From ba4179bb66ad2dabc385de4584e7b57c9bffb347 Mon Sep 17 00:00:00 2001
From: dubiousjim <dubiousjim@gmail.com>
Date: Thu, 20 Mar 2025 05:55:55 -0400
Subject: [PATCH] py/dynruntime.mk: Fix use of musl's libm.a when
 LINK_RUNTIME=1.

Like PICOLIBC, MUSL also has its math functions in libc.a.  There is a
libm.a, but it's empty.

Signed-off-by: dubiousjim <dubiousjim@gmail.com>
---
 py/dynruntime.mk | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/py/dynruntime.mk b/py/dynruntime.mk
index 807befb46..1ef521bd9 100644
--- a/py/dynruntime.mk
+++ b/py/dynruntime.mk
@@ -124,6 +124,10 @@ else
 $(error architecture '$(ARCH)' not supported)
 endif
 
+ifneq ($(findstring -musl,$(shell $(CROSS)gcc -dumpmachine)),)
+USE_MUSL := 1
+endif
+
 MICROPY_FLOAT_IMPL_UPPER = $(shell echo $(MICROPY_FLOAT_IMPL) | tr '[:lower:]' '[:upper:]')
 CFLAGS += $(CFLAGS_ARCH) -DMICROPY_FLOAT_IMPL=MICROPY_FLOAT_IMPL_$(MICROPY_FLOAT_IMPL_UPPER)
 
@@ -147,6 +151,8 @@ ifeq ($(LINK_RUNTIME),1)
 # distribution.
 ifeq ($(USE_PICOLIBC),1)
 LIBM_NAME := libc.a
+else ifeq ($(USE_MUSL),1)
+LIBM_NAME := libc.a
 else
 LIBM_NAME := libm.a
 endif