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radix tree test suite: Fix build with --as-needed

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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@ellerman.id.au>
Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
This commit is contained in:
Michael Ellerman 2017-03-02 04:29:00 -05:00 committed by Matthew Wilcox
parent c4634b08d9
commit 284d96a494
1 changed files with 2 additions and 4 deletions
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6
tools/testing/radix-tree/Makefile
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@ -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 \
@ -17,13 +18,10 @@ endif
targets: mapshift $(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 generated/map-shift.h