xref: /petsc/gmakefile (revision f16d4c0b3d5a8184833c3200057fe2aa5fc8318e)
1b20fdbb7SJed Brown# -*- mode: makefile-gmake -*-
20e03b746SBarry Smithinclude petscdir.mk
3b20fdbb7SJed Brown
4c56ed359SJed Brown# If $(PETSC_ARCH) is empty, this defines it and PETSC_DIR
5af0996ceSBarry Smithinclude ./$(PETSC_ARCH)/lib/petsc/conf/petscvariables
6af0996ceSBarry Smithinclude ./lib/petsc/conf/variables
7b20fdbb7SJed Brown
8bd8575cfSJed BrownOBJDIR := $(PETSC_ARCH)/obj
98e69c5ecSJed BrownLIBDIR := $(PETSC_ARCH)/lib
10b20fdbb7SJed Brown
11db1d44c2SSatish Balaypkgs := sys vec mat dm ksp snes ts tao
12f319b297SJed Brown
13cbb9ddc4SJed Brown# $(call SONAME_FUNCTION,libfoo,abiversion)
14cbb9ddc4SJed BrownSONAME_FUNCTION ?= $(1).$(SL_LINKER_SUFFIX).$(2)
15cbb9ddc4SJed Brown# $(call SL_LINKER_FUNCTION,libfoo,abiversion,libversion)
1630a89febSJed BrownSL_LINKER_FUNCTION ?= -shared -Wl,-soname,$(call SONAME_FUNCTION,$(notdir $(1)),$(2))
171dabf717SJed Brown
18ca515531SSatish BalayPETSC_VERSION_MAJOR := $(shell awk '/define PETSC_VERSION_MAJOR/{print $$3;}' ./include/petscversion.h)
19ca515531SSatish BalayPETSC_VERSION_MINOR := $(shell awk '/define PETSC_VERSION_MINOR/{print $$3;}' ./include/petscversion.h)
20ca515531SSatish BalayPETSC_VERSION_SUBMINOR := $(shell awk '/define PETSC_VERSION_SUBMINOR/{print $$3;}' ./include/petscversion.h)
21ca515531SSatish BalayPETSC_VERSION_RELEASE := $(shell awk '/define PETSC_VERSION_RELEASE/{print $$3;}' ./include/petscversion.h)
22cbb9ddc4SJed Brown
238ee20ad2SSatish Balaylibpetsc_abi_version := $(PETSC_VERSION_MAJOR).$(if $(filter $(PETSC_VERSION_RELEASE), 0 -2 -3 -4 -5),0)$(PETSC_VERSION_MINOR)
24cbb9ddc4SJed Brownlibpetsc_lib_version := $(libpetsc_abi_version).$(PETSC_VERSION_SUBMINOR)
25cbb9ddc4SJed Brownsoname_function = $(call SONAME_FUNCTION,$(1),$(libpetsc_abi_version))
26cbb9ddc4SJed Brownlibname_function = $(call SONAME_FUNCTION,$(1),$(libpetsc_lib_version))
27436e4224SJed Brownabsbasename_all = $(basename $(basename $(basename $(basename $(abspath $(1))))))# arch/lib/libpetsc.so.3.8.0 -> /path/to/arch/lib/libpetsc
28436e4224SJed Brownsl_linker_args = $(call SL_LINKER_FUNCTION,$(call absbasename_all,$@),$(libpetsc_abi_version),$(libpetsc_lib_version))
29cbb9ddc4SJed Brown
30bdb7955eSJed Brownlibpetsc_shared  := $(LIBDIR)/libpetsc.$(SL_LINKER_SUFFIX)
31cbb9ddc4SJed Brownlibpetsc_soname  := $(call soname_function,$(LIBDIR)/libpetsc)
32cbb9ddc4SJed Brownlibpetsc_libname := $(call libname_function,$(LIBDIR)/libpetsc)
334f578dfeSJed Brownlibpetsc_static  := $(LIBDIR)/libpetsc.$(AR_LIB_SUFFIX)
34bdb7955eSJed Brownlibpetscpkgs_shared  := $(foreach pkg, $(pkgs), $(LIBDIR)/libpetsc$(pkg).$(SL_LINKER_SUFFIX))
35cbb9ddc4SJed Brownlibpetscpkgs_soname  := $(foreach pkg, $(pkgs), $(call soname_function,$(LIBDIR)/libpetsc$(pkg)))
36cbb9ddc4SJed Brownlibpetscpkgs_libname := $(foreach pkg, $(pkgs), $(call libname_function,$(LIBDIR)/libpetsc$(pkg)))
374f578dfeSJed Brownlibpetscpkgs_static  := $(foreach pkg, $(pkgs), $(LIBDIR)/libpetsc$(pkg).$(AR_LIB_SUFFIX))
38f319b297SJed Brown
39f319b297SJed Brownifeq ($(PETSC_WITH_EXTERNAL_LIB),)
40f319b297SJed Brown  libpetscall_shared  := $(libpetscpkgs_shared)
41cbb9ddc4SJed Brown  libpetscall_soname  := $(libpetscpkgs_soname)
42cbb9ddc4SJed Brown  libpetscall_libname := $(libpetscpkgs_libname)
434f578dfeSJed Brown  libpetscall_static  := $(libpetscpkgs_static)
44f319b297SJed Brownelse
45f319b297SJed Brown  libpetscall_shared  := $(libpetsc_shared)
46cbb9ddc4SJed Brown  libpetscall_soname  := $(libpetsc_soname)
47cbb9ddc4SJed Brown  libpetscall_libname := $(libpetsc_libname)
484f578dfeSJed Brown  libpetscall_static  := $(libpetsc_static)
49f319b297SJed Brownendif
50d058db48SJed Brownlibpetscall := $(if $(filter-out no,$(BUILDSHAREDLIB)),$(libpetscall_shared),$(libpetscall_static))
51f319b297SJed Brown
52af0996ceSBarry Smithgenerated      := $(PETSC_ARCH)/lib/petsc/conf/files
53fec79bb3SJed Brown
540e03b746SBarry Smithlibs : $(libpetscall)
550e03b746SBarry Smith.PHONY: libs
56b20fdbb7SJed Brown
57b20fdbb7SJed Brown.SECONDEXPANSION:		# to expand $$(@D)/.DIR
58b20fdbb7SJed Brown
593e5c5acdSJed Brown# Test framework includes rules and variables relevant to both build and test
603e5c5acdSJed Browninclude ./gmakefile.test        # This must be below the all target because it includes rules
613e5c5acdSJed Brown
62b181ea86SSatish Balay$(generated) : $(petscconf) $(petscvariables) config/gmakegen.py
630ee81e68SLisandro Dalcin	$(PYTHON) ./config/gmakegen.py --petsc-arch=$(PETSC_ARCH)
64b20fdbb7SJed Brown
65535b694aSJed Brown# Skip including generated files (which triggers rebuilding them) when we're just going to clean anyway.
664f08eaf7SJed Brownifneq ($(filter-out clean check info,$(MAKECMDGOALS:clean%=clean)),)
67336d78f1SSatish Balayinclude $(generated)
68535b694aSJed Brownendif
69b20fdbb7SJed Brown
701b8cab44SSatish Balay# implies shared libraries with MS compilers
71aa11c055SSatish Balayifeq ($(PETSC_DLL_EXPORTS),1)
72d6f00007SSatish Balay$(OBJDIR)/%.o : CCPPFLAGS+=-Dpetsc_EXPORTS
73aa11c055SSatish Balay$(OBJDIR)/%.o : CXXCPPFLAGS+=-Dpetsc_EXPORTS
740d8a85bbSJunchao Zhang$(OBJDIR)/%.o : CUDACPPFLAGS+=-Dpetsc_EXPORTS
751b8cab44SSatish Balayendif
761b8cab44SSatish Balay
779ca017bdSStefano Zampinilangs := F F90 cxx c
7828f796eaSScott Krugerifneq ($(CUDAC),)
7928f796eaSScott Krugerlangs += cu
809ca017bdSStefano Zampiniendif
81694a2f0eSJunchao Zhangifneq ($(HIPC),)
8228f796eaSScott Krugerlangs += hip.cpp
8328f796eaSScott Krugerendif
8450dcbc5aSJunchao Zhangifneq ($(SYCLC),)
8528f796eaSScott Krugerlangs += sycl.cxx
8628f796eaSScott Krugerendif
87c0558f20SBarry Smithifneq ($(KOKKOS_LIB),)
88c0558f20SBarry Smithlangs += kokkos.cxx
89c0558f20SBarry Smithendif
9028f796eaSScott Kruger
9194666443SJed Brownconcatlang = $(foreach lang, $(langs), $(srcs-$(1).$(lang):src/%.$(lang)=$(OBJDIR)/%.o))
92befe2181SJed Brownsrcs.o := $(foreach pkg, $(pkgs), $(call concatlang,$(pkg)))
93f22bedf1SBarry Smithconcatlangsrc = $(foreach lang, $(langs), $(srcs-$(1).$(lang)))
94f22bedf1SBarry Smithcsrc := $(foreach pkg, $(pkgs),  $(srcs-$(pkg).c))
95f22bedf1SBarry Smithshowcsrc:
96f22bedf1SBarry Smith	-@echo $(csrc)
97b20fdbb7SJed Brown
981b8cab44SSatish Balaydefine SHARED_RECIPE_DLL
991b8cab44SSatish Balay  @$(RM) $@ dllcmd.${PETSC_ARCH}
1001b8cab44SSatish Balay  @cygpath -w $^ > dllcmd.${PETSC_ARCH}
1011b8cab44SSatish Balay  $(call quiet,CLINKER) $(sl_linker_args) -o $@ @dllcmd.${PETSC_ARCH} $(PETSC_EXTERNAL_LIB_BASIC)
1021b8cab44SSatish Balay  @$(RM) dllcmd.${PETSC_ARCH}
1031b8cab44SSatish Balayendef
1041b8cab44SSatish Balay
105*f16d4c0bSSatish Balaydefine SHARED_RECIPE_ATFILE
106*f16d4c0bSSatish Balay  $(file > $@.args,$^)
107*f16d4c0bSSatish Balay  $(call quiet,CLINKER) $(sl_linker_args) -o $@ @$@.args $(PETSC_EXTERNAL_LIB_BASIC)
108*f16d4c0bSSatish Balay  @$(RM) $@.args
109*f16d4c0bSSatish Balayendef
110*f16d4c0bSSatish Balay
1111b8cab44SSatish Balaydefine SHARED_RECIPE_DEFAULT
1121b8cab44SSatish Balay  $(call quiet,CLINKER) $(sl_linker_args) -o $@ $^ $(PETSC_EXTERNAL_LIB_BASIC)
1131b8cab44SSatish Balayendef
1141b8cab44SSatish Balay
115*f16d4c0bSSatish BalayGMAKE4 = $(if $(findstring 3.99,$(firstword $(sort 3.99 $(MAKE_VERSION)))),1,)
116*f16d4c0bSSatish BalaySHARED_RECIPE = $(if $(findstring -LD,$(SL_LINKER_FUNCTION)),$(SHARED_RECIPE_DLL),$(if $(PCC_AT_FILE),$(if $(GMAKE4),$(SHARED_RECIPE_ATFILE),$(SHARED_RECIPE_DEFAULT)),$(SHARED_RECIPE_DEFAULT)))
11768276145SJed Brown
118f319b297SJed Brown# with-single-library=1 (default)
119cbb9ddc4SJed Brown$(libpetsc_libname) : $(srcs.o) | $$(@D)/.DIR
12068276145SJed Brown	$(SHARED_RECIPE)
1211cc4adfcSLisandro Dalcinifneq ($(DSYMUTIL),true)
1221cc4adfcSLisandro Dalcin	$(call quiet,DSYMUTIL) $@
1231cc4adfcSLisandro Dalcinendif
124f319b297SJed Brown
125befe2181SJed Brown$(libpetsc_static) : obj := $(srcs.o)
1264f578dfeSJed Brown
127c97397e8SSatish Balaydefine ARCHIVE_RECIPE_WIN32FE_LIB
128c97397e8SSatish Balay  @$(RM) $@ $@.args
129c97397e8SSatish Balay  @cygpath -w $^ > $@.args
130c97397e8SSatish Balay  $(call quiet,AR) $(AR_FLAGS) $@ @$@.args
131c97397e8SSatish Balay  @$(RM) $@.args
132c97397e8SSatish Balayendef
133c97397e8SSatish Balay
13454c11a94SPierre Jolivetdefine ARCHIVE_RECIPE_ARGFILE
13554c11a94SPierre Jolivet  @$(RM) $@
13654c11a94SPierre Jolivet  $(file > $@.args,$^)
13754c11a94SPierre Jolivet  $(call quiet,AR) $(AR_FLAGS) $@ @$@.args
13854c11a94SPierre Jolivet  @$(RM) $@.args
13954c11a94SPierre Jolivet  $(call quiet,RANLIB) $@
14054c11a94SPierre Jolivetendef
14154c11a94SPierre Jolivet
142c97397e8SSatish Balaydefine ARCHIVE_RECIPE_DEFAULT
1434f578dfeSJed Brown  @$(RM) $@
1444f578dfeSJed Brown  $(call quiet,AR) $(AR_FLAGS) $@ $^
1454f578dfeSJed Brown  $(call quiet,RANLIB) $@
146c97397e8SSatish Balayendef
147c97397e8SSatish Balay
148c97397e8SSatish Balay%.$(AR_LIB_SUFFIX) : $$(obj) | $$(@D)/.DIR
149*f16d4c0bSSatish Balay	$(if $(findstring win32fe lib,$(AR)),$(ARCHIVE_RECIPE_WIN32FE_LIB),$(if $(findstring yes,$(AR_ARGFILE)),$(if $(GMAKE4),$(ARCHIVE_RECIPE_ARGFILE),$(ARCHIVE_RECIPE_DEFAULT)),$(ARCHIVE_RECIPE_DEFAULT)))
1504f578dfeSJed Brown
151f319b297SJed Brown# with-single-library=0
152bdb7955eSJed Brownlibpkg = $(foreach pkg, $1, $(LIBDIR)/libpetsc$(pkg).$(SL_LINKER_SUFFIX))
153238b8c32SJed Browndefine pkg_template
154cbb9ddc4SJed Brown  $(LIBDIR)/libpetsc$(1).$(AR_LIB_SUFFIX)  : $(call concatlang,$(1))
1559fad5983SJed Brown  $(call libname_function,$(LIBDIR)/libpetsc$(1)) : $(call concatlang,$(1))
156cbb9ddc4SJed Brownendef
157cbb9ddc4SJed Brown$(foreach pkg,$(pkgs),$(eval $(call pkg_template,$(pkg))))
158cbb9ddc4SJed Brown$(call libname_function,$(LIBDIR)/libpetscvec)  : libdep := $(call libpkg,sys)
159cbb9ddc4SJed Brown$(call libname_function,$(LIBDIR)/libpetscmat)  : libdep := $(call libpkg,vec sys)
160cbb9ddc4SJed Brown$(call libname_function,$(LIBDIR)/libpetscdm)   : libdep := $(call libpkg,mat vec sys)
161cbb9ddc4SJed Brown$(call libname_function,$(LIBDIR)/libpetscksp)  : libdep := $(call libpkg,dm mat vec sys)
162cbb9ddc4SJed Brown$(call libname_function,$(LIBDIR)/libpetscsnes) : libdep := $(call libpkg,ksp dm mat vec sys)
163cbb9ddc4SJed Brown$(call libname_function,$(LIBDIR)/libpetscts)   : libdep := $(call libpkg,snes ksp dm mat vec sys)
164943bb183SJed Brown$(call libname_function,$(LIBDIR)/libpetsctao)  : libdep := $(call libpkg,snes ksp dm mat vec sys)
165f319b297SJed Brown
166b63d434aSJed Brown# The package libraries technically depend on each other (not just in an order-only way), but only
167b63d434aSJed Brown# ABI changes like new or removed symbols requires relinking the dependent libraries.  ABI should
168b63d434aSJed Brown# only occur when a header is changed, which would trigger recompilation and relinking anyway.
169b63d434aSJed Brown# RELINK=1 causes dependent libraries to be relinked anyway.
170b63d434aSJed Brownifeq ($(RELINK),1)
171b63d434aSJed Brown  libdep_true = $$(libdep)
172b63d434aSJed Brown  libdep_order =
173b63d434aSJed Brownelse
174b63d434aSJed Brown  libdep_true =
175b63d434aSJed Brown  libdep_order = $$(libdep)
176b63d434aSJed Brownendif
1779fad5983SJed Brown$(libpetscpkgs_libname) : $(libdep_true) | $(libdep_order) $$(@D)/.DIR
17868276145SJed Brown	$(SHARED_RECIPE)
1791cc4adfcSLisandro Dalcinifneq ($(DSYMUTIL),true)
1801cc4adfcSLisandro Dalcin	$(call quiet,DSYMUTIL) $@
1811cc4adfcSLisandro Dalcinendif
182b20fdbb7SJed Brown
1831d839746SSatish Balay%.$(SL_LINKER_SUFFIX) : $(call libname_function,%) | $(call soname_function,%)
184b031592aSJed Brown	@ln -sf $(notdir $<) $@
185cbb9ddc4SJed Brown
186cbb9ddc4SJed Brown$(call soname_function,%) : $(call libname_function,%)
187b031592aSJed Brown	@ln -sf $(notdir $<) $@
188cbb9ddc4SJed Brown
1891d839746SSatish Balay.PRECIOUS: $(call soname_function,%)
1901d839746SSatish Balay
19150dcbc5aSJunchao Zhang$(OBJDIR)/%.o : src/%.sycl.cxx | $$(@D)/.DIR
19250dcbc5aSJunchao Zhang	$(PETSC_COMPILE.sycl.cxx) $(abspath $<) -o $@
19350dcbc5aSJunchao Zhang
19494666443SJed Brown$(OBJDIR)/%.o : src/%.c | $$(@D)/.DIR
19542ba19e2SJed Brown	$(PETSC_COMPILE.c) $(abspath $<) -o $@
196b20fdbb7SJed Brown
197c0558f20SBarry Smith$(OBJDIR)/%.o : src/%.kokkos.cxx | $$(@D)/.DIR
198c0558f20SBarry Smith	$(PETSC_COMPILE.kokkos.cxx) $(abspath $<) -o $@
199c0558f20SBarry Smith
20094666443SJed Brown$(OBJDIR)/%.o : src/%.cxx | $$(@D)/.DIR
20142ba19e2SJed Brown	$(PETSC_COMPILE.cxx) $(abspath $<) -o $@
202b20fdbb7SJed Brown
20328f796eaSScott Kruger$(OBJDIR)/%.o : src/%.hip.cpp | $$(@D)/.DIR
20428f796eaSScott Kruger	$(PETSC_COMPILE.hip.cpp) $(abspath $<) -o $@
20528f796eaSScott Kruger
20694666443SJed Brown$(OBJDIR)/%.o : src/%.cu | $$(@D)/.DIR
20742ba19e2SJed Brown	$(PETSC_COMPILE.cu) $(abspath $<) -o $@ # Compile first so that if there is an error, it comes from a normal compile
20842ba19e2SJed Brown	@$(PETSC_GENDEPS.cu) $(abspath $<) -o $(@:%.o=%.d) # Generate the dependencies for later
209b20fdbb7SJed Brown
2103196a6e9SSatish BalayFCMOD = cd
21194666443SJed Brown$(OBJDIR)/%.o : src/%.F | $$(@D)/.DIR
2124bd75098SSatish Balayifeq ($(FC_MODULE_OUTPUT_FLAG),)
2133196a6e9SSatish Balay	$(call quiet,FCMOD) $(MODDIR) && $(FC) -c $(FC_FLAGS) $(FFLAGS) $(FCPPFLAGS) $(FC_DEPFLAGS) $(abspath $<) -o $(abspath $@)
2144bd75098SSatish Balayelse
21542ba19e2SJed Brown	$(PETSC_COMPILE.F) $(abspath $<) -o $@ $(FC_MODULE_OUTPUT_FLAG)$(MODDIR)
2164bd75098SSatish Balayendif
2170266c241SJed Brown	-@$(GFORTRAN_DEP_CLEANUP)
218b20fdbb7SJed Brown
21994666443SJed Brown$(OBJDIR)/%.o : src/%.F90 | $$(@D)/.DIR
22029921a8fSScott Krugerifeq ($(FC_MODULE_OUTPUT_FLAG),)
2213196a6e9SSatish Balay	$(call quiet,FCMOD) $(MODDIR) && $(FC) -c $(FC_FLAGS) $(FFLAGS) $(FCPPFLAGS) $(FC_DEPFLAGS) $(abspath $<) -o $(abspath $@)
22229921a8fSScott Krugerelse
2233196a6e9SSatish Balay	$(PETSC_COMPILE.F) $(abspath $<) -o $@ $(FC_MODULE_OUTPUT_FLAG)$(MODDIR)
2243196a6e9SSatish Balayendif
2250266c241SJed Brown	-@$(GFORTRAN_DEP_CLEANUP)
2263196a6e9SSatish Balay
227d615e4d1SJed Brown# Hack: manual dependencies on object files
228d615e4d1SJed Brownifeq ($(MPI_IS_MPIUNI),1)
2291a23cc6aSSatish Balay  MPIUNI_MOD := $(MODDIR)/mpiuni.mod
230fc44a252SSatish Balay  $(OBJDIR)/sys/mpiuni/fsrc/somempifort.o : $(OBJDIR)/sys/mpiuni/f90-mod/mpiunimod.o
231d615e4d1SJed Brownendif
23294666443SJed Brown$(OBJDIR)/sys/f90-mod/petscsysmod.o   : $(if $(MPIUNI_MOD),$(OBJDIR)/sys/mpiuni/f90-mod/mpiunimod.o)
23394666443SJed Brown$(OBJDIR)/vec/f90-mod/petscvecmod.o   : $(OBJDIR)/sys/f90-mod/petscsysmod.o
23494666443SJed Brown$(OBJDIR)/mat/f90-mod/petscmatmod.o   : $(OBJDIR)/vec/f90-mod/petscvecmod.o
23594666443SJed Brown$(OBJDIR)/dm/f90-mod/petscdmmod.o     : $(OBJDIR)/mat/f90-mod/petscmatmod.o
2367614c65cSBarry Smith$(OBJDIR)/dm/f90-mod/petscdmdamod.o   : $(OBJDIR)/dm/f90-mod/petscdmmod.o
23723928a85SSatish Balay$(OBJDIR)/dm/f90-mod/petscdmplexmod.o : $(OBJDIR)/dm/f90-mod/petscdmmod.o
23874d0cae8SMatthew G. Knepley$(OBJDIR)/dm/f90-mod/petscdmswarmmod.o : $(OBJDIR)/dm/f90-mod/petscdmmod.o
2397614c65cSBarry Smith$(OBJDIR)/ksp/f90-mod/petsckspdefmod.o : $(OBJDIR)/dm/f90-mod/petscdmplexmod.o
2407614c65cSBarry Smith$(OBJDIR)/ksp/f90-mod/petscpcmod.o    : $(OBJDIR)/ksp/f90-mod/petsckspdefmod.o
2417614c65cSBarry Smith$(OBJDIR)/ksp/f90-mod/petsckspmod.o   : $(OBJDIR)/ksp/f90-mod/petscpcmod.o
24294666443SJed Brown$(OBJDIR)/snes/f90-mod/petscsnesmod.o : $(OBJDIR)/ksp/f90-mod/petsckspmod.o
24394666443SJed Brown$(OBJDIR)/ts/f90-mod/petsctsmod.o     : $(OBJDIR)/snes/f90-mod/petscsnesmod.o
24494666443SJed Brown$(OBJDIR)/tao/f90-mod/petsctaomod.o   : $(OBJDIR)/ts/f90-mod/petsctsmod.o
2458e269d1cSSatish Balay# F2003 interface
24620170412SSatish Balay$(OBJDIR)/sys/objects/f2003-src/fsrc/optionenum.o   : $(OBJDIR)/sys/f90-mod/petscsysmod.o
24794666443SJed Brown$(OBJDIR)/sys/classes/bag/f2003-src/fsrc/bagenum.o  : $(OBJDIR)/sys/f90-mod/petscsysmod.o
248d615e4d1SJed Brown
2493a3a7c5dSSatish Balay# all sources should get recompiled when petscvariables changes (i.e when configure is rerun or when petscvariables is manually edited.)
2503a3a7c5dSSatish Balay$(srcs.o) : $(petscvariables)
251d4d7528cSSatish Balay
25237ed16bcSStefano Zampini.PHONY: clean all print
253b20fdbb7SJed Brown
254e551db17SScott Krugerclean:
255b0790570SJed Brown	${RM} -r $(OBJDIR) $(LIBDIR)/libpetsc* $(MODDIR)/petsc*.mod $(MPIUNI_MOD) $(generated)
256b20fdbb7SJed Brown
25737ed16bcSStefano Zampini# make print VAR=the-variable
25837ed16bcSStefano Zampiniprint:
2595b6dee57SScott Kruger	$(info $($(VAR)))
2605b6dee57SScott Kruger	@true
2615b6dee57SScott Kruger
26237ed16bcSStefano Zampini
263befe2181SJed Brownallobj.d := $(srcs.o:%.o=%.d)
264b20fdbb7SJed Brown# Tell make that allobj.d are all up to date.  Without this, the include
265b20fdbb7SJed Brown# below has quadratic complexity, taking more than one second for a
266b20fdbb7SJed Brown# do-nothing build of PETSc (much worse for larger projects)
267b20fdbb7SJed Brown$(allobj.d) : ;
268b20fdbb7SJed Brown
269b20fdbb7SJed Brown-include $(allobj.d)
270