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* kbuild: simplify build, clean, modbuiltin shorthandsMasahiro Yamada2014-10-021-2/+2
| | | | | | | | | | | | | $(if $(KBUILD_SRC),$(srctree)/) was a useful strategy to omit a long absolute path for in-source-tree build prior to commit 890676c65d699db3ad82e7dddd0cf8fb449031af (kbuild: Use relative path when building in the source tree). Now $(srctree) is "." when building in the source tree. It would not be annoying to add "$(srctree)/" all the time. Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com> Signed-off-by: Michal Marek <mmarek@suse.cz>
* kbuild: Fix handling of backslashes in *.cmd filesMichal Marek2014-08-071-6/+8
| | | | | | | | | | | | | | | Commit c353acba ("kbuild: make: fix if_changed when command contains backslashes") attempted to handle backslashes in *.cmd files, but it only handled double backslashes for some reason. Changing make-cmd to also handle single backslashes fixes rebuilds with dash, but it breaks bash again. The reason is that the two shells disagree about the interpretation of backslash sequences in the echo builtin. The way out of this is to print the command with printf '%s\n'. While at it, document what the individual parts of make-cmd do and why. Reported-and-tested-by: Konstantin Khlebnikov <koct9i@gmail.com> Reviewed-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: Michal Marek <mmarek@suse.cz>
* Merge branch 'kbuild' of ↵Linus Torvalds2014-04-081-0/+1
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild Pull kbuild changes from Michal Marek: - cleanups in the main Makefiles and Documentation/DocBook/Makefile - make O=... directory is automatically created if needed - mrproper/distclean removes the old include/linux/version.h to make life easier when bisecting across the commit that moved the version.h file * 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild: kbuild: docbook: fix the include error when executing "make help" kbuild: create a build directory automatically for out-of-tree build kbuild: remove redundant '.*.cmd' pattern from make distclean kbuild: move "quote" to Kbuild.include to be consistent kbuild: docbook: use $(obj) and $(src) rather than specific path kbuild: unconditionally clobber include/linux/version.h on distclean kbuild: docbook: specify KERNELDOC dependency correctly kbuild: docbook: include cmd files more simply kbuild: specify build_docproc as a phony target
| * kbuild: move "quote" to Kbuild.include to be consistentMasahiro Yamada2014-03-291-0/+1
| | | | | | | | | | Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com> Signed-off-by: Michal Marek <mmarek@suse.cz>
* | Kbuild, lto: add ld-version and ld-ifversion macrosAndi Kleen2014-02-141-0/+9
|/ | | | | | | | To check the linker version. Used by the LTO makefile. Signed-off-by: Andi Kleen <ak@linux.intel.com> Link: http://lkml.kernel.org/r/1391846481-31491-9-git-send-email-ak@linux.intel.com Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
* kbuild: fix ld-option functionAntony Pavlov2013-04-081-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The kbuild's ld-option function is broken because the command $(CC) /dev/null -c -o "$$TMPO" does not create object file! I have used a relatively old mips gcc 3.4.6 cross-compiler and a relatively new gcc 4.7.2 to check this fact but the results are the same. EXAMPLE: $ rm /tmp/1.o $ mips-linux-gcc /dev/null -c -o /tmp/1.o mips-linux-gcc: /dev/null: linker input file unused because linking not done $ ls -la /tmp/1.o ls: cannot access /tmp/1.o: No such file or directory We can easily fix the problem by adding the '-x c' compiler option. EXAMPLE: $ rm /tmp/1.o $ mips-linux-gcc -x c /dev/null -c -o /tmp/1.o $ ls -la /tmp/1.o -rw-r--r-- 1 antony antony 778 Apr 2 20:40 /tmp/1.o Also fix wrong ld-option example. Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com> Signed-off-by: Michal Marek <mmarek@suse.cz>
* Merge branch 'rc-fixes' of ↵Linus Torvalds2012-10-081-6/+6
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild Pull kbuild fixes from Michal Marek: "Here are two fixes I intended to send after v3.6-rc7, but failed to do so. So please pull them for v3.7-rc1 and they will be picked up by stable. The first one fixes gcc -x <language> syntax in various build-time tests, which icecream and possible other gcc wrappers did not understand (and yes, icecream is going to be fixed as well). The second one fixes make tar-pkg so that unpacking the tarball does not replace the /lib -> /usr/lib symlink on recent Fedora releases." * 'rc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild: kbuild: Fix gcc -x syntax kbuild: Do not package /boot and /lib in make tar-pkg
| * kbuild: Fix gcc -x syntaxJean Delvare2012-10-031-6/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The correct syntax for gcc -x is "gcc -x assembler", not "gcc -xassembler". Even though the latter happens to work, the former is what is documented in the manual page and thus what gcc wrappers such as icecream do expect. This isn't a cosmetic change. The missing space prevents icecream from recognizing compilation tasks it can't handle, leading to silent kernel miscompilations. Besides me, credits go to Michael Matz and Dirk Mueller for investigating the miscompilation issue and tracking it down to this incorrect -x parameter syntax. Signed-off-by: Jean Delvare <jdelvare@suse.de> Acked-by: Ingo Molnar <mingo@kernel.org> Cc: stable@vger.kernel.org Cc: Bernhard Walle <bernhard@bwalle.de> Cc: Michal Marek <mmarek@suse.cz> Cc: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: Michal Marek <mmarek@suse.cz>
* | kbuild: make: fix if_changed when command contains backslashesSascha Hauer2012-10-051-1/+1
|/ | | | | | | | | | | | | | | | | | | | | The call if_changed mechanism does not work when the command contains backslashes. This basically is an issue with lzo and bzip2 compressed kernels. The compressed binaries do not contain the uncompressed image size, so these use size_append to append the size. This results in backslashes in the executed command. With this if_changed always detects a change in the command and rebuilds the compressed image even if nothing has changed. Fix this by escaping backslashes in make-cmd Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Signed-off-by: Jan Luebbe <jlu@pengutronix.de> Cc: Sam Ravnborg <sam@ravnborg.org> Cc: Bernhard Walle <bernhard@bwalle.de> Cc: Michal Marek <mmarek@suse.cz> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* scripts/Kbuild.include: Fix portability problem of "echo -e"Bernhard Walle2012-03-241-1/+1
| | | | | | | | | | | | | | | | | "echo -e" is a GNU extension. When cross-compiling the kernel on a BSD-like operating system (Mac OS X in my case), this doesn't work. One could install a GNU version of echo, put that in the $PATH before the system echo and use "/usr/bin/env echo", but the solution with printf is simpler. Since it is no disadvantage on Linux, I hope that gets accepted even if cross-compiling the Linux kernel on another Unix operating system is quite a rare use case. Signed-off-by: Bernhard Walle <bernhard@bwalle.de> Andreas Bießmann <andreas@biessmann.de> Signed-off-by: Michal Marek <mmarek@suse.cz>
* kbuild: add `baseprereq'Arnaud Lacombe2011-06-091-0/+4
| | | | | | | On the same model as `basetarget', it represents the filename of first prerequisite with directory and extension stripped. Signed-off-by: Arnaud Lacombe <lacombar@gmail.com>
* kbuild: make KBUILD_NOCMDDEP=1 handle empty built-in.oMichal Marek2011-05-161-0/+2
| | | | | | | | | | | | | | | Based on a patch by Rabin Vincent. Fix building with KBUILD_NOCMDDEP=1, which currently does not work because it does not build built-in.o with no dependencies: LD fs/notify/built-in.o ld: cannot find fs/notify/dnotify/built-in.o: No such file or directory ld: cannot find fs/notify/inotify/built-in.o: No such file or directory ld: cannot find fs/notify/fanotify/built-in.o: No such file or directory Reported-and-tested-by: Rabin Vincent <rabin@rab.in> Signed-off-by: Michal Marek <mmarek@suse.cz>
* kbuild: Fix passing -Wno-* options to gcc 4.4+Michal Marek2011-05-031-0/+5
| | | | | | | | | | | | | Starting with 4.4, gcc will happily accept -Wno-<anything> in the cc-option test and complain later when compiling a file that has some other warning. This rather unexpected behavior is intentional as per http://gcc.gnu.org/PR28322, so work around it by testing for support of the opposite option (without the no-). Introduce a new Makefile function cc-disable-warning that does this and update two uses of cc-option in the toplevel Makefile. Reported-and-tested-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Michal Marek <mmarek@suse.cz>
* kbuild: Fix build with binutils <= 2.19Michal Marek2011-04-201-0/+5
| | | | | | The D option of ar is only available in newer versions. Signed-off-by: Michal Marek <mmarek@suse.cz>
* kbuild: generate modules.builtinMichal Marek2009-12-121-0/+6
| | | | | | | | | | | To make it easier for module-init-tools and scripts like mkinitrd to distinguish builtin and missing modules, install a modules.builtin file listing all builtin modules. This is done by generating an additional config file (tristate.conf) with tristate options set to uppercase 'Y' or 'M'. If we source that config file, the builtin modules appear in obj-Y. Signed-off-by: Michal Marek <mmarek@suse.cz>
* kbuild,scripts: use non-builtin echo for '-e'Amerigo Wang2009-10-111-1/+1
| | | | | | | | | Alek reported that on Ubuntu, where dash is used, 'echo -e' can't work, so let's use non-builtin echo in this case. Reported-by: Alek Du <alek.du@intel.com> Signed-off-by: WANG Cong <xiyou.wangcong@gmail.com> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
* kbuild: fix cc1 options check to ensure we do not use -fPIC when compilingJory A. Pratt2009-09-201-2/+2
| | | | | | | | | | | | | | | | | | | The arch/*/boot/Makefile use cc-options to check for GCC command options and cc-options use the hardened specs when checking for GCC command options. When -fPIE is pass to cc1 it can't use -ffreestanding or -fno-toplevel-reorder. Then it fail to build stuff with -ffreestanding and -fno-toplevel-reorder. Thanks to Fredric Johansson for finding the main problem behind a failed build using a hardened toolchain. Signed-off-by: Magnus Granberg <zorry@ume.nu> Signed-off-by: Jory A. Pratt <anarchy@gentoo.org> Cc: Fredric Johansson <johansson_fredric@hotmail.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: <stable@kernel.org> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
* kbuild: introduce ld-optionSam Ravnborg2009-09-201-1/+7
| | | | | | | | | | | ld-option is used to check if $(LD) supports a specific option. Based on patch from Andi Kleen. Cc: Andi Kleen <ak@linux.intel.com> Signed-off-by: Sam Ravnborg <sam@ravnborg.org> First use is to check if option -X is supported (upcoming patch). Theis is ne
* kbuild: rename ld-option to cc-ldoptionSam Ravnborg2009-09-201-3/+3
| | | | | | | | | ld-option is misnamed as it test options to gcc, not to ld. Renamed it to reflect this. Cc: Andi Kleen <andi@firstfloor.org> Cc: Roland McGrath <roland@redhat.com> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
* kbuild: use KECHO convenience echoMike Frysinger2008-12-031-9/+2
| | | | | | | | | Convert a few echos in the build system to new $(kecho) so we get correct output according to build verbosity. Signed-off-by: Mike Frysinger <vapier@gentoo.org> [sam: added kecho in a few more places for O=... builds] Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
* kbuild: introduce $(kecho) convenience echoMike Frysinger2008-12-031-0/+7
| | | | | | | | | | | There is a bunch of places in the build system where we do 'echo' to show some nice status lines. This means we still get output when running in silent mode. So declare a new KECHO variable that only does 'echo' when we are in a suitable verbose build mode. Signed-off-by: Mike Frysinger <vapier@gentoo.org> [sam: added Documentation] Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
* kbuild: fix -I option expansion with O=... buildsSam Ravnborg2008-12-031-1/+3
| | | | | | | | | | | | | | | | | | | When adding extra -I options with O=... we could end up in a situation where there were no parameters to -I. So we had a commandline that looked like this: ... -I -Wall ... This had the undesired side effect that gcc assumed "-Wall" was a path to look for include files so this options was effectively ignored. This happens only when we build the generated module.mod.c files as part of the final modules builds and is as such harmless with current kbuild. This bug was exposed when we rearranged the options to gcc. Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
* kbuild: fix cc-option and cc-option-ynH. Peter Anvin2008-09-091-2/+2
| | | | | | | | | | | | | | | | David Sanders wrote: > I'm getting this error: > as: unrecognized option `-mtune=generic32' > I have binutils 2.17. Use -c instead of -S in cc-option and cc-option-yn, so we can probe options related to the assembler. Signed-off-by: H. Peter Anvin <hpa@zytor.com> Cc: Sam Ravnborg <sam@ravnborg.org> Cc: kbuild devel <kbuild-devel@lists.sourceforge.net> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* kbuild: fix make V=1Sam Ravnborg2008-02-111-0/+3
| | | | | | | | | | When make -s support were added to filechk to combination created with make V=1 were not covered. Fix it by explicitly cover this case too. Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Cc: Mike Frysinger <vapier@gentoo.org>
* kbuild: silence CHK/UPD messages according to $(quiet)Mike Frysinger2008-02-091-2/+6
| | | | | Signed-off-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
* kbuild: introduce cc-cross-prefixSam Ravnborg2007-10-191-0/+11
| | | | | | | | | | | | | | | | | | cc-cross-prefix is useful for the architecture that like to provide a default CROSS_COMPILE value, but may have several to select between. Sample usage: ifneq ($(SUBARCH),$(ARCH)) ifeq ($(CROSS_COMPILE),) CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-) endif endif Actual usage by the different archs will taken care of later. Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
* kbuild: enable 'make AFLAGS=...' to add additional options to ASSam Ravnborg2007-10-151-1/+1
| | | | | | | | | | | | | | | The variable AFLAGS is a wellknown variable and the usage by kbuild may result in unexpected behaviour. On top of that several people over time has asked for a way to pass in additional flags to gcc. This patch replace use of AFLAGS with KBUILD_AFLAGS all over the tree. Patch was tested on following architectures: alpha, arm, i386, x86_64, mips, sparc, sparc64, ia64, m68k, s390 Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
* kbuild: enable 'make CFLAGS=...' to add additional options to CCSam Ravnborg2007-10-141-3/+3
| | | | | | | | | | | | | | | | | | | | | | | The variable CFLAGS is a wellknown variable and the usage by kbuild may result in unexpected behaviour. On top of that several people over time has asked for a way to pass in additional flags to gcc. This patch replace use of CFLAGS with KBUILD_CFLAGS all over the tree and enabling one to use: make CFLAGS=... to specify additional gcc commandline options. One usecase is when trying to find gcc bugs but other use cases has been requested too. Patch was tested on following architectures: alpha, arm, i386, x86_64, mips, sparc, sparc64, ia64, m68k Test was simple to do a defconfig build, apply the patch and check that nothing got rebuild. Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
* kbuild: New 'cc-fullversion' macroSegher Boessenkool2007-07-161-1/+6
| | | | | | | | Prints a six-digit string including the GCC patchlevel. Also fix the 'usage' comment for cc-version. Signed-off-by: Segher Boessenkool <segher@kernel.crashing.org> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
* [PATCH] kbuild: more Makefile cleanupsRoman Zippel2007-02-091-36/+36
| | | | | | | | | | | | | | | | This adds the remaining changes which should have been part of the review process. - the define command is inappropriate (it's primarily for rule definitions) - execute commands in the current dir as all other commands - .*.tmp (but not .*.null) files are also removed up by "make clean" - printf has other side effects, just use "echo -e" - proper quoting - proper indentation Signed-off-by: Roman Zippel <zippel@linux-m68k.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* kbuild: fix space for good (take 103)Linus Torvalds2007-02-081-10/+9
| | | | | | | | | | | Michal Ostrowski points out what the real problem was: the spaces at the start of the definition of the 'checker-shell' make function. Cc: Michal Ostrowski <mostrows@watson.ibm.com> Acked-by: David Miller <davem@davemloft.net> Acked-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com> Acked-by: Oleg Verych <olecom@flower.upol.cz> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* kbuild: make $(checker-shell ) strip spaces around the resultLinus Torvalds2007-02-081-3/+2
| | | | | | | | | | | | It looks like GNU make version 3.80 (but apparently not 3.81) adds leading whitespace to the result of the checker-shell execution. This strips them off explicitly. Also, don't bother symlinking the output file to /dev/null. It's likely as expensive as just writing the temp-file, and we need to remove it anyway afterwards. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [PATCH] kbuild, Kbuild.include: avoid using spaces in call argumentsOleg Verych2007-02-081-20/+20
| | | | | | | | | | | | | | | | Do not use whitespace in arguments of functions in makefiles, as they propagate further without notice. Thus we get + echo ' y' instead of + echo y Fix misleading comments. Signed-off-by: Oleg Verych <olecom@flower.upol.cz> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [PATCH] kbuild: improve option checking, Kbuild.include cleanupOleg Verych2007-02-061-43/+53
| | | | | | | | | | | | | | | GNU binutils, root users, tmpfiles, external modules ro builds must be fixed to do the right thing now. Cc: Roman Zippel <zippel@linux-m68k.org> Cc: Sam Ravnborg <sam@ravnborg.org> Cc: Horst Schirmeier <horst@schirmeier.com> Cc: Jan Beulich <jbeulich@novell.com> Cc: Daniel Drake <dsd@gentoo.org> Cc: Andi Kleen <ak@suse.de> Cc: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Oleg Verych <olecom@flower.upol.cz> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [PATCH] kbuild: don't put temp files in sourceRoman Zippel2006-12-101-7/+12
| | | | | | | | | | | | | | | | The as-instr/ld-option need to create temporary files, but create them in the output directory, when compiling external modules. Reformat them a bit and use $(CC) instead of $(AS) as the former is used by kbuild to assemble files. Signed-off-by: Roman Zippel <zippel@linux-m68k.org> Cc: Andi Kleen <ak@suse.de> Cc: Jan Beulich <jbeulich@novell.com> Cc: Sam Ravnborg <sam@ravnborg.org> Cc: <jpdenheijer@gmail.com> Cc: Horst Schirmeier <horst@schirmeier.com> Cc: Daniel Drake <dsd@gentoo.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] i386/x86-64: Work around gcc bug with noreturn functions in unwinderJan Beulich2006-09-261-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | Current gcc generates calls not jumps to noreturn functions. When that happens the return address can point to the next function, which confuses the unwinder. This patch works around it by marking asynchronous exception frames in contrast normal call frames in the unwind information. Then teach the unwinder to decode this. For normal call frames the unwinder now subtracts one from the address which avoids this problem. The standard libgcc unwinder uses the same trick. It doesn't include adjustment of the printed address (i.e. for the original example, it'd still be kernel_math_error+0 that gets displayed, but the unwinder wouldn't get confused anymore. This only works with binutils 2.6.17+ and some versions of H.J.Lu's 2.6.16 unfortunately because earlier binutils don't support .cfi_signal_frame [AK: added automatic detection of the new binutils and wrote description] Signed-off-by: Jan Beulich <jbeulich@novell.com> Signed-off-by: Andi Kleen <ak@suse.de>
* [PATCH] x86: Detect CFI support in the assembler at runtimeAndi Kleen2006-09-261-0/+7
| | | | | | | | | | | | | | ... instead of using a CONFIG option. The config option still controls if the resulting executable actually has unwind information. This is useful to prevent compilation errors when users select CONFIG_STACK_UNWIND on old binutils and also allows to use CFI in the future for non kernel debugging applications. Cc: jbeulich@novell.com Cc: sam@ravnborg.org Signed-off-by: Andi Kleen <ak@suse.de>
* kbuild: make V=2 tell why a target is rebuildSam Ravnborg2006-09-251-1/+40
| | | | | | | | | | | | | | | | | | | | | | | | | | tell why a a target got build enabled by make V=2 Output (listed in the order they are checked): (1) - due to target is PHONY (2) - due to target missing (3) - due to: file1.h file2.h (4) - due to command line change (5) - due to missing .cmd file (6) - due to target not in $(targets) (1) We always build PHONY targets (2) No target, so we better build it (3) Prerequisite is newer than target (4) The command line stored in the file named dir/.target.cmd differed from actual command line. This happens when compiler options changes (5) No dir/.target.cmd file (used to store command line) (6) No dir/.target.cmd file and target not listed in $(targets) This is a good hint that there is a bug in the kbuild file This patch is inspired by a patch from: Milton Miller <miltonm@bga.com> Cc: Milton Miller <miltonm@bga.com> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
* kbuild: consistently decide when to rebuild a targetSam Ravnborg2006-09-251-22/+30
| | | | | | | | | | | Consistently decide when to rebuild a target across all of if_changed, if_changed_dep, if_changed_rule. PHONY targets are now treated alike (ignored) for all targets While add it make Kbuild.include almost readable by factoring out a few bits to some common variables and reuse this in Makefile.build. Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
* kbuild: always use $(CC) for $(call cc-version)Sam Ravnborg2006-08-011-2/+1
| | | | | | | The possibility to specify an optional parameter did not work out as expected and it was not used - so remove the possibility. Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
* [PATCH] vDSO hash-style fixRoland McGrath2006-07-311-0/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The latest toolchains can produce a new ELF section in DSOs and dynamically-linked executables. The new section ".gnu.hash" replaces ".hash", and allows for more efficient runtime symbol lookups by the dynamic linker. The new ld option --hash-style={sysv|gnu|both} controls whether to produce the old ".hash", the new ".gnu.hash", or both. In some new systems such as Fedora Core 6, gcc by default passes --hash-style=gnu to the linker, so that a standard invocation of "gcc -shared" results in producing a DSO with only ".gnu.hash". The new ".gnu.hash" sections need to be dealt with the same way as ".hash" sections in all respects; only the dynamic linker cares about their contents. To work with older dynamic linkers (i.e. preexisting releases of glibc), a binary must have the old ".hash" section. The --hash-style=both option produces binaries that a new dynamic linker can use more efficiently, but an old dynamic linker can still handle. The new section runs afoul of the custom linker scripts used to build vDSO images for the kernel. On ia64, the failure mode for this is a boot-time panic because the vDSO's PT_IA_64_UNWIND segment winds up ill-formed. This patch addresses the problem in two ways. First, it mentions ".gnu.hash" in all the linker scripts alongside ".hash". This produces correct vDSO images with --hash-style=sysv (or old tools), with --hash-style=gnu, or with --hash-style=both. Second, it passes the --hash-style=sysv option when building the vDSO images, so that ".gnu.hash" is not actually produced. This is the most conservative choice for compatibility with any old userland. There is some concern that some ancient glibc builds (though not any known old production system) might choke on --hash-style=both binaries. The optimizations provided by the new style of hash section do not really matter for a DSO with a tiny number of symbols, as the vDSO has. If someone wants to use =gnu or =both for their vDSO builds and worry less about that compatibility, just change the option and the linker script changes will make any choice work fine. Signed-off-by: Roland McGrath <roland@redhat.com> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: Kyle McMartin <kyle@mcmartin.ca> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Jeff Dike <jdike@addtoit.com> Cc: Andi Kleen <ak@muc.de> Cc: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* kbuild: fix ia64 breakage after introducing make -rRSam Ravnborg2006-07-011-0/+4
| | | | | | | | | | | | | | | | | | kbuild used $¤(*F to get filename of target without extension. This was used in several places all over kbuild, but introducing make -rR broke his for all cases where we specified full path to target/prerequsite. It is assumed that make -rR disables old style suffix-rules which is why is suddenly failed. ia64 was impacted by this change because several div* routines in arch/ia64/lib are build using explicit paths and then kbuild failed. Thanks to David Mosberger-Tang <David.Mosberger@acm.org> for an explanation what was the root-cause and for testing on ia64. This patch also fixes two uses of $(*F) in arch/um Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
* Revert "kbuild: fix make -rR breakage"Linus Torvalds2006-06-271-5/+0
| | | | | | | | | | | | | | | | | | | This reverts commit e5c44fd88c146755da6941d047de4d97651404a9. Thanks to Daniel Ritz and Michal Piotrowski for noticing the problem. Daniel says: "[The] reason is a recent change that made modules always shows as module.mod. it breaks modprobe and probably many scripts..besides lsmod looking horrible stuff like this in modprobe.conf: install pcmcia_core /sbin/modprobe --ignore-install pcmcia_core; /sbin/modprobe pcmcia makes modprobe fork/exec endlessly calling itself...until oom interrupts it" Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* kbuild: fix make -rR breakageSam Ravnborg2006-06-241-0/+5
| | | | | | | | | make failed to supply the filename when using make -rR and using $(*F) to get target filename without extension. This bug was not reproduceable in small scale but using: $(basename $(notdir $@)) fixes it with same functionality. Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
* kbuild: properly pass options to hostcc when doing make O=..Sam Ravnborg2006-04-071-0/+5
| | | | | | | | | | | This fix a longstanding bug where proper options was not passed to hostcc in case of a make O=.. build. This bug showed up in (not yet merged) klibc, and is not known to have any counterpart in-kernel. Fixed by moving the flags macro to Kbuild.include so it can be used by both Makefile.lib and Makefile.host. Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
* kbuild: change kbuild to not rely on incorrect GNU make behaviorPaul Smith2006-03-061-5/+8
| | | | | | | | | | | | | | | | | | | | The kbuild system takes advantage of an incorrect behavior in GNU make. Once this behavior is fixed, all files in the kernel rebuild every time, even if nothing has changed. This patch ensures kbuild works with both the incorrect and correct behaviors of GNU make. For more details on the incorrect behavior, see: http://lists.gnu.org/archive/html/bug-make/2006-03/msg00003.html Changes in this patch: - Keep all targets that are to be marked .PHONY in a variable, PHONY. - Add .PHONY: $(PHONY) to mark them properly. - Remove any $(PHONY) files from the $? list when determining whether targets are up-to-date or not. Signed-off-by: Paul Smith <psmith@gnu.org> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
* kbuild: fix comment in Kbuild.includeSam Ravnborg2006-02-191-1/+1
| | | | | | Noted by Olaf Hering <olh@suse.de> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
* kbuild: consolidate command line escapingJan Beulich2006-02-191-8/+7
| | | | | | | | | | | | While the recent change to also escape # symbols when storing C-file compilation command lines was helpful, it should be in effect for all command lines, as much as the dollar escaping should be in effect for C-source compilation commands. Additionally, for better readability and maintenance, consolidating all the escaping (single quotes, dollars, and now sharps) was also desirable. Signed-Off-By: Jan Beulich <jbeulich@novell.com> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
* kbuild: make cc-version available in kbuild filesSam Ravnborg2006-02-191-0/+37
| | | | | | | | | | | | | | | Move $(CC) support functions to Kbuild.include so they are available in the kbuild files. In addition the following was done: o as-option documented in Documentation/kbuild/makefiles.txt o Moved documentation to new section to match new scope of functions o added cc-ifversion used to conditionally select a text string dependent on actual $(CC) version o documented cc-ifversion o change so Kbuild.include is read before the kbuild file Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
* kbuild: introduce escsq to escapre single quotesSam Ravnborg2006-01-061-4/+9
| | | | | | | This makes things a little bit more reader friendly and gvim is less confused. Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
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