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@xxxxxxxxxxxx>
* gcc/config.gcc: Force .init_array for ARC
Signed-off-by: Vineet Gupta <vgupta@xxxxxxxxxxxx>
---
gcc/ChangeLog | 4 ++++
gcc/config.gcc | 3 +++
2 files changed, 7 insertions(+)
diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index f5872dbeab7c..4c86d5375bcc 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+2019-01-28 Vineet Gupta <vgupta@xxxxxxxxxxxx>
+
+ * gcc/config.gcc: Force .init_array for ARC
+
2019-01-28 Jakub Jelinek <jakub@xxxxxxxxxx>
PR middle-end/89002
diff --git a/gcc/config.gcc b/gcc/config.gcc
index a189cb19f633..eef4b4eac918 100644
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -1110,6 +1110,9 @@ 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"
--
2.7.4
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