commit a57db559e93d437fc9e6684db8136e5170ebd922
Author: Danny Robson <danny@nerdcruft.net>
Date:   Tue Jan 17 19:20:12 2017 +1100

    initial import

diff --git a/FindRAGEL.cmake b/FindRAGEL.cmake
new file mode 100644
index 0000000..d778791
--- /dev/null
+++ b/FindRAGEL.cmake
@@ -0,0 +1,112 @@
+# - Find Ragel executable and provides macros to generate custom build rules
+# The module defines the following variables:
+#
+#  RAGEL_EXECUTABLE - path to the bison program
+#  RAGEL_VERSION - version of bison
+#  RAGEL_FOUND - true if the program was found
+#
+# If ragel is found, the module defines the macros:
+#
+#  RAGEL_TARGET(<Name> <RagelInp> <CodeOutput>
+#              [COMPILE_FLAGS <string>])
+#
+# which will create  a custom rule to generate a state machine. <RagelInp> is
+# the path to a Ragel file. <CodeOutput> is the name of the source file
+# generated by ragel. If  COMPILE_FLAGS option is specified, the next
+# parameter is  added in the bison  command line.
+#
+# The macro defines a set of variables:
+#  RAGEL_${Name}_DEFINED       - true is the macro ran successfully
+#  RAGEL_${Name}_INPUT         - The input source file, an alias for <RagelInp>
+#  RAGEL_${Name}_OUTPUT_SOURCE - The source file generated by ragel
+#  RAGEL_${Name}_OUTPUT_HEADER - The header file generated by ragel
+#  RAGEL_${Name}_OUTPUTS       - The sources files generated by ragel
+#  RAGEL_${Name}_COMPILE_FLAGS - Options used in the ragel command line
+#
+#  ====================================================================
+#  Example:
+#
+#   find_package(RAGEL) # or e.g.: find_package(RAGEL 6.6 REQUIRED)
+#   RAGEL_TARGET(MyMachine machine.rl ${CMAKE_CURRENT_BINARY_DIR}/machine.cc)
+#   add_executable(Foo main.cc ${RAGEL_MyMachine_OUTPUTS})
+#  ====================================================================
+
+# 2014-02-09, Georg Sauthoff <mail@georg.so>
+#
+# I don't think that these few lines are even copyrightable material,
+# but I am fine with using the BSD/MIT/GPL license on it ...
+#
+# I've used following references:
+# http://www.cmake.org/cmake/help/v2.8.12/cmake.html
+# /usr/share/cmake/Modules/FindFLEX.cmake
+# /usr/share/cmake/Modules/FindBISON.cmake
+
+# uses some features which are not available in 2.6
+cmake_minimum_required(VERSION 2.8)
+
+find_program(RAGEL_EXECUTABLE NAMES ragel DOC "path to the ragel executable")
+mark_as_advanced(RAGEL_EXECUTABLE)
+
+if(RAGEL_EXECUTABLE)
+
+  execute_process(COMMAND ${RAGEL_EXECUTABLE} --version
+    OUTPUT_VARIABLE RAGEL_version_output
+    ERROR_VARIABLE  RAGEL_version_error
+    RESULT_VARIABLE RAGEL_version_result
+    OUTPUT_STRIP_TRAILING_WHITESPACE)
+
+  if(${RAGEL_version_result} EQUAL 0)
+    string(REGEX REPLACE "^Ragel State Machine Compiler version ([^ ]+) .*$"
+                         "\\1"
+                         RAGEL_VERSION "${RAGEL_version_output}")
+  else()
+    message(SEND_ERROR
+            "Command \"${RAGEL_EXECUTABLE} --version\" failed with output:
+${RAGEL_version_error}")
+  endif()
+
+  #============================================================
+  # RAGEL_TARGET (public macro)
+  #============================================================
+  #
+  macro(RAGEL_TARGET Name Input Output)
+    set(RAGEL_TARGET_usage
+              "RAGEL_TARGET(<Name> <Input> <Output> [COMPILE_FLAGS <string>]")
+    if(${ARGC} GREATER 3)
+      if(${ARGC} EQUAL 5)
+        if("${ARGV3}" STREQUAL "COMPILE_FLAGS")
+          set(RAGEL_EXECUTABLE_opts  "${ARGV4}")
+          separate_arguments(RAGEL_EXECUTABLE_opts)
+        else()
+          message(SEND_ERROR ${RAGEL_TARGET_usage})
+        endif()
+      else()
+        message(SEND_ERROR ${RAGEL_TARGET_usage})
+      endif()
+    endif()
+
+    get_filename_component(Dir "${Output}" DIRECTORY)
+    file(MAKE_DIRECTORY ${Dir})
+
+    add_custom_command(OUTPUT ${Output}
+      COMMAND ${RAGEL_EXECUTABLE}
+      ARGS    ${RAGEL_EXECUTABLE_opts} -o${Output} ${Input}
+      DEPENDS ${Input}
+      COMMENT
+          "[RAGEL][${Name}] Compiling state machine with Ragel ${RAGEL_VERSION}"
+      WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})
+
+    set(RAGEL_${Name}_DEFINED       TRUE)
+    set(RAGEL_${Name}_OUTPUTS       ${Output})
+    set(RAGEL_${Name}_INPUT         ${Input})
+    set(RAGEL_${Name}_COMPILE_FLAGS ${RAGEL_EXECUTABLE_opts})
+  endmacro()
+
+endif()
+
+# use this include when module file is located under /usr/share/cmake/Modules
+#include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
+# use this include when module file is located in build tree
+include(FindPackageHandleStandardArgs)
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(RAGEL REQUIRED_VARS  RAGEL_EXECUTABLE
+                                        VERSION_VAR    RAGEL_VERSION)
diff --git a/canonical_host.cmake b/canonical_host.cmake
new file mode 100644
index 0000000..2b6441b
--- /dev/null
+++ b/canonical_host.cmake
@@ -0,0 +1,21 @@
+macro (canonical_host)
+    if (NOT __test_canonical_host)
+        message (STATUS "checking the host CPU")
+
+        execute_process (
+            COMMAND ${CMAKE_CXX_COMPILER} -dumpmachine
+            RESULT_VARIABLE __canonical_host_result
+            OUTPUT_VARIABLE __canonical_host_output
+        )
+
+        if (${__canonical_host_result})
+            message (FATAL_ERROR "unable to query for canonical host")
+        endif (${__canonical_host_result})
+        
+        string(REGEX MATCH "^([^-\]+)" HOST_CPU ${__canonical_host_output})
+
+        message (STATUS "checking the host CPU - found '${HOST_CPU}'")
+    endif (NOT __test_canonical_host)
+
+    set (__test_canonical_host 1 INTERNAL)
+endmacro (canonical_host)
diff --git a/compile_flag.cmake b/compile_flag.cmake
new file mode 100644
index 0000000..455863b
--- /dev/null
+++ b/compile_flag.cmake
@@ -0,0 +1,11 @@
+macro (append_compile_flag _flag)
+    string (MAKE_C_IDENTIFIER ${_flag} _name)
+
+    if (NOT __append_compile_flag_${_name})
+        check_cxx_compiler_flag (${_flag} __append_compile_flag_${_name})
+        if (__append_compile_flag_${_name})
+            set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${_flag}")
+            set (__append_compile_flag_${_name} 1 INTERNAL)
+        endif ()
+    endif ()
+endmacro(append_compile_flag)
diff --git a/link_flag.cmake b/link_flag.cmake
new file mode 100644
index 0000000..b9ecc24
--- /dev/null
+++ b/link_flag.cmake
@@ -0,0 +1,25 @@
+macro(check_link_flag variable flag)
+    message (STATUS "checking linker flag ${flag}")
+
+    set (__check_linker_flag_old "${CMAKE_EXE_LINKER_FLAGS}" INTERNAL)
+    set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${flag}")
+
+    try_compile (test_check_linker_flag
+        "${CMAKE_BINARY_DIR}/CMakeTmp"
+        SOURCES "${CMAKE_SOURCE_DIR}/cmake/test_link_flag.cpp")
+    if (test_check_linker_flag)
+        message (STATUS "checking linker flag ${flag} - found")
+        set (${variable} 1)
+    else(test_check_linker_flag)
+        message (STATUS "checking linker flag ${flag} - not found")
+        set (${variable} 0)
+    endif(test_check_linker_flag)
+endmacro()
+
+
+macro(append_link_flag flag)
+    check_link_flag (__test_link_flag_${flag} ${flag})
+    if (__test_link_flag_${flag})
+        set (CMAKE_EXE_LINKER_FLAGS "${__append_link_flag_old}")
+    endif()
+endmacro()
diff --git a/nc_cxx.cmake b/nc_cxx.cmake
new file mode 100644
index 0000000..395ad77
--- /dev/null
+++ b/nc_cxx.cmake
@@ -0,0 +1,25 @@
+include (compile_flag)
+include (test_restrict)
+
+
+###############################################################################
+append_compile_flag (-std=c++1z)
+
+
+###############################################################################
+# find the gcc experimental filesystem library and append to libs if needed
+find_library(STDCXXFS NAMES stdc++fs)
+if (STDCXXFS)
+    set(LIBS ${LIBS} ${STDCXXFS})
+endif (STDCXXFS)
+
+
+###############################################################################
+test_restrict(RESTRICT_KEYWORD)
+add_definitions("-Drestrict=${RESTRICT_KEYWORD}")
+
+
+###############################################################################
+append_compile_flag("-pipe")
+append_compile_flag("-fno-deduce-init-list")
+append_compile_flag("-fvisibility=hidden")
diff --git a/nc_optimisation.cmake b/nc_optimisation.cmake
new file mode 100644
index 0000000..53efe4a
--- /dev/null
+++ b/nc_optimisation.cmake
@@ -0,0 +1,121 @@
+include (compile_flag)
+include (link_flag)
+include (canonical_host)
+
+
+###############################################################################
+option(ENABLE_LTO "enable link-time optimisation" OFF)
+
+
+##-----------------------------------------------------------------------------
+if (ENABLE_LTO)
+    append_compile_flag("-flto")
+    append_compile_flag("-fno-fat-lto-objects")
+    append_link_flag("-fuse-linker-plugin")
+    append_compile_flags("-fdevirtualize-at-ltrans")
+endif (ENABLE_LTO)
+
+
+###############################################################################
+option(ENABLE_FRAMEPOINTER "retain the framepointer even if optimising" OFF)
+
+
+##-----------------------------------------------------------------------------
+if (ENABLE_FRAMEPOINTER)
+    append_compile_flags("-fno-omit-frame-pointer")
+endif (ENABLE_FRAMEPOINTER)
+
+
+###############################################################################
+canonical_host()
+
+
+##-----------------------------------------------------------------------------
+if (${HOST_CPU} STREQUAL "x86_64")
+    append_compile_flag(-mtune=generic)
+    append_compile_flag(-msse)
+    append_compile_flag(-msse2)
+    append_compile_flag(-msahf)
+elseif (${HOST_CPU} STREQUAL "i686")
+    append_compile_flag(-march=prescott)
+    append_compile_flag(-mtune=generic)
+    append_compile_flag(-mcmov)
+    append_compile_flag(-mfpmath=sse)
+else ()
+    message (FATAL_ERROR "unknown HOST_CPU '${HOST_CPU}'")
+endif ()
+
+
+###############################################################################
+if (CMAKE_BUILD_TYPE MATCHES DEBUG)
+else()
+    append_compile_flag(-ftree-vectorize)
+
+    # clang vectorisation
+    append_compile_flag(-fvectorize)
+    append_compile_flag(-fslp-vectorize)
+    append_compile_flag(-fslp-vectorize-aggressive)
+
+    # loop hosting/distribution
+    append_compile_flag(-floop-nest-optimize)
+
+    append_compile_flag(-ftree-loop-distribution)
+    append_compile_flag(-ftree-loop-distribute-patterns)
+    append_compile_flag(-ftree-loop-im)
+    append_compile_flag(-ftree-loop-if-convert-stores)
+
+    append_compile_flag(-fivopts)
+
+    append_compile_flag(-funsafe-loop-optimizations)
+    append_compile_flag(-floop-interchange)
+
+    append_compile_flag(-fpredictive-commoning)
+    append_compile_flag(-funswitch-loops)
+
+    # options that require substantial time/memory
+    # GCC: ipa-pta can produce broken code when using LTO
+    #AS_IF([test "x$ax_cv_cxx_compiler_vendor" != "xgnu"   ||
+    #       test "x$enable_lto"                != "xyes"], [
+    #    AX_APPEND_COMPILE_FLAGS([-fipa-pta])
+    #])
+
+    # safety removal for performance
+    append_compile_flag(-fno-stack-protector)
+endif()
+
+
+###############################################################################
+if (CMAKE_BUILD_TYPE MATCHES DEBUG)
+else ()
+    append_compile_flag(-fdevirtualize)
+    append_compile_flag(-fdevirtualize-speculatively)
+
+    check_link_flag(TEST_GC_SECTIONS, "-Wl,--gc-sections")
+    if (TEST_LD_GC_SECTIONS)
+        append_compile_flag(-fdata-sections)
+        append_compile_flag(-ffunction-sections)
+        append_link_flag("-Wl,--gc-sections")
+    endif ()
+endif ()
+
+
+###############################################################################
+if (CMAKE_BUILD_TYPE MATCHES DEBUG)
+    add_definitions(-DENABLE_DEBUGGING)
+    add_definitions(-D_GLIBCXX_DEBUG)
+
+    append_compile_flag(-O0)
+    append_compile_flag(-Werror)
+    # this was protected for xmingw32, find out why
+    append_compile_flag(-fstack-protector)
+else ()
+    append_compile_flag(-O2)
+    append_compile_flag(-fno-rtti)
+    add_definitions(-DNO_RTTI)
+    add_definitions(-DNDEBUG)
+endif ()
+
+
+###############################################################################
+append_compile_flag(-g)
+append_compile_flag(-ggdb)
diff --git a/nc_platform.cmake b/nc_platform.cmake
new file mode 100644
index 0000000..c147295
--- /dev/null
+++ b/nc_platform.cmake
@@ -0,0 +1,31 @@
+include (compile_flag)
+include (link_flag)
+
+
+###############################################################################
+# attempt to detect platforms that aren't super common
+if (${CMAKE_SYSTEM_NAME} STREQUAL "Linux")
+    set(LINUX 1)
+elseif (${CMAKE_SYSTEM_NAME} STREQUAL "FreeBSD")
+    set(FREEBSD 1)
+else()
+    message (FATAL_ERROR "unknown platform")
+endif()
+
+
+###############################################################################
+# apply useful, non-obvious, default settings for each platform
+if (WINDOWS)
+    add_definitions("-DWIN32_LEAN_AND_MEAN")
+endif(WINDOWS)
+
+if (FREEBSD)
+    append_compile_flag("-I/usr/local/include")
+    append_link_flag("-L/usr/local/lib")
+endif (FREEBSD)
+
+
+###############################################################################
+# general platform assistance settings
+append_link_flag("-fno-common")
+append_link_flag("-fno-nonansi-builtins")
diff --git a/nc_warnings.cmake b/nc_warnings.cmake
new file mode 100644
index 0000000..82ab272
--- /dev/null
+++ b/nc_warnings.cmake
@@ -0,0 +1,87 @@
+include (compile_flag)
+
+append_compile_flag(-Wall)
+append_compile_flag(-Wextra)
+
+# -------------------------------------------------------------------------
+# General warnings
+append_compile_flag(-Wbool-compare)
+append_compile_flag(-Wcast-align)
+append_compile_flag(-Wcast-qual)
+append_compile_flag(-Wdisabled-optimization)
+append_compile_flag(-Wfloat-conversion)
+append_compile_flag(-Wfloat-equal)
+append_compile_flag(-Wno-aggressive-loop-optimizations)
+append_compile_flag(-Wnoexcept)
+append_compile_flag(-Wnon-virtual-dtor)
+append_compile_flag(-Wno-parentheses)
+append_compile_flag(-Wpointer-arith)
+append_compile_flag(-Wredundant-decls)
+append_compile_flag(-Wshadow)
+append_compile_flag(-Wsign-compare)
+append_compile_flag(-Wsign-promo)
+append_compile_flag(-Wstrict-aliasing)
+append_compile_flag(-Wstrict-overflow)
+append_compile_flag(-Wtype-limits)
+append_compile_flag(-Wunsafe-loop-optimizations)
+append_compile_flag(-Wunused-but-set-variable)
+append_compile_flag(-Wunused-parameter)
+append_compile_flag(-Wpessimizing-move)
+append_compile_flag(-Wswitch-enum)
+
+# gcc-6.1.0 warnings
+append_compile_flag(-Wshift-negative-value)
+append_compile_flag(-Wnull-dereference)
+append_compile_flag(-Wduplicated-cond)
+
+# useless-cast isn't usable on gcc-6.1 due to spurious warnings
+# see gcc#70844
+#AS_IF([test "x$ax_cv_cxx_compiler_vendor" != "xgnu" || test "x$ax_cv_cxx_compiler_version" != "x6.1.0"], [
+append_compile_flag(-Wuseless-cast)
+#])
+
+# clang 3.7.1 warnings
+append_compile_flag(-Wshorten-64-to-32)
+append_compile_flag(-Wdeprecated)
+append_compile_flag(-Wcovered-switch-default)
+
+# -------------------------------------------------------------------------
+# Required extensions
+#AX_APPEND_COMPILE_FLAGS([-Wgnu-flexible-array-union-member], [], [-Werror])
+#AX_APPEND_COMPILE_FLAGS([-Wno-c99-extensions], [], [-Werror])
+#AX_APPEND_COMPILE_FLAGS([-Wno-vla-extension], [], [-Werror])
+append_compile_flag(-Wno-vla)
+append_compile_flag(-Wno-multichar)
+
+#AS_IF([test "x$ax_cv_cxx_compiler_vendor" != "xgnu"], [
+#    AX_APPEND_COMPILE_FLAGS([-Wno-c99-extensions], [], [-Werror])
+#    AX_APPEND_COMPILE_FLAGS([-Wno-flexible-array-extensions], [], [-Werror])
+#    AX_APPEND_COMPILE_FLAGS([-Wno-gnu-conditional-omitted-operand], [], [-Werror])
+#    AX_APPEND_COMPILE_FLAGS([-Wno-gnu-empty-struct], [], [-Werror])
+#    AX_APPEND_COMPILE_FLAGS([-Wno-gnu-flexible-array-union-member], [], [-Werror])
+#    AX_APPEND_COMPILE_FLAGS([-Wno-gnu-zero-variadic-macro-arguments], [], [-Werror])
+#    AX_APPEND_COMPILE_FLAGS([-Wno-vla-extension], [], [-Werror])
+#    AX_APPEND_COMPILE_FLAGS([-Wno-zero-length-array], [], [-Werror])
+#])
+
+# -------------------------------------------------------------------------
+# Excessive warnings
+append_compile_flag(-Wno-missing-braces)
+
+#AS_IF([test "x$ax_cv_cxx_compiler_vendor" != "xgnu"], [
+#    AX_APPEND_COMPILE_FLAGS([-Wno-nested-anon-types], [], [-Werror])
+#    AX_APPEND_COMPILE_FLAGS([-Wno-unused-const-variable], [], [-Werror])
+#])
+
+# -------------------------------------------------------------------------
+option (ADVISORY "enable advisory warnings")
+
+if (ADVISORY)
+    append_compile_flag(-Winline)
+    append_compile_flag(-Wsuggest-final-types)
+    append_compile_flag(-Wsuggest-final-methods)
+    append_compile_flag(-Wsuggest-override)
+    append_compile_flag(-Wweak-vtables)
+    append_compile_flag(-Wpadded)
+endif()
+
diff --git a/search_libs.cmake b/search_libs.cmake
new file mode 100644
index 0000000..321f820
--- /dev/null
+++ b/search_libs.cmake
@@ -0,0 +1,39 @@
+# search a list of libraries for a given (C linkage) _symbol. returns the
+# required library in _variable, and defines HAVE_SYMBOL if it was found.
+macro(search_libs _variable _symbol)
+    message (STATUS "searching for ${_symbol}")
+
+    try_compile(
+        __search_libs_${_symbol}
+        "${CMAKE_BINARY_DIR}/CMakeTmp"
+        SOURCES "${CMAKE_SOURCE_DIR}/cmake/search_libs.cpp"
+        COMPILE_DEFINITIONS "-DSYMBOL=${_symbol}")
+
+    if (NOT __search_libs_${_symbol})
+        foreach (lib ${ARGN})
+            if (NOT __search_libs_${_symbol}_last)
+                message (STATUS "searching for ${_symbol} in ${lib}")
+                try_compile(
+                    __search_libs_${_symbol}
+                    "${CMAKE_BINARY_DIR}/CMakeTmp"
+                    SOURCES "${CMAKE_SOURCE_DIR}/cmake/search_libs.cpp"
+                    LINK_LIBRARIES "-l${lib}"
+                    COMPILE_DEFINITIONS "-DSYMBOL=${_symbol}")
+                set (__search_libs_${_symbol}_last ${lib})
+            endif ()
+        endforeach()
+    endif()
+
+    if (__search_libs_${_symbol})
+        if (__search_libs_${_symbol}_last)
+            message (STATUS "searching for ${_symbol} - found (in ${__search_libs_${_symbol}_last})")
+        else ()
+            message (STATUS "searching for ${_symbol} - found")
+        endif ()
+        set (${_variable} __search_libs_${_symbol}_last)
+        string (TOUPPER ${_symbol} upper_symbol)
+        set (HAVE_${upper_symbol} 1)
+    else ()
+        message (STATUS "searching for ${_symbol} - not found")
+    endif ()
+endmacro()
diff --git a/search_libs.cpp b/search_libs.cpp
new file mode 100644
index 0000000..d4b2b04
--- /dev/null
+++ b/search_libs.cpp
@@ -0,0 +1,13 @@
+extern "C" {
+    extern void SYMBOL (void);
+}
+
+
+int
+main (int argc, char **argv)
+{
+    (void)argc;
+    (void)argv;
+
+    SYMBOL ();
+}
diff --git a/test_link_flag.cpp b/test_link_flag.cpp
new file mode 100644
index 0000000..82e8128
--- /dev/null
+++ b/test_link_flag.cpp
@@ -0,0 +1 @@
+int main (int argc, char **argv) { (void)argc; (void)argv; return 0; }
diff --git a/test_restrict.cmake b/test_restrict.cmake
new file mode 100644
index 0000000..4dae29e
--- /dev/null
+++ b/test_restrict.cmake
@@ -0,0 +1,24 @@
+cmake_minimum_required(VERSION 3.7.1)
+
+macro(test_restrict VARIABLE)
+    if (NOT DEFINED TEST_${VARIABLE})
+        message (STATUS "checking for restrict keyword")
+        FOREACH(KEYWORD "restrict" "__restrict" "__restrict__" "_Restrict")
+            IF (NOT TEST_${VARIABLE})
+                TRY_COMPILE(
+                    TEST_${VARIABLE}
+                    "${CMAKE_BINARY_DIR}/CMakeTmp"
+                    SOURCES "${CMAKE_SOURCE_DIR}/cmake/test_restrict.cpp"
+                    COMPILE_DEFINITIONS "-DKEYWORD=${KEYWORD}")
+                set(__test_restrict_last ${KEYWORD})
+            ENDIF (NOT TEST_${VARIABLE})
+        endforeach(KEYWORD)
+
+        if (TEST_${VARIABLE})
+            message (STATUS "checking for restrict keyword - ${__test_restrict_last}")
+            set(${VARIABLE} ${__test_restrict_last} CACHE INTERNAL "restrict keyword" FORCE)
+        else (TEST_${VARIABLE})
+            message (STATUS "checking for restrict keyword - not found")
+        endif(TEST_${VARIABLE})
+    endif(NOT DEFINED TEST_${VARIABLE})
+endmacro(test_restrict)
diff --git a/test_restrict.cpp b/test_restrict.cpp
new file mode 100644
index 0000000..a586598
--- /dev/null
+++ b/test_restrict.cpp
@@ -0,0 +1,15 @@
+typedef int * int_ptr;
+int foo (int_ptr KEYWORD ip) {
+    return ip[0];
+}
+
+int
+main (int argc, char **argv){
+    (void)argc;
+    (void)argv;
+
+    int s[1];
+    int * KEYWORD t = s;
+    t[0] = 0;
+    return foo(t);
+}