Re: make -C libpq check fails obscurely if tap tests are disabled

On 2022-Jul-22, Tom Lane wrote:

> Barring objections, I'll push the attached patch. I suppose we
> could undo whatever dumbing-down was done in _create_recursive_target,
> but is it worth troubling with?

Excellent, many thanks. I tried to get Make 3.80 built here, to no
avail. I have updated that to 3.81, but still haven't found a way past
the automake phase.

Anyway, I tried a revert of 1bd201214965 -- I ended up with the
attached. However, while a serial compile fails, parallel ones fail
randomly, and apparently because two submakes compete in building
libpq.a and each deletes the other's file. What I think this is saying
is that the 3.80-induced wording of that function limits concurrency of
the generated recursive rules, which prevents the problem from
occurring; and if we were to fix that bug we would probably end up with
more concurrency.

Here's the bottom of the 'make -j8' log:

rm -f libpq.a
ranlib libpq.a
ranlib: 'libpq.a': No such file
make[5]: *** [/pgsql/source/master/src/Makefile.shlib:261: libpq.a] Error 1
make[5]: *** Waiting for unfinished jobs....
ar crs libpq.a fe-auth-scram.o fe-connect.o fe-exec.o fe-lobj.o fe-misc.o fe-print.o fe-protocol3.o fe-secure.o fe-trace.o legacy-pqsignal.o libpq-events.o pqexpbuffer.o fe-auth.o fe-secure-common.o fe-secure-openssl.o
ranlib libpq.a
touch libpq.a
rm -f libpq.so.5
ln -s libpq.so.5.16 libpq.so.5
rm -f libpq.so
ln -s libpq.so.5.16 libpq.so
touch libpq-refs-stamp
rm -f libpq.so.5
ln -s libpq.so.5.16 libpq.so.5
rm -f libpq.so
ln -s libpq.so.5.16 libpq.so
rm -f libpq.so.5
ln -s libpq.so.5.16 libpq.so.5
touch libpq-refs-stamp
rm -f libpq.so
gcc -Wall -Wmissing-prototypes -Wpointer-arith -Wdeclaration-after-statement -Werror=vla -Wendif-labels -Wmissing-format-attribute -Wimplicit-fallthrough=3 -Wcast-function-type -Wformat-security -fno-strict-aliasing -fwrapv -fexcess-precision=standard -Wno-format-truncation -Wno-stringop-truncation -g -O2 -pthread -D_REENTRANT -D_THREAD_SAFE -fPIC -shared -Wl,-soname,libecpg.so.6 -Wl,--version-script=exports.list -o libecpg.so.6.16 connect.o data.o descriptor.o error.o execute.o memory.o misc.o prepare.o sqlda.o typename.o -L../../../../src/port -L../../../../src/common -L../pgtypeslib -lpgtypes -L../../../../src/common -lpgcommon_shlib -L../../../../src/port -lpgport_shlib -L../../../../src/interfaces/libpq -lpq -L/usr/lib/llvm-11/lib -Wl,--as-needed -Wl,-rpath,'/pgsql/install/master/lib',--enable-new-dtags -lm
ln -s libpq.so.5.16 libpq.so
rm -f libecpg.a
make[4]: *** [../../../../src/Makefile.global:618: submake-libpq] Error 2
ar crs libecpg.a connect.o data.o descriptor.o error.o execute.o memory.o misc.o prepare.o sqlda.o typename.o
make[3]: *** [Makefile:17: all-ecpglib-recursive] Error 2
make[3]: *** Waiting for unfinished jobs....
ranlib libecpg.a
touch libecpg.a
rm -f libecpg.so.6
ln -s libecpg.so.6.16 libecpg.so.6
rm -f libecpg.so
ln -s libecpg.so.6.16 libecpg.so
gcc -Wall -Wmissing-prototypes -Wpointer-arith -Wdeclaration-after-statement -Werror=vla -Wendif-labels -Wmissing-format-attribute -Wimplicit-fallthrough=3 -Wcast-function-type -Wformat-security -fno-strict-aliasing -fwrapv -fexcess-precision=standard -Wno-format-truncation -Wno-stringop-truncation -g -O2 -pthread -D_REENTRANT -D_THREAD_SAFE -fPIC -shared -Wl,-soname,libecpg_compat.so.3 -Wl,--version-script=exports.list -o libecpg_compat.so.3.16 informix.o -L../../../../src/port -L../../../../src/common -L../ecpglib -lecpg -L../pgtypeslib -lpgtypes -L../../../../src/common -lpgcommon_shlib -L../../../../src/port -lpgport_shlib -L../../../../src/interfaces/libpq -lpq -L/usr/lib/llvm-11/lib -Wl,--as-needed -Wl,-rpath,'/pgsql/install/master/lib',--enable-new-dtags -lm
rm -f libecpg_compat.a
ar crs libecpg_compat.a informix.o
ranlib libecpg_compat.a
touch libecpg_compat.a
rm -f libecpg_compat.so.3
ln -s libecpg_compat.so.3.16 libecpg_compat.so.3
rm -f libecpg_compat.so
ln -s libecpg_compat.so.3.16 libecpg_compat.so
make[2]: *** [Makefile:17: all-ecpg-recursive] Error 2
make[1]: *** [Makefile:42: all-interfaces-recursive] Error 2
make: *** [GNUmakefile:11: all-src-recursive] Error 2

--
Álvaro Herrera PostgreSQL Developer — https://www.EnterpriseDB.com/
"Los dioses no protegen a los insensatos. Éstos reciben protección de
otros insensatos mejor dotados" (Luis Wu, Mundo Anillo)