[PATCH libaio] 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].

[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/

Signed-off-by: Guillem Jover <guillem@debian.org>
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Gbp-Pq: Topic upstream
Gbp-Pq: Name 0001-Link-against-libgcc-to-avoid-unresolved-symbols.patch

diff --git a/src/Makefile b/src/Makefile
index b437945f7c4fc47c4a8435d7f5a4b51031dedabe..37ae219a83c0c72390804a6126324eaede8d652e 100644 (file)
--- 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=