, string var_name, list<string>values_list);
-# - runs through values_list checking if ${var} == values_list[i] for any i.
-# - if the var is found, then just print it out
-# - if the var is not found, then warn user
-function(check_variable var values_list)
-    set(valid_flag 0)
-    foreach(value IN LISTS values_list)
-        if("${${var}}" STREQUAL "${value}")
-            set(valid_flag 1)
-            set(the_value "${value}")
-        endif()
-    endforeach()
-    if(${valid_flag} EQUAL 0)
-        error_say("check_variable(): ${var} = ${${var}} is unknown")
-    endif()
-endfunction()
-
-# void _export_lib_dir(string export_dir, string platform, string suffix, string* return_value);
-# - basically a special case for mac platforms where it adds '.thin' to the output lib directory
-function(_export_lib_dir pltfrm return_value)
-    if(${MAC})
-        set(${return_value} "${export_dir}/${pltfrm}${suffix}/lib.thin" PARENT_SCOPE)
-    else()
-        set(${return_value} "${export_dir}/${pltfrm}${suffix}/lib" PARENT_SCOPE)
-    endif()
-endfunction()
-
-# void _export_lib_fat_dir(string export_dir, string platform, string suffix, string* return_value);
-# - another mac specialty case for fat libraries.
-# - this sets export_lib_fat_dir in the MAIN part of CMakeLists.txt
-function(_export_lib_fat_dir pltfrm return_value)
-    set(${return_value} "${export_dir}/${pltfrm}${suffix}/lib" PARENT_SCOPE)
-endfunction()
-
-# void get_build_number(string src_dir, string* return_build_number);
-# - grab the eight digit build number (or 00000000) from kmp_version.c
-function(get_build_number src_dir return_build_number)
-    # sets file_lines_list to a list of all lines in kmp_version.c
-    file(STRINGS "${src_dir}/src/kmp_version.c" file_lines_list)
-
-    # runs through each line in kmp_version.c
-    foreach(line IN LISTS file_lines_list)
-        # if the line begins with "#define KMP_VERSION_BUILD" then we take not of the build number
-        string(REGEX MATCH "^[ \t]*#define[ \t]+KMP_VERSION_BUILD" valid "${line}")
-        if(NOT "${valid}" STREQUAL "") # if we matched "#define KMP_VERSION_BUILD", then grab the build number
-            string(REGEX REPLACE "^[ \t]*#define[ \t]+KMP_VERSION_BUILD[ \t]+([0-9]+)" "\\1"
-                   build_number "${line}"
-            )
-        endif()
-    endforeach()
-    set(${return_build_number} "${build_number}" PARENT_SCOPE) # return build number
-endfunction()
-
-# void set_legal_type(string* return_legal_type);
-# - set the legal type name Performance/Profiling/Stub
-function(set_legal_type return_legal_type)
-    if(${NORMAL_LIBRARY})
-        set(${return_legal_type} "Performance" PARENT_SCOPE)
-    elseif(${PROFILE_LIBRARY})
-        set(${return_legal_type} "Profiling" PARENT_SCOPE)
-    elseif(${STUBS_LIBRARY})
-        set(${return_legal_type} "Stub" PARENT_SCOPE)
-    endif()
-endfunction()
-
-# void set_mac_os_new(bool* return_mac_os_new);
-# - sets the return_mac_os_new variable to true or false based on macosx version
-# - no real "cmakey" way to do this.  Have to call execute_process()
-function(set_mac_os_new return_mac_os_new)
-    execute_process(COMMAND "sw_vers" "-productVersion" OUTPUT_VARIABLE mac_osx_version)
-    if("${mac_osx_version}" VERSION_GREATER "10.6")
-        set(${return_mac_os_new} TRUE PARENT_SCOPE)
-    else()
-        set(${return_mac_os_new} FALSE PARENT_SCOPE)
-    endif()
-endfunction()
-
-# void add_prefix(string prefix, list<string>* list_of_items);
-# - returns list_of_items with prefix prepended to all items
-# - original list is modified
-function(add_prefix prefix list_of_items)
-    set(local_list "")
-    foreach(item IN LISTS "${list_of_items}")
-        if(NOT "${item}" STREQUAL "")
-            list(APPEND local_list "${prefix}${item}")
-        endif()
-    endforeach()
-    set(${list_of_items} "${local_list}" PARENT_SCOPE)
-endfunction()
-
-# void add_suffix(string suffix, list<string>* list_of_items);
-# - returns list_of_items with suffix appended to all items
-# - original list is modified
-function(add_suffix suffix list_of_items)
-    set(local_list "")
-    foreach(item IN LISTS "${list_of_items}")
-        if(NOT "${item}" STREQUAL "")
-            list(APPEND local_list "${item}${suffix}")
-        endif()
-    endforeach()
-    set(${list_of_items} "${local_list}" PARENT_SCOPE)
-endfunction()
-
-# void strip_suffix(list<string> list_of_items, list<string>* return_list);
-# - returns a new list with suffix stripped (i.e., foo.c => foo)
-# - list_of_items is not modified, return_list is modified
-function(strip_suffix list_of_items return_list)
-    set(local_list "")
-    foreach(item IN LISTS "${list_of_items}")
-        if(NOT "${item}" STREQUAL "")
-            get_filename_component(filename "${item}" NAME_WE)
-            list(APPEND local_list "${filename}")
-        endif()
-    endforeach()
-    set(${return_list} "${local_list}" PARENT_SCOPE)
-endfunction()
-
-# void list_to_string(list<string> list_of_things, string* return_string);
-# - converts a list to a space separated string
-function(list_to_string list_of_things return_string)
-    string(REPLACE ";" " " output_variable "${list_of_things}")
-    set(${return_string} "${output_variable}" PARENT_SCOPE)
-endfunction()
-
-# void string_to_list(string str, list<string>* return_list);
-# - converts a string to a semicolon separated list
-# - what it really does is just string_replace all running whitespace to a semicolon
-# - in cmake, a list is strings separated by semicolons: i.e., list of four items, list = "item1;item2;item3;item4"
-function(string_to_list str return_list)
-    set(outstr)
-    string(REGEX REPLACE "[ \t]+" ";" outstr "${str}")
-    set(${return_list} "${outstr}" PARENT_SCOPE) 
-endfunction()
-
-# void get_date(string* return_date);
-# - returns the current date "yyyy-mm-dd hh:mm:ss UTC"
-# - this function alone causes the need for CMake v2.8.11 (TIMESTAMP)
-#function(get_date return_date)
-#    string(TIMESTAMP local_date "%Y-%m-%d %H:%M:%S UTC" UTC)
-#    set(${return_date} ${local_date} PARENT_SCOPE)
-#endfunction()
-
-# void find_a_program(string program_name, list<string> extra_paths, bool fail_on_not_found, string return_variable_name);
-# - returns the full path of a program_name
-# - first looks in the list of extra_paths
-# - if not found in extra_paths, then look through system path
-# - errors out if fail_on_not_found == true and cmake could not find program_name.
-function(find_a_program program_name extra_paths fail_on_not_found return_variable_name)
-    # first try to find the program in the extra_paths
-    find_program(${return_variable_name} "${program_name}" PATHS "${extra_paths}" DOC "Path to ${program_name}" NO_CMAKE_ENVIRONMENT_PATH NO_CMAKE_PATH NO_SYSTEM_ENVIRONMENT_PATH NO_CMAKE_SYSTEM_PATH)
-    if("${${return_variable_name}}" MATCHES NOTFOUND)
-        # if no extra_paths, or couldn't find it, then look in system $PATH
-        find_program(${return_variable_name} "${program_name}" DOC "Path to ${program_name}")
-        if("${${return_variable_name}}" MATCHES NOTFOUND AND ${fail_on_not_found})
-            error_say("Error: Could not find program: ${program_name}")
-        endif()
-    endif()
-
-    if(NOT "${${return_variable_name}}" MATCHES NOTFOUND)
-        say("-- Found ${program_name}: ${${return_variable_name}}")
-    endif()
-
-    set(${return_variable_name} ${${return_variable_name}} PARENT_SCOPE)
-endfunction()
-
-# WINDOWS SPECIFIC 
-# void replace_md_with_mt(string flags_var)
-# - This macro replaces the /MD compiler flags (Windows specific) with /MT compiler flags
-# - This does nothing if no /MD flags were replaced.
-macro(replace_md_with_mt flags_var)
-    set(flags_var_name  ${flags_var}) # i.e., CMAKE_C_FLAGS_RELEASE
-    set(flags_var_value ${${flags_var}}) # i.e., "/MD /O2 ..."
-    string(REPLACE /MD /MT temp_out "${flags_var_value}")
-    string(COMPARE NOTEQUAL "${temp_out}" "${flags_var_value}" something_was_replaced)
-    if("${something_was_replaced}")
-        unset(${flags_var_name} CACHE)
-        set(${flags_var_name} ${temp_out} CACHE STRING "Replaced /MD with /MT compiler flags")
-    endif()
-endmacro()
-