[ruby-core:96404] [Ruby master Bug#16331] fails to build with BSD make when any -j option is given (including -j 1)

Issue #16331 has been updated by yasuhirokimura (Yasuhiro KIMURA).

File buildtest-with-bmake-and-j-option.log added

I executed following shell script on my FreeBSD test environment and got attached log file.

``` shell
#!/bin/sh

LANG=C
(
    echo System Information:
    echo ----------------------------------------------------------------------
    dmesg
    echo ----------------------------------------------------------------------
    echo Package Information:
    echo ----------------------------------------------------------------------
    pkg info -aq
    echo ----------------------------------------------------------------------
    cd /tmp
    for ver in 2.6.5 2.7.0-rc2
    do
        echo Test build of ${ver}:
        tar xfpJ /net/freebsd/ports/distfiles/ruby/ruby-${ver}.tar.xz
        cd ruby-${ver}
        echo Configure:
        echo ----------------------------------------------------------------------
        ./configure
        echo ----------------------------------------------------------------------
        echo Build:
        echo ----------------------------------------------------------------------
        make -j $(sysctl -n kern.smp.cpus)
        echo ----------------------------------------------------------------------
        cd ..
        rm -rf ruby-${ver}
    done
) | 2>&1 tee buildtest-with-bmake-and-j-option.log
```

As you can see, `make -j` works fine with 2.6.5 but fails with 2.7.0-rc2.


----------------------------------------
Bug #16331: fails to build with BSD make when any -j option is given (including -j 1)
https://bugs.ruby-lang.org/issues/16331#change-83329

* Author: [email protected] (Koichiro Iwao)
* Status: Closed
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 2.6.5
* Backport: 2.5: REQUIRED, 2.6: REQUIRED
----------------------------------------
When building Ruby parallely with BSD make (FreeBSD make), it fails to build.
Reported by FreeBSD Ruby folks. Please keep in mind I didn't find out the root cause.

OS: FreeBSD 12-STABLE
See also: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241633

## How to reproduce
```
tar xf ruby-2.6.5.tar.gz
cd ruby-2.6.5
./configure --enable-shared --disable-readline --disable-libedit
make -j 8 # any value will cause build failure
(snip)
configuring -test-/st/numhash
configuring -test-/st/update
--- enc ---
ld: error: unable to find library -lruby
cc: error: linker command failed with exit code 1 (use -v to see invocation)
--- exts.mk ---
configuring -test-/string
configuring -test-/struct
configuring -test-/symbol
--- enc ---
*** [.ext/x86_64-freebsd12.1/enc/encdb.so] Error code 1
```

## BSD make without -j option: success
```
cd ruby-2.6.5
make distclean
./configure --enable-shared --disable-readline --disable-libedit
make
`ruby' is up to date.
*** Following extensions are not compiled:
readline:
	Could not be configured. It will not be installed.
	/home/sair/tmp/ruby-2.6.5/ext/readline/extconf.rb:52: readline not found
	Check ext/readline/mkmf.log for more details.
gdbm:
	Could not be configured. It will not be installed.
	Check ext/gdbm/mkmf.log for more details.
*** Fix the problems, then remove these directories and try again if you want.
making enc
making trans
`trans' is up to date.
making encs
Generating RDoc documentation
```

## Using GNU make: success

```
cd ruby-2.6.5
export MAKE=gmake # GNU make
make distclean
./configure --enable-shared --disable-readline --disable-libedit
$MAKE -j 8
```

---Files--------------------------------
ruby-bsdmake.log (13.9 KB)
buildtest-with-bmake-and-j-option.log (202 KB)


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