[Buildroot] [PATCH v3 03/10] musl: build broken on Thumb, use ARM mode
Thomas Petazzoni
thomas.petazzoni at free-electrons.com
Thu Mar 31 19:00:08 UTC 2016
Building the musl C library on Thumb (Thumb1, not Thumb2), fails with:
{standard input}:20: Error: only lo regs allowed with immediate -- `mov fp,#0'
{standard input}:21: Error: only lo regs allowed with immediate -- `mov lr,#0'
{standard input}:25: Error: unshifted register required -- `and ip,a1,#-16'
Since there are no cores that we support that are Thumb1 only, use the
same solution as the one used by glibc: build the C library in ARM
mode.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>
---
package/musl/musl.mk | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/package/musl/musl.mk b/package/musl/musl.mk
index 081a700..733f940 100644
--- a/package/musl/musl.mk
+++ b/package/musl/musl.mk
@@ -23,6 +23,12 @@ MUSL_ADD_TOOLCHAIN_DEPENDENCY = NO
MUSL_INSTALL_STAGING = YES
+# Thumb build is broken, build in ARM mode, since all architectures
+# that support Thumb1 also support ARM.
+ifeq ($(BR2_ARM_INSTRUCTIONS_THUMB),y)
+MUSL_EXTRA_CFLAGS += -marm
+endif
+
define MUSL_CONFIGURE_CMDS
(cd $(@D); \
$(TARGET_CONFIGURE_OPTS) \
--
2.6.4
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