nawk @20121220_0: parallel build can produce broken program

[larryv (Lawrence Velázquez)]

I installed nawk a few hours ago to test an AWK script I’ve been writing, but it was completely nonfunctional.

% cat >/tmp/foo.txt <<EOF
heredoc> a
heredoc> b
heredoc> c
heredoc> EOF
% /opt/local/bin/nawk '{ print $0 }' </tmp/foo.txt
/opt/local/bin/nawk: syntax error at source line 1
 context is
	{ >>>  print <<<  $0 }
/opt/local/bin/nawk: illegal statement at source line 1
%

I rebuilt nawk a few times; several but not all of the builds actually did produce a working program.

% /opt/local/bin/nawk '{ print $0 }' </tmp/foo.txt
a
b
c
%

The attached patch​ disables parallel builds and seems to circumvent the issue entirely. (It’d be nice to fix the makefile, but the build is so quick that it doesn’t seem worth the effort.) It also revbumps to make sure broken installations are replaced.

[larryv (Lawrence Velázquez)]

log of a -j8 build that produced a bad program

[larryv (Lawrence Velázquez)]

log of a -j1 build that produced a good program

[larryv (Lawrence Velázquez)]

disable parallel builds and revbump

[larryv (Lawrence Velázquez)]

Some additional information, in case it’s of use.

% sw_vers
ProductName:	Mac OS X
ProductVersion:	10.11.5
BuildVersion:	15F34
% /usr/bin/clang -v
Apple LLVM version 7.3.0 (clang-703.0.29)
Target: x86_64-apple-darwin15.5.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
%

[larryv (Lawrence Velázquez)]

In da6f71a/macports-ports:

nawk: Disable parallel build

Due to incomplete dependency specifications, the makefile has a race
condition wherein some objects are compiled using the bundled parser
header and others with a newly generated one, successfully producing
a broken program. Pending development and submission of a proper fix,
work around the race condition by disabling parallel builds altogether.

Closes #51812 (timeout).