The make Environment

The make environment is defined by a file containing variable definitions and rules. This file provides the rules for compiling C, C++, and assembly language. The rules are specific to your compiler - the name of the file indicates the compiler used. For example, when using the gcc compiler, the make environment file is named tgt-make/gcc-devsys.mk. This file contains the variables and rules required for building the component. The following variables are defined:

• CFLAGS and CXXFLAGS specify the compilation options for C and C++ files, respectively. The compilation options are shown in Table 6-1.

  Table 6-1 Compilation Options

  Option	Possible Settings	Default Setting
  WARN	$(WARN_ON), $(WARN_OFF)	$(WARN_ON)
  DEBUG	$(DEBUG_ON), $(DEBUG_OFF)	$(DEBUG_OFF)
  PROF	$(PROF_ON), $(PROF_OFF)	$(PROF_OFF)
  OPT	$(OPT_ON), $(OPT_OFF)	$(OPT_ON)

• INCLUDES and DEFINES specify include and depend values. These variables can be replaced by different variables (overloaded) at the application level. The variables are contained in the CPPFLAGS flag, which is used in compilation and in computing dependencies. Both INCLUDES and DEFINES can be initialized at the application level.

• LD_UCRT0, LD_SCRT0, LD_DCRTO, LD_PSCRT0, LD_PUCRT0, LD_CRTI, and LD_CRTN are used to manage different types of crt object files. A crt object file (crto) contains the entry point of the application (_start or _main).

  Table 6-2 crt Object Files

  LD_UCRT0	Specifies the entry point for an embedded user actor
  LD_SCRT0	Specifies the entry point for an embedded supervisor actor
  LD_DCRT0	Specifies the entry point for drivers
  LD_PSCRT0	Specifies the entry point for a supervisor actor or process
  LD_PUCRT0	Specifies the entry point for a user actor or process
  LD_CRTI	Contains the crti.o file. This file is always the first object file of a link list and should contain the beginning of the .init and .fini sections
  LD_CRTN	Contains the .fini section

• LD_U_ACTOR and LD_S_ACTOR specify link information for user and supervisor actors.

• EBD_U_LIBS, EBD_S_LIBS, CLX_U_LIBS, CLX_S_LIBS, EBD_CXX_LIBS, and CLX_LIBS are provided to manage the libraries for embedded actors, actors and processes.

  Table 6-3 Library Variables

  EBD_U_LIBS	Manages the C library for embedded user actors
  EBD_S_LIBS	Manages the C library for embedded supervisor actors
  CLX_U_LIBS	Manages the C library for user actors and processes
  CLX_S_LIBS	Manages the C library for supervisor actors and processes
  EBD_CXX_LIBS	Manages the C++ library for embedded actors
  CLX_LIBS	Manages the C++ library for actors and processes

The make environment includes the following commands:

• cc

• ld

• as

• mkctors