Since I installed gcc-49 on my Mac I can't get Homebrew to find the C++ compiler anymore. It always fails with error messages like:
configure: error: C++ preprocessor "/lib/cpp" fails sanity check
Running "brew upgrade -v" spits out this:
...
==> ENV
HOMEBREW_CC: llvm-gcc
HOMEBREW_CXX: llvm-g++
...
I have no idea why Homebrew wants to use these compilers. Why can't it use the normal CC/CXX environment variables like everything else?
I already found, that by editing the formula directly like described in Using Homebrew with alternate GCC, I can change the HOMEBREW_CXX to use /usr/local/bin/g++ for example, which makes compiling formulas that need C++ work again.
But I don't want to edit every single formula by hand for the rest of my days. How can I change this HOMEBREW_CXX environment variable permanently? I tried setting them in my .bash_profile and running "export HOMEBREW_CXX=..." in the console and neither of those work, only editing the formula directly.
Does anyone have an idea?
A poor man's solution, to be sure, but this works: put an alias in your .bashrc or .bash_profile:
alias brew='HOMEBREW_CC=gcc-4.8 HOMEBREW_CXX=g++-4.8 brew'
Now, whenever you use brew it will use the compilers you want. Check that it works by doing:
brew --env
HOMEBREW_CC: gcc-4.8
HOMEBREW_CXX: g++-4.8
...
HTH
Related
I have an OCaml program that worked fine on Ubuntu 16 but when recompiled and run on Ubuntu 20 I get the following error:-
$ ocamldebug ./linearizer
OCaml Debugger version 4.08.1
(ocd) r
Loading program... done.
Time: 89534
Program end.
Uncaught exception: Sys_error "Illegal seek"
(ocd) b
Time: 89533 - pc: 624888 - module Netaccel_link
No source file for Netaccel_link.
I thought this was due to missing dev libraries but:-
$ sudo apt install libocamlnet-ocaml-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
libocamlnet-ocaml-dev is already the newest version (4.1.6-1build6).
0 upgraded, 0 newly installed, 0 to remove and 20 not upgraded.
What setup step am I missing on Ubuntu 20?
This looks like a regression bug in libocamlnet and you should report an issue there or, I am a bit pessimistic that you will get any response, you can try to debug the issue yourself.
The problem that you are facing has nothing to do with missing libraries (they will be reported during installation or, if the package is broken, end up in linker errors). It may result, however, from some misconfiguration of the system. If that is true, then you're lucky as you can fix it yourself.
I will give you some advice that might help you in debugging this issue. For more, please try using discuss.ocaml.org as a more suitable media (SO doesn't favor this kind of a discussion and we might get deleted by admins).
The illegal seek exception is thrown when the seek operation is applied on a non-regular file, aka ESPIPE Unix error. So check your inputs. It could be that what was previously regarded as a file in Ubuntu is now a pipe or a socket.
Try to use ltrace or strace to pinpoint the culprit e.g.,
ltrace ./linearizer
or, if it overwhelms you, try strace
strace ./linearizer
Instead of using ocamldebug you can use plain gdb. You can use gdb's interfaces to provide the path to the source code (though most likely it won't work since ocamlnet is not compiled with debug information). I believe that it will give you a more meaningful backtrace.
Instead of using the system installation try using opam. Install your dependencies with opam and try older versions as well as newer versions of the OCaml compiler. Also, try different versions of ocamlnet. Ideally, try to reproduce the environment that used to work for you.
When nothing else works, you can use objdump -d and look at the disassembly of your binary. OCaml is using a pretty readable and intuitive name mangling scheme (<module_name>__<function_name>_<uid>), so you can easily find the source code (search for <module_name>.ml file and look for the <function_name> there)
Finally, just use docker or any other container to run your application. Consider switching from ocamlnet to something more modern and supported.
When trying to compile Fortran using PGI on Mac OS X Sierra, I get the error
ld: file not found: /usr/lib/crt1.o
I found a workaround for older Mac OS X versions (http://www.pgroup.com/userforum/viewtopic.php?t=4578)
sudo ln -s /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/usr/lib/crt1.o /usr/lib/crt1.o
However, with Sierra, System Integrity Protection prevents writing in /usr/bin. How can I solve this problem?
I tried linking into /usr/local/bin/ (which is permitted), but then, how can I make sure the compiler searches for library in that path?
Installing just the Command Line Tools for Mac OS X solved the problem. Do this in your terminal:
xcode-select --install
Installing Lazarus on MacOS X :
worked for me
http://wiki.lazarus.freepascal.org/Installing_Lazarus_on_MacOS_X#Xcode_5.0.2B_compatibility_.28Mac_OS_X_10.8_and_10.9.29
Solution for command line programs:
The correct answer for me was as explained in this link:
https://medium.com/#kviat/free-pascal-3-0-2-linking-on-macos-sierra-c40706e86fda
After some googling I realized that most libraries were removed from
/usr/lib in macOS Sierra. However this case is handled in FPC, so we
just need to set internal compiler variable MacOSXVersionMin to 10.8
(or later). There is no standard compiler option for it, but after
some search in source code I found the solution: set the environment
variable MACOSX_DEPLOYMENT_TARGET:
You should give the deployment target of MacOS:
MACOSX_DEPLOYMENT_TARGET= XX.XX #for instance 10.15
Solution for generally:
Linking the necessary file to /usr/bin/crt* . As already stated, this linking will be prohibited by MacOs beginning from 10.10. But there is still a way to accomplish this linking procedure and it solves the problem.
1) Reboot the Mac and hold down Command + R keys simultaneously after you hear the startup chime, this will boot Mac OS X into Recovery Mode
2) When the “MacOS Utilities” / “OS X Utilities” screen appears, pull down the ‘Utilities’ menu at the top of the screen instead, and choose “Terminal”
3) Type the following command into the terminal then hit return:
csrutil disable; reboot
4) When you come back, run the command sudo mount -uw /
5) Just run the linking code you want to:
sudo ln -s /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/usr/lib/crt1.o /usr/lib/crt1.o
sources: http://osxdaily.com/2015/10/05/disable-rootless-system-integrity-protection-mac-os-x/
https://www.reddit.com/r/MacOS/comments/caiue5/macos_catalina_readonly_file_system_with_sip/
In my case the problem was actually an error on the PGI installation side. PGI seems to be well aware that newer versions of macOS do not have the /usr/lib/crt1.o and that you can't create files there anymore. But it is possible to setup correct environment variables for the PGI compilers and then the linker should use the correct path to the crt1.o.
This configuration should be done automatically during the installation of the PGI compiler suite by running the makelocalrc command and should generate the file /opt/pgi/osx86-64/$PGIVER/bin/localrc. But in my case this step failed silently.
Reasons for failure seem to be:
license agreement for XCode not (yet) accepted, although this error should leave you with a /opt/pgi/osx86-64/$PGIVER/bin/localrc.error, containing some details
XCode version not supported, which seems to leave you with nothing. This is what I got when I ran the makelocalrc script manually:
makelocalrc -x /opt/pgi/osx86-64/19.10
Error: Unsupported XCode version 11
In my case (PGI 19.10, macOS 10.15, XCode 11.2.1) I manually patched the /opt/pgi/osx86-64/19.10/bin/makelocalrc to not error out on XCode 11:
if test $xcodever -gt 11 ; then # <-- was "-gt 10"!
echo " Error: Unsupported XCode version " $xcodever
exit -1
fi
and then re-ran the script after which compilation with PGI compilers (both pgcc and pgfortran) worked:
sudo /opt/pgi/osx86-64/2019/bin/makelocalrc -x /opt/pgi/osx86-64/19.10
Your case may vary, but you might want to check for a /opt/pgi/osx86-64/$PGIVER/bin/localrc.error or the /opt/pgi/osx86-64/$PGIVER/bin/localrc itself and try to manually (re-) generate it if it is not there or if you upgraded XCode/macOS since the installation of the PGI compilers.
I have installed LLVM3.6 on my Ubuntu 14.04 machine. I have also set the path for
LLVM_PATH_DOT=/usr/bin/dot and later on LLVM_PATH_DOT=/usr/bin/dotty.
I also tried to check LLVM_ENABLE_DOXYGEN during CMake configuration, and gave the path for DOTTY. It also doesn't work.
Lastly, I created a new entry in CMAKE, called LLVM_PATH_DOTTY, and supplied in the path. It also doesn't work.
When I try to create the DAG output for a .ll file, llc neither gives any error message nor prints a graph.
I pass in the following command:
llc -view-dag-combine-lt-dags foo.ll
How can I solve this problem? Thank you
If you're using LLVM 3.6.x or earlier, you have to also specify the -filter-view-dags=<bb-name> option to specify the name of the basic block which you wish to view.
This was unintended behaviour (omitting the flag is meant to mean "view all basic blocks", not "view none of the basic blocks"). The bug was fixed in LLVM 3.7. If you want to manually apply the patch which fixes this, see this mailing list post for details: http://lists.llvm.org/pipermail/llvm-dev/2015-July/088631.html
I have just downloaded clang 3.3 (homebrew) from the LLVM web page to my mac (OS X 10.8.4), but get this compiler error when using std=c++11 stdlib=libc++:
In file included from /usr/include/c++/v1/string:434:
In file included from /usr/include/c++/v1/algorithm:594:
In file included from /usr/include/c++/v1/memory:590:
In file included from /usr/include/c++/v1/typeinfo:61:
/usr/include/c++/v1/exception:146:5: error: an attribute list cannot appear here
_LIBCPP_NORETURN friend void rethrow_exception(exception_ptr);
^~~~~~~~~~~~~~~~
/usr/include/c++/v1/__config:190:28: note: expanded from macro '_LIBCPP_NORETURN'
# define _LIBCPP_NORETURN [[noreturn]]
^~~~~~~~~~~~
It seems that I also need another libc++ (even though it was said that it was 100% complete on MAC ...), but I cannot find any. Any help appreciated. Just for your info:
> clang++ -v
clang version 3.3 (tags/RELEASE_33/final)
Target: x86_64-apple-darwin12.4.0
Thread model: posix
And, yes, I googled it and found this: http://comments.gmane.org/gmane.comp.compilers.llvm.bugs/24138 claiming it's resolved in libc++ trunk ???
Okay, as suggested by Howard, I've downloaded tip-of-the-trunk libc++ into /opt/local/share/libcxx, but have trouble building it. The manual says to cd libcxx/lib, export TRIPLE=-apple-, and run ./buildit. I presume this implies bash (I'm usually a tcsh user, so I moved my .tcshrc, got a new shell and started bash). I did that and the compilations worked, but the library build failed. Apparently ./buildit doesn't see $TRIPLE=-apple-, as it picks the wrong LDSHARED_FLAG (not that on line 81, but that on line 103, which is to be used if $TRIPLE is not set), even though echo $TRIPLE yields -apple- as it should. When I add the statement echo TRIPLE = $TRIPLE at the top of buildit, it reports nothing. How come? What is wrong here?
The failure was that because the wrong LDSHARED_FLAG was picked the loading didn't work (ld complaint about the unknown option -soname which, I think, makes sense under linux). I don't know why buildit (a #! /bin/sh file) didn't pick up the TRIPLE environment variable (it did pick up several unwanted ones such as CXX and CC). I now simply added TRIPLE=-apple- at the top of that file and it did built the library. However, the loader spitted out several warnings all of which were of the form
ld: warning: direct access in ___cxa_bad_typeid to global weak symbol typeinfo for std::bad_typeid means the weak symbol cannot be overridden at runtime. This was likely caused by different translation units being compiled with different visibility settings.
But most importantly, it works (the compilation at least, I have yet to test the library). I have one final question. The advice was to use -I and -L to tell the compiler about the whereabouts of this version. Is it not possible to put it into the usual place /usr/include/c++/v1/? Note that Xcode has its version somewhere else anyway and I had put in a symbolic link (/usr/include/c++/v1/) to that one to get my homebrew clang 3.2 working (after the some Xcode update). What about the library? Can I also put it in a standard place?
Here is the home page of libc++:
http://libcxx.llvm.org
You can download the tip-of-trunk libc++ from there. You can tell clang to point to your download with -nostdinc++ -I<path-to-libc++>/include. You can also tell clang to link to your tip-of-trunk libc++ with -L<path-to-libc++>/lib and export DYLD_LIBRARY_PATH=<path-to-libcxx>/lib. The directions are all on the libc++ home page.
Xcode is the easiest way to get clang + libc++. But if you want the very latest, this is the place to go.
Congratulations!
Don't worry about the ld warning. It is a harmless ld bug that will be fixed in a future release. I see it on 10.8.4 too and it doesn't hurt anything.
The libc++ headers no longer live at /usr/include/c++/v1. Xcode has migrated them into itself. Having libc++ headers at /usr/include/c++/v1 from older installs has been a source of confusion and bugs. I regularly use -nostdinc++ -I to point to the libc++ headers I want (I often have several versions going at the same time), and that works well for me.
It is possible for you to replace your /usr/lib/libc++.1.dylib with that you have built. I do not recommend doing this. I have to sometimes to do a proper test, but I always do so very carefully because sometimes this causes me to have to reboot onto a backup disk and restore my /usr/lib to its original state. If you do go this route, it is a very good idea to have a backup of the original /usr/lib/libc++.1.dylib very handy.
I recommend instead -L on the command line, and export DYLD_LIBRARY_PATH=<path-to-libcxx>/lib in the shell. More than one person (including myself) has gotten their computer into a really nasty place by not following this advice.
If you run testit (under test/), all you need is DYLD_LIBRARY_PATH in that shell. The testit script is set up to point to the right places without an install.
Also I recommend figuring out why you had to modify buildit. No one else is seeing that behavior. printenv on your command line may help in this endeavor.
libc++ is updated often. We try to keep tip-of-trunk always in a shippable state.
I'd like to know in the code (.c file) how I can find the linux distribution name version (like ubuntu 10.0.4, or centOS 5.5...)?
The c function that I'm looking for should be like the uname() system call used in (.c files) to get kernel version.
it will be appreciated that the function is working for all linux distribution (standard)
I 'm not looking to get distribution name and version by the use of command line linux from code (.c file) (like the use of system("cat /etc/release");).
Any suggestion will be appreciated!
Regards
There is no standard for this yet. You can query following files or check for existence:
/etc/lsb-release
/etc/issue
/etc/*release
/etc/*version
Well, you can (and should) use fopen and fgets instead of system("cat"), for reading /etc/release.
There's no universal method though, I can even build a linux image which has no filesystem at all (except initramfs) and definitely no distribution name.
AFAIK there isn't a standard system call to get this if uname(2) doesn't give you enough info.
Safest approach is probably to check for "/proc/version" and read that
You could fopen("/etc/lsb-release") and parse its contents. It looks like this:
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=10.04
DISTRIB_CODENAME=lucid
DISTRIB_DESCRIPTION="Ubuntu 10.04.3 LTS"
This method is not universal. You'll need to make sure that it works on all distros that you care about (if it doesn't, I suggest you go with #ott--'s answer).
Is it acceptable to run some shell commands?
$ /usr/bin/lsb_release -r
Release: 11.04
$ /usr/bin/lsb_release -d
Description: Ubuntu 11.04
$ /usr/bin/lsb_release -rd
Description: Ubuntu 11.04
Release: 11.04
There is no portable way to do that, you'll have to use some OS detection tool/library.
Fortunately, there are a few out there. I know those 2 :
Facter, a professional (yet free/open) information gathering program in ruby : http://puppetlabs.com/puppet/related-projects/facter/
a shell script : http://www.novell.com/coolsolutions/feature/11251.html
(I used facter via puppet and it is very good.)
With a little additional scripting, you can use one of those program's output to generate a .h that you can then use in your code.
You can even integrate this generation as a step in your makefile.
I usually inspect /etc/issue; while (as others pointed out) it is not guaranteed, I've fount in the field that's quite reliable.
As far as I've experienced, it works on ubuntu, debian, redhat, centos, slackware and archlinux.