https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118280
Bug ID: 118280
Summary: undefined symbol __atomic_test_and_set in libstdc++.so
on Microblaze
Product: gcc
Version: 14.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: thomas.petazz...@free-electrons.com
Target Milestone: ---
Since gcc 14.x, the libstdc++ library uses __atomic_test_and_set, and this
symbol isn't available on Microblaze, causing build failures such as:
configure:2557: checking for C++ compiler default output file name
configure:2579:
/home/thomas/buildroot/buildroot/outputs/gcc14-microblaze/host/bin/microblazeel-buildroot-linux-gnu-g++
-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -O2 -g0
-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 conftest.cpp
>&5
/home/thomas/buildroot/buildroot/outputs/gcc14-microblaze/host/lib/gcc/microblazeel-buildroot-linux-gnu/14.2.0/../../../../microblazeel-buildroot-linux-gnu/bin/ld:
/home/thomas/buildroot/buildroot/outputs/gcc14-microblaze/host/lib/gcc/microblazeel-buildroot-linux-gnu/14.2.0/../../../../microblazeel-buildroot-linux-gnu/lib/libstdc++.so:
undefined reference to `__atomic_test_and_set'
collect2: error: ld returned 1 exit status
configure:2583: $? = 1
configure:2621: result:
configure: failed program was:
| /* confdefs.h. */
| #define PACKAGE_NAME ""
| #define PACKAGE_TARNAME ""
| #define PACKAGE_VERSION ""
| #define PACKAGE_STRING ""
| #define PACKAGE_BUGREPORT ""
| #define PACKAGE "acpitool"
| #define VERSION "0.5.1"
| /* end confdefs.h. */
|
| int
| main ()
| {
|
| ;
| return 0;
The exact same code builds fine with gcc 13.x.
Reproducer:
$ git clone https://gitlab.com/buildroot.org/buildroot.git
$ cat > .config<<EOF
BR2_microblazeel=y
BR2_GCC_VERSION_14_X=y
BR2_TOOLCHAIN_BUILDROOT_CXX=y
BR2_PACKAGE_ACPITOOL=y
EOF
$ make olddefconfig
$ make
