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[2/3] arm: Add missing multilib default values

Message ID 20250325235118.245231-3-keithp@keithp.com
State New
Headers show
Series Automate use of -Os/-Oz as multilib selector | expand

Commit Message

Keith Packard March 25, 2025, 11:51 p.m. UTC 
The arm multilib configuration includes two more parameters which
affect multilib selection, marm/mthumb and mfloat-abi. Without those,
the default multilib selection is mis-specified and the only reason it
works is because '.' is the fall-back path.

Add "marm" and "mfloat-abi=soft" to MULTILIB_DEFAULTS to actually
match when the compiler is run without any target parameters.

This hasn't caused any problems in practice because there are no
non-default multilib options which can be applied to the default
-march target as it has neither an FPU nor any branch protection
support. Specifying another cpu or architecture always sets -marm and
-mfloat-abi and so those multilib configuration don't rely on the
defaults.

Signed-off-by: Keith Packard <keithp@keithp.com>
---
 gcc/config/arm/arm-mlib.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/gcc/config/arm/arm-mlib.h b/gcc/config/arm/arm-mlib.h
index 211f222f00d..a8b673bda31 100644
--- a/gcc/config/arm/arm-mlib.h
+++ b/gcc/config/arm/arm-mlib.h
@@ -19,4 +19,4 @@ 
    along with GCC; see the file COPYING3.  If not see
    <http://www.gnu.org/licenses/>.  */
 
-#define MULTILIB_DEFAULTS { "mbranch-protection=none" }
+#define MULTILIB_DEFAULTS { "mbranch-protection=none", "marm", "mfloat-abi=soft", }