Bug#972333: llvm-toolchain-11: FTBFS on mipsel: realloc(): invalid old size

[Sebastian Ramacher]

Source: llvm-toolchain-11
Version: 1:11.0.0-1
Severity: serious
Tags: ftbfs sid bullseye
Justification: fails to build from source (but built successfully in the past)

llvm-toolchain-11 currently FTBFS on mipsel64:
| cd build-llvm; \
| CFLAGS=`dpkg-buildflags --get CFLAGS`; \
| CFLAGS="$CFLAGS `dpkg-buildflags --get CPPFLAGS`"; \
| echo $CFLAGS; \
| /<<PKGBUILDDIR>>/build-llvm/tools/clang/stage2-bins/bin/clang++ -c $CFLAGS -std=c++11 /<<PKGBUILDDIR>>/compiler-rt/lib/fuzzer/*.cpp -IFuzzer; \
| ar ruv libFuzzer.a Fuzzer*.o
| -g -O2 -fdebug-prefix-map=/<<PKGBUILDDIR>>/build-llvm=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2
| realloc(): invalid old size
| Aborted
| ar: `u' modifier ignored since `D' is the default (see `U')
| ar: creating libFuzzer.a
| ar: Fuzzer*.o: No such file or directory
| make[1]: *** [debian/rules:425: debian-libfuzzer-build] Error 1

See
https://buildd.debian.org/status/fetch.php?pkg=llvm-toolchain-11&arch=ppc64el&ver=1%3A11.0.0-2&stamp=1602683353&raw=0

It fails in the same step as llvm-toolchain-10 (#972318), but fails in a
different way.

Cheers
-- 
Sebastian Ramacher