gperftools: Undefined reference to `TCMallocGetenvSafe` on PPC and i386

This error popped up when adding gperftools 2.14 to spack (full log: https://gitlab.spack.io/spack/spack/-/jobs/9711611#L937L):

libtool: link: /builds/spack/spack/lib/spack/env/gcc/g++ -std=gnu++11 -DNO_TCMALLOC_SAMPLES -g -O2 -o low_level_alloc_unittest src/base/low_level_alloc_unittest-low_level_alloc.o src/low_level_alloc_unittest-malloc_hook.o src/low_level_alloc_unittest-mmap_hook.o src/tests/low_level_alloc_unittest-low_level_alloc_unittest.o  ./.libs/libspinlock.a ./.libs/libsysinfo.a ./.libs/liblogging.a -lunwind
/bin/bash ./libtool  --tag=CXX   --mode=link /builds/spack/spack/lib/spack/env/gcc/g++ -std=gnu++11 -Wall -Wwrite-strings -Woverloaded-virtual -Wno-sign-compare -Wno-unused-result -fsized-deallocation -faligned-new   -DSTACKTRACE_IS_TESTED -g -O2 -export-dynamic -lunwind -o stacktrace_unittest src/tests/stacktrace_unittest-stacktrace_unittest.o src/stacktrace_unittest-stacktrace.o src/base/stacktrace_unittest-elf_mem_image.o src/base/stacktrace_unittest-vdso_support.o      -lunwind libspinlock.la libsysinfo.la liblogging.la liblogging.la libfake_stacktrace_scope.la  
libtool: link: /builds/spack/spack/lib/spack/env/gcc/g++ -std=gnu++11 -Wall -Wwrite-strings -Woverloaded-virtual -Wno-sign-compare -Wno-unused-result -fsized-deallocation -faligned-new -DSTACKTRACE_IS_TESTED -g -O2 -o stacktrace_unittest src/tests/stacktrace_unittest-stacktrace_unittest.o src/stacktrace_unittest-stacktrace.o src/base/stacktrace_unittest-elf_mem_image.o src/base/stacktrace_unittest-vdso_support.o -Wl,--export-dynamic  ./.libs/libspinlock.a ./.libs/libsysinfo.a ./.libs/liblogging.a ./.libs/libfake_stacktrace_scope.a -lunwind
/usr/bin/ld: ./.libs/liblogging.a(dynamic_annotations.o): in function `RunningOnValgrind':
/tmp/root/spack-stage/spack-stage-gperftools-2.14-yhb2lpga7yyb63xsmnvew4zncsdphkj7/spack-src/src/base/dynamic_annotations.cc:46: undefined reference to `TCMallocGetenvSafe'
collect2: error: ld returned 1 exit status
make: *** [Makefile:4410: stacktrace_unittest] Error 1
make: *** Waiting for unfinished jobs....

x86 builds seem to be fine. I don’t have direct access to the PPC environment so I can’t really do interactive debugging, but I can try out patches if that’s helpful. Pinging @barracuda156 in case you have some ideas and/or debugging help since I’ve seen you test PPC builds before (apologies if you’re not interested or don’t have the time).