| 1 | ## automake - create Makefile.in from Makefile.am
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| 2 | ## Copyright (C) 1994-1998, 1999 Free Software Foundation, Inc.
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| 3 |
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| 4 | ## This program is free software; you can redistribute it and/or modify
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| 5 | ## it under the terms of the GNU General Public License as published by
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| 6 | ## the Free Software Foundation; either version 2, or (at your option)
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| 7 | ## any later version.
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| 8 |
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| 9 | ## This program is distributed in the hope that it will be useful,
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| 10 | ## but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 11 | ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 12 | ## GNU General Public License for more details.
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| 13 |
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| 14 | ## You should have received a copy of the GNU General Public License
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| 15 | ## along with this program; if not, write to the Free Software
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| 16 | ## Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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| 17 | ## 02111-1307, USA.
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| 18 | %.o: %@EXT@
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| 19 | @echo '$(@PFX@COMPILE) -c $<'; \
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| 20 | ## There are various ways to get dependency output from gcc. Here's
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| 21 | ## why we pick this rather obscure method:
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| 22 | ## - Don't want to use -MD because we'd like the dependencies to end
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| 23 | ## up in a subdir. Having to rename by hand is ugly.
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| 24 | ## (We might end up doing this anyway to support other compilers.)
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| 25 | ## - The DEPENDENCIES_OUTPUT environment variable makes gcc act like
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| 26 | ## -MM, not -M (despite what the docs say).
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| 27 | ## - Using -M directly means running the compiler twice (even worse
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| 28 | ## than renaming).
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| 29 | $(@PFX@COMPILE) -Wp,-MD,.deps/$(*F).pp -c $<
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| 30 | ## This next piece of magic avoids the `deleted header file' problem.
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| 31 | ## The problem is that when a header file which appears in a .P file
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| 32 | ## is deleted, the dependency causes make to die (because there is
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| 33 | ## typically no way to rebuild the header). We avoid this by adding
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| 34 | ## dummy dependencies for each header file. Too bad gcc doesn't do
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| 35 | ## this for us directly.
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| 36 | @-cp .deps/$(*F).pp .deps/$(*F).P; \
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| 37 | tr ' ' '\012' < .deps/$(*F).pp \
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| 38 | ## Some versions of gcc put a space before the `:'. On the theory
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| 39 | ## that the space means something, we add a space to the output as
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| 40 | ## well.
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| 41 | | sed -e 's/^\\$$//' -e '/^$$/ d' -e '/:$$/ d' -e 's/$$/ :/' \
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| 42 | >> .deps/$(*F).P; \
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| 43 | rm .deps/$(*F).pp
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| 44 |
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| 45 | %.lo: %@EXT@
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| 46 | @echo '$(LT@PFX@COMPILE) -c $<'; \
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| 47 | ## See above to understand implementation weirdness.
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| 48 | $(LT@PFX@COMPILE) -Wp,-MD,.deps/$(*F).pp -c $<
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| 49 | ## Account for versions of gcc that put a space before the `:'.
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| 50 | @-sed -e 's/^\([^:]*\)\.o[ ]*:/\1.lo \1.o :/' \
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| 51 | < .deps/$(*F).pp > .deps/$(*F).P; \
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| 52 | ## See above to understand deleted header file trick.
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| 53 | tr ' ' '\012' < .deps/$(*F).pp \
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| 54 | ## Some versions of gcc put a space before the `:'. On the theory
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| 55 | ## that the space means something, we add a space to the output as
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| 56 | ## well.
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| 57 | | sed -e 's/^\\$$//' -e '/^$$/ d' -e '/:$$/ d' -e 's/$$/ :/' \
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| 58 | >> .deps/$(*F).P; \
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| 59 | rm -f .deps/$(*F).pp
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