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examples: fix missing dependencies

Reported by Thomas Petazzoni.

* examples/c/reccalc/ Complete dependencies, including for
earlier versions of Automake (for sake of our CI, on top of Ubuntu
Xenial/Bionic, which feature only Automake 1.15).
(%D%/scan.c %D%/scan.h): Upgrade to the full version provided in
Automake's documentation.
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akimd committed Aug 3, 2019
1 parent fa9871a commit 719395c9cda26286476b94e9a97e27e54a2bde36
Showing with 31 additions and 3 deletions.
  1. +1 −0 THANKS
  2. +3 −0
  3. +27 −3 examples/c/reccalc/
@@ -175,6 +175,7 @@ Sum Wu
Théophile Ranquet
Thiru Ramakrishnan
Thomas Jahns
Thomas Petazzoni
Tim Josling
Tim Landscheidt
Tim Van Holder
@@ -36,6 +36,9 @@ AC_CONFIG_MACRO_DIR([m4])

# We use Automake 1.14's %D% and %C%.
# When we move to Automake 1.16, simplify examples/c/reccalc/
# Our CI runs on Xenial, which has only Automake 1.15.
# We want gnits strictness only when rolling a stable release. For
# release candidates, we use version strings like 2.4.3_rc1, but gnits
# doesn't like that, so we let the underscore disable gnits. Between
@@ -36,16 +36,40 @@ endif FLEX_WORKS
# additional dependency.
DASH = -
%D%/reccalc$(DASH)parse.o: %D%/scan.h
# Tell Make scan.o depends on parse.h, except that Make sees only
# parse.c, not parse.h. We can't use BUILT_SOURCES to this end, since
# we use the built bison.
%D%/reccalc$(DASH)scan.o: %D%/parse.c

# Likewise, but for Automake before 1.16.
%D%/examples_c_reccalc_reccalc$(DASH)parse.o: %D%/scan.h
%D%/examples_c_reccalc_reccalc$(DASH)scan.o: %D%/parse.c

## See "info automake 'Multiple Outputs'" for this rule.
%D%/scan.c %D%/scan.h: %D%/scan.stamp
@test -f $@ || rm -f %D%/scan.stamp
@test -f $@ || $(MAKE) $(AM_MAKEFLAGS) %D%/scan.stamp
## Recover from the removal of $@
@if test -f $@; then :; else \
trap 'rm -rf %D%/scan.lock %D%/scan.stamp' 1 2 13 15; \
## mkdir is a portable test-and-set
if mkdir %D%/scan.lock 2>/dev/null; then \
## This code is being executed by the first process.
rm -f %D%/scan.stamp; \
$(MAKE) $(AM_MAKEFLAGS) %D%/scan.stamp; \
result=$$?; rm -rf %D%/scan.lock; exit $$result; \
else \
## This code is being executed by the follower processes.
## Wait until the first process is done.
while test -d %D%/scan.lock; do sleep 1; done; \
## Succeed if and only if the first process succeeded.
test -f %D%/scan.stamp; \
fi; \

%D%/scan.stamp: %D%/scan.l
$(AM_V_LEX)rm -f $@ $@.tmp
$(AM_V_at)$(MKDIR_P) %D%
$(AM_V_at)touch $@.tmp
$(AM_V_at)$(LEX) -o%D%/scan.c --header-file=%D%/scan.h $(srcdir)/%D%/scan.l
$(AM_V_at)$(LEX) $(AM_LFLAGS) $(LFLAGS) -o%D%/scan.c --header-file=%D%/scan.h $(srcdir)/%D%/scan.l
$(AM_V_at)mv $@.tmp $@

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