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Re: [reSIProcate] building shared libraries on AMD64

From: Byron Campen <bcampen@xxxxxxxxxxxx>
Date: Fri, 22 Sep 2006 16:49:30 -0500

Ok, the problem seems to be that, when we convince the build systemto start compiling object files with -fPIC, there seems to be no wayto convince it to NOT use -fPIC when compiling an object file for anexecutable. (The build system builds all *.o in exactly the samemanner) Compiling the object file for an executable with -fPIC justdoesn't work. It looks to me like fixing this will require invasivechanges to the build system, and I don't think this will bemanageable by the RC4 drop in the next 20 minutes or so.


        Jason, do you have any ideas?

Best regards,
Byron Campen

        This slightly beefier patch seems to be working so far for me.

Index: build/Makefile.post
===================================================================
--- build/Makefile.post (revision 6598)
+++ build/Makefile.post (working copy)
@@ -83,7 +83,13 @@
DEPEND_TARGETS += $(foreach pkg,$(PACKAGES), $($(pkg)_TARGETS))
ifeq ($(BUILD_SHARED_LIBS),yes)
+
+ifeq ($(OSTYPE),Darwin)
+.dependlibs: $(patsubst %.a,%.dylib,$(DEPEND_FILES))
+else
.dependlibs: $(patsubst %.a,%.so,$(DEPEND_FILES))
+endif
+
else
.dependlibs: $(DEPEND_FILES)
endif
@@ -111,7 +117,12 @@
HWOBJS = $(patsubst %.cpp,$(OBJ)/%.o,$(patsubst %.c,$(OBJ)/%.o,$(patsubst %.cxx,$(OBJ)/%.o,$(HWSRC))))DEPENDENCIES = $(patsubst %.cpp,$(OBJ)/%.d,$(patsubst %.c,$(OBJ)/%.d,$(patsubst %.cxx,$(OBJ)/%.d,$(ALLSRC))))
+ifeq ($(OSTYPE),Darwin)
+SHARED_LIB = $(patsubst %,$(OBJ)/%.dylib,$(strip $(TARGET_LIBRARY)))
+else
SHARED_LIB = $(patsubst %,$(OBJ)/%.so,$(strip $(TARGET_LIBRARY)))
+endif
+
STATIC_LIB = $(patsubst %,$(OBJ)/%.a,$(strip $(TARGET_LIBRARY)))
ifeq ($(BUILD_SHARED_LIBS),yes)
@@ -293,6 +304,12 @@
        $(MKSHLIB) -o $@ $^
        -@ mkdir -p $(ROOT)/lib.$(TARGET_NAME)
@ test -h $(ROOT)/lib.$(TARGET_NAME)/$(strip $(TARGET_LIBRARY)).so || ln -s $(shell pwd)/$@ $(ROOT)/lib.$(TARGET_NAME)
+
+$(OBJ)/$(strip $(TARGET_LIBRARY)).dylib: $(OBJS) $(OTHERLIBS)
+       -@ test -f $@ && /bin/rm $@
+       $(MKSHLIB) -o $@ $^
+       -@ mkdir -p $(ROOT)/lib.$(TARGET_NAME)
+ @ test -h $(ROOT)/lib.$(TARGET_NAME)/$(strip $(TARGET_LIBRARY)).dylib || ln -s $(shell pwd)/$@ $(ROOT)/lib.$(TARGET_NAME)
endif
ifdef TARGET_BINARY
Index: build/Makefile.tools
===================================================================
--- build/Makefile.tools        (revision 6598)
+++ build/Makefile.tools        (working copy)
@@ -31,7 +31,14 @@
CC             = gcc
CXX            = g++
-MKSHLIB                := $(CC) -fPIC -shared
+
+ifeq ($(OSTYPE),Darwin)
+MKSHLIB := $(CC) -fPIC -flat_namespace -undefinedsuppress -dynamic -dynamic-lib
+LDFLAGS += -flat_namespace
+else
+MKSHLIB                := $(CC) -fPIC -shared
+endif
+
DEP            := $(CXX)
LINKER         := $(CXX)
RANLIB         = ranlib
@@ -43,6 +50,12 @@
LNDIR          = $(shell pwd)/$(ROOT)/build/lndir.sh
CFLAGS         += -Wall
CXXFLAGS       += -Wall
+
+ifeq ($(BUILD_SHARED_LIBS),yes)
+CFLAGS   += -fPIC
+CXXFLAGS += -fPIC
+endif
+
DFLAG_INTEGRATED = -MMD
DEBUG_FLAG     = -g
COMPILE_SMALL_FLAG = -Os -fno-inline -fno-keep-static-consts

Best regards,
Byron Campen
Well, this appears to break the shared library build on OS X.(Missing libstdc++ symbols) I am trying to fix this. (This willrequire .dylib support from the build system)
Best regards,
Byron Campen
Hrm, looks like the object files need to be compiled with -fPICtoo. I will try the following slightly different patch:
Index: build/Makefile.tools
===================================================================
--- build/Makefile.tools        (revision 6598)
+++ build/Makefile.tools        (working copy)
@@ -43,6 +43,12 @@
LNDIR          = $(shell pwd)/$(ROOT)/build/lndir.sh
CFLAGS         += -Wall
CXXFLAGS       += -Wall
+
+ifeq ($(BUILD_SHARED_LIBS),yes)
+CFLAGS   += -fPIC
+CXXFLAGS += -fPIC
+endif
+
DFLAG_INTEGRATED = -MMD
DEBUG_FLAG     = -g
COMPILE_SMALL_FLAG = -Os -fno-inline -fno-keep-static-consts

Best regards,
Byron Campen
hi Byron

here is the error when building rutil shared:
gcc -fPIC -shared -o obj.debug.Linux.x86_64/librutil.soobj.debug.Linux.x86_64/AbstractFifo.o obj.debug.Linux.x86_64/BaseException.o obj.debug.Linux.x86_64/Coders.oobj.debug.Linux.x86_64/Condition.o obj.debug.Linux.x86_64/CountStream.o obj.debug.Linux.x86_64/Data.oobj.debug.Linux.x86_64/DataStream.o obj.debug.Linux.x86_64/DnsUtil.o obj.debug.Linux.x86_64/FileSystem.oobj.debug.Linux.x86_64/HeapInstanceCounter.oobj.debug.Linux.x86_64/Lock.o obj.debug.Linux.x86_64/Log.oobj.debug.Linux.x86_64/Logger.o obj.debug.Linux.x86_64/MD5Stream.o obj.debug.Linux.x86_64/Mutex.oobj.debug.Linux.x86_64/OpenSSLInit.o obj.debug.Linux.x86_64/ParseBuffer.o obj.debug.Linux.x86_64/Poll.oobj.debug.Linux.x86_64/RWMutex.o obj.debug.Linux.x86_64/Random.oobj.debug.Linux.x86_64/RecursiveMutex.o obj.debug.Linux.x86_64/SelectInterruptor.o obj.debug.Linux.x86_64/SHA1Stream.oobj.debug.Linux.x86_64/Socket.o obj.debug.Linux.x86_64/Subsystem.o obj.debug.Linux.x86_64/SysLogBuf.oobj.debug.Linux.x86_64/SysLogStream.o obj.debug.Linux.x86_64/ThreadIf.o obj.debug.Linux.x86_64/Timer.o obj.debug.Linux.x86_64/vmd5.o obj.debug.Linux.x86_64/dns/AresDns.oobj.debug.Linux.x86_64/dns/DnsAAAARecord.oobj.debug.Linux.x86_64/dns/DnsCnameRecord.oobj.debug.Linux.x86_64/dns/DnsHostRecord.oobj.debug.Linux.x86_64/dns/DnsNaptrRecord.oobj.debug.Linux.x86_64/dns/DnsSrvRecord.o obj.debug.Linux.x86_64/dns/DnsStub.o obj.debug.Linux.x86_64/dns/ExternalDnsFactory.oobj.debug.Linux.x86_64/dns/RRCache.o obj.debug.Linux.x86_64/dns/RRList.o obj.debug.Linux.x86_64/dns/RRVip.oobj.debug.Linux.x86_64/dns/QueryTypes.o obj.debug.Linux.x86_64/dns/RROverlay.o obj.debug.Linux.x86_64/stun/Stun.oobj.debug.Linux.x86_64/stun/Udp.o/usr/bin/ld: obj.debug.Linux.x86_64/AbstractFifo.o: relocationR_X86_64_32 against `a local symbol' can not be used when makinga shared object; recompile with -fPICobj.debug.Linux.x86_64/AbstractFifo.o: could not read symbols:Bad value
collect2: ld returned 1 exit status
make: *** [obj.debug.Linux.x86_64/librutil.so] Error 1


the system is Ubuntu 6.06 AMD64, g++ v4.0.3


my fix was to add the -fPIC compile flag:
(you should verify if this is correct)


--- build/Makefile.tools        (revision 6599)
+++ build/Makefile.tools        (working copy)
@@ -41,8 +41,8 @@
 DMANGLE                =
 INSTALL                = install
 LNDIR          = $(shell pwd)/$(ROOT)/build/lndir.sh
-CFLAGS         += -Wall
-CXXFLAGS       += -Wall
+CFLAGS         += -Wall -fPIC
+CXXFLAGS       += -Wall -fPIC
 DFLAG_INTEGRATED = -MMD
 DEBUG_FLAG     = -g
 COMPILE_SMALL_FLAG = -Os -fno-inline -fno-keep-static-consts


/alfred

Byron Campen wrote:
I see some logic in the build system that was meant tohandle this sort of thing, but it appears to not be working.Could you send the link-line?
Best regards,
Byron Campen
hi
when building resiprocate with "Should the resip libraries bebuilt
shared?" set to "Yes", I got the following error:


/usr/bin/ld: obj.debug.Linux.x86_64/AbstractFifo.o: relocation
R_X86_64_32 against `a local symbol' can not be used whenmaking a
shared object; recompile with -fPIC
obj.debug.Linux.x86_64/AbstractFifo.o: could not read symbols:Bad value
collect2: ld returned 1 exit status
make: *** [obj.debug.Linux.x86_64/librutil.so] Error 1
adding the "-fPIC" option solved the problem, but I am notsure if
this is the correct way to solve it.. patch below:


Index: build/Makefile.tools
===================================================================
--- build/Makefile.tools        (revision 6553)
+++ build/Makefile.tools        (working copy)
@@ -41,8 +41,8 @@
 DMANGLE                =
 INSTALL                = install
 LNDIR          = $(shell pwd)/$(ROOT)/build/lndir.sh
-CFLAGS         += -Wall
-CXXFLAGS       += -Wall
+CFLAGS         += -Wall -fPIC
+CXXFLAGS       += -Wall -fPIC
 DFLAG_INTEGRATED = -MMD
 DEBUG_FLAG     = -g
 COMPILE_SMALL_FLAG = -Os -fno-inline -fno-keep-static-consts


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_______________________________________________
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https://list.sipfoundry.org/mailman/listinfo/resiprocate-devel
_______________________________________________
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resiprocate-devel@xxxxxxxxxxxxxxxxxxx
https://list.sipfoundry.org/mailman/listinfo/resiprocate-devel

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References:
- [reSIProcate] building shared libraries on AMD64
  - From: Alfred E. Heggestad
- Re: [reSIProcate] building shared libraries on AMD64
  - From: Byron Campen
- Re: [reSIProcate] building shared libraries on AMD64
  - From: Alfred E. Heggestad
- Re: [reSIProcate] building shared libraries on AMD64
  - From: Byron Campen
- Re: [reSIProcate] building shared libraries on AMD64
  - From: Byron Campen
- Re: [reSIProcate] building shared libraries on AMD64
  - From: Byron Campen

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