https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89299
Bug ID: 89299
Summary: __attribute__ cleanup does not accept template
function
Product: gcc
Version: 8.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: paradox_ptr at protonmail dot ch
Target Milestone: ---
#include <cstdlib>
template <typename T>
void cu( T** p ) {
if ( p && *p ) { free( *p ); }
}
void cu_char( char** s ) {
if ( s && *s ) { free ( *s ); }
}
int main() {
__attribute__((cleanup(cu))) char* s = nullptr;
return 0;
}
Using template function for cleanup yields error:
$ g++ main.cpp --std=c++14 -Wall -Wextra
main.cpp: In function ‘int main()’:
main.cpp:13:37: error: cleanup argument not a function
__attribute__((cleanup(cu))) char* s = nullptr;
^
main.cpp:13:37: warning: unused variable ‘s’ [-Wunused-variable]
Same for cleanup(cu<char>). cleanup(cu_char) works, as expected.
Clearly, template function is still a function, especially when explicitly
instantiated.
GCC documentation for Common Variable Attributes does not state any limitations
for this function.
$ g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/8.2.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with:
/var/tmp/portage/sys-devel/gcc-8.2.0-r6/work/gcc-8.2.0/configure
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr
--bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/8.2.0
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/8.2.0/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/8.2.0
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/8.2.0/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/8.2.0/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/8.2.0/include/g++-v8
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/8.2.0/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 8.2.0-r6 p1.7' --disable-esp --enable-libstdcxx-time
--enable-shared --enable-threads=posix --enable-__cxa_atexit
--enable-clocale=gnu --enable-multilib --with-multilib-list=m32,m64
--disable-altivec --disable-fixed-point --enable-targets=all --enable-libgomp
--disable-libmudflap --disable-libssp --disable-libmpx --disable-systemtap
--enable-vtable-verify --enable-libvtv --enable-lto --without-isl
--enable-default-pie --enable-default-ssp
Thread model: posix
gcc version 8.2.0 (Gentoo 8.2.0-r6 p1.7)
