915960 - Fall back to ar on PATH if AR is not defined, instead of ":"

Status: NEW

(Firefox Build System :: General, defect)

Description

[Gary Kwong [:gkw] [:nth10sd] (NOT official MoCo now)]

Attachment: log

Traceback (most recent call last):
  File "/home/fuzz5lin/Desktop/js-dbg-32-linux-mozilla-central-146872-cdfeb4aaea9c-9zV77s/compilePath/js/src/config/expandlibs_exec.py", line 340, in <module>
    main()
  File "/home/fuzz5lin/Desktop/js-dbg-32-linux-mozilla-central-146872-cdfeb4aaea9c-9zV77s/compilePath/js/src/config/expandlibs_exec.py", line 321, in main
    proc = subprocess.Popen(args, stdout = subprocess.PIPE, stderr = subprocess.STDOUT)
  File "/usr/lib/python2.7/subprocess.py", line 679, in __init__
    errread, errwrite)
  File "/usr/lib/python2.7/subprocess.py", line 1259, in _execute_child
    raise child_exception
OSError: [Errno 2] No such file or directory
make[1]: *** [libjs_static.a] Error 1

On a pandaboard, I compile using:

CC="gcc -mfloat-abi=softfp -B/usr/lib/gcc/arm-linux-gnueabi/4.7" CXX="g++ -mfloat-abi=softfp -B/usr/lib/gcc/arm-linux-gnueabi/4.7" sh ./configure --target=arm-linux-gnueabi --enable-optimize --enable-debug --enable-profiling --enable-gczeal --without-intl-api --enable-debug-symbols --enable-methodjit --enable-type-inference --disable-tests --with-ccache

but I hit this Python error, which doesn't seem like a compilation error with gcc, but perhaps something with expandlibs_exec.py?

I'm on Ubuntu Linux 12.10 Quantal, and this blocks fuzzing softfp js shells.

gps / ted, any ideas?

Comment 1

[Gary Kwong [:gkw] [:nth10sd] (NOT official MoCo now)]

(for all I know, it may be something specific to my configuration, but I've already plunged too much time trying to debug this myself :( )

More specifically, I'm not sure how to debug *exactly* which file or directory is missing, to serve up the "No such file" error

Comment 2

[(not currently active) Ted Mielczarek]

You're missing "ar" (I wish Python's error message for this case was more useful.) From your log:

"--target libjs_static.a --extract -- : cr libjs_static.a"

I've never been sure why we fall back to ":" for AR:
http://mxr.mozilla.org/mozilla-central/source/build/autoconf/toolchain.m4#102

Comment 3

[Gary Kwong [:gkw] [:nth10sd] (NOT official MoCo now)]

(In reply to Ted Mielczarek [:ted.mielczarek] from comment #2)
> You're missing "ar" (I wish Python's error message for this case was more
> useful.) From your log:
> 
> "--target libjs_static.a --extract -- : cr libjs_static.a"
> 
> I've never been sure why we fall back to ":" for AR:
> http://mxr.mozilla.org/mozilla-central/source/build/autoconf/toolchain.m4#102

Adding a AR="ar" on my compile line made it work, thanks Ted! I shall morph this bug to enable the build system to fall back on ar on PATH (in my case /usr/bin/ar) if AR is not specified.