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The '-e' option to echo and brace expansion are not guaranteed to be supported
by a POSIX-compliant /bin/sh (e.g. dash)
Signed-off-by: dann frazier <dannf@debian.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
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Greg Schafer <gschafer@zip.com.au> reported:
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$make mrproper
scripts/gcc-version.sh: [[: command not found
This is on a very old host with an ancient bash as /bin/sh. But I have
CONFIG_SHELL set and pointing to a modern bash. Something is wrong.
This doesn't happen with 2.6.23
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Fixed using a more common string equality test.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Greg Schafer <gschafer@zip.com.au>
Cc: Jesper Juhl <jesper.juhl@gmail.com>
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Currently, if you call scripts/gcc-version.sh without arguments it will
generate this output :
$ sh scripts/gcc-version.sh
scripts/gcc-version.sh: line 12: [: =: unary operator expected
scripts/gcc-version.sh: line 16: -E: command not found
scripts/gcc-version.sh: line 17: -E: command not found
0000
Not too pretty. I believe this is an improvement :
$ sh scripts/gcc-version.sh
Error: No compiler specified.
Usage:
scripts/gcc-version.sh <gcc-command>
Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
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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>
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From: Andi Kleen <ak@muc.de>, me.
Using -mregparm=3 shrinks the kernel further:
(compiled with gcc 3.4, without -funit-at-a-time, using the later and
together with -Os shrinks .text even more, making over 700KB difference)
4129346 708629 207240 5045215 4cfbdf vmlinux
3892905 708629 207240 4808774 496046 vmlinux-regparm
This one helps even more, >236KB .text difference. Clearly worth
the effort.
This patch adds an option to use -mregparm=3 while compiling the kernel. I
did an LTP run and it showed no additional failures over an non regparm
kernel.
According to some gcc developers it should be safe to use in all gccs that
are still supports (2.95 and up)
I didn't make it the default because it will break all binary only modules
(although they can be fixed by adding a wrapper that calls them with
"asmlinkage"). Actually it may be a good idea to make this default with
2.7.1 or somesuch.
We add new kbuild infrastructure: the command
scripts/gcc-version.sh $(CC)
will print out the version of gcc in a canonical 4-digit form suitable for
performing numerical tests against.
DESC
arch/i386/Makefile,scripts/gcc-version.sh,Makefile small fixes
EDESC
From: Serge Belyshev <33554432@mtu-net.ru>
arch/i386/Makefile:
* omitted $(KBUILD_SRC)/ in script call.
scripts/gcc-version.sh:
* GNU tail no longer supports 'tail -1' syntax.
We should consider adding -fweb option:
vanilla:
$ size vmlinux
text data bss dec hex filename
3056270 526780 386056 3969106 3c9052 vmlinux
with -fweb:
$ size vmlinux
text data bss dec hex filename
3049523 526780 386056 3962359 3c75f7 vmlinux
Also note 0.1 ... 1.0% speedup in various benchmarks.
This option is not enabled by default at -O2 because it
(like -fomit-frame-pointer) makes debugging impossible.
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