Re: support for multithread-safe libraries

[Oskar Liljeblad]

On Thursday, July 14, 2005 at 16:14, Bruno Haible wrote:

> dnl Survey of platforms:
> dnl
> dnl Platform          Available   Compiler    Supports   test-lock
> dnl                   flavours    option      weak       result
> dnl ---------------   ---------   ---------   --------   ---------
> dnl Linux 2.4/glibc   posix       -lpthread   Y          OK
[..]

http://autoconf-archive.cryp.to/acx_pthread.html uses a set of
tests for pthread support. Some notes from it:

-lpthreads
  AIX (must check this before -lpthread)
(no flags)
  in case threads are in libc; should be tried before -Kthread and
  other compiler flags to prevent continual compiler warnings
-Kthread
  Sequent (threads in libc, but -Kthread needed for pthread.h)
-kthread
  FreeBSD kernel threads (preferred to -pthread since SMP-able)
-llthread
  LinuxThreads port on FreeBSD (also preferred to -pthread)
-pthread
  Linux/gcc (kernel threads), BSD/gcc (userland threads), etc.
-pthreads
  Solaris/gcc
-mthreads
  Mingw32/gcc, Lynx/gcc
-mt
  Sun Workshop C (may only link SunOS threads [-lthread], but it
  doesn't hurt to check since this sometimes defines pthreads too;
  also defines -D_REENTRANT)
--thread-safe
  KAI C++

GNU pth uses pth-config (or previously pthread-config) to determine
compiler and linker flags.

Does gcc prefer -pthread or -lpthread?

Regards,

Oskar Liljeblad (address@hidden)