ltrace: Explicit enable/disable of libunwind

ltrace automatically uses libunwind if detected. So depending if libunwind was already compiled or not, ltrace compiles differently. This patch adds explicit dependency to libunwind if detected.

In add, due to limitation of uclibc, ltrace cannot use libunwind with uclibc. This patch explicitly compile without libunwind in this case.

Resolve issues detected here:

    http://autobuild.buildroot.net/results/79dae85647526cdeddae5050db0339fbc38c9ae6
    http://autobuild.buildroot.net/results/808569f6bfac059b57eb4f1e692fbc9909e791cf
    http://autobuild.buildroot.net/results/83d0cd13d64053869708c666e2aa533202af67f7

---
V2:
Previous version introduced an horrible bug: Usage of = instead of += on LTRACE_CONF_OPT. So, --disable-werror was no more passed to configure script. Thus, patches 2/3 and 3/3 are no more usefull. (Sorry, for the noise)

 package/ltrace/ltrace.mk |    7 +++++++
 1 file changed, 7 insertions(+)

index 7b8d859..4174139 100644
@@ -13,4 +13,11 @@ LTRACE_CONF_OPT = --disable-werror
 LTRACE_LICENSE = GPLv2
 LTRACE_LICENSE_FILES = COPYING
 
+ifeq ($(BR2_PACKAGE_LIBUNWIND)$(BR2_TOOLCHAIN_USES_GLIBC),yy)
+LTRACE_DEPENDENCIES += libunwind
+LTRACE_CONF_OPT += --with-libunwind
+else
+LTRACE_CONF_OPT += --without-libunwind
+endif
+
 $(eval $(autotools-package))

1.7.9.5

Dear J?r?me Pouiller,

Argh, sorry, this was too late. In the mean time, Gustavo submitted a similar patch, which I committed just minutes ago.

Thomas

Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com