LTTng » LTTng-tools

Jonathan Rajotte Julien wrote:

Hi,

Not sure if this a a lttng problem since AC_CHECK_LIB seems to be the preferred way to check for a lib¹².
Looks like the LDFLAGS_FOR_BUILD is defined but never passed to the configure script. I'm not familiar with the buildroot way of doing things could you explain a little more

In this build, Buildroot is cross-compiling lttng-tools.
LDFLAGS_FOR_BUILD (so, CFLAGS_FOR_BUILD and CXXFLAGS_FOR_BUILD) are used by autotools when building for the host/build machine, not the target.
LDFLAGS (so, CFLAGS and CXXFLAGS) are used by autotools when building for the target machine.

why the folder is not specified via the conventional LDFLAGS="-Ldir"?

In this case of static build, the problem is the LDFLAGS misses -lintl (which provides libintl_textdomain and other functions).
This flag is correctly set when using pkg-config --static --libs popt because popt.pc contains:

Libs.private: -lintl

[1]http://stackoverflow.com/questions/29506539/pkg-check-modules-vs-ac-check-lib-for-checking-availability-of-libraries
[2]http://stackoverflow.com/questions/10220946/pkg-check-modules-considered-harmful

Are you suggesting I should follow [2], i.e. use AC_CHECK_LIBS to detect the library presence, then PKG_CHECK_MODULE to get the flags, and AC_CHECK_LIBS again to check these flags? I can do that.

Thanks

Thanks