[gdbserver] disable Elf32_auxv_t/Elf64_auxv_t AC_CHECK_TYPES check on Android

See the comment added in configure.ac for more details behind
this change.

gdb/gdbserver/ChangeLog:

        * configure.ac: Do not call AC_CHECK_TYPES for Elf32_auxv_t
        and Elf64_auxv_t if the target is Android.

1 files changed, 15 insertions, 1 deletions

diff --git a/gdb/gdbserver/configure b/gdb/gdbserver/configure
index 87dfda0..ccb9639 100755
--- a/gdb/gdbserver/configure
+++ b/gdb/gdbserver/configure
@@ -6442,7 +6442,20 @@ _ACEOF
 fi
 
 
-ac_fn_c_check_type "$LINENO" "Elf32_auxv_t" "ac_cv_type_Elf32_auxv_t" "#include <elf.h>
+case "${target}" in
+  *-android*)
+    # Starting with NDK version 9, <elf.h> actually includes definitions
+    # of Elf32_auxv_t and Elf64_auxv_t. But sadly, <elf.h> includes
+    # <sys/exec_elf.h> which defines some of the ELF types incorrectly,
+    # leading to conflicts with the defintions from <linux/elf.h>.
+    # This makes it impossible for us to include both <elf.h> and
+    # <linux/elf.h>, which means that, in practice, we do not have
+    # access to Elf32_auxv_t and Elf64_auxv_t on this platform.
+    # Therefore, do not try to auto-detect availability, as it would
+    # get it wrong on this platform.
+    ;;
+  *)
+    ac_fn_c_check_type "$LINENO" "Elf32_auxv_t" "ac_cv_type_Elf32_auxv_t" "#include <elf.h>
 
 "
 if test "x$ac_cv_type_Elf32_auxv_t" = x""yes; then :
@@ -6465,6 +6478,7 @@ _ACEOF
 
 fi
 
+esac