From 672eaebd131c789a528e3a9cd089b4b69a82012b Mon Sep 17 00:00:00 2001
From: Guillem Jover <guillem@debian.org>
Date: Fri, 28 Sep 2018 13:15:54 +0300
Subject: [PATCH] Link against libgcc to avoid unresolved symbols

We need to link agaisnt -lgcc, on at least hppa, PPC and ARC.
That's because in some corner-cases like compilation with -Os
on ARC and PPC so-called millicode (basically function prologue and
epilogue) implemented in libgcc.a is used. So we end up with
GLOBAL UNDEFINED symbol in libaio.so and then on linkage of the final
applicaiton LD fails to proceed saying:
--------------------------->8----------------------
hidden symbol '__ld_r13_to_r15_ret' in .../libgcc.a(_millicodethunk_ret.o) is referenced by DSO
--------------------------->8----------------------

Also it looks like in general it is not the best idea to use either
"-nostartfiles" or "-nostdlib" when linking shared libs because
default construtor/destructor functions won't be executed, see
"5.2. Library constructor and destructor functions" in [1]

So let's stop passing "-nostdlib" and "-nostartfiles" and get required
stuff built-in libaio.

Initial patch taken from Debian [2].

Fixes build failures in Buildroot like blktrace [3], lvm2 [4].

Was submitted upstream via pull-request [5].

[1] http://tldp.org/HOWTO/Program-Library-HOWTO/miscellaneous.html
[2] https://sources.debian.org/patches/libaio/0.3.111-1/01_link_libs.patch/
[3] http://autobuild.buildroot.net/results/17461209755038a30118d76acb4f43469a22a139/
[4] http://autobuild.buildroot.net/results/a5dfc87f94b97135e5cc84f6a876114891ed9dd9/
[5] https://pagure.io/libaio/pull-request/7

Signed-off-by: Guillem Jover <guillem@debian.org>
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
---
 src/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Makefile b/src/Makefile
index eadb336b47e3..5911c810c766 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -3,7 +3,7 @@ includedir=$(prefix)/include
 libdir=$(prefix)/lib
 
 CFLAGS ?= -g -fomit-frame-pointer -O2
-CFLAGS += -nostdlib -nostartfiles -Wall -I. -fPIC
+CFLAGS += -Wall -I. -fPIC
 SO_CFLAGS=-shared $(CFLAGS)
 L_CFLAGS=$(CFLAGS)
 LINK_FLAGS=
-- 
2.17.1