On Sat, Mar 01, 2025 at 10:51:44AM +0000, Gavin Smith wrote:
> I had an idea that "locking" could be done in a separate helper program.
> The "make" rule would become something like:
>
> LOCK_ONCE=build_aux/lock-once.sh
>
> $(srcdir)/main/command_data.c $(srcdir)/main/command_ids.h
> $(srcdir)/main/global_multi_commands_case.c
> $(srcdir)/main/global_unique_commands_case.c
> $(srcdir)/main/global_commands_types.h: ../data/command_data.txt
> main/command_data.awk
> $(LOCK_ONCE) $(GAWK) -v srcdir=$(srcdir)/main -f
> $(srcdir)/main/command_data.awk \
> $(srcdir)/../data/command_data.txt
>
>
> Then all the complexity of checking for signals, clean-up etc. could
> go in the separate program.
>
A simpler solution could be to use the GNU make .NOTPARALLEL feature:
diff --git a/tta/C/Makefile.am b/tta/C/Makefile.am
index a93ead7b70..8409916b43 100644
--- a/tta/C/Makefile.am
+++ b/tta/C/Makefile.am
@@ -246,16 +246,21 @@ MAINTAINERCLEANFILES += main/element_types.c
main/element_types.h
TXI_MODULES_ENV = srcdir="$(srcdir)"; export srcdir;
-$(srcdir)/main/command_data.c $(srcdir)/main/command_ids.h
$(srcdir)/main/global_multi_commands_case.c
$(srcdir)/main/global_unique_commands_case.c
$(srcdir)/main/global_commands_types.h: ../data/command_data.txt
main/command_data.awk
+command_data_products = $(srcdir)/main/command_data.c
$(srcdir)/main/command_ids.h $(srcdir)/main/global_multi_commands_case.c
$(srcdir)/main/global_unique_commands_case.c
$(srcdir)/main/global_commands_types.h
+
+$(command_data_products): ../data/command_data.txt main/command_data.awk
$(GAWK) -v srcdir=$(srcdir)/main -f $(srcdir)/main/command_data.awk \
$(srcdir)/../data/command_data.txt
+.NOTPARALLEL: $(command_data_products)
MAINTAINERCLEANFILES += main/command_data.c main/command_ids.h
MAINTAINERCLEANFILES += main/global_multi_commands_case.c \
main/global_unique_commands_case.c
MAINTAINERCLEANFILES += main/global_commands_types.h
On GNU make, the parallel build is supposed to be disabled for the
dependencies of the .NOTPARALLEL target only. The behaviour differs
with other make programs.
