I figured out what was causing the linking problems. It turns out that
doing an "osc build" sets the environment variable "LD_AS_NEEDED", which
causes the linker ot behave as if "--as-needed" were given in the
command line. We are using cmake, and give the X libraries using the
following line in CMakeLists.txt:
set(CMAKE_EXE_LINKER_FLAGS "-lX11 -lXtst -lXi")
This produces the offending command line in Makefile:
/usr/bin/gcc -Wall -m32 -lX11 -lXtst -lXi
CMakeFiles/fala_pixelchanged.dir/main.c.o -o fala_pixelchanged
The reason for the linker complaints is that the X libraries precede
main.c.o in the command line. At the point where the linker sees the
libraries, there are no references to symbols in them, so the linker
just discards the libraries.
What had me baffled for a while was that doing an "osc chroot" into the
build and running "make" there produced no complaints from the linker
even though the command lines were identical. If at all possible, it
would be nice to have "--as-needed" as an explicit linker flag instead
of magically modifying the linker's default behavior with an environment
variable.
--
Pertti
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