Bug#990199: Please delete
Please delete this report completely. Thank you!
Bug#990199: Missing information
-std=c99, c11, c18 compiles but reports: "warning: implicit declaration of function ‘popen’; did you mean ‘fopen’? [-Wimplicit-function-declaration]" -- RSI (Rick Stanley, Inc.) (917) 822-7771 www.rsiny.com Computer Systems Consulting Linux & Open Source Specialists
Bug#990199: Missing information
Warning incorrectly reported: "warning: implicit declaration of function ‘popen’; did you mean ‘fopen’? [-Wimplicit-function-declaration]"
Bug#990199: gcc: Icorrect warning report "implicit declaration of function ‘popen’"
Package: gcc
Version: 4:10.2.1-1
Severity: normal
X-Debbugs-Cc: r...@scotsgeek.com
Dear Maintainer,
*** Reporter, please consider answering these questions, where appropriate ***
* What led up to the situation?
#include
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
pn automake
pn bison
pn flex
pn gcc-doc
pn gcc-multilib
ii gdb-minimal [gdb] 10.1-1.7
pn libtool
ii make 4.3-4.1
ii manpages-dev 5.10-1
-- no debconf information
Bug#966194: Cancel report!
Please cancel and delete this entire report. This was a valgrind issue. Sorry for bothering you. Thank you! Rick Stanley -- RSI (Rick Stanley, Inc.) (917) 822-7771 www.rsiny.com Computer Systems Consulting Linux & Open Source Specialists
Bug#966194: Wrong code in the report
Correct code that created the error message in valgrind:
#include
#include
#include
#define DIM 32
int main(void)
{
char *p = NULL;
p = malloc(DIM);
if(p == NULL)
{
printf("Allocation error.\n");
exit(1);
}
strcpy(p, "This is a test.");
for(int x = 0 ; x < DIM; ++x)
{
printf("%02x ", p[x]);
}
putchar('\n');
free(p);
return 0;
}
Bug#966194: gcc-9: valgrind error: Conditional jump or move depends on uninitialised value(s)
Package: gcc-9
Version: 9.3.0-15
Severity: important
X-Debbugs-Cc: r...@scotsgeek.com
Dear Maintainer,
Source:
#include
#include
#define DIM 32
char p[DIM] = "NULL";
int main(void)
{
strcpy(p, "This is a test.");
for(int x = 0 ; x < DIM; ++x)
{
printf("%02x ", p[x]);
}
putchar('\n');
return 0;
}
valgrind output:
==16291== Use of uninitialised value of size 8
==16291==at 0x48B4E5A: _itoa_word (_itoa.c:180)
==16291==by 0x48CE753: __vfprintf_internal (vfprintf-internal.c:1687)
==16291==by 0x48BAD6A: printf (printf.c:33)
==16291==by 0x10920D: main (ptest.c:33)
==16291==
==16291== Conditional jump or move depends on uninitialised value(s)
==16291==at 0x48B4E6C: _itoa_word (_itoa.c:180)
==16291==by 0x48CE753: __vfprintf_internal (vfprintf-internal.c:1687)
==16291==by 0x48BAD6A: printf (printf.c:33)
==16291==by 0x10920D: main (ptest.c:33)
==16291==
...
==16291== ERROR SUMMARY: 64 errors from 4 contexts (suppressed: 0 from 0)
Error only occurs with heap allocation, not with global or local arrays.
Error did not occur with previous versions of gcc. Compilation command has not
changed.
"gcc -std=c18 -Wall -Wextra -Wpedantic -g -I . -o ptest ptest.c"
Error should not occur with the code posted here.
-- System Information:
Debian Release: bullseye/sid
APT prefers testing
APT policy: (500, 'testing')
Architecture: amd64 (x86_64)
Kernel: Linux 5.7.0-1-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-9 depends on:
ii binutils 2.34.90.20200706-1
ii cpp-9 9.3.0-15
ii gcc-9-base9.3.0-15
ii libc6 2.31-1
ii libcc1-0 10.1.0-6
ii libgcc-9-dev 9.3.0-15
ii libgcc-s1 10.1.0-6
ii libgmp10 2:6.2.0+dfsg-6
ii libisl22 0.22.1-1
ii libmpc3 1.1.0-1
ii libmpfr6 4.0.2-1
ii libstdc++610.1.0-6
ii zlib1g1:1.2.11.dfsg-2
Versions of packages gcc-9 recommends:
ii libc6-dev 2.31-1
Versions of packages gcc-9 suggests:
pn gcc-9-doc
pn gcc-9-locales
pn gcc-9-multilib
-- no debconf information
