Public bug reported:
lsb_release -rd
Description: Ubuntu 14.04.1 LTS
Release: 14.04
gcc --version
gcc (Ubuntu 4.8.2-19ubuntu1) 4.8.2
...
Trying to run a recent glibc testsuite (from glibc trunk) results in
testsuite errors because the compiler is overriding the -Wno-format
option on the command line. Running the compiler with -v shows that it
is appending an additional -Wformat after the user option and that there
is no obvious way to override this behaviour. This is a bug.
#include <stdio.h>
int f()
{
int n;
return scanf ("%llllld", &n);
}
The above testcase should compile when compiled with -Wall -Werror -Wno-
format, but instead generates errors for the unrecognized format
specifier (note that this is a deliberate part of the test).
gcc -v -Wall -Werror -Wno-format /tmp/test.c -c -o /tmp/test.o
Using built-in specs.
COLLECT_GCC=gcc
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 4.8.2-19ubuntu1'
--with-bugurl=file:///usr/share/doc/gcc-4.8/README.Bugs
--enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.8 --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--with-gxx-include-dir=/usr/include/c++/4.8 --libdir=/usr/lib --enable-nls
--with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --enable-gnu-unique-object --disable-libmudflap
--enable-plugin --with-system-zlib --disable-browser-plugin
--enable-java-awt=gtk --enable-gtk-cairo
--with-java-home=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64/jre --enable-java-home
--with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64
--with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.8-amd64
--with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar
--enable-objc-gc --enable-multiarch --disable-werror --with-arch-32=i686
--with-abi=m64 --with-multilib-list=m32,m64,mx32 --with-tune=generic
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu
Thread model: posix
gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1)
COLLECT_GCC_OPTIONS='-v' '-Wall' '-Werror' '-Wformat=0' '-c' '-o' '/tmp/test.o'
'-mtune=generic' '-march=x86-64'
/usr/lib/gcc/x86_64-linux-gnu/4.8/cc1 -quiet -v -imultiarch x86_64-linux-gnu
/tmp/test.c -quiet -dumpbase test.c -mtune=generic -march=x86-64 -auxbase-strip
/tmp/test.o -Wall -Werror -Wformat=0 -version -fstack-protector -Wformat
-Wformat-security -o /tmp/ccGaCxtC.s
GNU C (Ubuntu 4.8.2-19ubuntu1) version 4.8.2 (x86_64-linux-gnu)
compiled by GNU C version 4.8.2, GMP version 5.1.3, MPFR version
3.1.2-p3, MPC version 1.0.1
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
ignoring nonexistent directory
"/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../x86_64-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/lib/gcc/x86_64-linux-gnu/4.8/include
/usr/local/include
/usr/lib/gcc/x86_64-linux-gnu/4.8/include-fixed
/usr/include/x86_64-linux-gnu
/usr/include
End of search list.
GNU C (Ubuntu 4.8.2-19ubuntu1) version 4.8.2 (x86_64-linux-gnu)
compiled by GNU C version 4.8.2, GMP version 5.1.3, MPFR version
3.1.2-p3, MPC version 1.0.1
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: dc75e0628c9356affcec059d0c81cc01
/tmp/test.c: In function ‘f’:
/tmp/test.c:6:3: error: unknown conversion type character ‘l’ in format
[-Werror=format=]
return scanf ("%llllld", &n);
^
/tmp/test.c:6:3: error: too many arguments for format
[-Werror=format-extra-args]
cc1: all warnings being treated as errors
** Affects: gcc-4.8 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1401836
Title:
-Wno-format ignored in Ubuntu 14.04 release
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