Re: Test failures when Git is built with libpcre and grep is built without it

[Jeff King <peff@peff.net>]

On Sat, Dec 31, 2016 at 10:59:11PM -0600, A. Wilcox wrote:

> I'm attempting to package Git for our new Linux distribution and I
> have run in to a failure on our PowerPC builder while running the test
> suite.
> 
> The PowerPC builder runs a tiny version of grep(1) that was not built
> with PCRE.  As such, grep -P returns 2 and prints:
> 
> grep: support for the -P option is not compiled into this
> - --disable-perl-regexp binary
> 
> However, our Git build *does* link against libpcre.  This causes a
> tests numbered 142 and 143 to fail in t7810-grep.sh.

If we are using "grep -P" in our test suite, it should definitely be
marked with a prerequisite that is independent of the LIBPCRE one.

But I can't find any such place in our test suite. Grepping for
"grep.*-P" doesn't turn up any hits, and dropping this into my PATH as
"grep":

    #!/bin/sh

    case "$*" in
    *-P*|*perl-regex*)
      echo >&2 "Pretending not to understand -P"
      exit 1
    esac

    exec /bin/grep "$@"

doesn't break anything. We do call "git grep -P", of course, but that
should be using the internal libpcre (once upon a time we would invoke
an external grep, but that feature has been gone for years).

Can you show us the output of "./t7810-grep.sh -v -i"?

-Peff