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cross compiling howto for mips-openwrt-linux
by Attila Lendvai 24 Sep '15

24 Sep '15

hi! with the invaluable help of jackdaniel on #ecl, i've managed to cross compile ecl for mips-openwrt-linux. unfortunately i cannot edit the wiki at, so i'll write it up here. (if anyone reads it an can give me rights, my user is attila.lendvai) FTR, https://gitlab.com/embeddable-common-lisp/ecl/wikis/home the bird's eye view: - first you need to compile ecl on the host, but making sure that some important variables are the same as on the target (e.g. 32/64 bit; long long support; what else?). - then make clean, and configure the source tree for the target - ./configure will fail when run for the first time. you'll then need to edit 'build/cross_config' to set some variables regarding the target that cannot be detected automatically from the host. - then build it once again using a cross-compiling gcc - if you are not planning to have a gcc on the target, then configure the target with --with-bytecmp=builtin --with-cmp=no compile for the host: - you may need 32 bit support: sudo apt-get install gcc-multilib - CFLAGS=-m32 LDFLAGS=-m32 ABI=32 ./configure --prefix=/opt/ecl-host --enable-longdouble=no - make -j2 - make install compile for the target: make clean export STAGING_DIR=/home/alendvai/workspace/OpenWrt-SDK-ar71xx-generic_gcc-4.8-linaro_uClibc-0.9.33.2.Linux-x86_64/staging_dir export TOOLCHAIN=${STAGING_DIR}/toolchain-mips_34kc_gcc-4.8-linaro_uClibc-0.9.33.2/ export TARGETROOT=${STAGING_DIR}/target-mips_34kc_uClibc-0.9.33.2/ PATH=/opt/ecl-host/bin/:${TOOLCHAIN}/bin:${PATH} \ CFLAGS="-I${TOOLCHAIN}/include -I${TARGETROOT}/usr/include" \ LDFLAGS="--sysroot=${TARGETROOT}" ./configure \ --prefix=/opt/ecl-mips --disable-longdouble \ --with-libffi-prefix=${TARGETROOT} \ --host=mips-openwrt-linux --with-system-gmp optionally add: --with-bytecmp=builtin --with-cmp=no edit 'build/cross_config' and restart the above once again. (in this specific case i had to ECL_BIGENDIAN=yes) PATH=/opt/ecl-host/bin/:${TOOLCHAIN}/bin:${PATH} make -j2 copy /opt/ecl-mips to your openwrt and don't forget to: opkg install libgmp opkg install libffi i will try to put together an openwrt package, too. -- • attila lendvai • PGP: 963F 5D5F 45C7 DFCD 0A39 -- “People get used to anything. The less you think about your oppression, the more your tolerance for it grows. After a while, people just think oppression is the normal state of things. But to become free, you have to be acutely aware of being a slave.” — Assata Shakur (1947–), 'Assata: An Autobiography'

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[C99][Question]
by Daniel Kochmański 22 Sep '15

22 Sep '15

Dear all, I've got a question - does anyone really depend on a non-C99 compliant compiler? MSVC supports C99 from 2013 [1], GCC has complete support from 4.5 [2] (with various bits earlier), TCC also has everything except complex numbers [3] (what is on their TODO) and Clang has complete support [4]. I'm asking this question because we're considering making C99-supporting compiler as a dependency for ECL C backend. This will relieve us from writing backward-compatible workarounds for the older standard and will simplify the code. That also means, that various improvements will be possible and code will be easier to maintain. Best regards, Daniel [1] http://blogs.msdn.com/b/vcblog/archive/2013/07/19/c99-library-support-in-vi… [2] https://gcc.gnu.org/c99status.html [3] http://repo.or.cz/w/tinycc.git/blob/HEAD:/TODO [4] http://clang.llvm.org/docs/UsersManual.html#id43 -- Daniel Kochmański | Poznań, Poland ;; aka jackdaniel "Be the change that you wish to see in the world." - Mahatma Gandhi

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Safely calling lisp lambda function from C?
by bruce li 08 Sep '15

08 Sep '15

Hi, I'm writing a wrapper for a game engine that involves a few callbacks. I wrap the callback in a C function so that I can pass in lambdas as callbacks. Here is how the code looks like: cl_object callback_wrapper(cl_object lambda, cl_object ...) { cl_funcall(2, lambda, some_params); } It works OK if the passed in lambda function is syntactically correct. But it fails disastrously if the function contains errors, either syntactically or logically and it crashes the program. I wonder if it's possible to call the lambda function in a safer manner and when anything is wrong, it just drops to the top-level? A second question is... can I traverse lisp lists in C? I would like to collect everything into a C++ vector and pass that on to the engine's API. Thanks, Bruce

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email list subject line
by Daniel Herring 05 Sep '15

05 Sep '15

Hi all, The old mailing list had a "[Ecls-list]" prefix in the subject line. This was helpful for visually scanning a mailbox and could also be used for filter rules. The new list has no such prefix. Could someone add it? I don't care the exact format -- [Ecls-list], [ECL], whatever. I would just appreciate the addition. Thanks, Daniel

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[floats][infinity][C99]
by Daniel Kochmański 04 Sep '15

04 Sep '15

Hello, I'm little in doubt. Problem is related to ieee-floating-point extensions, which provide infinities and nan. Everything works fine until we generate C code, which simply breaks, because it isn't taken into account. There are two possible solutions: - for these cases use constant expressions, which trigger an error on some compilers, that is (0.0 / 0.0) for nan, (1.0 / 0.0) for infinity - use defined by C99 macros: INFINITY and NAN, which will work on any compiler supporting C99. Using the latter is clean and elegant, but raises requirements of ECL for C backend. Regarding compilers, C99 is considered complete since GCC 4.5 (and partly complete in previous versions), while MSVC implemented them with VS2013 (however ECL runs with bytecmp, so if no additional package using infinities is added during buildtime, there should be no problem with using previous versions). I'm writing to ML to ask your opionions - should we use these macros? Best regards, Daniel -- Daniel Kochmański | Poznań, Poland ;; aka jackdaniel "Be the change that you wish to see in the world." - Mahatma Gandhi

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Swank server dies with any error in REPL
by bruce li 04 Sep '15

04 Sep '15

Hi, there, I'm pretty new to ECL. I'm currently considering embedding ECL in a game engine. When I interactively interrupt the program and drop into the repl, I load up swank with quicklisp and create swank server with (swank:create-server :port 4005). I can connect to it from SLIME. But any error in the statement, either by deliberately typing sth wrong, will cause swank server to close instead of dropping into the debugging environment. I have no idea why this happens. It turns out that if I start swank on a different thread with mp:process-run-function, it goes well. But since the game engine is based on OpenGL, multithreading rendering isn't an option. I wonder if there is any way to get around the swank server and enable its debugger when it encounters error. Thanks, Bruce

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[ECL][16.0.0][Release]
by Daniel Kochmański 31 Aug '15

31 Aug '15

Dear all, since nothing serious came up, we are publishing a new release. Announcment: https://common-lisp.net/project/ecl/files/ecl-16.0.0-announcement.html Source distribution: https://common-lisp.net/project/ecl/files/ecl-16.0.0.tgz Windows binary installer: https://common-lisp.net/project/ecl/files/ecl-16.0.0-msvc-win32-installer.e… Enojoy! Best regards, Daniel Kochmański -- Daniel Kochmański | Poznań, Poland ;; aka jackdaniel "Be the change that you wish to see in the world." - Mahatma Gandhi

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[gmane]
by Daniel Kochmański 30 Aug '15

30 Aug '15

On the old mailing list Raymond asked, if I could subscribe new list to gmane. Already filed submission form, if someone is interested, gmane directory name will be "gmane.lisp.ecl.devel". Best regards, Daniel -- Daniel Kochmański | Poznań, Poland ;; aka jackdaniel "Be the change that you wish to see in the world." - Mahatma Gandhi

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The heap-size experimental branch
by Matthew Mondor 28 Aug '15

28 Aug '15

An experimental branch has been created called heap-size. The goal is for ECL to automatically resize the requested heap smaller, or to raise the soft OS process RLIMIT_DATA to satisfy the heap size. Without this, it's possible for ECL to freeze if it reaches the OS-imposed limit. The latest commit includes a message on how to test it: https://gitlab.com/embeddable-common-lisp/ecl/commit/a9f0539cea3f3b451007f8… Code testing and review is welcome. Notably hackish is heap_gap, which is a guess on the heap size ECL already needs other than the boehm-gc/general heap we're configuring with --heap-size. If it's always large enough, all should be fine, but if it's not, the freezing issue could still occur. There might be other ways to solve the freeze at the allocator or boehm-gc levels. However, it will still be useful for ECL to adapt the heap to the OS-imposed limit, and to adapt the soft OS limit to the heap ECL wants to use. This is unrelated to the new ECL release; once considered stable enough the heap-size branch should be merged on the develop branch. Thanks, -- Matt

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[release candidate][16.0.0-rc1]
by Daniel Kochmański 27 Aug '15

27 Aug '15

Dear all, release candidate ECL-16.0.0-rc1 has been published. All remarks and tests will be deeply appreciated (thanks!). Changes from last release can be found here: https://gitlab.com/embeddable-common-lisp/ecl/blob/develop/CHANGELOG Git repository addresses are (branch of interest is ECL-16.0.0-rc1): git@gitlab.com:embeddable-common-lisp/ecl.git https://gitlab.com/embeddable-common-lisp/ecl.git and downloadable tarball address is: https://common-lisp.net/project/ecl/files/ecl-16.0.0-rc1.tgz (in this directory all future releases will be stored and previous ones will be imported). I plan to describe changes in more detail in ECL Quarterly when finished. If no serious issues will come up next release is planned at 2015-08-28. Windows will have prebuilt version with MSVC. Best regards, Daniel Kochmański -- Daniel Kochmański | Poznań, Poland ;; aka jackdaniel "Be the change that you wish to see in the world." - Mahatma Gandhi

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