source: rtems/cpukit/automake/compile.am @ a953fa1

##
## $Id$
##

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

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

DEFS = @DEFS@

CPPFLAGS = @CPPFLAGS@ $(CPU_DEFINES) $(DEFINES) $(XCPPFLAGS)
CFLAGS   = @RTEMS_CFLAGS@ $(XCFLAGS)
ASFLAGS  = $(CPU_ASFLAGS) $(CPU_CFLAGS) $(XASFLAGS)

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

COMPILE = $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) \
        $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS)
CCLD = $(CC)

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

${ARCH}/%.$(OBJEXT): %.c $(ARCH)/$(dirstamp)
        ${COMPILE} -o $@ -c $<

${ARCH}/%.$(OBJEXT): %.S $(ARCH)/$(dirstamp)
        ${CCASCOMPILE} -o $@ -c $<

# Make foo.rel from foo.$(OBJEXT)
${ARCH}/%.rel: ${ARCH}/%.$(OBJEXT)
        ${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}

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

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

# pull in dependencies if they exist  
ifeq (${DEPEND},$(wildcard ${DEPEND}))
include ${DEPEND}
@ENDIF@
endif
depend: depend-gcc

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

## translate VARIANT into VARIANT_V
VARIANT = OPTIMIZE

VARIANT_OPTIMIZE_V = OPTIMIZE
VARIANT_DEBUG_V = DEBUG
VARIANT_optimize_V = OPTIMIZE
VARIANT_debug_V = DEBUG

VARIANT_V = $(VARIANT_$(VARIANT)_V)

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

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

${ARCH}/$(dirstamp):
        @$(mkdir_p) $(ARCH)
        @: > $(ARCH)/$(dirstamp)

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

LIB_VARIANT = $(LIBSUFFIX_$(VARIANT_V)_V)

## These are supposed to be set in make/custom/<bsp>.cfg
CPU_CFLAGS = @CPU_CFLAGS@
CFLAGS_OPTIMIZE_V = @CFLAGS_OPTIMIZE_V@
CFLAGS_DEBUG_V = @CFLAGS_DEBUG_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 = -Wno-unused

## 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)

## -------------------------------------------------------------------------
AM_CPPFLAGS = $(RTEMS_CPPFLAGS)
AM_CFLAGS =
AM_CCASFLAGS = $(RTEMS_CPPFLAGS) $(RTEMS_ASFLAGS)