[ruby-core:88428] [Ruby trunk Bug#11913] make fails when using a custom build directory

Issue #11913 has been updated by ioquatix (Samuel Williams).


I ran into this problem, and I think it was because I had tried building in the root directory. I did `make clean` and it seems to solve this issue. I think we can close this issue, but it might be worth adding to the Contributing document.

----------------------------------------
Bug #11913: make fails when using a custom build directory
https://bugs.ruby-lang.org/issues/11913#change-73480

* Author: mcmire (Elliot Winkler)
* Status: Feedback
* Priority: Normal
* Assignee: nobu (Nobuyoshi Nakada)
* Target version: 
* ruby -v: 2.4.0dev
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
----------------------------------------
Hi there. I've been trying to submit a bugfix, and in doing so I realized that I had to compile Ruby so that I could run all of the tests. I made a fresh clone of Ruby, and started following the [Contributing document](https://github.com/ruby/ruby/blob/trunk/doc/contributing.rdoc), but then ran into some issues.

These instructions have you run `./configure` from another directory (`build`) that is not the root directory of the repo. Unfortunately, running `make` did not seem to work, and here was the output:

~~~
賊 make
        CC = clang
        LD = ld
        LDSHARED = clang -dynamic -bundle
        CFLAGS = -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Werror=pointer-arith -Werror=write-strings
 -Werror=declaration-after-statement -Werror=shorten-64-to-32 -Werror=implicit-function-declaration -Werror=division-by-zero -Werror=deprecated-declarations -Werror=extra-tokens   -pipe
        XCFLAGS = -D_FORTIFY_SOURCE=2 -fstack-protector -fno-strict-overflow -fvisibility=hidden -DRUBY_EXPORT -fPIE
        CPPFLAGS = -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -D_DARWIN_UNLIMITED_SELECT -D_REENTRANT   -I. -I.ext/include/x86_64-darwin15 -I../include -I..
        DLDFLAGS = -Wl,-undefined,dynamic_lookup -Wl,-multiply_defined,suppress -fstack-protector -Wl,-u,_objc_msgSend -Wl,-pie -framework CoreFoundation
        SOLIBS =
Apple LLVM version 7.0.2 (clang-700.1.81)
Target: x86_64-apple-darwin15.2.0
Thread model: posix
compiling ../main.c
compiling ../dmydln.c
compiling ../miniinit.c
compiling ../array.c
compiling ../bignum.c
compiling ../class.c
compiling ../compar.c
compiling ../complex.c
compiling ../dir.c
compiling ../dln_find.c
compiling ../encoding.c
compiling ../enum.c
compiling ../enumerator.c
compiling ../error.c
compiling ../eval.c
compiling ../load.c
compiling ../proc.c
compiling ../file.c
compiling ../gc.c
compiling ../hash.c
compiling ../inits.c
compiling ../io.c
compiling ../marshal.c
compiling ../math.c
compiling ../node.c
compiling ../numeric.c
compiling ../object.c
compiling ../pack.c
compiling ../parse.c
compiling ../process.c
compiling ../random.c
compiling ../range.c
compiling ../rational.c
compiling ../re.c
compiling ../regcomp.c
compiling ../regenc.c
compiling ../regerror.c
compiling ../regexec.c
compiling ../regparse.c
compiling ../regsyntax.c
compiling ../ruby.c
compiling ../safe.c
compiling ../signal.c
compiling ../sprintf.c
compiling ../st.c
compiling ../strftime.c
compiling ../string.c
compiling ../struct.c
compiling ../symbol.c
compiling ../time.c
compiling ../transcode.c
compiling ../util.c
compiling ../variable.c
compiling ../version.c
compiling ../compile.c
compiling ../debug.c
compiling ../iseq.c
compiling ../vm.c
compiling ../vm_dump.c
compiling ../vm_backtrace.c
compiling ../vm_trace.c
compiling ../thread.c
compiling ../cont.c
compiling ../enc/ascii.c
error: unable to open output file 'enc/ascii.o': 'No such file or directory'
1 error generated.
make: *** [enc/ascii.o] Error 1
~~~

`make` generated this error, as I found out, because `build` did not contain an `enc` directory.

So after running `make clean`, then `mkdir -p enc/trans` from within `build` (as it turns out, `enc/trans` also needed to be present), I then ran `make` again, and got this:

~~~
賊 make
        CC = clang
        LD = ld
        LDSHARED = clang -dynamic -bundle
        CFLAGS = -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Werror=pointer-arith -Werror=write-strings
 -Werror=declaration-after-statement -Werror=shorten-64-to-32 -Werror=implicit-function-declaration -Werror=division-by-zero -Werror=deprecated-declarations -Werror=extra-tokens   -pipe
        XCFLAGS = -D_FORTIFY_SOURCE=2 -fstack-protector -fno-strict-overflow -fvisibility=hidden -DRUBY_EXPORT -fPIE
        CPPFLAGS = -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -D_DARWIN_UNLIMITED_SELECT -D_REENTRANT   -I. -I.ext/include/x86_64-darwin15 -I../include -I..
        DLDFLAGS = -Wl,-undefined,dynamic_lookup -Wl,-multiply_defined,suppress -fstack-protector -Wl,-u,_objc_msgSend -Wl,-pie -framework CoreFoundation
        SOLIBS =
Apple LLVM version 7.0.2 (clang-700.1.81)
Target: x86_64-apple-darwin15.2.0
Thread model: posix
compiling ../enc/trans/newline.c
compiling ../missing/explicit_bzero.c
compiling ../missing/setproctitle.c
linking miniruby
clang: error: no such file or directory: 'dmyext.o'
clang: error: no such file or directory: 'miniprelude.o'
make: *** [miniruby] Error 1
~~~

I didn't know what to do with this. `dmyext.o` and `miniprelude.o` are present within the repo, but for some reason, `make` wants them to be present within `build`.

After running `./configure` from within the root directory, then `make` worked successfully.

So what I suppose is that there's something inside of the makefiles that still makes the assumption that `make` is going to be run inside of the root directory. But that's just a hunch.



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