configure: Fix C99 vsnprintf check for stricter C99 compilers

NagiosEnterprises / nagioscore

Nagios Core

GNU General Public License v2.0

1.53k stars 445 forks source link

configure: Fix C99 vsnprintf check for stricter C99 compilers #890

Closed fweimer-rh closed 1 year ago

fweimer-rh commented 1 year ago

Add additional header includes for more function prototypes, and declare int as returning main. This avoids implicit function declarations and implicit int types, language features not actually part of C99.

Related to:

https://fedoraproject.org/wiki/Changes/PortingToModernC
https://fedoraproject.org/wiki/Toolchain/PortingToModernC

sawolf commented 1 year ago

Hi Florian, thanks for the patch - your changes will be merged shortly!