intel-oneapi-mkl: do not set __INTEL_POST_CFLAGS env variable (#40947)

This triggers warnings from icx compiler - that breaks petsc configure

$ I_MPI_CC=icx /opt/intel/oneapi/mpi/2021.7.0/bin/mpiicc -E a.c > /dev/null
$ __INTEL_POST_CFLAGS=-Wl,-rpath,/opt/intel/oneapi/mkl/2022.2.0/lib/intel64 I_MPI_CC=icx /opt/intel/oneapi/mpi/2021.7.0/bin/mpiicc -E a.c > /dev/null
icx: warning: -Wl,-rpath,/opt/intel/oneapi/mkl/2022.2.0/lib/intel64: 'linker' input unused [-Wunused-command-line-argument]

1 files changed, 0 insertions, 15 deletions

diff --git a/var/spack/repos/builtin/packages/intel-oneapi-mkl/package.py b/var/spack/repos/builtin/packages/intel-oneapi-mkl/package.py
index 2eef32fa14..1d80c52f62 100644
--- a/var/spack/repos/builtin/packages/intel-oneapi-mkl/package.py
+++ b/var/spack/repos/builtin/packages/intel-oneapi-mkl/package.py
@@ -149,21 +149,6 @@ class IntelOneapiMkl(IntelOneApiLibraryPackage):
         else:
             return IntelOneApiStaticLibraryList(libs, system_libs)
 
-    def setup_run_environment(self, env):
-        super().setup_run_environment(env)
-
-        # Support RPATH injection to the library directories when the '-mkl' or '-qmkl'
-        # flag of the Intel compilers are used outside the Spack build environment. We
-        # should not try to take care of other compilers because the users have to
-        # provide the linker flags anyway and are expected to take care of the RPATHs
-        # flags too. We prefer the __INTEL_POST_CFLAGS/__INTEL_POST_FFLAGS flags over
-        # the PRE ones so that any other RPATHs provided by the users on the command
-        # line come before and take precedence over the ones we inject here.
-        for d in self._find_mkl_libs(self.spec.satisfies("+shared")).directories:
-            flag = "-Wl,-rpath,{0}".format(d)
-            env.append_path("__INTEL_POST_CFLAGS", flag, separator=" ")
-            env.append_path("__INTEL_POST_FFLAGS", flag, separator=" ")
-
     def setup_dependent_build_environment(self, env, dependent_spec):
         # Only if environment modifications are desired (default is +envmods)
         if self.spec.satisfies("+envmods"):