Re: [COMMITTERS] pgsql: Improved parallel make support

BTW, there's another problem here: "make -j2" on my Mac blows up with
this on stderr:

ld: file not found: ../../../../../../src/backend/postgres
collect2: ld returned 1 exit status
make[3]: *** [ascii_and_mic.so] Error 1
make[2]: *** [all-ascii_and_mic-recursive] Error 2
make[1]: *** [all-backend/utils/mb/conversion_procs-recursive] Error 2
make[1]: *** Waiting for unfinished jobs....
In file included from gram.y:12101:
scan.c: In function 'yy_try_NUL_trans':
scan.c:16242: warning: unused variable 'yyg'
make: *** [all-src-recursive] Error 2

Consulting stdout shows that indeed it's launched this series of jobs:

make -C backend/utils/mb/conversion_procs all
make -C ascii_and_mic all
gcc -O2 -Wall -Wmissing-prototypes -Wpointer-arith -Wdeclaration-after-statement -Wendif-labels -fno-strict-aliasing -fwrapv -g -I../../../../../../src/include -c -o ascii_and_mic.o ascii_and_mic.c
gcc -O2 -Wall -Wmissing-prototypes -Wpointer-arith -Wdeclaration-after-statement -Wendif-labels -fno-strict-aliasing -fwrapv -g -bundle -multiply_defined suppress -o ascii_and_mic.so ascii_and_mic.o -L../../../../../../src/port -Wl,-d\
ead_strip_dylibs -bundle_loader ../../../../../../src/backend/postgres

immediately after completing the src/timezone build, before the backend
build is even well begun let alone finished. So the parallel build
dependency interlocks are basically not working. This machine has gmake
3.81.

regards, tom lane