[Bug gcov-profile/95480] New: GCOV change breaks AIX build

[dje at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95480

            Bug ID: 95480
           Summary: GCOV change breaks AIX build
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: critical
          Priority: P3
         Component: gcov-profile
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dje at gcc dot gnu.org
                CC: marxin at gcc dot gnu.org
  Target Milestone: ---
            Target: powerpc-ibm-aix*

The June 2 change to gcov breaks AIX because it now requires atomic 64 bit
operations in 32 bit mode.

g++-6.2.0 -std=c++11 -no-pie   -g   -DIN_GCC     -fno-exceptions -fno-rtti
-fasynchronous-unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings
-Wcast-qual -Wno-format -Wmissing-format-attribute -Woverloaded-virtual
-pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings
-fno-common  -DHAVE_CONFIG_H -static-libstdc++ -static-libgcc -Wl,-bbigtoc 
gcov-tool.o libgcov-util.o libgcov-driver-tool.o libgcov-merge-tool.o
libcommon.a ../libcpp/libcpp.a ./../intl/libintl.a
/gsa/yktgsa/home/e/d/edelsohn/install/lib/libiconv.a 
../libbacktrace/.libs/libbacktrace.a ../libiberty/libiberty.a
../libdecnumber/libdecnumber.a  -o gcov-tool
ld: 0711-317 ERROR: Undefined symbol: .__atomic_fetch_add_8
ld: 0711-317 ERROR: Undefined symbol: .__sync_val_compare_and_swap_8
ld: 0711-345 Use the -bloadmap or -bnoquiet option to obtain more information.
collect2: error: ld returned 8 exit status
make: *** [Makefile:3044: gcov-tool] Error 1