Hi Thomas,

Just for my understanding:

* Does IAR provide a C std. lib as part of IAR toolchain package? * How the std C lib linked to the image? Does user provide an explicit flag which std. C lib to linked to the image?

Tamas

From: TF-M tf-m-bounces@lists.trustedfirmware.org On Behalf Of Thomas Törnblom via TF-M Sent: 08 January 2020 12:45 To: tf-m@lists.trustedfirmware.org Subject: Re: [TF-M] [Request For Comments] apply "-fno-builtin" as default compiler flags

The IAR toolchain does not produce any special "builtin" calls and thus does not have any flag similar to "-fno-builtin".

/Thomas Den 2020-01-08 kl. 03:53, skrev Ken Liu via TF-M: Hi, � As TF-M needs runtime APIs so we are creating the Secure Partition runtime library, code is ready but we have not forwarded all necessary runtime APIs to the version TF-M implemented, this was caused by the toolchain optimization for built-in APIs, such as: � - Forward printf(%s) to puts if there is only one string parameter. - ARMCLANG would forward memxxx API into an optimized variant. � With the '-fno-builtin' flags set in the toolchain, this optimization would be disabled so that user just implement the same name built-in to replace the toolchain version. � Please help to check these point before applying '-fno-builtin' and provide your feedback: � - Could toolchains out of ARMCLANG and GNUARM have a similar flag? - Would it affect your project setting and how does it affect? � Please help to feedback. I will keep this thread open for ~1 week and let's get a conclusion after this. � Thanks! � /Ken

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