On Sun, Jan 31, 2021 at 10:14:11PM +0000, Gavin Smith wrote: > Another issue is how to record the results of tests from a a Makefile. > With autoconf, autoconf variables are recorded with AC_CONFIG_FILES > and AC_CONFIG_HEADERS. Presumably the same would have to be done, > substituting in an output file with the values of these variables. > However, there can be many hundreds of them (just look at a Makefile.in > file). As far as I can tell, there isn't an easy way to export > hundreds of Makefile variables to a process. Is there some feature or > trick I'm missing? I was mislead by the Make manual talking about communicating with a sub-make: the .EXPORT_ALL_VARIABLES target appears to export for any rule (although I didn't get the $(export) directive to work for this). This could be used by a helper script to do substitution. The "finish-configure" target in the following outputs "1 2 3": .EXPORT_ALL_VARIABLES: set-A: $(eval A := $(shell echo 1)) set-B: $(eval B := $(shell echo 2)) set-C: $(eval C := $(shell echo 3)) finish-configure: set-A set-B set-C echo $$A $$B $$C
