https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96039
Bug ID: 96039
Summary: Missing diagnostic: C++11 alignment specifier on
bit-fields
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: hstong at ca dot ibm.com
Target Milestone: ---
According to [dcl.align] in the 2020 DIS for C++, an alignment-specifier shall
not be applied to a bit-field. GCC allows such alignment-specifiers with no
diagnostic.
### SOURCE (<stdin>):
struct A {
int x alignas(long long) : 32;
};
### COMPILER INVOCATION:
g++ -fsyntax-only -std=c++11 -Wall -Wextra -pedantic-errors -xc++ -
### ACTUAL OUTPUT:
(rc=0)
### EXPECTED OUTPUT:
Diagnostic message; likely an error.
### COMPILER VERSION INFO (g++ -v):
Using built-in specs.
COLLECT_GCC=/opt/wandbox/gcc-head/bin/g++
COLLECT_LTO_WRAPPER=/opt/wandbox/gcc-head/libexec/gcc/x86_64-pc-linux-gnu/11.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../source/configure --prefix=/opt/wandbox/gcc-head
--enable-languages=c,c++ --disable-multilib --without-ppl --without-cloog-ppl
--enable-checking=release --disable-nls --enable-lto
LDFLAGS=-Wl,-rpath,/opt/wandbox/gcc-head/lib,-rpath,/opt/wandbox/gcc-head/lib64,-rpath,/opt/wandbox/gcc-head/lib32
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 11.0.0 20200701 (experimental) (GCC)
