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Cross-compile libcurl for embedded arm target running freeRtos and LWIP stack

From: Gianfilippo Fornaro via curl-library <curl-library_at_cool.haxx.se>
Date: Thu, 24 Aug 2017 21:20:11 +0000 (UTC)

Hi everybody,

What I want to do is compile libcurl library for my target platform: an arm microcontroller from NXP based on a arm-cortex-m4, 32bit, flash ram and flash rom are not a concern.I need to do this beacause I need to use an other library which requests an https-client "object" providing a suitable interface. So whilst I am "only" in the need to provide it an https-client, that library do provide not only an interface but also an implementation of this client using libcurl. So at a first glance it seems that cross-compile libcurl will worth the work.
-As an environment system, I can use either windows7(64bit) or ubuntu 16(64bit).-The toolchain is the arm-none-eabi one, but NXP has made a redlib.spec custom C library that is used in C projects (it is passed to compiler trough -spec=redlib.spec; see https://community.nxp.com/thread/389152%c2†)-As a cryptoghraphic library I will use mbedTLS.-libcurl version¬†curl-7.55.0
AFAIK libcurl does not need an OS to run, but a TCP-IP stack that can provide unix-like network api. Morover I read that with the proper optimization it has a little foot-print.
I think I have detected two distinct ways to try to achive my goal.
I here try to well describe them both, guessing to collect as much advaices as I can from you.

1) Linux env(to semplify stuff). Build libcurl from sources using make build, preparing a cross-compile environment for make configure step and use the LWIP stack.
2) In mcuExpresso IDE, which is actually the IDE of NXP, a flavour of  Eclipse, import the libcurl source code, do some code tailoring keeping only the code that I really need. Let the IDE do the compilation.

If you have any suggestion about any other ways, please do inform me.

Till now I tried only point 1) with no success.
To accomplish it I did the following: prepared a library (libProject_prova1.a) from freeRtos + LWIP + drivers sources. Then I used libProject_prova1.a  in the make configuration step as the library to link against in order to let libcurl find all the network and 'system' api it needs along with the redlib.spec .
What I obtained is:

--------------------------------------------------------------------------------------------------------------------------------------------------------------------------checking forgrep.../bin/grep
checking foregrep.../bin/grep -E
checking fora BSD-compatible install.../usr/bin/install -c
checking forarm-none-eabi-gcc...arm-none-eabi-gcc
checking whether the C compiler works...no
configure:error:in `/home/user/Desktop/curl_libProject_prova1/curl-7.55.0':configure:error:C compiler cannot create executables See`config.log' for more details --------------------------------------------------------------------------------------------------------------------------------------------------------------------------And the config.log shows the following:
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------configure:4781:checking whether the C compiler works
configure:4803:arm-none-eabi-gcc -O0 -fno-common -g3 -Wall-c -fmessage-length=0-fno-builtin -ffunction-sections -fdata-sections -mcpu=cortex-m4 -mfpu=fpv4-sp-d16 -mfloat-abi=hard -mthumb --specs=redlib.specs -D__REDLIB__ -DUSE_LWIPSOCK -DLWIP_DNS=1-DUSE_RTOS=1-DCR_INTEGER_PRINTF -DSDK_DEBUGCONSOLE=0-D__MCUXPRESSO -D__USE_CMSIS -DNDEBUG -DFSL_RTOS_FREE_RTOS -DSDK_OS_FREE_RTOS -DCPU_LPC54608J512ET180 -DCPU_LPC54608J512ET180_cm4 -I/home/user/Documents/MCUXpresso_10.0.2_411/workspace/libProject_prova1/lwip/src/include/lwip -I/home/user/Documents/MCUXpresso_10.0.2_411/workspace/libProject_prova1/lwip/src/include/lwip/priv -I/home/user/Documents/MCUXpresso_10.0.2_411/workspace/libProject_prova1/lwip/src/include/lwip/prot -I/home/user/Documents/MCUXpresso_10.0.2_411/workspace/libProject_prova1/lwip/src/include/netif -I/home/user/Documents/MCUXpresso_10.0.2_411/workspace/libProject_prova1/lwip/src/include/netif/ppp -I/home/user/Documents/MCUXpresso_10.0.2_411/workspace/libProject_prova1/lwip/src/include/netif/ppp/polarssl -I/home/user/Documents/MCUXpresso_10.0.2_411/workspace/libProject_prova1/lwip/src/include/posix -I/home/user/Documents/MCUXpresso_10.0.2_411/workspace/libProject_prova1/lwip/src/include/posix/sys -I/home/user/Documents/MCUXpresso_10.0.2_411/workspace/libProject_prova1/lwip/port -I/home/user/Documents/MCUXpresso_10.0.2_411/workspace/libProject_prova1/lwip/port/arch -I/home/user/Documents/MCUXpresso_10.0.2_411/workspace/libProject_prova1/lwip/src -I/home/user/Documents/MCUXpresso_10.0.2_411/workspace/libProject_prova1/lwip/src/include -I/home/user/Documents/MCUXpresso_10.0.2_411/workspace/libProject_prova1/lwip/src/netif -I/home/user/Documents/MCUXpresso_10.0.2_411/workspace/libProject_prova1 -I/home/user/Documents/MCUXpresso_10.0.2_411/workspace/libProject_prova1/drivers -I/home/user/Documents/MCUXpresso_10.0.2_411/workspace/libProject_prova1/utilities -I/home/user/Documents/MCUXpresso_10.0.2_411/workspace/libProject_prova1/freertos -I/home/user/Documents/MCUXpresso_10.0.2_411/workspace/libProject_prova1/CMSIS -I/home/user/Documents/MCUXpresso_10.0.2_411/workspace/libProject_prova1/startup -I/home/user/Desktop/mbed_TLS_NXP/build/include/mbedtls -L/home/user/Desktop/mbed_TLS_NXP/build/lib -L/home/user/Documents/MCUXpresso_10.0.2_411/workspace/libProject_prova1/Releaseconftest.c -lProject_prova1 >&5configure:4807:$?=0configure:4845:result:no
configure:failed program was:|/* confdefs.h */|#definePACKAGE_NAME "curl"|#definePACKAGE_TARNAME "curl"|#definePACKAGE_VERSION "-"|#definePACKAGE_STRING "curl -"|#definePACKAGE_BUGREPORT "a suitable curl mailing list: https://curl.haxx.se/mail/"|#definePACKAGE_URL ""|/* end confdefs.h. */||intmain (void)|{||;|return0;|}configure:4850:error:in `/home/user/Desktop/curl_libProject_prova1/curl-7.55.0':configure:4852:error:C compiler cannot create executables See`config.log' for more details
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------
I dont understand where the problem is.The configuration script is:

--------------------------------------------------------------------------------------------------------------------------------------------------------------------------#! /bin/shexportPATH=/usr/local/mcuxpressoide-10.0.2_411/ide/tools/bin:$PATH
PATH=/home/user/Documents/MCUXpresso_10.0.2_411/workspace/libProject_prova1/Release:$PATH exportROOTDIR="${PWD}"exportMBEDDIR=/home/user/Desktop/mbed_TLS_NXP/build exportPROJDIR=/home/user/Documents/MCUXpresso_10.0.2_411/workspace/libProject_prova1cd ./curl-7.55.0
exportCPPFLAGS="-DUSE_LWIPSOCK -D__REDLIB__ -DLWIP_DNS=1 -DUSE_RTOS=1 -DCR_INTEGER_PRINTF -DSDK_DEBUGCONSOLE=0 -D__MCUXPRESSO -D__USE_CMSIS -DNDEBUG -DFSL_RTOS_FREE_RTOS -DSDK_OS_FREE_RTOS -DCPU_LPC54608J512ET180 -DCPU_LPC54608J512ET180_cm4 -I${PROJDIR}/lwip/src/include/lwip -I${PROJDIR}/lwip/src/include/lwip/priv -I${PROJDIR}/lwip/src/include/lwip/prot -I${PROJDIR}/lwip/src/include/netif -I${PROJDIR}/lwip/src/include/netif/ppp -I${PROJDIR}/lwip/src/include/netif/ppp/polarssl -I${PROJDIR}/lwip/src/include/posix -I${PROJDIR}/lwip/src/include/posix/sys -I${PROJDIR}/lwip/port -I${PROJDIR}/lwip/port/arch -I${PROJDIR}/lwip/src -I${PROJDIR}/lwip/src/include -I${PROJDIR}/lwip/src/netif -I${PROJDIR} -I${PROJDIR}/drivers -I${PROJDIR}/utilities -I${PROJDIR}/freertos -I${PROJDIR}/CMSIS -I${PROJDIR}/startup -I${MBEDDIR}/include/mbedtls"exportCFLAGS="-O0 -fno-common -g3 -Wall -c -fmessage-length=0 -fno-builtin -ffunction-sections -fdata-sections -mcpu=cortex-m4 -mfpu=fpv4-sp-d16 -mfloat-abi=hard -mthumb -specs=redlib.specs"exportLDFLAGS="-L${MBEDDIR}/lib -L${PROJDIR}/Release"exportLIBS="-lProject_prova1"exportCROSS_COMPILE=arm-none-eabi exportAR=${CROSS_COMPILE}-ar exportAS=${CROSS_COMPILE}-as exportLD=${CROSS_COMPILE}-ld exportRANLIB=${CROSS_COMPILE}-ranlib exportCC=${CROSS_COMPILE}-gcc exportNM=${CROSS_COMPILE}-nm exportPREFIX=${ROOTDIR}/build ./configure --target=${CROSS_COMPILE}--host=${CROSS_COMPILE}--prefix=${ROOTDIR}/build --build=x86_64-linux-gnu --without-ssl --with-mbedtls --enable-static--disable-shared --disable-ftp --disable-file --disable-pop3 --disable-smb --disable-smtp --disable-imap --disable-ldap --disable-ldaps --disable-dict --disable-telnet --disable-tftp --disable-manual --disable-ipv6 --disable-unix-sockets --disable-versioned-symbols --disable-ares --disable-sspi --disable-gopher --without-zlib --without-libssh2 --without-ca-bundle -without-ca-path --without-libidn --without-librtmp --without-libidn--------------------------------------------------------------------------------------------------------------------------------------------------------------------------Can anyone figures out what I am doing wrong?

If I procede with the 2) way, I would ask how can I set/unset all the features that I can choose using directives like -without-ssl --with-mbedtls --enable-static--disable-shared in the configure step?
From whitch file do I need to start to tailor libcurl to fit my needs?

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Received on 2017-08-24