linux-kernel - [PATCH] radix tree test suite: Fix build with --as-needed

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Date:   Thu,  2 Mar 2017 20:29:12 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     mawilcox@...rosoft.com
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: [PATCH] radix tree test suite: Fix build with --as-needed

Currently the radix tree test suite doesn't build with toolchains that
use --as-needed by default, for example Ubuntu's:

  cc -I. -I../../include -g -O2 -Wall -D_LGPL_SOURCE -fsanitize=address -lpthread -lurcu main.o ... -o main
  /usr/bin/ld: regression1.o: undefined reference to symbol 'pthread_join@@GLIBC_2.17'
  /lib/powerpc64le-linux-gnu/libpthread.so.0: error adding symbols: DSO missing from command line
  collect2: error: ld returned 1 exit status

This is caused by the custom makefile rules placing LDFLAGS before the
.o files that need the libraries.

We could fix it by using --no-as-needed, or rewriting the custom rules.
But we can also just drop the custom rules and move the libraries to
LDLIBS, and then the default rules work correctly - with the one caveat
that we need to add -fsanitize=address to LDFLAGS because that must be
passed to the linker as well as the compiler.

Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
---
 tools/testing/radix-tree/Makefile | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/tools/testing/radix-tree/Makefile b/tools/testing/radix-tree/Makefile
index ecea846e7660..4831cb89cbfb 100644
--- a/tools/testing/radix-tree/Makefile
+++ b/tools/testing/radix-tree/Makefile
@@ -1,6 +1,7 @@

 CFLAGS += -I. -I../../include -g -O2 -Wall -D_LGPL_SOURCE -fsanitize=address
-LDFLAGS += -lpthread -lurcu
+LDFLAGS += -fsanitize=address
+LDLIBS += -lpthread -lurcu
 TARGETS = main idr-test multiorder
 CORE_OFILES := radix-tree.o idr.o linux.o test.o find_bit.o
 OFILES = main.o $(CORE_OFILES) regression1.o regression2.o regression3.o \
@@ -13,13 +14,10 @@ endif
 targets: $(TARGETS)

 main:	$(OFILES)
-	$(CC) $(CFLAGS) $(LDFLAGS) $^ -o main

 idr-test: idr-test.o $(CORE_OFILES)
-	$(CC) $(CFLAGS) $(LDFLAGS) $^ -o idr-test

 multiorder: multiorder.o $(CORE_OFILES)
-	$(CC) $(CFLAGS) $(LDFLAGS) $^ -o multiorder

 clean:
 	$(RM) $(TARGETS) *.o radix-tree.c idr.c
-- 
2.7.4