From 321146d5d68915e35355b4bd87e660300a948c4c Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Sat, 13 Nov 2021 11:44:34 +0100
Subject: configure: better diagnostics if hyper is built wrong

If hyper is indeed present in the specified directory but couldn't be
used to find the correct symbol, then offer a different error message to
better help the user understand the issue.

Sugggested-by: Jacob Hoffman-Andrews
Fixes #8001
---
 configure.ac | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 2834b3d32..63e320236 100644
--- a/configure.ac
+++ b/configure.ac
@@ -703,7 +703,8 @@ if test X"$want_hyper" != Xno; then
     LIBS="$LIB_HYPER $LIBS"
 
     if test "x$cross_compiling" != "xyes"; then
-      DIR_HYPER=`echo $LD_HYPER | $SED -e 's/^-L//'`
+      dnl remove -L, separate with colon if more than one
+      DIR_HYPER=`echo $LD_HYPER | $SED -e 's/^-L//' -e 's/ -L/:/g'`
     fi
 
     AC_CHECK_LIB(hyper, hyper_io_new,
@@ -721,6 +722,11 @@ if test X"$want_hyper" != Xno; then
           AC_MSG_NOTICE([Added $DIR_HYPER to CURL_LIBRARY_PATH]),
        )
       ],
+      for d in `echo $DIR_HYPER | sed -e 's/:/ /'`; do
+        if test -f "$d/libhyper.a"; then
+          AC_MSG_ERROR([hyper was found in $d but was probably built with wrong flags. See docs/HYPER.md.])
+        fi
+      done
       AC_MSG_ERROR([--with-hyper but hyper was not found. See docs/HYPER.md.])
     )
   fi
-- 
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