From 0869ea43e9c2257819e5c8719e28fe3b5c527911 Mon Sep 17 00:00:00 2001
From: Peter Eisentraut
Date: Fri, 17 Jan 2025 08:35:52 +0100
Subject: Remove flex version checks

Remove the flex version checks from configure and meson.  The cutoff
versions are all so ancient that this is no longer relevant, and what
the actual cutoff should be is a bit fuzzy.

This also removes the ancient behavior that configure would also
accept a "lex" program if it is actuall flex.  This aligns the check
with meson in this respect.

For future reference, as of this commit, these are relevant flex
versions:

- The hard required minimum is flex 2.5.34 as of commit b1ef48980dd,
  but this has not actually been tested.

- Prior to this, the minimum enforced by configure/meson was flex
  2.5.35, which is the oldest present in the buildfarm right now.

- As of commit 6fdd5d95634, the oldest version that will compile
  without warnings due to flex-generated code is flex 2.5.36.

- The oldest version that probably still has some practical relevance
  is flex 2.5.37, which ships with CentOS/RHEL 7.

Discussion: https://www.postgresql.org/message-id/1a204ccd-7ae6-478c-a431-407b5c48ccc6@eisentraut.org
---
 src/backend/utils/misc/guc-file.l | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/backend/utils/misc/guc-file.l b/src/backend/utils/misc/guc-file.l
index c0ecb8b2ce2..11a1e2a3f9f 100644
--- a/src/backend/utils/misc/guc-file.l
+++ b/src/backend/utils/misc/guc-file.l
@@ -302,7 +302,7 @@ record_config_file_error(const char *errmsg,
 /*
  * Flex fatal errors bring us here.  Stash the error message and jump back to
  * ParseConfigFp().  Assume all msg arguments point to string constants; this
- * holds for flex 2.5.35 (earliest we support). Otherwise, we would need to
+ * holds for all currently known flex versions. Otherwise, we would need to
  * copy the message.
  *
  * We return "int" since this takes the place of calls to fprintf().
-- 
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