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-rw-r--r--libc/sysdeps/linux/arm/bits/arm_asm.h9
1 files changed, 8 insertions, 1 deletions
diff --git a/libc/sysdeps/linux/arm/bits/arm_asm.h b/libc/sysdeps/linux/arm/bits/arm_asm.h
index 1d87df6eb..921c9a3c9 100644
--- a/libc/sysdeps/linux/arm/bits/arm_asm.h
+++ b/libc/sysdeps/linux/arm/bits/arm_asm.h
@@ -24,5 +24,12 @@
#define THUMB1_ONLY 1
#endif
-#endif /* _ARM_ASM_H */
+#if defined(__USE_BX__)
+# if ( defined (__ARM_ARCH_2__) || defined (__ARM_ARCH_3__) \
+ || defined (__ARM_ARCH_3M__) || defined (__ARM_ARCH_4__) \
+ )
+# error Use of BX was requested, but is not available on the target processor.
+# endif /* ARCH level */
+#endif /* __USE_BX__ */
+#endif /* _ARM_ASM_H */