From: Alexandre Belloni <[email protected]>
When using dash as /bin/sh, the CC_HAS_ASM_GOTO_TIED_OUTPUT test fails
with a syntax error which is not the one we are looking for:
<stdin>: In function ‘foo’:
<stdin>:1:29: warning: missing terminating " character
<stdin>:1:29: error: missing terminating " character
<stdin>:2:5: error: expected ‘:’ before ‘+’ token
<stdin>:2:7: warning: missing terminating " character
<stdin>:2:7: error: missing terminating " character
<stdin>:2:5: error: expected declaration or statement at end of input
Removing '\n' solves this.
Fixes: 1aa0e8b144b6 ("Kconfig: Add option for asm goto w/ tied outputs to workaround clang-13 bug")
Signed-off-by: Alexandre Belloni <[email protected]>
---
init/Kconfig | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/init/Kconfig b/init/Kconfig
index 694f7c160c9c..13e93bcbc807 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -87,7 +87,7 @@ config CC_HAS_ASM_GOTO_OUTPUT
config CC_HAS_ASM_GOTO_TIED_OUTPUT
depends on CC_HAS_ASM_GOTO_OUTPUT
# Detect buggy gcc and clang, fixed in gcc-11 clang-14.
- def_bool $(success,echo 'int foo(int *x) { asm goto (".long (%l[bar]) - .\n": "+m"(*x) ::: bar); return *x; bar: return 0; }' | $CC -x c - -c -o /dev/null)
+ def_bool $(success,echo 'int foo(int *x) { asm goto (".long (%l[bar]) - .": "+m"(*x) ::: bar); return *x; bar: return 0; }' | $CC -x c - -c -o /dev/null)
config TOOLS_SUPPORT_RELR
def_bool $(success,env "CC=$(CC)" "LD=$(LD)" "NM=$(NM)" "OBJCOPY=$(OBJCOPY)" $(srctree)/scripts/tools-support-relr.sh)
--
2.38.1
+Masahiro and build, as I don't think this should go through the KVM tree (which
is also partly why no one has responded).
On a related topic, should init/Kconfig be added to the KCONFIG MAINTAINERS entry?
Or is there a better owner for this?
diff --git a/MAINTAINERS b/MAINTAINERS
index 046ff06ff97f..ffff36e16b88 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -11040,6 +11040,7 @@ T: git git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git
F: Documentation/kbuild/kconfig*
F: scripts/Kconfig.include
F: scripts/kconfig/
+F: init/Kconfig
KCOV
R: Dmitry Vyukov <[email protected]>
On Tue, Nov 15, 2022, [email protected] wrote:
> From: Alexandre Belloni <[email protected]>
>
> When using dash as /bin/sh, the CC_HAS_ASM_GOTO_TIED_OUTPUT test fails
> with a syntax error which is not the one we are looking for:
>
> <stdin>: In function ‘foo’:
> <stdin>:1:29: warning: missing terminating " character
> <stdin>:1:29: error: missing terminating " character
> <stdin>:2:5: error: expected ‘:’ before ‘+’ token
> <stdin>:2:7: warning: missing terminating " character
> <stdin>:2:7: error: missing terminating " character
> <stdin>:2:5: error: expected declaration or statement at end of input
>
> Removing '\n' solves this.
>
> Fixes: 1aa0e8b144b6 ("Kconfig: Add option for asm goto w/ tied outputs to workaround clang-13 bug")
> Signed-off-by: Alexandre Belloni <[email protected]>
> ---
> init/Kconfig | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/init/Kconfig b/init/Kconfig
> index 694f7c160c9c..13e93bcbc807 100644
> --- a/init/Kconfig
> +++ b/init/Kconfig
> @@ -87,7 +87,7 @@ config CC_HAS_ASM_GOTO_OUTPUT
> config CC_HAS_ASM_GOTO_TIED_OUTPUT
> depends on CC_HAS_ASM_GOTO_OUTPUT
> # Detect buggy gcc and clang, fixed in gcc-11 clang-14.
> - def_bool $(success,echo 'int foo(int *x) { asm goto (".long (%l[bar]) - .\n": "+m"(*x) ::: bar); return *x; bar: return 0; }' | $CC -x c - -c -o /dev/null)
> + def_bool $(success,echo 'int foo(int *x) { asm goto (".long (%l[bar]) - .": "+m"(*x) ::: bar); return *x; bar: return 0; }' | $CC -x c - -c -o /dev/null)
Tested a variety of compiler versions via godbolt, and the results are the same
for all cases, so with the caveat that I am far from a shell expert:
Reviewed-by: Sean Christopherson <[email protected]>
On Tue, Nov 22, 2022 at 4:31 AM Sean Christopherson <[email protected]> wrote:
>
> +Masahiro and build, as I don't think this should go through the KVM tree (which
> is also partly why no one has responded).
Presumably this was sent to the author and the commiter of
1aa0e8b144b6474c4914439d232d15bfe883636b
If Paolo does not pick this up, I can.
Now applied to linux-kbuild/fixes. Thanks.
> On a related topic, should init/Kconfig be added to the KCONFIG MAINTAINERS entry?
No, I do not think so.
init/Kconfig contains a lot, which I am not responsible for.
> Or is there a better owner for this?
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 046ff06ff97f..ffff36e16b88 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -11040,6 +11040,7 @@ T: git git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git
> F: Documentation/kbuild/kconfig*
> F: scripts/Kconfig.include
> F: scripts/kconfig/
> +F: init/Kconfig
>
> KCOV
> R: Dmitry Vyukov <[email protected]>
>
> On Tue, Nov 15, 2022, [email protected] wrote:
> > From: Alexandre Belloni <[email protected]>
> >
> > When using dash as /bin/sh, the CC_HAS_ASM_GOTO_TIED_OUTPUT test fails
> > with a syntax error which is not the one we are looking for:
> >
> > <stdin>: In function ‘foo’:
> > <stdin>:1:29: warning: missing terminating " character
> > <stdin>:1:29: error: missing terminating " character
> > <stdin>:2:5: error: expected ‘:’ before ‘+’ token
> > <stdin>:2:7: warning: missing terminating " character
> > <stdin>:2:7: error: missing terminating " character
> > <stdin>:2:5: error: expected declaration or statement at end of input
> >
> > Removing '\n' solves this.
> >
> > Fixes: 1aa0e8b144b6 ("Kconfig: Add option for asm goto w/ tied outputs to workaround clang-13 bug")
> > Signed-off-by: Alexandre Belloni <[email protected]>
> > ---
> > init/Kconfig | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/init/Kconfig b/init/Kconfig
> > index 694f7c160c9c..13e93bcbc807 100644
> > --- a/init/Kconfig
> > +++ b/init/Kconfig
> > @@ -87,7 +87,7 @@ config CC_HAS_ASM_GOTO_OUTPUT
> > config CC_HAS_ASM_GOTO_TIED_OUTPUT
> > depends on CC_HAS_ASM_GOTO_OUTPUT
> > # Detect buggy gcc and clang, fixed in gcc-11 clang-14.
> > - def_bool $(success,echo 'int foo(int *x) { asm goto (".long (%l[bar]) - .\n": "+m"(*x) ::: bar); return *x; bar: return 0; }' | $CC -x c - -c -o /dev/null)
> > + def_bool $(success,echo 'int foo(int *x) { asm goto (".long (%l[bar]) - .": "+m"(*x) ::: bar); return *x; bar: return 0; }' | $CC -x c - -c -o /dev/null)
>
> Tested a variety of compiler versions via godbolt, and the results are the same
> for all cases, so with the caveat that I am far from a shell expert:
>
> Reviewed-by: Sean Christopherson <[email protected]>
--
Best Regards
Masahiro Yamada