Remove support for v1 of the PCRE library

Remove support for using version 1 of the PCRE library. Its use has
been discouraged by upstream for a long time, and it's in a
bugfix-only state.

Anyone who was relying on v1 in particular got a nudge to move to v2
in e6c531b808 (Makefile: make USE_LIBPCRE=YesPlease mean v2, not v1,
2018-03-11), which was first released as part of v2.18.0.

With this the LIBPCRE2 test prerequisites is redundant to PCRE. But
I'm keeping it for self-documentation purposes, and to avoid conflict
with other in-flight PCRE patches.

I'm also not changing all of our own "pcre2" names to "pcre", i.e. the
inverse of 6d4b5747f0 (grep: change internal *pcre* variable &
function names to be *pcre1*, 2017-05-25). I don't see the point, and
it makes the history/blame harder to read. Maybe if there's ever a
PCRE v3...

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 0 insertions, 12 deletions

diff --git a/t/README b/t/README
index c730a70770..5398994eba 100644
--- a/t/README
+++ b/t/README
@@ -1104,18 +1104,6 @@ use these, and "test_set_prereq" for how to define your own.
    Git was compiled with support for PCRE. Wrap any tests
    that use git-grep --perl-regexp or git-grep -P in these.
 
- - LIBPCRE1
-
-   Git was compiled with PCRE v1 support via
-   USE_LIBPCRE1=YesPlease. Wrap any PCRE using tests that for some
-   reason need v1 of the PCRE library instead of v2 in these.
-
- - LIBPCRE2
-
-   Git was compiled with PCRE v2 support via
-   USE_LIBPCRE2=YesPlease. Wrap any PCRE using tests that for some
-   reason need v2 of the PCRE library instead of v1 in these.
-
  - CASE_INSENSITIVE_FS
 
    Test is run on a case insensitive file system.