Fixing linking flag -lpthread -> -pthread so linking works under Linux Mint 17.2

[Qqwy]

I had problems with the compilation process. To be more exact, I encountered the following error:

$ ./build light strip
mkdir -p tmp/liba tmp/bobcat/ tmp/libso

Creating shared library libbobcat.so
g++ --std=c++14 -O2 -Wall -fdiagnostics-color=never -isystem tmp -fPIC -lpthread -shared -Wl,--as-needed,-z,defs,-soname,libbobcat.so.4 -o tmp/libso/libbobcat.so.4.04.00 */os/*.o 
process/os/60start2.o: In function `FBB::Process::start(FBB::ProcessEnums::IOMode, FBB::Process::ProcessType, unsigned long, unsigned long)':
start2.cc:(.text+0xda): undefined reference to `pthread_create'
sharedcondition/os/71condition1.o: In function `FBB::SharedCondition::Condition::Condition()':
condition1.cc:(.text+0x2f): undefined reference to `pthread_condattr_setpshared'
sharedmutex/os/73sharedmutex1.o: In function `FBB::SharedMutex::SharedMutex()':
sharedmutex1.cc:(.text+0x1d): undefined reference to `pthread_mutexattr_init'
sharedmutex1.cc:(.text+0x2a): undefined reference to `pthread_mutexattr_setpshared'
collect2: error: ld returned 1 exit status
Fatal: system - failure of system call (status 256)

After trying out some different things, I changed the -lpthread flag to -pthread. This works, at least on my architecture (Linux Mint 17.2, kernel: x86_64 Linux 3.16.0-38-generic). I expect this to work on other systems as well (But of course, please do test). See more information about the difference between the two flags here: http://stackoverflow.com/questions/23250863/difference-between-pthread-and-lpthread-while-compiling#23251828

🙂

~Wiebe-Marten

[Qqwy]

I have tried building master using the build libraries strip command as well (selecting all options except 'milter'), which went fine using this change.

As discussed by mail, I'll check the results with LDFLAGS = "". (Again, building all except milter)

[Qqwy]

All right. With LDFLAGS = "" it also works fine.

[fbb-git]

Dear Qqwy, you wrote:

All right. With `LDFLAGS = ""` it also works fine.

OK, thx for your help: I'll change it in the next distribution (at github already at the next commit, i.e., the one following the commit dated Fri Nov 25 11:02:35 2016 +0100 (99ca3d6)).

…

-- Frank B. Brokken Center for Information Technology, University of Groningen (+31) 50 363 9281 Public PGP key: http://pgp.surfnet.nl Key Fingerprint: DF32 13DE B156 7732 E65E 3B4D 7DB2 A8BE EAE4 D8AA