Start to move enumeration declaration checking to its own class.

Fix comments and code alignment

Fix warnings previous change introduced when compiling with gcc.

Fix some important clang++ warnings.

Allow use of type#value syntax when defining default initial value inside a TYPE..END_TYPE declaration.

Do datatype verification of fully qualified enumerated values (e.g. ENUMTYPE#enumconst)

Add datatype checking of enumeration data type declarations.

Print const values of symbol.

Fix code generation of enum value constants (this is a temporary fix - it will be followed by a code cleanup).

Fix bug in datatype checking of enumerated datatypes delcarations.

Fix datatype checking of enumerated datatype declarations. We now follow the fill->narrow algorithm correctly.

Add method to determine the id (name) of a datatype.

Change the base datatype of enumerations to an enumerated_type_declaration_c (for named types!)

Change the public interface to debug functions.

Check for errors in enum datatype declarations. (This is not yet complete as it will not yet stop the compilation process if these errors are found)

Fix one more bug - upper_bound() works a little differently to what we want!

Fix more bugs in dsymtable_c (real semantics of std::multimap::lower_bound is not what was assumed!)

Fix counting bug in dsymbtable_c

Use duplicate symtable instead of symtable for enum constant value table (this will later allow us to detect semantic errors in IEC 61131-3 source code)

Move the enumerated_value_symtable to fill_candidate_datatypes_c, since it is only used there!

Make search_base_type_c a singleton!

Start datatype checking of variable declarations (for now, only seting symbol.datatype of enumerations)

Do datatype checking of enum values defined inside anonymous enumeration types (i.e. enum types defined inside a VAR ... END_VAR daclaration).

Added support for testing BCD value validity in BCD_TO_UINT function

Fixed bug in DATE_AND_TIME_TO_TIME_OF_DAY and DATE_AND_TIME_TO_DATE when date and time is before 1970-01-01-00:00:00

Fix warning message when declaring global variables in configuration

Removed unused variable

Replacing libc time functions for date <-> timespec translation by platform and localtime independant implementation

Removed files generedted by autoconf, should not be in repo

Fixed timegm usage incompatible with mingw, reverted to mktime in case mingw is detected

Fix in accessor undefined init methods for function block global instances

Fix undefined function toupper in iec_std_lib

Adding support for declaring function block instances as global and external variables

Fix DATE conversions standard functions

Fix definition of BCD to ANY_UINT and ANY_UINT to BCD conversion standard functions

Fix indentation in SFC SL qualifier code generated

Fix indentation and unused variable warning in SFC generated code

Fix pragma with double bracket token stripping

Fix some warning about loss of precision data in iec_std_lib.h file.

Fix typo.

Remove deprecated class search_constant_type_c

replace call to search_constant_type_c with symbol.datatype

Removing several warning in iec_std_lib.h

Code formating only.

Fix stage4 for compare expressions.

Prepare to delete search_constant_type_c -> Move the static variables from search_constant_type_c to get_datatype_info_c

Remove no longer needed search_il_operand_type_c

Also force_narrow IL instructions inside IL expressions, i.e. inside parenthesis.

Correctly generate C code for IL expressions, i.e. IL instructions inside parenthesis.

Fix bug when handling IL expressions (i.e. IL instructions inside parenthesis).

Delete debugging code, introduced by mistake in previous commit.

Fix handling of IL parenthesized expressions in generate_c_il_c

Fix processing of TIME literals (submited by Andreas)

Fix flow control analysis of IL simple instructions (i.e. IL instructions inside parenthises!)

Comment out invalid assertion.

Code cleanup: get the datatype of each entity off symbol->datatype (set in stage3 datatype checking), instead of determining it again in stage4. (NOTE: handling of IL parenthesized expressions is not working! Will be fixed later.)

Major code cleanup: IL code generation now uses symbol.datatype (filled in during stage3 data type checking) instead of determining the symbol's datatype by itself.

Do not repeat narrow algorithm for ST code, and better comments.

New visitor classes missing from previous commit.

Remove line printing debug info.

Add classes to print status of AST (use only for debugging!)

Remove all remaining NULL (undefined) datatypes from IL code.

Move is_datatype_valid/equal() to get_datatype_info_c

Fix bug related to support of SAFE datatypes.

Set datatype of il_intruction_c objects containing an ST operator.

Delete unused variables.

Use doubly linked connections for flow control graph (will be used later).

Remove deprecated search_expression_type_c

Deprecate use of search_expression_type_c (prepare for complete removal!).

Deprecate use of search_expression_type_c (prepare for complete removal!)

Deprecating use of search_expression_type_c, so it may later be deleted!

Merge

Add new get_datatype_info_c (preparing to remove search_expression_type_c)

Delete declaration of unused & undeclared functions.

Delete class elements that are not used (clean up code).

Add check whether external var matches to global var.

Also check FB passed as parameters in FB/Function calls (Thanks Andreas!)

Minor changes needed to build with pedantic flag.

Also check external/global variable consistency in configurations and FBs.

add method for printing class_name. USE ONLY FOR DEBUGING!

store POU reference to POU declaration instead of global var declarations.

Start declaration check class.

Start declaration check class.

Adjust coding style.

list_c: initial capacity. ERROR_MSG(msg,...) supports optional arguments now.

Deleting datatype checks no longer needed (with a view of making search_expression_type_c redundant).

Start adding support for data type checking of enums.

Remove comment no longer valid since introduction of constant folding.

Add some comments.

Update configure script.

More precise handling of const value status.

Fix bug in checking array ranges.

Add more info to error messages.

Allow the use of PRId64, PRIu64 and PRIx64 printf formating macros globally.

Merge.

Fix constant folding: now handles INT_MIN and neg_integer_c correctly.

Replace test bison version without bash regular expression.
Tested on OS X 10.8 - Linux Ubuntu 12.4 - MinGW.

Fix Segmentation Fault FB var declaration in a single list.

Add some comments.

Fix some warning about loss of precision data in iec_std_lib.h file.

Fix bug with NE function for STRING variables

Fix bug in code for pragma with double brackets

Merged

Adding support for direct array declaration in structure element declaration

Added double curly braces for pragma (kept single curly braces for compatibility). Added macro def and undef surrounding pragma to simplify user code. Moved useless comment from generated code back to code generator.

Fix bug with task interval using fixed_point value for duration items

Adding error message when task interval value is not supported

Adding error message when task interval value is not supported

Fix bug SFC action index declarations were different in POUS.c and VARIABLES.csv when boolean variables are used as action name in step action association

Fix generated code when using boolean variable as action name in step action association

Fix bug in SFC generated code. Action state was declared in the list of variables to debug, but wasn't stored using structure with flags. This error had side effects that makes Beremiz debug crash.

Adding support for P0 and P1 qualifiers and fixing code generated for SL qualifier

Fixed VARIABLES.csv, was broken when using enumrated types

Merge with c2546c6e0cfa5ad55b288895f17f1b9f2a228f3b

Moving function to correct location (formating only).

Fix bug in code generation for FB IN_OUT structured parameter.

Add check bison version in configure.ac file.
To build correctly matiec we need bison greater or equals than 2.4 version.
Now the "configure" script is able to check if system has correctly requirements.

Remove remaining signed/unsigned comparison error messages when compiling.

Remove warning about comparisons between int and unsigned int.

Support for data types of STEP.T and STEP.X in SFCs

Remove dead code.

Change code formatting (alignment)

Aloow use of SFC STEPs as variables.

Check lvalues in expressions passed to Function/FB IN parameters.

Fix comment (bug found by Manuele).

Remove warning about redefining "__STDC_LIMIT_MACROS" (bug found by Manuele).

Constant folding for IL.

update comments.

fix bug: remove REAL from candidate datatypes when real constant has overflowed.

signed integer limits do not affect ANY_INT constant values.

comment out un-used code.

cleaning up code. Changing HUGE_VAL to INFINITY.

Cleaning up the code.

Clean up the code a little.

Fixing includes to define INTxx_MAX etc...

Add remove_from_candidate_datatype_list method using constant_folding results.

fix typo.

fix parsing of non base 10 constant values.

determine const value of hex, octal and bin literals correctly.

fix array bounds check.

Fix stupid typos (in calculating array dimension)!

Add file missing from previous commit.

Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc

Add independent extract_integer() function (preparing to remove extract_XXX() from absyntax_utils.cc)

Clean up code (remove parsing of integers in stage 4).

Fix literal MACRO gcc compliant.

Add 'dimension' parameter to subrange_c, fill it correctly, and use it.

extract_int64() must not handle negation operation (was doing it incorrectly for INT64_MIN!)

Add support for -INT64_MIN values in literals.

Make compiler portable (do not assume int64_t is long long int)

Add missing set overflow flag.

Fix extract_integer_value.
Now we handle signed and unsigned in different mode.
(Thanks to Andreas)

Fix typo (thanks Manuele)

Remove potential access to NULL pointer.

fix error message.

Fix array index bound check to consider uint64 indexes/limits.

Fix structure initialize.

Add check array out of bound.

Code for debugging const_value annotations in abstract syntax tree.

Fix 'overflow' detection for real64.

small bug fix.

Fix compare expression in constat folding class.

Fix extract_real (thanks Manuele), and add check for overflow.

cleaning up the code...

Fix remaining overflow checks.

remove incorrect include file.

Correctly implement MOD operation and overflow checks (still missing uint * / MOD).

Re-insert errno=0 before calling strtoXX() (thanks go to Manuele)

cosmetic changes.

Add data structure for storing overflow of constant values.

make the compiler platform independent (i.e. no longer assume sizeof(double)==8).

create extract_real_value() in absyntax_utils. NOTE: overflows not yet handled!

Update constant folding: fixing minor bug.

Fix a few bugs of previous commit.

Start constant_folding class.

little typo in last commited code
add if(is_bool_type(sym)) this->bool_type->accept(*this) in generate_c_il_c::visit(il_default_variable_c*)
to get .BOOLvar instead of .FALSEvar resp. .TRUEvar ..

Change return data type of array_dimension_iterator_c.next()

Fix SFC stage4 error.

Renamed class, remove unused code, delete allocated objects.

Start sematinc range check class.

Located variables may have other data types besides ANY_BIT.

Add verify_is_lvalue to control_variable in for_statement.

Remove useless code, and replace with assertion.

Fix bug: initialise un-initialised variable.

Delete incorrect comment.

Add some comments...

Add high level comments.

Fix comment.

Fix the previous commit: check for errors in expressions used as subscripts.

Fix data type check array subscript field.

Merge changes.

Fix parsing os TIME literals & rename the extract_integer() function.

Fix generation of output for iec2iec.

Do not compile deleted files...

Do not compile deleted files...

ReDelete files - used in old method of supporting standard functions.

Remove file (used for old method of supporting standard functions).

Add TODO list!

Delete unecessary variable.

Fix __dt_to_timespec primitive function.
Set tm_isdst = 0 to disable DayLight Savig Time.

Fix __dt_to_string primitive function.

Fix code generation about __INIT_GLOBAL_LOCATED.

Change constants into enums.

Add lvalue checking for IL function and FB invocations.

Fix comment.

Add clarifying comment.

Remove access to NULL pointer.

Make temporary fix to is_complex() method.

Fix comment. (thanks go to Manuele for pointing it put).

Stop lvalue checks after finding an error in the expression.

Remove erroneous check for S1 and R1, and add missing declrataion.

Start implement lvalue check in IL instruction.

Add lvalue check on fb invocation.

Literals are also part of expressions!

Implement check_assignment_to_expression in lvalue_check_c class.

Remove potential access to NULL pointer.

Start having nicer stage 4 error messages.

Improve usability command line under windows.

Ignore trailing EOLs when determining symbol location.
(Makes for niver error messages)

Add comment.

Fix Segmentation fault in check_assignment_to_output lvalue method.

Remove deprecated status for ANYTIME operations.

Produce similar error messages in stage2 and stage3.

Fix bug when handling code with data type errors.

Fix printing of data type errors in while and repeat statements.

Add lvalue check for non formal function invocations.

Fixing check for assingment to FOR control variables.

Moving get_var_name_c into its own file.

Fixing check for assignment to output variables.

Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)

Add lvalue check class.

Determine the modifiers (CONST, REATAIN) used when declaring a variable.

Fix typo in comparison expression.

Removing code from search_varfb_instance_type_c (use search_var_instance_decl_c instead).
(Preparing to delete search_varfb_instance_type_c in the future!)

Fix bug by expanding permissible data input of search_var_instance_decl_c
(this will also prepare us for removing search_varfb_instance_type_c in the future)

Edit formating and delete unused code.

Start data type checking of var declarations (including direct variables!)

Delete incorrect comments I had inserted previously (confusing EQ and NE functions)

merging with Lauren't changeset.

merge with Laurent's changeset (essentially ignore all changes).

merge with Laurent's changeset (essentially, ignore all changes).

merging with Laurent's changes.

merging with Laurent's change.

merging with Laurent's revision 55b074ea7255 (essentially ignoring all changes)

Add coment warning about incorrect implementation of the NE standard function.

merging with Laurent's patch.

Print correct error message when handling IL function calls.

Edit error message.

Add EXPT widen table.

Some stupid code cleanups.

Some code cleanups.

Clean up the code.

Fix error messages of il function calls - it now prints out location info of first parameter.

Clean code for printing errors in expressions.

Clean code for comparison operations & operators.

Cleaning up XORN, ANDN, and ORN operator code.

Cleaning up some code.

Add 'widen' tables for AND, OR and XOR operations.

Add MOD widening table, and some code clean-ups.

Re-organizing the code.

Change setting of deprecated_operation from fill to narrow_candidate_datatypes_c.
Expand widening tables for ADD, SUB, MUL and DIV.

Clarify some details in the comments.

Add check widening status for IL operator.
Fix check widening status for ST expression.

Fix remaining 'widen' tables.

Fix some 'widen' table entries.

Add a TODO comment.

Clean up code, and add support for 'safe' version of literals.

Bringing comment up to date.

Semantic verification of NOT operator.

Fix bug in building structured variables.

Delete unecessary copy_candidate_datatype_list() function.

Delete no longer needed copy_candidate_datatype_list() function.

Narrow IL lists twice, in order to handle JMP to labels before the JMP itself.

Do not allow duplicate values in candidate datatype list.

Handle JMP to labels preceding the JMP instruction itself.

Correctly handle JMP and RET IL operators in flow control analysis.

Fix filling candidate datatypes of JMP operations

Remove spurious printf()s, used during debugging session.

Add missing files.

Continue adding support for semantic verification of JMP and RET.

iAdd warning for deprecated operations.

Change prev_il_instruction to a vector<>

Some small cleanups.

Add support for semantic verification of CALC, CALCN, etc..

Finish support for semantic verification of IL paranthesised expressions.

More changes for support of semantic verification of il_expressions

Start of support for IL expressions (parenthesis).

Cleaning up the code.

Fix a few more bugs related to FB/function calls in IL.

Semantic verification: Add compatibility check for parameter direction in function invocation.

Add support for semantic verification for implict FB calls in IL (e.g. PV ton_var)

Start of support for semantic verification of FB calls in IL using special IL instructions.

Delete some comments.

Change name help function.

Update comments on general architecture.

Narrow IL code backwords, so as to correctly handle invocations to overloaded functions from IL code.

Code cleanup.

Add printing of semantic errors when calling FB from IL.

Fix typo error in some il visit in fill_candidate_datatypes_c class.

Add semantic verification of FB calls in IL (not yet complete - missing printing of errors!)

Add support for semantic verification of function calls in IL.

Add TODO comment, and delete unused debugging code.

Delete un-used code.

Change negation expression (neg_expression_c) to only allow signed data types.

Move elementary_c::to_string() to datatype_functions.cc/hh

Add, to types symbol table, string datatypes with limited length (my_string_type: STRING[33]) (Thanks Andreas!)

Correctly return the initial value of a string datatype, with limited length (STRING[33] := 'hello')

More detailed error messages for FB invocations in ST.

More detailed error messages in function invocations in ST.

Fix bug in analysing real literals (thanks Andreas!)

Remove debugging messages, and code cleanup.

Better error reporting in function invocations, and in invalid literal values.

Better identification of erros in function/FB invocations.

Print error messages when datatype erros found in ST function/FB calls.

Continue checking data type compatibility inside expressions used to pass paramters to invalid function/FB calls

Adding support for semantic verification of FB calls in ST.

Delete wrong comment.

Add support in stage 3 for checking function invocations in ST.

Fix search_varfb_instance_decl to be able to find variables and FB when only given an identifier.
Fix handling of FB calls in stage3.
Start handling of function invocations in stage3.

Changing code indenting.

Add fill candidate method for fb_invocation_c symbol.

Re-write of stage3 code (done by Manuele and I), re-write of search_varfb_instance_type_c (done by myself), and several other bug fixes.

Merging with Laurent's repository.

Fix YYLTYPE declaration.

Merging with Laurent's repository.

Add list of things we must check for in stage 3 (TODO list!)

Fix bug with InOut variable of structured type

Fix bug while using complex type variables in Function and FunctionBlock interface

Fix bug while using complex type variables in Function and FunctionBlock interface

Fix bug with complex type inout variables while generating variable list

Fixing bug in inlinefcall when a transition is in ST and contains literals

Fix bug in code generated for MUL function

Fix bug with overloaded function due to literal input values

Fix bug wrong code generated when, in a pou, a located variable has the same name than a function block instance input variable

Fix bug pointed structure not declared for directly derived datatypes

removed forgotten prototype in __INIT_EXTERNAL accessor, causing warning ant build time

Merge with Edouard's modifications

Fix STEP and ACTION structure initialization value in SFC

Applied anonymous contribution RTC, '[Beremiz-devel] RTC function', 29/06/11

Fix bug with functions like LEN and TRUNC that have overloaded return type for same inputs type

Fix issues in standard library with MUX, MOD, NE and convertions to BOOL

Adding Common_Ticktime to informations printed in VARIABLES.csv file

Fixing bug with external variables refering to global variables defined in configurations

removed useless extern func declaration in __INIT_EXTERNAL, producing warning during build of POUS.c

Fixing bug in generated code for complex type external variable

Fixing SUB standard function defined in standard library

Fixing generated code for global variables. Adding support for defining global variables with complex type
Fixing bug preventing to generate SFC transition with IL body

Fixing bug in all SUB function definitions in standard_functions.txt

Fix bug when using enumerated type in equ_expression or notequ_expression

silenced warning on X86_64 build by casying numerical operand of snprintf

Fix bug in generate_c_inlinefcall. Was not handling textual SFC elements

Fix code generation of FOR loops. Now handles negative values of BY correctly.

Fix semantic verification of enumerated data types.

Adding a line to a comment. Does not change any code.

fixed signedness warning on string slicing funcs in std lib

Fix bug generate_c_inlinefcall in inline function name generated

Fix bug in parser while trying to use IL operator like S1, R1, etc... as standard function block interface variable in structured_variable syntax and bug in code generator while generating code for assignment of function block interface variable using structured_variable syntax

Fix bug in code generation of directly declared array variables that generate wrong code when using located variables in a program POU

Fix bug in generate_c_inlinefcall.cc that prevent to use extendible standard functions

Fix bug in definition of CONCAT standard function in iec_std_lib.h

moved declaration __STR_CMP to prevent warning

Adding support for compiling direct array specification inside variable declaration

Making case statement code generated safer

Merge with 01068ccb73b202b2872d4117ad01984bac956cbb

Fix make on system without mercurial installed.

delete code no longer needed.

Implement get_type_decl(), as it seems Manuele will need it later...

Cleaning up: Getting some sense into the code handling structures.

Add automatic HG changeset id information in "-v" param

Add iec2iec building in the project Makefiles.

Update which files to ignore due to new autotools building environment.

Add checks for undefined structure elements used IEC 61131-3 source code being compiled.

Ignore underscores when extracting value of integer.

Deleting unused code.

Removing Makefiles made redundant by autotools.

fix bug report email address.

Add print version command line option.

Remove debugging printf() added by mistake in previous commit.

Print error messages when data type errors in ST expressions are detected.

Include (again!) the declaration of standard functions (incorrectly removed -again- in previous commit)

Add support for '**' (power) operator in ST expressions

Some more comments on how to build, and correcting name of README.build file.

Include the declaration of standard functions (incorrectly removed in previous commit)

Merging with Laurent's repository.

Fixing automake configuration to work properly with flex and bison.

Building compiler with autoconf. Thanks go to Matteo of sirius-es.it

Support for semantic verification of calls to standard functions.
Removing files no longer required.

Support for semantic verification of calls to standard function calls.
Adding missing files in previous commit.

Support for semantic verification of calls to standard functions.
This commit makes a fundamental change in the way standard functions are handled by the compiler.

Fixing exponentiation used with symbol **

Fix bugs in exponentiation

Fix case statement in ST, adding support for enumerated types

Adding BYTE operators visit functions in inlinefcall

Fix bug with DIV and MOD operator in IL code generator

Fix bug in suffix of inlinefcall call in ST and IL

Remove inclusion of missing file in lib

Commiting merge with Mario's repository

commiting merge with Laurent's repository

changing 'make' to '$(MAKE)' so other make tools (e.g. gmake) may also be used.

Replacing extern declaration with #include of apropriate header file

Adding some comments, and removing a check for a semantic error in code being compiled.

Fix bug with inline function call in POU programmed in IL

Fix bug in function calls with literal parameters

Fix makefiles when not using make as make tool

Fix bug on initialization of temp variables not using setter

Fix bug when trying to find the type of a NULL symbol

Fix bug in inline function calls when using function with undetermined type interface with literals as input

Fix warnings when compiling matiec

Fix warning on nop statement at the end of function_block and program generated code

Adding double underscore in computed enumerated value to avoid conflict with other user defined identifiers

Add support for finding type of a constant enumerated value and managing conflict between same identifiers defined in different enumerated data types

Fix bug in declaring variable of enumerated type

Fix what I think is a bug (has not yet manifested itself).

Merging with Lauren't recent change.

Merging two previous commits.

Clean up some code.

Fix bug with array attribute in structure declaration

Add better comments, and change name of functions to clarify what they do.

Remove incorect debugging assertion.

Skip CONFIGURATION declarations in stage 3 for now, so semantic analysis does not stop when a configuration is encountered.

Fix bug when generating initial value for function return type when it is a complex type

Fix bug in debugging variable list compilation with structure and array disabling

Fix bug with TRUNC function and with type conversion functions called with constant as parameter

Allow use of ENO keyword in structured variable field selector.

Fixing REAL_TO_INT conversion (behaved like a trunc and not like a round)

fixing INSERT function: was inserting into incorrect position. (submitted by Manuele)

Fix bug when generating integer with leading zero (octal value for C compiler)

Allow [EOL] after a label in IL.

Fix bug when using an enumerated or subrange type to define a structure element

Fix bug when declaring data type directly derived from array type

Fix conversion of binary digits to hex, when generating code.

Fix missing '(' when declaring new simple derived data type.

Ignore underscores in decimal integer constants when determining size in bits...

When checking semantics of expressions, skip semantic checking of data type definitions
(not yet supported). If we don't skip, all subsequent POUs would not be checked.

Fixing algorithm that determines bit size of constants containing underscores.

Merging with Edouard's version

Fixing bug related to setting array variables with values coming from other variables
(e.g. X[0] := Y;)

Added __IEC_OUTPUT_FLAG, to mark variable whose forcing implies refresh on eache cycle.

Fix bug when debugging located variables of type memory (%M) for all variable classes

Merging with Edouard's changes

Fixing code generation of array indexes in Function Blocks.

Commiting merge with Laurent's recent dead code removal change.

Adding fflush capabilities. It is sometimes usefull when debuging the compiler...

Adding missing semicolons.

fixed build error with gcc 4.5.2

Merged with Edouard's modifications

Fix bug when debugging located variables of type memory (%M)

Removed dead code

Fixing implementation of CU, CD, and CUD in standard library.

Deleting dead code.

Merging changes.

Added tracking of order by which tokens are processed by lexical analyser.
This helps in correctly formating error messages when constructs begin in one file, and end in another.

Adding tracking of filename in which token is located.

Reverted semantic error message so that Beremiz can parse them and that user can double-click on error message to open related POU and select the faulty line.

Fixing error message incorrectly changed in previous merge.

fixing C code generation of return_statement_c and exit_statement_c

merging the Edouard's version.

fixing exit_statement_c: produce 'break' instead of 'exit(0); (Thanks to Manuele)

Fixing code generation of standard conversion functions.

Re-generated std lib related code, with updated headers, updated all forgotten headers

Merged matiec library headers update from Mario to LGPL

Changing to LGPL for library functions.

Updating origin and license info of library fuctions.
Conclude missing counter FBs.

Leave standard function names hardcoded, as these are considered keywords even though
they may not be implemented in the library.

New version of bistable.txt - due to license issues.

Make semantic error message compatible with beremiz

Merge

Fixes to make handling of standard functions in Semantic analyser compatible with code generation of standard functions

Merge with changes from Mario

Fixing stupid bug (that was disabling code generation).

Adding Makefile for Darwin (thanks go to Manuele)

starting to add proper header file with declaration of standard functions

Fixing error messages for IL semantic errors (brocken in a previous changeset/commit).

Updating license info (with Edouard's permission for relevant files).

Updating License info (with Edoaurd's permission for relevant files).

Adding some debug info

Do not crash when checking semantics of undeclared symbolic_variable.
NOTE: this update may have broken the printing of error messages
during semantic analysis of IL code.

Updating licensing information.

Error messages (stage3) now better identify the location of the error.

Adding debug conditional printf()s in stage 3.
Printing semantic error info to stderr instead of stdout.