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Re: extern const initialized warns in C

From: Georg-Johann Lay <avr at gjlay dot de>
To: Jay K <jayk123 at hotmail dot com>
Cc: gcc <gcc at gcc dot gnu dot org>
Date: Sun, 21 Jan 2018 13:08:04 +0100
Subject: Re: extern const initialized warns in C
Authentication-results: sourceware.org; auth=none
References: <MWHPR18MB121493D9F2292547E0AF6C3AE6ED0@MWHPR18MB1214.namprd18.prod.outlook.com> <MWHPR18MB121457D8901E94B1F0F339D6E6ED0@MWHPR18MB1214.namprd18.prod.outlook.com>

Jay K schrieb:

extern const int foo = 123;

Why does this warn?
This is a valid portable form, with the same meaning
across all compilers, and, importantly, portably
to C and C++.


I also wondered about this.

In C99 §6.9.2 "External object definitions" there's actually
the following example in clause 4:

extern int i3 = 3; // definition, external linkage

Johann

Follow-Ups:
- Re: extern const initialized warns in C
  - From: Franz Sirl
- Re: extern const initialized warns in C
  - From: Jonathan Wakely

References:
- extern const initialized warns in C
  - From: Jay K

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