Bug#990199: gcc: Icorrect warning report "implicit declaration of function ‘popen’"

[Rick Stanley <rick@scotsgeek.com>]

Package: gcc
Version: 4:10.2.1-1
Severity: normal
X-Debbugs-Cc: rick@scotsgeek.com

Dear Maintainer,

*** Reporter, please consider answering these questions, where appropriate ***

   * What led up to the situation?
#include <stdio.h>

int main(void)
{
   popen("ls -la", "r");

   return 0;
}

-std=c89, c90, compiles cleanly
-std=c99, c11, c18 compiles but reports:
   * What exactly did you do (or not do) that was effective (or
     ineffective)?
change of -std option causes or prevents this warning
   * What was the outcome of this action?
   * What outcome did you expect instead?
No warning should be reported with any -std option.  declaration found in stdio.h, and function linked


*** End of the template - remove these template lines ***


-- System Information:
Debian Release: 11.0
  APT prefers testing-security
  APT policy: (500, 'testing-security'), (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 5.10.0-7-amd64 (SMP w/4 CPU threads)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages gcc depends on:
ii  cpp     4:10.2.1-1
ii  gcc-10  10.2.1-6

Versions of packages gcc recommends:
ii  libc6-dev [libc-dev]  2.31-12

Versions of packages gcc suggests:
pn  autoconf           <none>
pn  automake           <none>
pn  bison              <none>
pn  flex               <none>
pn  gcc-doc            <none>
pn  gcc-multilib       <none>
ii  gdb-minimal [gdb]  10.1-1.7
pn  libtool            <none>
ii  make               4.3-4.1
ii  manpages-dev       5.10-1

-- no debconf information