Upgrade embedded version of Flocq to 3.1.

Main changes to CompCert outside of Flocq are as follows:

- Minimal supported version of Coq is now 8.7, due to Flocq requirements.

- Most modifications are due to Z2R being dropped in favor of IZR and to
  the way Flocq now handles NaNs.

- CompCert now correctly handles NaNs for the Risc-V architecture
  (hopefully).

1 files changed, 2 insertions, 2 deletions

diff --git a/configure b/configure
index db2556a0..bb4ef1a6 100755
--- a/configure
+++ b/configure
@@ -503,14 +503,14 @@ missingtools=false
 echo "Testing Coq... " | tr -d '\n'
 coq_ver=$(${COQBIN}coqc -v 2>/dev/null | sed -n -e 's/The Coq Proof Assistant, version \([^ ]*\).*$/\1/p')
 case "$coq_ver" in
-  8.6.1|8.7.0|8.7.1|8.7.2|8.8.0|8.8.1|8.8.2|8.9.0)
+  8.7.0|8.7.1|8.7.2|8.8.0|8.8.1|8.8.2|8.9.0)
         echo "version $coq_ver -- good!";;
   ?*)
         echo "version $coq_ver -- UNSUPPORTED"
         if $ignore_coq_version; then
             echo "Warning: this version of Coq is unsupported, proceed at your own risks."
         else
-            echo "Error: CompCert requires one of the following Coq versions: 8.9.0, 8.8.2, 8.8.1, 8.8.0, 8.7.2, 8.7.1, 8.7.0, 8.6.1"
+            echo "Error: CompCert requires one of the following Coq versions: 8.9.0, 8.8.2, 8.8.1, 8.8.0, 8.7.2, 8.7.1, 8.7.0"
             missingtools=true
         fi;;
   "")