https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87947
Bug ID: 87947
Summary: Symbol Does Not Appear in Object File
Product: gcc
Version: 8.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: comm+gnu at squotd dot net
Target Milestone: ---
A symbol is not exposed in cirucumstances where it seems it should be, and is
exposed in version 6.3.0 (and clang 7.0.0, fwiw).
$ gcc --save-temps -std=c++17 -c symbol.cpp
$ cat symbol.ii
# 1 "symbol.cpp"
# 1 "<built-in>"
# 1 "<command-line>"
# 1 "/usr/include/stdc-predef.h" 1 3 4
# 1 "<command-line>" 2
# 1 "symbol.cpp"
struct A {
static constexpr auto foobar = 0;
};
constexpr int A::foobar;
$ nm symbol.o
$
The expected behavior is that A::foobar is exposed as a symbol. Note that
-std=c++17 is required to duplicate this.
The same thing done with 6.3.0 results in this.
$ nm symbol.o
0000000000000000 R _ZN1A6foobarE
Version information is as follows.
$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-pc-linux-gnu/8.2.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /build/gcc/src/gcc/configure --prefix=/usr --libdir=/usr/lib
--libexecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info
--with-bugurl=https://bugs.archlinux.org/
--enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++ --enable-shared
--enable-threads=posix --enable-libmpx --with-system-zlib --with-isl
--enable-__cxa_atexit --disable-libunwind-exceptions --enable-clocale=gnu
--disable-libstdcxx-pch --disable-libssp --enable-gnu-unique-object
--enable-linker-build-id --enable-lto --enable-plugin
--enable-install-libiberty --with-linker-hash-style=gnu
--enable-gnu-indirect-function --enable-multilib --disable-werror
--enable-checking=release --enable-default-pie --enable-default-ssp
--enable-cet=auto
Thread model: posix
gcc version 8.2.1 20180831 (GCC)
