https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96747
Bug ID: 96747
Summary: -Wshadow accepts included extern variable shadowing
Product: gcc
Version: 10.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: matous-dev at criptext dot com
Target Milestone: ---
Created attachment 49098
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=49098&action=edit
-save-temps *.i output
When I compile the attached code with
gcc -Wshadow ./gcc-shadow-test.c
it passes with no output/warnings. The warning about shadowing is displayed
properly by g++, clang and clang++ and the first print() actually proves that
gcc does see the "environ" variable from unistd.h but ignores it when resolving
shadowing.
gcc -v:
Using built-in specs.
COLLECT_GCC=/usr/bin/gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/10.2.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with:
/var/tmp/portage/sys-devel/gcc-10.2.0/work/gcc-10.2.0/configure
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr
--bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/10.2.0
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/10.2.0
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/10.2.0/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/10.2.0/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/include/g++-v10
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/10.2.0/python
--enable-languages=c,c++,fortran --enable-obsolete --enable-secureplt
--disable-werror --with-system-zlib --enable-nls --without-included-gettext
--enable-checking=release --with-bugurl=https://bugs.gentoo.org/
--with-pkgversion='Gentoo 10.2.0 p1' --disable-esp --enable-libstdcxx-time
--with-build-config=bootstrap-lto --enable-shared --enable-threads=posix
--enable-__cxa_atexit --enable-clocale=gnu --enable-multilib
--with-multilib-list=m32,m64 --disable-fixed-point --enable-targets=all
--enable-libgomp --disable-libssp --disable-libada --disable-systemtap
--enable-vtable-verify --with-zstd --enable-lto --without-isl
--enable-default-pie --enable-default-ssp
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 10.2.0 (Gentoo 10.2.0 p1)
