patches to apply to gdbm and m4 when using oneapi compiler (spack#21740)

var/spack/repos/builtin/packages/gdbm/package.py

@@ -30,6 +30,7 @@ class Gdbm(AutotoolsPackage, GNUMirrorPackage):
     patch('gdbm.patch', when='%clang@11:')
     patch('gdbm.patch', when='%cce@11:')
     patch('gdbm.patch', when='%aocc@2:')
+    patch('gdbm.patch', when='%oneapi')
 
     def configure_args(self):
 

var/spack/repos/builtin/packages/m4/oneapi.patch

@@ -0,0 +1,18 @@
+--- a/lib/xalloc-oversized.h	2020-08-07 11:04:56.154698639 -0700
++++ b/lib/xalloc-oversized.h	2020-08-07 11:06:11.667997389 -0700
+@@ -46,13 +46,13 @@
+    positive and N must be nonnegative.  This is a macro, not a
+    function, so that it works correctly even when SIZE_MAX < N.  */
+
+-#if 7 <= __GNUC__ || __has_builtin (__builtin_add_overflow_p)
++#if ((7 <= __GNUC__ || __has_builtin (__builtin_add_overflow_p)) && !defined __INTEL_LLVM_COMPILER)
+ # define xalloc_oversized(n, s) \
+    __builtin_mul_overflow_p (n, s, (__xalloc_count_type) 1)
+ #elif ((5 <= __GNUC__ \
+         || (__has_builtin (__builtin_mul_overflow) \
+             && __has_builtin (__builtin_constant_p))) \
+-       && !__STRICT_ANSI__)
++       && !__STRICT_ANSI__ && !defined __INTEL_LLVM_COMPILER)
+ # define xalloc_oversized(n, s) \
+    (__builtin_constant_p (n) && __builtin_constant_p (s) \
+     ? __xalloc_oversized (n, s) \

var/spack/repos/builtin/packages/m4/package.py

@@ -18,6 +18,7 @@ class M4(AutotoolsPackage, GNUMirrorPackage):
     patch('gnulib-pgi.patch', when='@1.4.18')
     patch('pgi.patch', when='@1.4.17')
     patch('nvhpc.patch', when='%nvhpc')
+    patch('oneapi.patch', when='%oneapi')
     # from: https://github.com/Homebrew/homebrew-core/blob/master/Formula/m4.rb
     # Patch credit to Jeremy Huddleston Sequoia <jeremyhu@apple.com>
     patch('secure_snprintf.patch', when='os = highsierra')