source: rtems/c/src/exec/automake/compile.am @ 6ba9c27

##
## $Id$
##

## -------------------------------------------------------------------------
## NOTE: This file is rather immature and has to be considered to be 
## almost experimental.
##
## Expect frequent changes -- It deserves to be cleaned up :(
## -------------------------------------------------------------------------

## The section below is based on make/compilers/gcc-target-default.cfg
## used in former versions of RTEMS.

## 
## Set up the flags for the toolchains:
##
## We are considering 3 different building schemes here:
## * Using gcc's being able to accept -specs (aka gcc-2.8 building scheme)
## * Using gcc's not being able to accept -specs (aka gcc-2.7.2 building
##   scheme)
## * Using third party toolchains (aka non-gcc building scheme)
##
## Automake conditionals in use:
## RTEMS_USE_GCC     .. if we are using GCC

## NOTES: 
## * The gcc-2.8 building scheme is the nominal building scheme and
##   is actively supported.
## * The non-gcc building scheme requires manually setting up environment 
##   variables and is hardly tested at all

## CFLAGS_OPTIMIZE_V, CFLAGS_DEBUG_V, CFLAGS_PROFILE_V are the values we
## would want the corresponding macros to be set to.
##
## CFLAGS_OPTIMIZE, CFLAGS_DEBUG, CFLAGS_PROFILE are set by the 
## 'VARIANT=<OPTIMIZE|DEBUG|PROFILE>' targets to their _V values.

## XCPPFLAGS, XCFLAGS, XASFLAGS 
## are used to add flags from the shell
## cf. make.info ("Implicit rules/variables" for details)

if RTEMS_USE_GCC
## All the stuff below is specific to gcc

CFLAGS_DEFAULT=-g -Wall
## gcc >= 2.8.x
GCCSPECS = $(GCC_SPECS) $(RTEMS_BSP_SPECS)
else
## fall back to the old style compilers/*.cfg
## CONFIG.CC is supposed to be provided by <BSP>.cfg
include $(CONFIG.CC)
endif # RTEMS_USE_GCC

DEFS = @DEFS@

CPPFLAGS = @CPPFLAGS@ $(CPU_DEFINES) \
   $(DEFINES) $(XCPPFLAGS) $(CPPFLAGS_GCC)
CFLAGS   = $(CFLAGS_DEFAULT) $(CPU_CFLAGS) $(XCFLAGS)
ASFLAGS  = $(CPU_ASFLAGS) $(CPU_CFLAGS) $(XASFLAGS)

## FIXME: This doesn't seem to be correct
# when debugging, optimize flag: typically empty
# some compilers do allow optimization with their "-g"
CFLAGS_DEBUG_OPTIMIZE_V=-g
LDFLAGS_DEBUG_V =

# profile flag; use gprof(1)
CFLAGS_PROFILE_V=-pg
LDFLAGS_PROFILE_V =

# List of library paths without -L
LD_PATHS= $(PROJECT_RELEASE)/lib

# ld flag for incomplete link
LDFLAGS_INCOMPLETE = -r

# ld flags for profiling, debugging
LDFLAGS=$(LDFLAGS_PROFILE) $(LDFLAGS_DEBUG) $(LD_PATHS:%=-L %)

#
# How to compile stuff into ${ARCH} subdirectory
#

COMPILE = $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) \
        $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS)
CCLD = $(CC)
LINK = $(CCLD) $(AM_CFLAGS) $(CFLAGS) \
        $(AM_LDFLAGS) $(LDFLAGS) -o $@

CCASCOMPILE = $(CCAS) $(AM_CCASFLAGS) $(CCASFLAGS)

${ARCH}/%.o: %.c
        ${COMPILE} -o $@ -c $<

${ARCH}/%.o: %.S
        ${CCASCOMPILE} -o $@ -c $<

# Make foo.rel from foo.o
${ARCH}/%.rel: ${ARCH}/%.o
        ${make-rel}

# Dependency files for use by gmake
# NOTE: we don't put them into $(ARCH)
#       so that 'make clean' doesn't blow it away

DEPEND=Depends-${ARCH}

CLEAN_DEPEND=$(DEPEND).tmp
CLOBBER_DEPEND=$(DEPEND)

# We deliberately don't have anything depend on the
# $(DEPEND) file; otherwise it will get rebuilt even
# on 'make clean'
#

## HACK: Specific to gcc
## FIXME: The approach below is known to be conceptionally broken.
depend-am: $(C_FILES) $(CC_FILES) $(S_FILES)
##       Use gcc -M to generate dependencies
##       Replace foo.o with $(ARCH)/foo.o
##       Replace $(ARCH) value with string $(ARCH)
##           so that it will for debug and profile cases
        $(COMPILE) -M   $^    |  \
        sed -e 's?^\(.*\)\.o[ ]*:?$$(ARCH)/\1.o:?' \
            -e 's?$(ARCH)/?$$(ARCH)/?'   >$(DEPEND).tmp
        mv $(DEPEND).tmp $(DEPEND)
depend: depend-am

# pull in dependencies if they exist  
ifeq (${DEPEND},$(wildcard ${DEPEND}))
include ${DEPEND}
@ENDIF@

if RTEMS_USE_GCC
## gcc >= 2.8
define make-rel
        $(LINK) -qnolinkcmds -nostdlib -Wl,-r $(XLDFLAGS) $^
endef
else
## non-gcc
define make-rel
        $(LINK) $(XLDFLAGS) $^
endef
endif

## -------------------------------------------------------------------------

## translate VARIANT into VARIANT_V
VARIANT = OPTIMIZE

VARIANT_OPTIMIZE_V = OPTIMIZE
VARIANT_DEBUG_V = DEBUG
VARIANT_PROFILE_V = PROFILE
VARIANT_optimize_V = OPTIMIZE
VARIANT_debug_V = DEBUG
VARIANT_profile_V = PROFILE

VARIANT_V = $(VARIANT_$(VARIANT)_V)

## Setup the variant build subdirectory
ARCH_OPTIMIZE_V = o-optimize
ARCH_DEBUG_V = o-debug
ARCH_PROFILE_V = o-profile

ARCH__V = $(ARCH_OPTIMIZE_V)
ARCH = $(ARCH_$(VARIANT_V)_V)

## Setup the library suffix
LIBSUFFIX_OPTIMIZE_V =
LIBSUFFIX_DEBUG_V = _g
LIBSUFFIX_PROFILE_V = _p
LIBSUFFIX__V = $(LIBSUFFIX_OPTIMIZE_V)

LIB_VARIANT = $(LIBSUFFIX_$(VARIANT_V)_V)
LIBSUFFIX_VA = $(LIB_VARIANT).a

## These are supposed to be set in make/custom/<bsp>.cfg
## CFLAGS_OPTIMIZE_V = 
## CFLAGS_DEBUG_V =
## CFLAGS_PROFILE_V =
CFLAGS__V = $(CFLAGS_OPTIMIZE_V)

## ------------------------------------------------------------------------
## Setup hard-coded flags
if RTEMS_USE_GCC
## gcc >= gcc-2.8
RTEMS_CFLAGS_OPTIMIZE_V =
RTEMS_CFLAGS_DEBUG_V = -qrtems_debug -Wno-unused
RTEMS_CFLAGS_PROFILE_V =

## non-gcc
## We can't guess what flags might be required here.
## Pass the values from the environment if you want to apply them.
endif
RTEMS_CFLAGS__V = $(RTEMS_CFLAGS_OPTIMIZE_V)

## -------------------------------------------------------------------------

CC = @CC@ $(GCCSPECS)
CPP = @CPP@ $(GCCSPECS)

##
AM_CPPFLAGS = $(RTEMS_CPPFLAGS)

AM_CFLAGS = $(RTEMS_CFLAGS_$(VARIANT_V)_V) $(CFLAGS_$(VARIANT_V)_V)

# AM_CFLAGS = $(RTEMS_BSP_CFLAGS) $(RTEMS_CFLAGS)
AM_CCASFLAGS = $(RTEMS_BSP_CFLAGS) $(RTEMS_CPPFLAGS) $(RTEMS_ASFLAGS)