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aarch64: Always use .init/.fini_array for GNU/Linux 

I was wondering why the (now fixed) c-c++-common/attr-retain-[78].c
failures were showing up in the native results for aarch64-linux-gnu
but not in the posted cross results.  It turns out that .init/
.fini_array support is disabled by default for cross builds,
which in turn stops those tests from running.

The test for .init/fini_array support has two parts: one that builds
something with the assembler and linker, and another that compiles
C code and uses preprocessor macros to test the glibc version.
The first test would work with build=host but the second is only
safe for build=target.

However, AArch64 postdates glibc and binutils support for
.init/fini_array by some distance, so it's safe to hard-code the
result to "yes" for cross compilers.

This fixes the only material difference in auto-host.h between
a native and a cross build.

gcc/
	* acinclude.m4 (gcc_AC_INITFINI_ARRAY): When cross-compiling,
	default to yes for aarch64-linux-gnu.
	* configure: Regenerate.
This commit is contained in:
Richard Sandiford 2021-04-21 15:36:51 +01:00
parent 0a18305ee1
commit f7f2165c0b
2 changed files with 24 additions and 4 deletions
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14
gcc/acinclude.m4
View File

@ -422,8 +422,18 @@ changequote([,])dnl
])],, [gcc_cv_initfini_array=no]);;
esac
else
AC_MSG_CHECKING(cross compile... guessing)
gcc_cv_initfini_array=no
case "${target}" in
aarch64*-linux-gnu*)
# AArch64 postdates glibc support for .init_array/.fini_array,
# so we don't need the preprocessor test above.
gcc_cv_initfini_array=yes
;;
*)
AC_MSG_CHECKING(cross compile... guessing)
gcc_cv_initfini_array=no
;;
esac
fi])
enable_initfini_array=$gcc_cv_initfini_array
])

14
gcc/configure vendored
View File

@ -24132,9 +24132,19 @@ fi
rm -f conftest.err conftest.i conftest.$ac_ext;;
esac
else
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking cross compile... guessing" >&5
case "${target}" in
aarch64*-linux-gnu*)
# AArch64 postdates glibc support for .init_array/.fini_array,
# so we don't need the preprocessor test above.
gcc_cv_initfini_array=yes
;;
*)
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking cross compile... guessing" >&5
$as_echo_n "checking cross compile... guessing... " >&6; }
gcc_cv_initfini_array=no
gcc_cv_initfini_array=no
;;
esac
fi
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $gcc_cv_initfini_array" >&5