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Peter Eisentraut 0869ea43e9 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 b1ef48980d,
  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 6fdd5d9563, 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
2025-01-17 09:30:42 +01:00
..
ax_pthread.m4 Update config/ax_pthread.m4 to latest upstream version. 2018-11-19 15:05:33 -05:00
c-compiler.m4 Remove useless configure check 2025-01-05 11:34:28 +01:00
c-library.m4 Simplify checking for xlocale.h 2024-10-01 07:23:45 -04:00
check_decls.m4 Fix configure's AC_CHECK_DECLS tests to work correctly with clang. 2018-11-19 12:01:47 -05:00
check_modules.pl Update copyright for 2025 2025-01-01 11:21:55 -05:00
config.guess Update config.guess and config.sub 2024-04-09 14:21:57 +02:00
config.sub Update config.guess and config.sub 2024-04-09 14:21:57 +02:00
general.m4 Rename configure.in to configure.ac 2020-07-24 10:42:08 +02:00
install-sh
llvm.m4 jit: Require at least LLVM 14, if enabled. 2024-10-01 04:49:11 -04:00
Makefile Install our "missing" script where PGXS builds can find it. 2015-12-11 16:15:05 -05:00
meson.build meson: Add initial version of meson based build system 2022-09-21 22:37:17 -07:00
missing
perl.m4 Remove MSVC scripts 2023-12-20 09:44:37 +09:00
pkg.m4 Fix collection of typos in the code and the documentation 2022-03-15 11:29:35 +09:00
prep_buildtree Fix vpath build 2019-03-27 23:36:00 +01:00
programs.m4 Remove flex version checks 2025-01-17 09:30:42 +01:00
python.m4 Unify DLSUFFIX on Darwin 2022-07-06 07:41:33 +02:00
tcl.m4 configure: More use of AC_ARG_VAR 2019-01-18 08:38:34 +01:00