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Configure summary: autoconf essentially only parses configure.ac and
generates the configure script (that is, the "./configure" shell
script). The latter is what actually checks what is available on the
system and internally sets the value of the output variables. It then,
for every filename foo in AC_CONFIG_FILES (and for every output variable
name BAR in AC_SUBST), reads foo.in, replaces every occurrence of
`@BAR@` with the value of the shell variable `$BAR` and generates the
file foo from the result. After this, configure is finished and `make`
could be executed to start the build.
Now that (as of #5140) all output variables are only defined on
config.mk.in and on config.sh.in, there is no need to generate any
makefile nor any other mkfile or shell script at configure time. So
rename every "Makefile.in" to "Makefile", mkdeb.sh.in to mkdeb.sh,
src/common.mk.in to src/common.mk and leave just config.mk and config.sh
as the files to be generated at configure time.
This allows editing and committing all makefiles directly, without
potentially having to run ./configure in between.
Commands used to rename the makefiles:
$ git ls-files -z -- '*Makefile.in' | xargs -0 -I '{}' sh -c \
"git mv '{}' \"\$(dirname '{}')/Makefile\""
Additionally, from my (rudimentary) testing, this commit reduces the
time it takes to run ./configure by about 20~25% compared to commit
72ece92ea ("Transmission fixes: drop private-lib (#5213)", 2022-06-22).
Environment: dash 0.5.11.5-1, gcc 12.1.0-2, Artix Linux, ext4 on an HDD.
Commands used for benchmarking each commit:
$ : >time_configure && ./configure && make distclean &&
for i in $(seq 1 10); do
{ time -p ./configure; } 2>>time_configure; done
$ grep real time_configure |
awk '{ total += $2 } END { print total/NR }'
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A non-absolute path on an include command is always treated as being
relative to the directory in which "make" was started in, rather than
being relative to the makefile that contains the command. For example,
given the following project structure and file contents:
* Makefile: include src/foo.mk
* src/foo.mk: include bar.mk
* src/bar.mk:
Running "make" on the root project directory (that is, where "Makefile"
is) yields the following:
src/foo.mk:1: bar.mk: No such file or directory
As "bar.mk" in "include bar.mk" is relative to the current (process)
directory (that is, "./bar.mk") and not to where foo.mk is located in
("./src/bar.mk").
So on every makefile that contains an include command, define the root
project directory in the ROOT variable and always include relative to
it, to later enable any included mkfiles to include other mkfiles
without having to worry about the correct path.
Commands used to search and replace:
$ git grep -Flz 'include ../common.mk' -- src |
xargs -0 -I '{}' sh -c \
"printf '%s\n' \"\`sed 's|include ../common.mk|ROOT = ../..\ninclude \$(ROOT)/src/common.mk|' '{}'\`\" >'{}'"
Environment: GNU make 4.3-3.1 on Artix Linux
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Avoid a stat() call for each affected target and also potentially speed
up parallel builds.
From the GNU make manual[1]:
> Phony targets are also useful in conjunction with recursive
> invocations of make (see Recursive Use of make). In this situation
> the makefile will often contain a variable which lists a number of
> sub-directories to be built.
[...]
> The implicit rule search (see Implicit Rules) is skipped for .PHONY
> targets. This is why declaring a target as .PHONY is good for
> performance, even if you are not worried about the actual file
> existing.
Commands used to search, replace and cleanup:
$ find -type f -name '*Makefile.in' -exec sed -i.bak \
-e 's/^all:/.PHONY: all\nall:/' \
-e 's/^clean:/.PHONY: clean\nclean:/' \
-e 's/^distclean:/.PHONY: distclean\ndistclean:/' '{}' +
$ find -type f -name '*Makefile.in.bak' -exec rm '{}' +
[1]: https://www.gnu.org/software/make/manual/html_node/Phony-Targets.html
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(hopefully) fixes the issues that led to reverting
commits 6abb65d328af61d67361890743190bd4c57f8e3c and 98e42dc6da4e4b1e47ed2aa020012d4dedc1e80e
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https://bugs.debian.org/869707
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Kelvin M. Klann
smitsohu
netblue30
Helmut Grohne
Fred Barclay