https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116678
Bug ID: 116678
Summary: "-Os" triggers [[deprecated]] on a class ctor
definition with implementation
Product: gcc
Version: 14.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: zetab007 at gmail dot com
Target Milestone: ---
When using the [[deprecated]] attribute on a class ctor definition with
implementation and compiling with "-Os" flag, the deprecation message will be
triggered even when the class is not used.
test.cpp:
class test_class
{
public:
[[deprecated("deprecated ctor without parameter.")]]
test_class() { m_var = 1; }
test_class(int a) { m_var = a; }
~test_class() {}
private:
int m_var;
};
int main()
{
return 0;
}
Compiling with following command gives the deprecation message.
g++ -Os -o test.o test.cpp
test.cpp: In constructor 'test_class::test_class()':
test.cpp:6:31: warning: 'test_class::test_class()' is deprecated: deprecated
ctor without parameter. [-Wdeprecated-declarations]
6 | test_class() { m_var = 1; }
| ^
test.cpp:6:5: note: declared here
6 | test_class() { m_var = 1; }
| ^~~~~~~~~~
test.cpp: In constructor 'test_class::test_class()':
test.cpp:6:31: warning: 'test_class::test_class()' is deprecated: deprecated
ctor without parameter. [-Wdeprecated-declarations]
6 | test_class() { m_var = 1; }
| ^
test.cpp:6:5: note: declared here
6 | test_class() { m_var = 1; }
| ^~~~~~~~~~
When compiling without "-Os" flag, everything is fine.
This seems only happen on windows.
The output of gcc -v:
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=C:/msys64/mingw32/bin/../lib/gcc/i686-w64-mingw32/14.2.0/lto-wrapper.exe
Target: i686-w64-mingw32
Configured with: ../gcc-14.2.0/configure --prefix=/mingw32
--with-local-prefix=/mingw32/local --build=i686-w64-mingw32
--host=i686-w64-mingw32 --target=i686-w64-mingw32
--with-native-system-header-dir=/mingw32/include --libexecdir=/mingw32/lib
--enable-bootstrap --enable-checking=release --with-arch=pentium4
--with-tune=generic --enable-languages=c,lto,c++,fortran --enable-shared
--enable-static --enable-libatomic --enable-threads=posix --enable-graphite
--enable-fully-dynamic-string --enable-libstdcxx-filesystem-ts
--enable-libstdcxx-time --disable-libstdcxx-pch --enable-lto --enable-libgomp
--disable-libssp --disable-multilib --disable-rpath --disable-win32-registry
--disable-nls --disable-werror --disable-symvers --with-libiconv
--with-system-zlib --with-gmp=/mingw32 --with-mpfr=/mingw32 --with-mpc=/mingw32
--with-isl=/mingw32 --with-pkgversion='Rev1, Built by MSYS2 project'
--with-bugurl=https://github.com/msys2/MINGW-packages/issues --with-gnu-as
--with-gnu-ld --disable-libstdcxx-debug --disable-sjlj-exceptions --with-dwarf2
--with-boot-ldflags=-static-libstdc++ --with-stage1-ldflags=-static-libstdc++
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 14.2.0 (Rev1, Built by MSYS2 project)
