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| <== Date ==> | <== Thread ==> |
|---|
| Subject: | Re: Cross compiling |
| From: | "Johnson, Andrew N. via Tech-talk" <[email protected]> |
| To: | "[email protected]" <[email protected]> |
| Date: | Thu, 29 Aug 2019 19:23:58 +0000 |
|
Hi Florian, On 8/29/19 1:33 PM, Florian Feldbauer via Tech-talk wrote:
My configure/os/CONFIG_SITE.linux-x86-64.linux-arm looks like thisUSR_CFLAGS is used when compiling .c files to .o USR_CXXFLAGS is used when compling .cpp/.cxx/.cc flags to .o USR_LDFLAGS is used when linking .o files together into executables or libraries. It's the latter (link) stage that is failing in your build. Your first command is a compilation of a C file, which succeeds: /opt/iseg/cross-compiler/sysroots/x86_64-angstromsdk-linux/usr/bin/arm-angstrom-linux-gnueabi/arm-angstrom-linux-gnueabi-gcc -D_GNU_SOURCE -D_DEFAULT_SOURCE -march=armv7-a -mthumb -mfpu=neon -mfloat-abi=hard --sysroot=/opt/iseg/cross-compiler/sysroots/armv7at2hf-neon-angstrom-linux-gnueabi -DUNIX -Dlinux -O3 -g -Wall -march=armv7-a -mthumb -mfpu=neon -mfloat-abi=hard --sysroot=/opt/iseg/cross-compiler/sysroots/armv7at2hf-neon-angstrom-linux-gnueabi -fPIC -I. -I../O.Common -I. -I../../src/osi/compiler/gcc -I../../src/osi/compiler/default -I. -I../../src/osi/os/Linux -I../../src/osi/os/posix -I../../src/osi/os/default -I.. -I../../src/as -I../../src/bucketLib -I../../src/calc -I../../src/cvtFast -I../../src/cppStd -I../../src/cxxTemplates -I../../src/dbmf -I../../src/ellLib -I../../src/env -I../../src/error -I../../src/fdmgr -I../../src/flex -I../../src/freeList -I../../src/gpHash -I../../src/iocsh -I../../src/log -I../../src/macLib -I../../src/misc -I../../src/osi -I../../src/pool -I../../src/ring -I../../src/taskwd -I../../src/timer -I../../src/yacc -I../../src/yacc -I../../src/yajl -I/opt/epics/base/include/compiler/gcc -I/opt/epics/base/include/os/Linux -I/opt/epics/base/include -I/opt/epics/base/include/compiler/gcc -I/opt/epics/base/include/os/Linux -I/opt/epics/base/include -c ../../src/yajl/yajl_parser.c The next command is actually using g++ to link object files into a library (libCom.so.3.17.5), it isn't actually compiling anything, so it doesn't get given your $(USR_CXXFLAGS): You didn't set a variable to provide the linker flags needed for your build. Following your other settings that would be USR_LDFLAGS, but I would recommend that you actually set these variables instead:/opt/iseg/cross-compiler/sysroots/x86_64-angstromsdk-linux/usr/bin/arm-angstrom-linux-gnueabi/arm-angstrom-linux-gnueabi-g++ -o libCom.so.3.17.5 -shared -fPIC -L/opt/epics/base/lib/linux-arm -Wl,-rpath,/opt/epics/base/lib/linux-arm -rdynamic asLib.o asTrapWrite.o bucketLib.o postfix.o calcPerform.o cvtFast.o resourceLib.o epicsSingletonMutex.o dbmf.o ellLib.o ellSort.o envSubr.o envData.o errlog.o errSymLib.o errSymTbl.o fdmgr.o fdManager.o freeListLib.o gpHashLib.o iocsh.o initHooks.o registry.o libComRegister.o iocLog.o logClient.o macCore.o macEnv.o macUtil.o alarmString.o aToIPAddr.o adjustment.o cantProceed.o epicsConvert.o epicsExit.o epicsStdlib.o epicsString.o truncateFile.o ipAddrToAsciiAsynchronous.o epicsUnitTest.o epicsThread.o epicsMutex.o epicsEvent.o epicsTime.o epicsMessageQueue.o epicsMath.o epicsAtomicOSD.o epicsGeneralTime.o osiClockTime.o osdSock.o osdSockAddrReuse.o osiSock.o systemCallIntMech.o epicsSocketConvertErrnoToString.o osdAssert.o osdFindSymbol.o osdInterrupt.o osdPoolStatus.o osdSignal.o osdEnv.o epicsReadline.o epicsTempFile.o epicsStdio.o osdStdio.o osdThread.o osdThreadExtra.o osdThreadHooks.o osdMutex.o osdSpin.o osdEvent.o osdTime.o osdMonotonic.o osdProcess.o osdNetIntf.o osdMessageQueue.o devLibVME.o devLibVMEOSD.o epicsStackTrace.o osdBackTrace.o osdFindAddr.o poolJob.o threadPool.o epicsRingPointer.o epicsRingBytes.o taskwd.o epicsTimer.o timer.o timerQueue.o timerQueueActive.o timerQueueActiveMgr.o timerQueuePassive.o yajl.o yajl_alloc.o yajl_buf.o yajl_encode.o yajl_gen.o yajl_lex.o yajl_parser.o -lpthread -lreadline -lncurses -lm -lrt -ldl -lgccThe last command breaks because the --sysroot option is missing and the compiler doesn't find it's libraries. ARCH_DEP_CFLAGS = <your USR_CFLAGS value above> The ARCH_DEP_CXXFLAGS variable defaults to $(ARCH_DEP_CFLAGS) so you don't need to set this at all. ARCH_DEP_LDFLAGS = <flags to pass to g++ when using it as a linker> I'm suggesting you use the ARCH_DEP_ flags instead of the USR_ ones because some application Makefiles may override the USR_ variables instead of just appending to them, which would cause your builds to fail. Hope this helps, - Andrew -- Complexity comes for free, Simplicity you have to work for. |