[resending due to wrong @bugs address in last copy, sorry]
On Wed, Jul 09, 2014 at 09:50:08AM +0200, Wouter Verhelst wrote:
> Package: autoconf
> Version: 2.69-7
> Severity: normal
>
> Hi,
>
> The nbd configure.ac contains:
>
> AC_PROG_CC_C99
>
> because I use a number of C99 constructs in the code. When, however, I
> run configure like so:
>
> ./configure CFLAGS='-g -O0 -Wall -Werror'
>
> because I want to clean up the code a bit, I get an error message at
> compile time:
>
> nbdsrv.c: In function 'getmaskbyte':
> nbdsrv.c:116:2: error: 'for' loop initial declarations are only allowed in
> C99 or C11 mode
> for(int i = 7; i + masklen > 7; i--) {
> ^
>
> which is surprising, since I asked for C99 mode. If I specify CFLAGS so
> it also contains '-std=gnu99', then everything compiles cleanly (apart
> from the bits that are caused by the -Wall -Werror, that is).
Specifying -Werror in CFLAGS to configure is almost always a mistake.
It screws up Autoconf tests, because some Autoconf tests unavoidably
provoke warnings. Remove -Werror and you'll get better results.
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