Patches to build libelf with clang toolchain

lib-makefile-warning-clang.patch

Index: src/embedded_libelf/lib/Makefile.in
===================================================================
--- src.orig/embedded_libelf/lib/Makefile.in
+++ src/embedded_libelf/lib/Makefile.in
@@ -330,9 +330,9 @@ ARFLAGS = cr

 # Use strict fallthrough. Only __attribute__((fallthrough)) will prevent the
 # warning
-@HAVE_IMPLICIT_FALLTHROUGH_WARNING_TRUE@IMPLICIT_FALLTHROUGH_WARNING = -Wimplicit-fallthrough=5
+@HAVE_IMPLICIT_FALLTHROUGH_WARNING_TRUE@IMPLICIT_FALLTHROUGH_WARNING = -Wimplicit-fallthrough
 AM_CFLAGS = -std=gnu99 -Wall -Wshadow -Wformat=2 \
-       -Wold-style-definition -Wstrict-prototypes -Wtrampolines \
+       -Wold-style-definition -Wstrict-prototypes \
        $(LOGICAL_OP_WARNING) $(DUPLICATED_COND_WARNING) \
        $(NULL_DEREFERENCE_WARNING) $(IMPLICIT_FALLTHROUGH_WARNING) \
        $(if $($(*F)_no_Werror),,-Werror) $(if \

libelf-configure.patch

--- embedded_libelf.orig/configure      2020-01-08 16:27:19.928828790 +0000
+++ embedded_libelf/configure   2020-01-07 22:00:32.461225958 +0000
@@ -5007,53 +5007,6 @@
 fi


-# We use -std=gnu99 but have explicit checks for some language constructs
-# and GNU extensions since some compilers claim GNU99 support, but don't
-# really support all language extensions. In particular we need
-# Mixed Declarations and Code
-# https://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html
-# Nested Functions
-# https://gcc.gnu.org/onlinedocs/gcc/Nested-Functions.html
-# Arrays of Variable Length
-# https://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for gcc with GNU99 support" >&5
-$as_echo_n "checking for gcc with GNU99 support... " >&6; }
-if ${ac_cv_c99+:} false; then :
-  $as_echo_n "(cached) " >&6
-else
-  old_CFLAGS="$CFLAGS"
-CFLAGS="$CFLAGS -std=gnu99"
-cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-int foo (int a)
-{
-  for (int i = 0; i < a; ++i) if (i % 4) break; int s = a; return s;
-}
-
-double bar (double a, double b)
-{
-  double square (double z) { return z * z; }
-  return square (a) + square (b);
-}
-
-void baz (int n)
-{
-  struct S { int x[n]; };
-}
-_ACEOF
-if ac_fn_c_try_compile "$LINENO"; then :
-  ac_cv_c99=yes
-else
-  ac_cv_c99=no
-fi
-rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
-CFLAGS="$old_CFLAGS"
-fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_c99" >&5
-$as_echo "$ac_cv_c99" >&6; }
-if test "x$ac_cv_c99" != xyes; then :
-  as_fn_error $? "gcc with GNU99 support required" "$LINENO" 5
-fi

 { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether gcc supports __attribute__((visibility()))" >&5
 $as_echo_n "checking whether gcc supports __attribute__((visibility()))... " >&6; }
 
 

libelf-makefile-warning-clang.patch

--- embedded_libelf.orig/libelf/Makefile.in
+++ embedded_libelf/libelf/Makefile.in
@@ -493,9 +493,9 @@ ARFLAGS = cr

 # Use strict fallthrough. Only __attribute__((fallthrough)) will prevent the
 # warning
-@HAVE_IMPLICIT_FALLTHROUGH_WARNING_TRUE@IMPLICIT_FALLTHROUGH_WARNING = -Wimplicit-fallthrough=5
+@HAVE_IMPLICIT_FALLTHROUGH_WARNING_TRUE@IMPLICIT_FALLTHROUGH_WARNING = -Wimplicit-fallthrough
 AM_CFLAGS = -std=gnu99 -Wall -Wshadow -Wformat=2 \
-       -Wold-style-definition -Wstrict-prototypes -Wtrampolines \
+       -Wold-style-definition -Wstrict-prototypes \
        $(LOGICAL_OP_WARNING) $(DUPLICATED_COND_WARNING) \
        $(NULL_DEREFERENCE_WARNING) $(IMPLICIT_FALLTHROUGH_WARNING) \
        $(if $($(*F)_no_Werror),,-Werror) $(if \