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To reduce the amount of boilerplate in the makefiles.
This amends commit 9789c263a ("build: disable all built-in implicit make
rules", 2023-06-21) / PR #5864.
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Use `make -r` to reduce unnecessary filesystem lookups.
Overall, this appears to reduce the amount of implicit rule searches by
~93.3% (~97.5% compared to a8f01a383) for the default build and by
~83.3% (~99.3% compared to a8f01a383) for the "man" target (as an
example):
$ git show --pretty='%h %ai %s' -s
a8f01a383 2023-06-20 05:26:23 +0000 Merge pull request #5859 from kmk3/build-remove-retpoline
$ ./configure >/dev/null
$ make clean >/dev/null && make --debug=i -j 4 | grep -F 'Trying implicit' | wc -l
6798
$ make clean >/dev/null && make --debug=i -j 4 man | grep -F 'Trying implicit' | wc -l
1085
# (in the previous commit)
$ make clean >/dev/null && make --debug=i -j 4 | grep -F 'Trying implicit' | wc -l
2535
$ make clean >/dev/null && make --debug=i -j 4 man | grep -F 'Trying implicit' | wc -l
42
# (with this commit applied)
$ make clean >/dev/null && make --debug=i -j 4 | grep -F 'Trying implicit' | wc -l
170
$ make clean >/dev/null && make --debug=i -j 4 man | grep -F 'Trying implicit' | wc -l
7
Environment: GNU make 4.4.1-2 on Artix Linux.
Note: According to make(1p) in POSIX.1-2017, "If .SUFFIXES does not have
any prerequisites, the list of known suffixes shall be cleared.", while
"The result of setting MAKEFLAGS in the Makefile is unspecified."
Commands used to search and replace:
$ git ls-files -z -- '*Makefile*' | xargs -0 -I '{}' sh -c \
"printf '%s\n' \"\$(sed -E \
's/^(.SUFFIXES:)/\1\nMAKEFLAGS += -r\n/' '{}')\" >'{}'"
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Clear `.SUFFIXES:` to reduce unnecessary filesystem lookups.
Overall, this appears to reduce the amount of implicit rule searches by
~62% for the default build and by ~96% for the "man" target (as an
example):
$ git checkout master >/dev/null 2>&1
$ git show --pretty='%h %ai %s' -s
a8f01a383 2023-06-20 05:26:23 +0000 Merge pull request #5859 from kmk3/build-remove-retpoline
$ ./configure >/dev/null
$ make clean >/dev/null && make --debug=i -j 4 | grep -F 'Trying implicit' | wc -l
6798
$ make clean >/dev/null && make --debug=i -j 4 man | grep -F 'Trying implicit' | wc -l
1085
# (with this commit applied)
$ make clean >/dev/null && make --debug=i -j 4 | grep -F 'Trying implicit' | wc -l
2535
$ make clean >/dev/null && make --debug=i -j 4 man | grep -F 'Trying implicit' | wc -l
42
Environment: GNU make 4.4.1-2 on Artix Linux.
Commands used to search and replace:
$ git ls-files -z -- '*Makefile*' | xargs -0 -I '{}' sh -c \
"printf '%s\n' \"\$(sed '1s/^/.SUFFIXES:\n/' '{}')\" >'{}'"
See also commit f48886f25 ("build: mark most phony targets as such",
2023-02-01) / PR #5637.
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This is causing main.o to be built using an implicit rule (rather than
the rule from src/prog.mk), which does not use PROG_CFLAGS. Example
(using src/fldd as a working example for comparison):
$ make -C src/etc-cleanup clean >/dev/null &&
make -C src/etc-cleanup | grep -Ev '(Entering|Leaving) directory'
gcc -g -O2 -c -o main.o main.c
gcc -pie -fPIE -Wl,-z,relro -Wl,-z,now -o etc-cleanup main.o
$ make -C src/etc-cleanup clean >/dev/null &&
make -C src/etc-cleanup -r | grep -Ev '(Entering|Leaving) directory'
make: *** No rule to make target 'main.o', needed by 'etc-cleanup'. Stop.
$ make -C src/fldd clean >/dev/null &&
make -C src/fldd | grep -Ev '(Entering|Leaving) directory'
gcc -ggdb -O2 -DVERSION='"0.9.73"' -fstack-protector-all [...]
gcc -pie -fPIE -Wl,-z,relro -Wl,-z,now -o fldd main.o ../lib/common.o ../lib/ldd_utils.o
$ make -C src/fldd clean >/dev/null &&
make -C src/fldd -r | grep -Ev '(Entering|Leaving) directory'
gcc -ggdb -O2 -DVERSION='"0.9.73"' -fstack-protector-all [...]
gcc -pie -fPIE -Wl,-z,relro -Wl,-z,now -o fldd main.o ../lib/common.o ../lib/ldd_utils.o
Environment: GNU make 4.4.1-2 on Artix Linux.
This amends commit e889db095 ("build fix", 2023-02-06).
See also commit 02d37680c ("private-etc rework: file groups moved to
src/include/etc_groups.h, new groups added", 2023-01-25).
Relates to #5610.
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Kelvin M. Klann
netblue30