Hi All,

The previous testcase would fail on a system where the initial mode is thumb and later
switches to an arm mode. This would again cause some warnings to be emitted.

This patch visits all builtins defined with builtin_define_with_int_value and undefines
them if they could possibly change by changing the architecture.

The testcase has also been updated to make it fail more easily on such cases.

Bootstrapped and regtested on arm-none-Linux-gnueabihf and no issues.

Ok for trunk?

Thanks,
Tamar


gcc/
2018-02-07  Tamar Christina  <tamar.christina@arm.com>

	PR target/82641
	* config/arm/arm-c.c (arm_cpu_builtins): Un-define __ARM_FEATURE_LDREX,
	__ARM_ARCH_PROFILE, __ARM_ARCH_ISA_THUMB, __ARM_FP and __ARM_NEON_FP.

gcc/testsuite
2018-02-07  Tamar Christina  <tamar.christina@arm.com>

	PR target/82641
	* gcc.target/arm/pragma_arch_switch_2.c: Use armv6 and armv5t.

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