[tracker] build: Mandate that sqlite3 >= 3.20.0 has fts5 builtin

[Carlos Garnacho <carlosg src gnome org>]

commit 84c8cc2590f18bfd6c1b3e633b84622d193061a1
Author: Carlos Garnacho <carlosg gnome org>
Date:   Mon Aug 21 22:04:28 2017 +0200

    build: Mandate that sqlite3 >= 3.20.0 has fts5 builtin
    
    That sqlite3 version brought incompatibilities in the fts5 interface,
    fts5 modules generated from < 3.20.0 trees won't work with sqlite3
    >= 3.20.0, and viceversa.
    
    Since it's not feasible nor desirable to include an additional fts5
    module copy nor an embedded sqlite3 amalgamation copy, mandate that
    SQLite was compiled with --enable-fts5 if >= 3.20.0 is found.
    
    The current copy of the fts5 module is kept around for sqlite3 < 3.20.0,
    so we don't make this a mandatory requirement for earlier versions.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=785883

 configure.ac |    7 +++++++
 meson.build  |    4 ++++
 2 files changed, 11 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 1478313..8761d19 100644
--- a/configure.ac
+++ b/configure.ac
@@ -621,6 +621,13 @@ if test "x$have_tracker_fts" = "xyes"; then
    else
       have_builtin_fts5="no"
 
+      # Sqlite 3.20 broke compatibility of the fts5 module both ways, demand
+      # that it's builtin into sqlite from that version on.
+      PKG_CHECK_EXISTS([sqlite3 >= 3.20.0], sqlite_builtin_fts5_forced=yes, sqlite_builtin_fts5_forced=no)
+      if test "x$sqlite_builtin_fts5_forced" == "xyes"; then
+        AC_MSG_ERROR([sqlite3 >= 3.20.0 must be compiled with --enable-fts5])
+      fi
+
       # Make sure SQLite has extension loading enabled
       AX_SQLITE_AUTO_EXTENSION
       if test "x$ax_cv_sqlite_auto_extension" != "xyes"; then
diff --git a/meson.build b/meson.build
index 60e14eb..8f66e72 100644
--- a/meson.build
+++ b/meson.build
@@ -115,6 +115,10 @@ if enable_fts
 
   sqlite3_has_builtin_fts5 = cc.compiles(sqlite3_builtin_fts5_test,
     name: 'sqlite3 has builtin FTS5 module')
+
+  if not sqlite3_has_builtin_fts5 and sqlite.version() >= '3.20.0'
+    error('sqlite3 >= 3.20.0 must be compiled with --enable-fts5')
+  endif
 endif
 
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