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[SV 14927] Allow parallel builds for archives

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Compare the timestamp of the object file (if it exists) with the
archived object and if the object file is newer, ensure it's updated
in the archive.

* NEWS: Announce the new capability.
* doc/make.texi (Dangers When Using Archives): Explain how to enable
parallel builds with archives.
* src/remake.c (f_mtime): For archive element files check the mod
time of the object file (if it exists) against the archive object
(if it exists).
* tests/scripts/features/archives: Add tests for this capability.
This commit is contained in:
Paul Smith
2023-01-03 01:57:35 -05:00
parent 8791d2b38e
commit 1ceeb8c64b
4 changed files with 86 additions and 16 deletions
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36
tests/scripts/features/archives
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@@ -20,9 +20,7 @@ if ($osname eq 'VMS') {
# objects when the test tampers with the timestamp.
1 while unlink "$afile.c1";
1 while unlink "$afile.o";
open (MYFILE, ">$afile.c1");
print MYFILE "int $afile(void) {return 1;}\n";
close MYFILE;
create_file("$afile.c1", "int $afile(void) {return 1;}\n");
system("cc $afile.c1 /object=$afile.o");
}
} else {
@@ -238,5 +236,37 @@ $pre%: ; touch \$\@
unlink($lib);
}
# SV 61436 : Allow redefining archive rules to propagate timestamps
# Find the output when creating an archive from multiple files
utouch(-10, 'a.o', 'b.o');
my $create2 = `$ar $arflags mylib.a a.o b.o $redir`;
touch('b.o');
my $add2 = `$ar $arflags mylib.a b.o $redir`;
unlink('a.o', 'b.o', 'mylib.a');
utouch(-20, 'a.c', 'b.c');
run_make_test(q!
mylib.a: mylib.a(a.o b.o)
(%): % ;
%.a: ; $(AR) $(ARFLAGS) $@ $?
%.o : %.c ; @echo Compile $<; $(COMPILE.c) -o $@ $<
!, $arvar, "Compile a.c\nCompile b.c\n$ar $arflags mylib.a a.o b.o\n${create2}rm b.o a.o");
run_make_test(undef, $arvar, "#MAKE#: 'mylib.a' is up to date.");
# Now update one of the source files and it should be compiled and archived
sleep(2);
touch('b.c');
run_make_test(undef, $arvar, "Compile b.c\n$ar $arflags mylib.a b.o\n${add2}rm b.o");
run_make_test(undef, $arvar, "#MAKE#: 'mylib.a' is up to date.");
unlink('a.c', 'b.c', 'a.o', 'b.o', 'mylib.a');
# This tells the test driver that the perl test script executed properly.
1;