Re mk cross compile fixes #62
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One solution for cross-compiling rem and baresip is to specify LIBRE_INC and LIBRE_SO. The problem was that re.mk always cleared these variables, then detected re.h/libre.so in /usr/local or /usr and set LIBRE_INC and LIBRE_SO to these system paths.
A simpler way for cross compilation could be to set LIBRE_PATH externally. This commit prevents that LIBRE_PATH is overwritten by re.mk and sets LIBRE_INC and LIBRE_SO correctly by means of LIBRE_PATH. These variables are added to the CFLAGS resp. to the "-L" argument of the linker command in baresip and rem Makefile.
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These days again we are playing around with optimizing/simplifying our yocto recipes. Same for a very old buildroot system. We always run in problems that libre is detected on the build/devel host and paths are set in-correctly.
This two commits repair two possibilities to set the paths to libre, which we think solve cross compilation problems.
If the user previously set one of these variables, it had no result.
With this patches it may often be enough to set CC and SYSROOT correctly for cross compilation. Maybe in addition SYSROOT_ALT. Also DESTDIR for the install target dir.