[ARC] Enable init_array support.

gcc's common configure script has a subtle flaw that it only tests
{init,fini.preinit}_array support when NOT cross compiling. This causes
cross builds to erroneously deduce that the feature is not supported by
the target.

| host-gcc-final-ab544139bfee/build/gcc/config.log
|
|configure:22941: checking for .preinit_array/.init_array/.fini_array support
|configure:23106: checking cross compile... guessing
|configure:23111: result: no

The right fix is to enable this for *all* cross setups (and address any
fallouts). However in the short-term to enable ARC glibc port to upstream,
force enable this for ARC.

This has been discussed at length on glibc mailing list [1], [2]

[1] https://sourceware.org/ml/libc-alpha/2018-11/msg00870.html
[2] https://sourceware.org/ml/libc-alpha/2019-01/msg00656.html

gcc/

2019-xx-xx  Vineet Gupta <vgupta@synopsys.com>

	* gcc/config.gcc: Force .init_array for ARC

From-SVN: r268365

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 9a3d7d5..dbaf550 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+2019-01-29  Vineet Gupta  <vgupta@synopsys.com>
+
+       * gcc/config.gcc: Force .init_array for ARC.
+
 2019-01-29  Richard Biener  <rguenther@suse.de>
 
        PR debug/87295

diff --git a/gcc/config.gcc b/gcc/config.gcc
index a189cb1..f7b7dcc 100644 (file)
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -1110,7 +1110,10 @@ arc*-*-linux*)
        case ${with_endian} in
        big*)   tm_file="arc/big.h ${tm_file}"
        esac
-        ;;
+       # Force .init_array support.  The configure script cannot always
+       # automatically detect that GAS supports it, yet we require it.
+       gcc_cv_initfini_array=yes
+       ;;
 arm-wrs-vxworks|arm-wrs-vxworks7)
        extra_options="${extra_options} arm/vxworks.opt"
        tmake_file="${tmake_file} arm/t-arm arm/t-vxworks"