[Ada] Fix potential Constraint_Error if Library_Version is too long

2018-07-31  Arnaud Charlet  <charlet@adacore.com>

gcc/ada/

	* gnatlink.adb: Fix potential Constraint_Error if
	Library_Version is too long.

From-SVN: r263107

diff --git a/gcc/ada/ChangeLog b/gcc/ada/ChangeLog
index 92ec751..ba9599e 100644 (file)
--- a/gcc/ada/ChangeLog
+++ b/gcc/ada/ChangeLog
@@ -1,5 +1,10 @@
 2018-07-31  Arnaud Charlet  <charlet@adacore.com>
 
+       * gnatlink.adb: Fix potential Constraint_Error if
+       Library_Version is too long.
+
+2018-07-31  Arnaud Charlet  <charlet@adacore.com>
+
        * sem_elab.adb: Remove duplicate condition detected by CodePeer.
 
 2018-07-31  Ed Schonberg  <schonberg@adacore.com>

diff --git a/gcc/ada/gnatlink.adb b/gcc/ada/gnatlink.adb
index f712a7a..16981b8 100644 (file)
--- a/gcc/ada/gnatlink.adb
+++ b/gcc/ada/gnatlink.adb
@@ -1102,8 +1102,10 @@ procedure Gnatlink is
                   --  We will be looking for the static version of the library
                   --  as it is in the same directory as the shared version.
 
-                  if Next_Line (Nlast - Library_Version'Length + 1 .. Nlast) =
-                       Library_Version
+                  if Nlast >= Library_Version'Length
+                    and then Next_Line
+                      (Nlast - Library_Version'Length + 1 .. Nlast)
+                        = Library_Version
                   then
                      --  Set Last to point to last character before the
                      --  library version.