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The build system uses the $(src-to-obj) function in multiple places to figure out the corresponding output object file for a certan source file, most importantly when generating the rule to build it. Usually this is pretty simple, but some odd cases are a little tricky... such as the auto-generated intermediary C files containing an array definition generated from an ASL file. These files have already been compiled per stage, so they contain the stage as a suffix and reside in the build directory (e.g. build/.../dsdt.ramstage.c). The previous $(src-to-obj) implementation just blindly appends the stage again and turns this into build/.../dsdt.ramstage.ramstage.o. This isn't very useful, so to avoid confusion this patch makes it strip additional stage suffixes for those intermediary files. This also fixes a bug with the ASL postprocessor, which didn't take this double suffix into account: it added build/.../dsdt.ramstage.o to ramstage-objs which should've been build/.../dsdt.ramstage.ramstage.o. This only worked by accident because make compiled the file with its implicit %.o: %.c rule instead. BRANCH=none BUG=chromium:466469 TEST=emerge-falco coreboot with the new make 4.1. Also build Falco and Veyron_Jerry with make -r -R to make sure there are no other accidental uses of implicit rules in our build system. Change-Id: I4aeaa60add1ef4215cb6c0b222c3886395c7a045 Signed-off-by: Patrick Georgi <pgeorgi@chromium.org> Original-Commit-Id: d9ea2e082eca1045409ea1f403082c97dedc70d8 Original-Change-Id: I951edbc9f653321a9084543a65009c6e9154d819 Original-Signed-off-by: Julius Werner <jwerner@chromium.org> Original-Reviewed-on: https://chromium-review.googlesource.com/259950 Original-Reviewed-by: Mike Frysinger <vapier@chromium.org> Original-Reviewed-by: Patrick Georgi <pgeorgi@chromium.org> Reviewed-on: http://review.coreboot.org/9861 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
------------------------------------------------------------------------------- coreboot README ------------------------------------------------------------------------------- coreboot is a Free Software project aimed at replacing the proprietary BIOS (firmware) found in most computers. coreboot performs a little bit of hardware initialization and then executes additional boot logic, called a payload. With the separation of hardware initialization and later boot logic, coreboot can scale from specialized applications that run directly firmware, run operating systems in flash, load custom bootloaders, or implement firmware standards, like PC BIOS services or UEFI. This allows for systems to only include the features necessary in the target application, reducing the amount of code and flash space required. coreboot was formerly known as LinuxBIOS. Payloads -------- After the basic initialization of the hardware has been performed, any desired "payload" can be started by coreboot. See http://www.coreboot.org/Payloads for a list of supported payloads. Supported Hardware ------------------ coreboot supports a wide range of chipsets, devices, and mainboards. For details please consult: * http://www.coreboot.org/Supported_Motherboards * http://www.coreboot.org/Supported_Chipsets_and_Devices Build Requirements ------------------ * gcc / g++ * make Optional: * doxygen (for generating/viewing documentation) * iasl (for targets with ACPI support) * gdb (for better debugging facilities on some targets) * ncurses (for 'make menuconfig') * flex and bison (for regenerating parsers) Building coreboot ----------------- Please consult http://www.coreboot.org/Build_HOWTO for details. Testing coreboot Without Modifying Your Hardware ------------------------------------------------ If you want to test coreboot without any risks before you really decide to use it on your hardware, you can use the QEMU system emulator to run coreboot virtually in QEMU. Please see http://www.coreboot.org/QEMU for details. Website and Mailing List ------------------------ Further details on the project, a FAQ, many HOWTOs, news, development guidelines and more can be found on the coreboot website: http://www.coreboot.org You can contact us directly on the coreboot mailing list: http://www.coreboot.org/Mailinglist Copyright and License --------------------- The copyright on coreboot is owned by quite a large number of individual developers and companies. Please check the individual source files for details. coreboot is licensed under the terms of the GNU General Public License (GPL). Some files are licensed under the "GPL (version 2, or any later version)", and some files are licensed under the "GPL, version 2". For some parts, which were derived from other projects, other (GPL-compatible) licenses may apply. Please check the individual source files for details. This makes the resulting coreboot images licensed under the GPL, version 2.