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[Ada] Avoid confusing warning on exception propagation in GNATprove mode

When compiling with the restriction No_Exception_Propagation, GNAT compiler
may issue a warning about exceptions not being propagated. This warning is
useless and confusing to users for GNATprove analysis, as GNATprove
precisely detects possible exceptions, so disable the warning in that mode.

Tested on x86_64-pc-linux-gnu, committed on trunk

2018-07-17  Yannick Moy  <>


	* gnat1drv.adb (Gnat1drv): Do not issue warning about exception not
	being propagated in GNATprove mode.
--- gcc/ada/gnat1drv.adb
+++ gcc/ada/gnat1drv.adb
@@ -467,6 +467,12 @@ procedure Gnat1drv is
          Ineffective_Inline_Warnings := True;
+         --  Do not issue warnings for possible propagation of exception.
+         --  GNATprove already issues messages about possible exceptions.
+         No_Warn_On_Non_Local_Exception := True;
+         Warn_On_Non_Local_Exception := False;
          --  Disable front-end optimizations, to keep the tree as close to the
          --  source code as possible, and also to avoid inconsistencies between
          --  trees when using different optimization switches.

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