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fftw's library name depends on the precision option. Consequently, it's possible to install multiple flavor on the same target. This patch breaks fftw double precision into a new package and: - makes BR2_PACKAGE_FFTW_PRECISION_DOUBLE select BR2_PACKAGE_FFTW_DOUBLE to keep compatibility with packages that use BR2_PACKAGE_FFTW_PRECISION_DOUBLE. This option will be removed in a follow-up commit; - removes BR2_PACKAGE_FFTW_USE_SSE2 since it is only used for single and double precision. The corresponding options are directly handled in fftw-double package; - makes fftw depend on fftw-double when this package is enabled; - turns fftw itself into a generic-package instead of an autotools-package: it no longer builds anything and only allows to trigger the build of the appropriate fftw-* sub-packages, as a temporary compatibility mechanism. Signed-off-by: Gwenhael Goavec-Merou <gwenhael.goavec-merou@trabucayre.com> [Yann/Thomas: - Use FFTW_DOUBLE_DL_SUBDIR to avoid downloading fftw multiple times - Minor reformatting tweaks in fftw-double.mk - Drop from fftw.mk FFTW_CONF_ENV/FFTW_CONF_OPTS which are no longer used - Make fftw a generic package so that its dependencies are built - Do not deprecate BR2_PACKAGE_FFTW_PRECISION_DOUBLE and instead make it select BR2_PACKAGE_FFTW_DOUBLE, so that packages using BR2_PACKAGE_FFTW_PRECISION_QUAD continue to work.] Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com> Tested-by: "Yann E. MORIN" <yann.morin.1998@free.fr> Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Buildroot is a simple, efficient and easy-to-use tool to generate embedded Linux systems through cross-compilation. The documentation can be found in docs/manual. You can generate a text document with 'make manual-text' and read output/docs/manual/manual.text. Online documentation can be found at http://buildroot.org/docs.html To build and use the buildroot stuff, do the following: 1) run 'make menuconfig' 2) select the target architecture and the packages you wish to compile 3) run 'make' 4) wait while it compiles 5) find the kernel, bootloader, root filesystem, etc. in output/images You do not need to be root to build or run buildroot. Have fun! Buildroot comes with a basic configuration for a number of boards. Run 'make list-defconfigs' to view the list of provided configurations. Please feed suggestions, bug reports, insults, and bribes back to the buildroot mailing list: buildroot@buildroot.org You can also find us on #buildroot on Freenode IRC. If you would like to contribute patches, please read https://buildroot.org/manual.html#submitting-patches