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toolchain: rework thread options

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The selection of linuxthreads, linuxthreads old or NPTL doesn't make a
lot of sense for external toolchains. So, instead, we :

 * Introduce an hidden BR2_TOOLCHAIN_HAS_THREADS option, which must be
   selected by toolchain specific options when thread support is
   available. Package needing to test thread support should use this
   option.

 * Move the none/linuxthreads/linuxthreads old/NPTL selection to
   Buildroot internal toolchain configuration.

 * Add an option in external toolchain to tell if thread support is
   available or not in the external toolchain. We assume that glibc
   without threads is not possible, as Ulrich Drepper said in
   http://sourceware.org/ml/libc-alpha/2005-08/msg00091.html

ffmpeg, dmalloc and openvpn are fixed to use the new
BR2_TOOLCHAIN_HAS_THREADS option. For openvpn, --enable-threads=posix
is no longer used, as the configure script doesn't even understand
this option.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
This commit is contained in:
Thomas Petazzoni
2010-12-13 17:27:44 +01:00
committed by Peter Korsgaard
parent a72a670489
commit 9eaad202f1
11 changed files with 62 additions and 48 deletions
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29
toolchain/toolchain-common.in
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@@ -26,6 +26,9 @@ config BR2_PROGRAM_INVOCATION
config BR2_INSTALL_LIBSTDCPP
bool
config BR2_TOOLCHAIN_HAS_THREADS
bool
config BR2_ENABLE_LOCALE_PURGE
bool "Purge unwanted locales"
help
@@ -76,32 +79,6 @@ config BR2_SOFT_FLOAT
functions, then everything will need to be compiled with soft
floating point support (-msoft-float).
choice
prompt "Thread library implementation"
default BR2_PTHREADS_OLD
help
If you are building your own toolchain then select the type of
libpthreads you want to use.
Not all thread variants work with all versions of uClibc,
the "linuxthreads (stable/old)" may be a working fallback
if you need threading at all.
If you have an external binary toolchain then select the type
of libpthreads it was built with.
config BR2_PTHREADS_NONE
bool "none"
config BR2_PTHREADS
bool "linuxthreads"
config BR2_PTHREADS_OLD
bool "linuxthreads (stable/old)"
config BR2_PTHREADS_NATIVE
bool "Native POSIX Threading (NPTL)"
depends on BR2_UCLIBC_VERSION_SNAPSHOT
endchoice
config BR2_TARGET_OPTIMIZATION
string "Target Optimizations"
default "-pipe"