snippet/glconfig.mk

   1 # Copyright © 2011-2013, 2019, 2021-2023 Nick Bowler
   2 #
   3 # Automake fragment to generate a Gnulib config header to rewrite exported
   4 # symbols.  This fragment relies on the Gnulib makefile postprocessing done by
   5 # fix-gnulib.pl.  Furthermore, the following additions to configure.ac may be
   6 # required:
   7 #
   8 #   * Add AM_PROC_CC_C_O to configure.ac
   9 #   * Pass the desired symbol prefix to DX_GLSYM_PREFIX in configure.ac,
  10 #     after including the fix-gnulib.pl output.
  11 #
  12 # License WTFPL2: Do What The Fuck You Want To Public License, version 2.
  13 # This is free software: you are free to do what the fuck you want to.
  14 # There is NO WARRANTY, to the extent permitted by law.
  15
  16 GLCONFIG = @GLSRC@/glconfig.h
  17 GLCAT    = cat /dev/null
  18
  19 GLSYM_V   = $(GLSYM_V_@AM_V@)
  20 GLSYM_V_  = $(GLSYM_V_@AM_DEFAULT_V@)
  21 GLSYM_V_0 = @printf '  %$(DX_ALIGN_V)s %s\n' 'GLSYM   ' $<;
  22
  23 gnulib_headers += $(GLCONFIG)
  24
  25 # This suffix rule triggers symbol generation only on demand.  Dependencies are
  26 # not tracked directly, so it must remain phony and thus not create the target.
  27 .c.glsym:
  28         $(GLSYM_V) $(MKDIR_P) $(@D)/.syms
  29         $(AM_V_at) depfile=$(@D)/.syms/$(*F).deps \
  30                 source=$< object=$(GLCONFIG) $(CCDEPMODE) \
  31                 $(depcomp) $(COMPILE) -DNO_GLCONFIG \
  32                 -c -o $(@D)/.syms/$(*F).o $<
  33         $(AM_V_at) $(SHELL) $(top_builddir)/exported.sh \
  34                 $(@D)/.syms/$(*F).o > $(@D)/.syms/$(*F).sym
  35
  36 clean-local: clean-glconfig
  37 clean-glconfig:
  38         @for sym in $(libgnu_la_SOURCES) $(EXTRA_libgnu_la_SOURCES); do \
  39                 symdir=`expr "$$sym" : '\(.*/\)'`.syms; \
  40                 if test -d "$$symdir"; then \
  41                         echo "rm -rf $$symdir"; rm -rf "$$symdir"; \
  42                 fi; \
  43         done
  44 .PHONY: clean-glconfig
  45
  46 # Produce the list of all currently-enabled gnulib object files to assist with
  47 # external build helpers.
  48 GLCONFIG_OBJECTS = &1
  49 glconfig-objects:
  50         @:; { \
  51           for f in $(gnulib_objects); do echo "$$f"; done; \
  52         } >$(GLCONFIG_OBJECTS)
  53 .PHONY: glconfig-objects
  54
  55 # The config header requires compilation of all gnulib object files via the
  56 # .glsym rule above.  However, it cannot depend on those build products
  57 # directly because they are phony, and would make this header never up-to-date.
  58 #
  59 # Thus, we use a recursive make call to regenerate the header, which avoids
  60 # the need to list prerequisites.
  61 #
  62 # Since GNU make does not appear to allow the target of a suffix rule to be
  63 # marked .PHONY, we also delete the .glsym files here just in case they were
  64 # created for some reason (e.g., make -t).
  65 $(GLCONFIG): $(gnulib_core_headers)
  66         -$(AM_V_at) rm -f $(gnulib_symfiles)
  67         $(AM_V_at) $(MAKE) $(AM_MAKEFLAGS) glconfig-gen
  68         $(AM_V_GEN) mv -f $@.tmp $@
  69 CLEANFILES += $(GLCONFIG)
  70
  71 # The glconfig-gen target is intended only for use in recursive make
  72 # invocations.
  73 glconfig-gen: $(gnulib_symfiles)
  74         $(AM_V_at) $(MKDIR_P) @GLSRC@
  75         $(AM_V_at) depfiles=; symfiles=; \
  76         for sym in $(gnulib_symfiles); do \
  77           symdir=`expr "$$sym" : '\(.*/\)'`; \
  78           symfile=`expr "$$sym" : '.*/\(.*\)' || printf '%s\n' "$$sym"`; \
  79           symbase=$$symdir.syms/`expr "$$symfile" : '\(.*\)\..*'`; \
  80           test -f "$$symbase.deps" && \
  81             depfiles="$$depfiles $$symbase.deps"; \
  82             symfiles="$$symfiles $$symbase.sym"; \
  83         done; \
  84         $(glconfig_nodeps) \
  85           || $(GLCAT) $$depfiles > @GLSRC@/$(DEPDIR)/glconfig.Ph || exit; \
  86         $(GLCAT) $$symfiles | sed 's/.*/#define & $(GLSYM_PREFIX)&/' \
  87           >$(GLCONFIG).tmp
  88 .PHONY: glconfig-gen
  89
  90 if AMDEP
  91 glconfig_nodeps = false
  92 @am__include@ @am__quote@@GLSRC@/$(DEPDIR)/glconfig.Ph@am__quote@@dx_include_marker@
  93 else
  94 glconfig_nodeps = true
  95 endif
  96
  97 # Automake 1.16 and newer use make rules to generate the dependency stubs.
  98 # we must hook those which is kind of annoying to do.  This should be harmless
  99 # on previous versions which generate the stubs directly in config.status.
 100 @dx_depfiles_target@: @GLSRC@/$(DEPDIR)/glconfig.Ph
 101 @GLSRC@/$(DEPDIR)/glconfig.Ph:
 102         @$(MKDIR_P) $(@D)
 103         @echo '# dummy' >$@-t && mv -f $@-t $@
 104 DISTCLEANFILES += @GLSRC@/$(DEPDIR)/glconfig.Ph