[Nano-devel] [PATCH] configure: ignore REG_ENHANCED test when we use gnulib

[Mike Frysinger]

If we're using the bundled gnulib regex module, then assume REG_ENHANCED
is not supported (since gnulib doesn't support it).

This fixes https://savannah.gnu.org/bugs/?50714.
---
 configure.ac | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/configure.ac b/configure.ac
index f914fa8e70f4..c839c5eca29d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -594,10 +594,19 @@ AC_CACHE_CHECK([for enhanced regular expression flag], 
nano_cv_flag_reg_extended
                                                     error: No REG_ENHANCED 
support!
                                                     #endif
                                                   ]])],
-                                 [nano_cv_flag_reg_extended="REG_EXTENDED | 
REG_ENHANCED"],
-                                 [nano_cv_flag_reg_extended="REG_EXTENDED"])])
+                                 [nano_cv_flag_reg_extended=yes],
+                                 [nano_cv_flag_reg_extended=no])])
+dnl The bundled gnulib regex module doesn't support REG_ENHANCED.
+if test "$ac_use_included_regex" = "yes"; then
+    nano_cv_flag_reg_extended="no"
+fi
+if test "$nano_cv_flag_reg_extended" = "yes"; then
+    nano_reg_extended="REG_EXTENDED | REG_ENHANCED"
+else
+    nano_reg_extended="REG_EXTENDED"
+fi
 
-AC_DEFINE_UNQUOTED(NANO_REG_EXTENDED, $nano_cv_flag_reg_extended,
+AC_DEFINE_UNQUOTED(NANO_REG_EXTENDED, $nano_reg_extended,
                   [Flag(s) to use to get the full range of extended regular 
expressions])
 
 # Check for word-boundary support (/< and />).
-- 
2.12.0