tree e78afd488d70fb1d96bb210a03146a0efe9c6999
parent 7c99b7d5dafdbff264b5b8d7e96ec81f0c4892cd
author Brad King <brad.king@kitware.com> 1595855262 -0400
committer Brad King <brad.king@kitware.com> 1595861623 -0400

Compilers: Ignore -print-sysroot prefix when it is '/'

Since commit 8cc384f629 (Compilers: Add paths from -print-sysroot to
system prefix path, 2020-03-25, v3.18.0-rc1~337^2) we prepend the
compiler's sysroot to `CMAKE_SYSTEM_PREFIX_PATH`.  This does not
make sense when the prefix is just `/`, such as on Ubuntu 16.04's
system compiler.

Fixes: #21019