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This allows makefiles to refer to the parent directory in an OS-neutral way.

Typically useful for libraries where you have both types of target, and you
want the application build to contain function names (for meaningful
backtraces) but the module build not to (to save ROM space). This is
achieved as follows:

* CAPPFLAGS and CMODFLAGS contain additional flags to be passed to application
  and module builds, respectively

* C_FNAMES is initialised to a compiler-agnostic build switch to enable
  function names in the binary

Therefore a master makefile will often use the line
CAPPFLAGS = ${C_FNAMES}
although CAPPFLAGS and CMODFLAGS are not limited to this usage.

C_NOWARN_ASSIGNMENT_AS_CONDITION to suppress warnings about assignments within
condition tests in `if` statements

C_NOWARN_NON_ANSI_INCLUDES to suppress warnings about use of angle brackets
for #include headers not defined by ISO/ANSI

Version 7.50. Tagged as 'BuildSys-7_50'

StdTools: new symbol SUFFIX_HEADER: '.h' for GNU make, undefined for amu; useful for generating filenames of generated headers
StdTools: new symbol EXT: filename extension separator character
CModule: ROM_SYMS: now defined conditionally, permitting it to be overridden higher up the master makefile, to match SA_LIBS and ROM_LIBS

Version 7.47. Not tagged

Don't try and be clever using Build$Path, just refer to touch directly (since uses of it elsewhere don't have *Run).

Version 7.39. Tagged as 'BuildSys-7_39'

Those RAM loading modules which pick from VersionNum and insert into their Messages would create a new Messages file with a new date every time they are built. Because the tools to put these in ResourceFS also capture the file's datestamp (via :FLOAD: :FEXEC: in objasm, or via resgen for C modules), you don't create binary identical copies on two successive builds despite the same input source.
Add a ${TOUCH} step to copy the reference time stamp to the generated Messages file.

Requires Library-1_96 or later for Touch.

Detail:
  ModuleDB:
  * Correct capitalisation of resgen's TARGET to match its main source file
  GNUmakefiles/AAsmModule:
  * Targets now given ,ffa filetype suffix
  * Support source directory layouts s/<subdir>/<leaf> as used by the
    kernel and printer drivers - define SYMLINK_EXT_FIRST to enable
  * Prevent relinking when running make on an up-to-date component due to
    a difference between amu and GNU make's handling of double-colon rules
  * Support linking with GNU toolchain
  * Fix installation rule (mixup between MERGEDMDIR and MERGEDRDIR)
  * Support up to 16 assembler and 8 C-from-assembler headers, up from 3
    of each (here's looking at you, kernel) - long-term, it might be worth
    changing this to a scheme like that used by CModule to remove any
    limits
  * Fix C-from-assembler exports to have .h suffix
  GNUmakefiles/AppLibs:
  * Define INCLUDE_OSLIB to permit OSLib header search paths to be
    specified in an OS-agnostic way
  GNUmakefiles/CApp:
  * Prevent relinking when running make on an up-to-date component due to
    a difference between amu and GNU make's handling of double-colon rules
  GNUmakefiles/CLibrary:
  * Prevent rearchiving when running make on an up-to-date component due
    to a difference between amu and GNU make's handling of double-colon
    rules
  * Don't use .hdr suffix on exported assembler header files
  * Correct order of dependencies for export_libs phony target
  GNUmakefiles/StdTools:
  * Definition for the module filetype suffix
  * Add LDBIN tool for GNU/Norcroft-agnostic binary link, useful for
    linking position-independent binary code, such as relocatable modules
    (i.e. ones that don't require the linker to create a __RelocCode
    function)
  * FAPPEND function now works if the same file is used for the
    destination as for one of the sources (this is used by CModule)
  GNUmakefiles/CModule, ModStdRule, ModuleLibs:
  * Finally created cross-compilation versions of the last major shared
    makefiles! Warning: these have received limited testing to date.
  Makefiles/AAsmModule:
  * Support up to 16 assembler and 8 C-from-assembler headers
  Makefiles/AppLibs, ModuleLibs:
  * Define INCLUDE_OSLIB
  Makefiles/StdTools:
  * Add LDBIN tool


Version 7.24. Tagged as 'BuildSys-7_24'

Tagged as BuildSys-6_70.

Components (ROOL CTools):
  * Added new components (ITable, BlendTable, RTC) for exports
  * Switch to using Install: rather than <Install$Dir> to help CLX
  * Replace CToolsCD component with DDE component
ModuleDB tweaks:
  * Added the (closed source) DDE resources component
  * Added a component for BuildSys itself (so DDE can get the Makefiles)
Shared makefile tweadded ERASECVS to the standard tools
  * Added a verbose copy flags CPVFLAGS for big copy operations
  * Added "install" rule for debug app builds (amu install INSTTYPE=debug)

Version 6.53. Tagged as 'BuildSys-6_53'

AAsmModule:
 Remove SA_DEBUG override, instead use ASDFLAGS like CModule does.
CModule:
 If the target is 'debug' allow CMHGDFLAGS to pass extra defines into CMHG, this avoids the common problem of having to have 2 CMHG files and select between them.

Other - sync the messages token check/copying, use ${NOP} and ${FAPPEND} and ${DO}, and od.${RES_OBJ} isn't dependent on ${DIRS} since it already has that when creating o.${RES_OBJ}.

Version 6.50. Tagged as 'BuildSys-6_50'

Drop 2 tools tlink - a long since abandoned special tool used to link the toolbox modules against TinyStubs around RISC OS 3.50 era, no 32 bit version has ever been made, so by implication it's not being used aasm - the sources were lost some time in the 1990's, and hasn't been supplied as part of the DDE for over a decade

Documentation updated to reflect current tools.

Version 6.46. Tagged as 'BuildSys-6_46'

Detail:
  Makefiles/CApp:
  * Naming of object file variables rationalised in line with CModule
  * Noted that INSTAPP_VERSION files must also be present in INSTAPP_FILES for
    compatibility with GNUmakefiles - requires changes to individual top-level
    makefiles, but not BuildSys
  Makefiles/CLibrary:
  * Naming of object file variables rationalised in line with CModule
  Makefiles/CModule:
  * Removed unused variable OBJS_
  Makefiles/StdTools:
  * Retired TIDYDESC
  GNUmakefiles/AppLibs:
  * Add CONLIB, RMVSN, SYNCLIB
  GNUmakefiles/CApp:
  * Default definition of INSTAPP
  * Naming of object file variables rationalised in line with CModule
  * CLEAN_DEPEND removed, clean made a double-colon rule (it's worth noting
    that such additional clean rules are now only executed from the component's
    top-level directory: this was not true for the old extra_clean rules that
    this replaces, in the GNUmakefiles case)
  * Rename of INSTALLAPPFILES to INSTAPP_FILES
  * Rename of INSTALLAPP_DEPEND to INSTAPP_DEPENDS
  * Insertion of component version into Desc files now done using AwkVers
    script rather than the C preprocessor (note, will require editing of Desc
    files to comply). Also supports versions in Messages and !Run files,
    controlled by new variable INSTAPP_VERSION
  GNUmakefiles/CLibrary:
  * Naming of object file variables rationalised in line with CModule
  * clean rules now only executed from the component's top-level directory, as
    with CApp
  GNUmakefiles/StdTools:
  * Added INSERTVERSION (AwkVers), retired TIDYDESC
  * Perl scripts now explicitly passed to perl - no need to chmod +x the
    scripts in RiscOS/Library
  * asasm/objasm include paths and APCS/Machine/UserIF predefines set to match
    Makefiles
Admin:
  Tested in a CTools build

Version 6.32. Tagged as 'BuildSys-6_32'

AAsmModule:
 Comments sync'd with implementation
ModuleLibs/AppLibs:
 Add the RMVersion library
CApp:
 Now APP_OBJS and APP_DBG_OBJS don't need the '.o' suffix in common with OBJS and DBG_OBJS
 Changed insertion of version numbers to be common for Messages/Obey/Desc files through new 'INSTAPP_VERSION' dummy rule
 INSTALLAPP_DEPEND renamed to INSTAPP_DEPENDS to match other INSTAPP_stuff
CUtil:
 Use addprefix'd APP_OBJS
StdTools:
 Default SQUISHFLAGS now set
 Added INSERTVERSION


Version 6.20. Tagged as 'BuildSys-6_20'

Not tagged.

I'm hoping to get to the bottom of the (very tricky to reproduce in a
sensible amount of time) crashes during Disc and DiscDev builds.

Version 6.04. Not tagged

Version 6.03. Tagged as 'BuildSys-6_03'

WIPE is now the same as XWIPE, rather than the annoying "-wipe".

Version 5.36. Tagged as 'BuildSys-5_36'

Detail:
  * Some subtle bugs can be caused by including shared makefiles in the
    wrong order. To try to prevent further problems, and simplify main
    makefiles at the same time, CApp, CLibrary and CModule now include the
    makefiles they depend upon themselves, in the correct order: generally
    speaking, all macro (re)definitions should be before rule definitions.
  * Added sentry macro definitions to each makefile. These can be used to
    avoid repeated inclusion of makefiles - particularly important now that
    CApp, CLibrary and CModule do additional includes. This removes the
    majority of cases where amu produced warnings about multiple inclusion;
    a few components remain where this is still the case, but these
    warnings are harmless. If they bother you, simply remove the
    now-superfluous include statements from the relevant main makefile.
  * Created a CUtil shared makefile, for building transient utilities. The
    'C' in the name is more for consistency with CApp/CLibrary/CModule than
    anything to do with the 'C' language, since all of these makefiles work
    equally well for assembler and 'C' - the 'C' is for historic reasons.
  * Tweaked the debug rules in CApp to avoid harmless but annoying linker
    warnings about stubs being included twice.
  * Added several new default switches to ASFLAGS. These enable us to start
    making assembler source files work under a cross-assembler, because
    statements like
        GET  Hdr:Macros
        GET  Hdr:Machine.<Machine>
    are not portable, and tweaking the cross-assembler to understand these
    types of constructs would not be pretty. Instead, with the extra
    command line switches now introduced, you can use
        GET  Macros
        GET  Machine/$Machine
Admin:
  Tested in a ROM build

Version 5.12. Tagged as 'BuildSys-5_12'

Detail:
 CApp:
  * New variable CLEAN_DEPEND is now the preferred way to specify additional
    clean actions because GNU make doesn't have an equivalent to amu's :: rules
  * Can now indicate preference to use C++ linker options using LINK_TYPE
  * Gains install phase support:
    + INSTALLAPPFILES lists the files to be copied, effectively specified
      relative to LocalRes$Path
    + Adopted INSTTYPE concept from DDE makefiles for cases where executable
      and support files need to be installed to different locations
    + Unusual cases can override this implementation using CUSTOMINSTALLAPP
      and/or CUSTOMINSTALLTOOL

  CLibrary:
  * New variable CLEAN_DEPEND is now the preferred way to specify additional
    clean actions because GNU make doesn't have an equivalent to amu's :: rules
  * -o is no longer a mandatory argument to libfile - now in ARFLAGS rather
    than used explicitly

  DbgRules / StdRules:
  * Macroised some Norcroft-specific features

  HostTools:
  * Clean phase support was incomplete

  StdTools:
  * A few additional tool definitions
  * Added macro definitions for common C options
  * C's enable-warnings and suppress-function-name-embedding options now on by
    default because they're usually (maybe even universally?) used - it won't
    hurt if they're specified again by existing makefiles
  * C++ now has equivalent INCLUDES and DEFINES variables, and the standard C++
    headers are on the default include path
  * SEP is defined as the directory separator character and can be used from
    top-level makefiles in a platform-independent way

  Functionally equivalent versions of the following makefile fragments
  have been developed so far for executing on a Posix build host:
    AppLibs, CApp, CLibrary, DbgRules, HostTools, StdRules, StdTools
  These suport native compilers (when APCS=Host) and cross-compilers,
  and GCC (when TOOLCHAIN=GNU) and Norcroft toolchains - typically these
  environment variables would be selected by running an Env file.

Admin:
  Tested by building as many as possible of the DDE components on RISC OS
  and on Linux, using native and cross compilers, and using Norcroft and
  GNU toolchains.

Version 5.01. Tagged as 'BuildSys-5_01'

Fixed to point at the (new) location of the zip tool and added some useful
parameters - this is safe because nothing in the build tree was using
this definition of ZIP anyway.

Version 4.81. Tagged as 'BuildSys-4_81'

Detail:
  Some users reported problems building the sources if they had other
  installations of perl on their build machine. The build system was using a
  mixture of "perl" and "<Perl$Dir>.perl" to invoke the interpreter, and
  sometimes but not always using "do" to expand system variables on the
  command line. This has now been standardised to use "do <Perl$Dir>.perl in
  all cases, and where possible, to use the makefile macro ${PERL}.
Admin:
  Checked that a Tungsten build still works on a build machine with no other
  perl installation. "perl" was aliased to an error to ensure it wasn't used.

Version 4.73. Tagged as 'BuildSys-4_73'

This represents the version released in the Batch 4 "bbe" tarfiles.
Tagged as 'Batch4'