* [Ada] Accept compilation switches -Og/-Ofast in non-GCC backends
@ 2019-07-05 8:48 Pierre-Marie de Rodat
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From: Pierre-Marie de Rodat @ 2019-07-05 8:48 UTC (permalink / raw)
To: gcc-patches; +Cc: Yannick Moy
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Tools like GNATprove built as GNAT backends rely on adabkend.adb to
handle generic switches like the optimisation switches -Oxxx.
This patch adds support for -Og and -Ofast that was missing.
There is no impact on compilation.
Tested on x86_64-pc-linux-gnu, committed on trunk
2019-07-05 Yannick Moy <moy@adacore.com>
gcc/ada/
* adabkend.adb (Scan_Back_End_Switches): Accept -Og and -Ofast
switches.
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--- gcc/ada/adabkend.adb
+++ gcc/ada/adabkend.adb
@@ -117,9 +117,11 @@ package body Adabkend is
-- Set optimization indicators appropriately. In gcc-based GNAT this
-- is picked up from imported variables set by the gcc driver, but
- -- for compilers with non-gcc back ends we do it here to allow use
- -- of these switches by the front end. Allowed optimization switches
- -- are -Os (optimize for size), -O[0123], and -O (same as -O1).
+ -- for compilers with non-gcc back ends we do it here to allow use of
+ -- these switches by the front end. Allowed optimization switches are
+ -- -Os (optimize for size), -O[0123], -O (same as -O1), -Ofast
+ -- (disregard strict standards compliance), and -Og (optimize
+ -- debugging experience).
elsif Switch_Chars (First) = 'O' then
if First = Last then
@@ -134,10 +136,21 @@ package body Adabkend is
Optimization_Level :=
Character'Pos (Switch_Chars (Last)) - Character'Pos ('0');
+ -- Switch -Og is between -O0 and -O1 in GCC. Consider it like
+ -- -O0 for other back ends.
+
+ elsif Switch_Chars (Last) = 'g' then
+ Optimization_Level := 0;
+
else
Fail ("invalid switch: " & Switch_Chars);
end if;
+ -- Switch -Ofast enables -O3
+
+ elsif Switch_Chars (First + 1 .. Last) = "fast" then
+ Optimization_Level := 3;
+
else
Fail ("invalid switch: " & Switch_Chars);
end if;
@@ -169,7 +182,7 @@ package body Adabkend is
return;
- -- Special check, the back end switch -fno-inline also sets the
+ -- Special check, the back-end switch -fno-inline also sets the
-- front end flags to entirely inhibit all inlining. So we store it
-- and set the appropriate flags.
@@ -206,7 +219,7 @@ package body Adabkend is
end case;
end if;
- -- Ignore all other back end switches
+ -- Ignore all other back-end switches
elsif Is_Back_End_Switch (Switch_Chars) then
null;
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2019-07-05 8:48 [Ada] Accept compilation switches -Og/-Ofast in non-GCC backends Pierre-Marie de Rodat
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