Hi Tamas,
IAR provides C libraries in various configurations, depending on optimization levels, target types, needed features.
Normally the linker selects the appropriate libraries depending on target, optimization, semihosting etc, but it can be told to not do that, in case there is a need to provide non-standard libraries.
Cheers, /Thomas
Den 2020-01-09 kl. 09:41, skrev Tamas Ban via TF-M:
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--
*Thomas T�rnblom*, /Product Engineer/ IAR Systems AB Box 23051, Strandbodgatan 1 SE-750 23 Uppsala, SWEDEN Mobile: +46 76 180 17 80 Fax: +46 18 16 78 01 E-mail: thomas.tornblom@iar.com mailto:thomas.tornblom@iar.comWebsite: www.iar.com http://www.iar.com Twitter: www.twitter.com/iarsystems http://www.twitter.com/iarsystems
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