# -*- mode: makefile-gmake -*-

# If $(PETSC_ARCH) is empty, this defines it and PETSC_DIR
include ./$(PETSC_ARCH)/conf/petscvariables
include ./conf/variables

OBJDIR := $(PETSC_ARCH)/obj
MODDIR := $(PETSC_ARCH)/include
LIBDIR := $(abspath $(PETSC_ARCH)/lib)

pkgs := sys vec mat dm ksp snes ts

libpetsc_shared := $(LIBDIR)/libpetsc.$(SL_LINKER_SUFFIX)
libpetsc_static := $(LIBDIR)/libpetsc.$(AR_LIB_SUFFIX)
libpetscpkgs_shared := $(foreach pkg, $(pkgs), $(LIBDIR)/libpetsc$(pkg).$(SL_LINKER_SUFFIX))
libpetscpkgs_static := $(foreach pkg, $(pkgs), $(LIBDIR)/libpetsc$(pkg).$(AR_LIB_SUFFIX))

ifeq ($(PETSC_WITH_EXTERNAL_LIB),)
  libpetscall_shared := $(libpetscpkgs_shared)
  libpetscall_static := $(libpetscpkgs_static)
else
  libpetscall_shared := $(libpetsc_shared)
  libpetscall_static := $(libpetsc_static)
endif
libpetscall := $(if $(filter-out no,$(BUILDSHAREDLIB)),$(libpetscall_shared),$(libpetscall_static))

generated := $(PETSC_ARCH)/conf/files

all : $(generated) $(libpetscall)

.SECONDEXPANSION:		# to expand $$(@D)/.DIR

#workarround old cygwin versions
ifeq ($(PETSC_CYGWIN_BROKEN_PIPE),1)
ifeq ($(shell basename $(AR)),ar)
  V ?=1
endif
endif
ifeq ($(V),)
  quiet_HELP := "Use \"$(MAKE) V=1\" to see the verbose compile lines.\n"
  quiet = @printf $(quiet_HELP)$(eval quiet_HELP:=)"  %10s %s\n" "$1$2" "$@"; $($1)
else ifeq ($(V),0)		# Same, but do not print any help
  quiet = @printf "  %10s %s\n" "$1$2" "$@"; $($1)
else				# Show the full command line
  quiet = $($1)
endif

$(PETSC_ARCH)/conf/files :
	$(PYTHON) conf/gmakegen.py --petsc-arch=$(PETSC_ARCH)

-include $(generated)

ifeq ($(PETSC_LANGUAGE),CXXONLY)
  cc_name := CXX
else
  cc_name := CC
endif

PETSC_COMPILE.c = $(call quiet,$(cc_name)) -c $(PCC_FLAGS) $(CFLAGS) $(CCPPFLAGS) $(C_DEPFLAGS)
PETSC_COMPILE.cxx = $(call quiet,CXX) -c $(PCC_FLAGS) $(CFLAGS) $(CCPPFLAGS) $(CXX_DEPFLAGS)
PETSC_COMPILE.cu = $(call quiet,CUDAC) -c $(CUDAC_FLAGS) --compiler-options="$(PCC_FLAGS) $(CXXFLAGS) $(CCPPFLAGS)"
PETSC_GENDEPS.cu = $(call quiet,CUDAC,.dep) --generate-dependencies $(CUDAC_FLAGS) --compiler-options="$(PCC_FLAGS) $(CXXFLAGS) $(CCPPFLAGS)"
PETSC_COMPILE.F = $(call quiet,FC) -c $(FC_FLAGS) $(FFLAGS) $(FCPPFLAGS) $(FC_DEPFLAGS)

langs := c cu cxx F
concatlang = $(foreach lang, $(langs), $(srcs-$(1).$(lang):%.$(lang)=$(OBJDIR)/%.o))
srcs.o := $(foreach pkg, $(pkgs), $(call concatlang,$(pkg)))

# with-single-library=1 (default)
$(libpetsc_shared) : $(srcs.o) | $$(@D)/.DIR
	$(call quiet,CLINKER) -shared -o $@ $^ $(PETSC_EXTERNAL_LIB_BASIC)
ifneq ($(DSYMUTIL),true)
	$(call quiet,DSYMUTIL) $@
endif

$(libpetsc_static) : obj := $(srcs.o)

define ARCHIVE_RECIPE_WIN32FE_LIB
  @$(RM) $@ $@.args
  @cygpath -w $^ > $@.args
  $(call quiet,AR) $(AR_FLAGS) $@ @$@.args
  @$(RM) $@.args
endef

define ARCHIVE_RECIPE_DEFAULT
  @$(RM) $@
  $(call quiet,AR) $(AR_FLAGS) $@ $^
  $(call quiet,RANLIB) $@
endef

%.$(AR_LIB_SUFFIX) : $$(obj) | $$(@D)/.DIR
	$(if $(findstring win32fe lib,$(AR)),$(ARCHIVE_RECIPE_WIN32FE_LIB),$(ARCHIVE_RECIPE_DEFAULT))

# with-single-library=0
libpkg = $(foreach pkg, $1, $(LIBDIR)/libpetsc$(pkg).$(SL_LINKER_SUFFIX))
$(LIBDIR)/libpetscsys.$(SL_LINKER_SUFFIX)  : obj    := $(call concatlang,sys)
$(LIBDIR)/libpetscvec.$(SL_LINKER_SUFFIX)  : obj    := $(call concatlang,vec)
$(LIBDIR)/libpetscvec.$(SL_LINKER_SUFFIX)  : libdep := $(call libpkg,sys)
$(LIBDIR)/libpetscmat.$(SL_LINKER_SUFFIX)  : obj    := $(call concatlang,mat)
$(LIBDIR)/libpetscmat.$(SL_LINKER_SUFFIX)  : libdep := $(call libpkg,vec sys)
$(LIBDIR)/libpetscdm.$(SL_LINKER_SUFFIX)   : obj    := $(call concatlang,dm)
$(LIBDIR)/libpetscdm.$(SL_LINKER_SUFFIX)   : libdep := $(call libpkg,mat vec sys)
$(LIBDIR)/libpetscksp.$(SL_LINKER_SUFFIX)  : obj    := $(call concatlang,ksp)
$(LIBDIR)/libpetscksp.$(SL_LINKER_SUFFIX)  : libdep := $(call libpkg,dm mat vec sys)
$(LIBDIR)/libpetscsnes.$(SL_LINKER_SUFFIX) : obj    := $(call concatlang,snes)
$(LIBDIR)/libpetscsnes.$(SL_LINKER_SUFFIX) : libdep := $(call libpkg,ksp dm mat vec sys)
$(LIBDIR)/libpetscts.$(SL_LINKER_SUFFIX)   : obj    := $(call concatlang,ts)
$(LIBDIR)/libpetscts.$(SL_LINKER_SUFFIX)   : libdep := $(call libpkg,snes ksp dm mat vec sys)
$(LIBDIR)/libpetscsys.$(AR_LIB_SUFFIX)  : $(call concatlang,sys)
$(LIBDIR)/libpetscvec.$(AR_LIB_SUFFIX)  : $(call concatlang,vec)
$(LIBDIR)/libpetscmat.$(AR_LIB_SUFFIX)  : $(call concatlang,mat)
$(LIBDIR)/libpetscdm.$(AR_LIB_SUFFIX)   : $(call concatlang,dm)
$(LIBDIR)/libpetscksp.$(AR_LIB_SUFFIX)  : $(call concatlang,ksp)
$(LIBDIR)/libpetscsnes.$(AR_LIB_SUFFIX) : $(call concatlang,snes)
$(LIBDIR)/libpetscts.$(AR_LIB_SUFFIX)   : $(call concatlang,ts)

# The package libraries technically depend on each other (not just in an order-only way), but only
# ABI changes like new or removed symbols requires relinking the dependent libraries.  ABI should
# only occur when a header is changed, which would trigger recompilation and relinking anyway.
# RELINK=1 causes dependent libraries to be relinked anyway.
ifeq ($(RELINK),1)
  libdep_true = $$(libdep)
  libdep_order =
else
  libdep_true =
  libdep_order = $$(libdep)
endif
$(libpetscpkgs_shared) : $$(obj) $(libdep_true) | $(libdep_order) $$(@D)/.DIR
	$(call quiet,CLINKER) -shared -o $@ $(obj) $(libdep) $(PETSC_EXTERNAL_LIB_BASIC)
ifneq ($(DSYMUTIL),true)
	$(call quiet,DSYMUTIL) $@
endif

$(OBJDIR)/%.o : %.c | $$(@D)/.DIR
	$(PETSC_COMPILE.c) $(abspath $<) -o $@

$(OBJDIR)/%.o : %.cxx | $$(@D)/.DIR
	$(PETSC_COMPILE.cxx) $(abspath $<) -o $@

$(OBJDIR)/%.o : %.cu | $$(@D)/.DIR
	$(PETSC_COMPILE.cu) $(abspath $<) -o $@ # Compile first so that if there is an error, it comes from a normal compile
	@$(PETSC_GENDEPS.cu) $(abspath $<) -o $(@:%.o=%.d) # Generate the dependencies for later

$(OBJDIR)/%.o : %.F | $$(@D)/.DIR
ifeq ($(FC_MODULE_OUTPUT_FLAG),)
	cd $(MODDIR) && $(FC) -c $(FC_FLAGS) $(FFLAGS) $(FCPPFLAGS) $(FC_DEPFLAGS) $(abspath $<) -o $(abspath $@)
else
	$(PETSC_COMPILE.F) $(abspath $<) -o $@ $(FC_MODULE_OUTPUT_FLAG)$(MODDIR)
endif

# Hack: manual dependencies on object files
ifeq ($(MPI_IS_MPIUNI),1)
  MPIUNI_MOD := $(MODDIR)/mpi.mod
endif
$(OBJDIR)/src/sys/f90-mod/petscsysmod.o   : $(if $(MPIUNI_MOD),$(OBJDIR)/src/sys/mpiuni/f90-mod/mpiunimod.o)
$(OBJDIR)/src/vec/f90-mod/petscvecmod.o   : $(OBJDIR)/src/sys/f90-mod/petscsysmod.o
$(OBJDIR)/src/mat/f90-mod/petscmatmod.o   : $(OBJDIR)/src/vec/f90-mod/petscvecmod.o
$(OBJDIR)/src/dm/f90-mod/petscdmmod.o     : $(OBJDIR)/src/mat/f90-mod/petscmatmod.o
$(OBJDIR)/src/ksp/f90-mod/petsckspmod.o   : $(OBJDIR)/src/dm/f90-mod/petscdmmod.o
$(OBJDIR)/src/snes/f90-mod/petscsnesmod.o : $(OBJDIR)/src/ksp/f90-mod/petsckspmod.o
$(OBJDIR)/src/ts/f90-mod/petsctsmod.o     : $(OBJDIR)/src/snes/f90-mod/petscsnesmod.o

%/.DIR :
	@mkdir -p $(@D)
	@touch $@

.PRECIOUS: %/.DIR

.SUFFIXES: # Clear .SUFFIXES because we don't use implicit rules
.DELETE_ON_ERROR:               # Delete likely-corrupt target file if rule fails

.PHONY: clean all print

clean:
	rm -rf $(OBJDIR) $(LIBDIR)/libpetsc* $(MODDIR)/petsc*.mod $(MPIUNI_MOD) $(generated)

# make print VAR=the-variable
print:
	@echo $($(VAR))

allobj.d := $(srcs.o:%.o=%.d)
# Tell make that allobj.d are all up to date.  Without this, the include
# below has quadratic complexity, taking more than one second for a
# do-nothing build of PETSc (much worse for larger projects)
$(allobj.d) : ;

-include $(allobj.d)