[CMakeMake] Remove build directory if it exists

without also ensuring that the directories that are used for that build are also unique
there are build problems with bundles that contain more than one CMake package and didn’t
explicitly set separate_build_dir to false

This also applies partially to multiple iterations of the same software build (e.g. configopts)

As the build directory is unique to EasyBuild it is save to remove

Author: Flamefire

easybuild/easyblocks/generic/cmakemake.py

@@ -39,7 +39,7 @@
 from easybuild.framework.easyconfig import CUSTOM
 from easybuild.tools.build_log import print_warning
 from easybuild.tools.config import build_option
-from easybuild.tools.filetools import change_dir, mkdir, which
+from easybuild.tools.filetools import change_dir, mkdir, which, remove_dir
 from easybuild.tools.environment import setvar
 from easybuild.tools.modules import get_software_root
 from easybuild.tools.run import run_cmd
@@ -120,6 +120,12 @@ def configure_step(self, srcdir=None, builddir=None):
 
         if builddir is None and self.cfg.get('separate_build_dir', True):
             builddir = os.path.join(self.builddir, 'easybuild_obj')
+            # For separate_build_dir we want a clean folder. So remove if it exists
+            # This can happen when multiple iterations are done (e.g. shared, static, ...)
+            if os.path.exists(builddir):
+                self.log.warning('Build directory %s already exists (from previous iterations?). Removing...',
+                                 builddir)
+                remove_dir(builddir)
 
         if builddir:
             mkdir(builddir, parents=True)