From: Michael Paquier <michael@paquier.xyz>
Date: Mon, 3 Jul 2023 22:25:34 +0000 (+0900)
Subject: Show information about flex (version and command path) in meson output
X-Git-Url: http://git.postgresql.org/gitweb/-?a=commitdiff_plain;h=72df1d3f1b9d39373edfa8ceed21a000a3cba66f;p=users%2Frhaas%2Fpostgres.git

Show information about flex (version and command path) in meson output

Like bison, this is useful to know which version and command of flex are
detected by meson.  For example, this was useful for me when using
win_flex.exe on Windows.

Reviewed-by: Peter Eisentraut
Discussion: https://postgr.es/m/ZDT3FbmrjBuBthmR@paquier.xyz
---

diff --git a/meson.build b/meson.build
index aaa9daf266..3ea4b0d72a 100644
--- a/meson.build
+++ b/meson.build
@@ -361,6 +361,10 @@ bison_kw = {
 }
 
 flex_flags = []
+if flex.found()
+  flex_version_c = run_command(flex, '--version', check: true)
+  flex_version = flex_version_c.stdout().split(' ')[1].split('\n')[0]
+endif
 flex_wrapper = files('src/tools/pgflex')
 flex_cmd = [python, flex_wrapper,
   '--builddir', '@BUILD_ROOT@',
@@ -3370,6 +3374,7 @@ if meson.version().version_compare('>=0.57')
     {
       'bison': '@0@ @1@'.format(bison.full_path(), bison_version),
       'dtrace': dtrace,
+      'flex': '@0@ @1@'.format(flex.full_path(), flex_version),
     },
     section: 'Programs',
   )