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RE: selective linking of floating point support for *printf / *scanf
- From: "Thomas Preud'homme" <thomas dot preudhomme at arm dot com>
- To: "'Joseph S. Myers'" <joseph at codesourcery dot com>, "Joey Ye" <joey dot ye dot cc at gmail dot com>
- Cc: "Grissiom" <chaos dot proton at gmail dot com>, "Eric Blake" <eblake at redhat dot com>, "Joern Rennecke" <joern dot rennecke at embecosm dot com>, "GCC" <gcc at gcc dot gnu dot org>, "Joerg Wunsch" <joerg_wunsch at uriah dot heep dot sax dot de>, <avr-libc-dev at nongnu dot org>, "Andrew Burgess" <andrew dot burgess at embecosm dot com>, <newlib at sourceware dot org>
- Date: Wed, 3 Sep 2014 14:58:30 +0800
- Subject: RE: selective linking of floating point support for *printf / *scanf
- Authentication-results: sourceware.org; auth=none
- References: <CAMqJFCpWKXVmmc-YLKf9XO6H8C_YnTEcgzkJAidE21MirJbi-w at mail dot gmail dot com> <001401cfc0f9$bdc5cbc0$39516340$ at arm dot com> <CAMqJFCrEOgavwvW25vO=S-+0TZ_xOnDa0Ex-Ff4XG329K5WE9g at mail dot gmail dot com> <001901cfc1c4$d0678630$71369290$ at arm dot com> <CAMqJFCoFC8sVRQB3+v4dzSVc5LLs9cycjm621FmM34gGHRWFng at mail dot gmail dot com> <000001cfc1e3$7f1a22f0$7d4e68d0$ at arm dot com> <CAMqJFCo1EA8TLVsv=r7gW-udiH6pqBKVuQUvHeGcFDqrnMo_EQ at mail dot gmail dot com> <000101cfc281$3a3008f0$ae901ad0$ at arm dot com> <CAMqJFCrrj1_VHmz7G-VgDpLNGjsTtdjPLqbCRY1oVxeO-BESHw at mail dot gmail dot com> <000201cfc34f$1ceadb20$56c09160$ at arm dot com> <54007E28 dot 6090106 at redhat dot com> <CALC6sNDiJ+EOjTasMj2YCQmq10mVQrZKKsaUurhjQe=Zbn435g at mail dot gmail dot com> <000401cfc40a$a22255f0$e66701d0$ at arm dot com> <CAL0py26WdXN0N-jhejLAbEjZ-Q5xT6yunr1gnmcBhvpFPaVEfw at mail dot gmail dot com> <Pine dot LNX dot 4 dot 64 dot 1409021521370 dot 27793 at digraph dot polyomino dot org dot uk>
> From: Joseph S. Myers [mailto:joseph@codesourcery.com]
> Sent: Tuesday, September 02, 2014 11:29 PM
>
> Identifiers beginning with a single underscore are reserved with file
> scope. This means an application cannot provide an external definition of
> them, because such an external definition would have file scope. So it's
> fine for the implementation to define such identifiers and use them in the
> implementation of standard functions.
Ah yes, I mistook file scope with file scope with internal linkage. So then there
shouldn't be any problem since _printf_float and _scanf_float are only used
for external linkage, no macro refer to them.
Best regards,
Thomas