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musl: build broken on Thumb, use ARM mode

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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@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This commit is contained in:
Thomas Petazzoni 2016-03-31 21:00:08 +02:00 committed by Peter Korsgaard
parent 696db77484
commit 97fd876f62
1 changed files with 6 additions and 0 deletions
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6
package/musl/musl.mk
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@ -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) \