build: Move FTS feature check to m4 file with cache check too

This is to avoid checking for the FTS features in cross-compilation situations
where the check will fail and we've previously done the check anyway (knowing
it works). We use M4 caching for this.

1 files changed, 32 insertions, 0 deletions

diff --git a/m4/sqlite-builtin-fts4.m4 b/m4/sqlite-builtin-fts4.m4
new file mode 100644
index 000000000..acf8e5811
--- /dev/null
+++ b/m4/sqlite-builtin-fts4.m4
@@ -0,0 +1,32 @@
+AC_DEFUN([AX_SQLITE_BUILTIN_FTS4],
+[
+  AC_REQUIRE([AC_PROG_CC])
+
+  OLD_CFLAGS="$CFLAGS"
+  OLD_LIBS="$LIBS"
+  CFLAGS="$SQLITE3_CFLAGS"
+  LIBS="$SQLITE3_LIBS"
+
+  AC_CHECK_HEADERS([sqlite3.h])
+
+  AC_CACHE_CHECK([whether SQLite3 has required FTS features],
+                 [ax_cv_sqlite_builtin_fts4],
+  [
+  AC_RUN_IFELSE(
+    [AC_LANG_PROGRAM([[#include <sqlite3.h>]],
+                     [[sqlite3 *db;
+                       int rc;
+                       rc = sqlite3_open(":memory:", &db);
+                       if (rc!=SQLITE_OK) return -1;
+                       rc = sqlite3_exec(db, "create table a(text)", 0, 0, 0);
+                       if (rc!=SQLITE_OK) return -1;
+                       rc = sqlite3_exec(db, "create virtual table t using fts4(content='a',text)", 0, 0, 0);
+                       if (rc!=SQLITE_OK) return -1;]])],
+    [ax_cv_sqlite_builtin_fts4=yes],
+    [ax_cv_sqlite_builtin_fts4=no],
+    [ax_cv_sqlite_builtin_fts4=no])])
+
+  CFLAGS="$OLD_CFLAGS"
+  LIBS="$OLD_LIBS"
+])
+