interrupts: safeguard isr_wrapper and isr_install

ld linker will only resolve undefined symbols inside functions that is
actually being called.

However, not all linkers behaves this way. Certain linkers, for example
armlink, resolves all undefined symbols even if during a later stage at
the linking the function will be pruned.

Therefore `ifdef CONFIG_GEN_ISR_TABLES` has been placed to safeguard
functions that will call undefined symbols when CONFIG_GEN_ISR_TABLES=y.

Signed-off-by: Torsten Rasmussen <Torsten.Rasmussen@nordicsemi.no>

arch/arm/core/aarch32/cortex_m/vector_table.h

@@ -51,7 +51,9 @@ GTEXT(z_arm_pendsv)
 GTEXT(z_arm_exc_spurious)
 
 GTEXT(z_arm_prep_c)
+#if defined(CONFIG_GEN_ISR_TABLES)
 GTEXT(_isr_wrapper)
+#endif /* CONFIG_GEN_ISR_TABLES */
 
 #else /* _ASMLANGUAGE */
 

arch/arm/core/aarch32/irq_manage.c

@@ -291,6 +291,7 @@ void irq_target_state_set_all_non_secure(void)
 #endif /* CONFIG_ARM_SECURE_FIRMWARE */
 
 #ifdef CONFIG_DYNAMIC_INTERRUPTS
+#ifdef CONFIG_GEN_ISR_TABLES
 int arch_irq_connect_dynamic(unsigned int irq, unsigned int priority,
 			     void (*routine)(const void *parameter),
 			     const void *parameter, uint32_t flags)
@@ -299,6 +300,7 @@ int arch_irq_connect_dynamic(unsigned int irq, unsigned int priority,
 	z_arm_irq_priority_set(irq, priority, flags);
 	return irq;
 }
+#endif /* CONFIG_GEN_ISR_TABLES */
 
 #ifdef CONFIG_DYNAMIC_DIRECT_INTERRUPTS
 static inline void z_arm_irq_dynamic_direct_isr_dispatch(void)