[3/3] powerpc: Fix powerpc64 strchrnul build with old gcc
Checks
Context |
Check |
Description |
linaro-tcwg-bot/tcwg_glibc_check--master-arm |
success
|
Testing passed
|
linaro-tcwg-bot/tcwg_glibc_build--master-arm |
success
|
Testing passed
|
linaro-tcwg-bot/tcwg_glibc_build--master-aarch64 |
success
|
Testing passed
|
linaro-tcwg-bot/tcwg_glibc_check--master-aarch64 |
fail
|
Testing failed
|
Commit Message
The compiler might not see that internal definition is an alias
due the libc_ifunc macro, which redefines __strchrnul. With
gcc 6 it fails with:
In file included from <command-line>:0:0:
./../include/libc-symbols.h:472:33: error: ‘__EI___strchrnul’ aliased to
undefined symbol ‘__GI___strchrnul’
extern thread __typeof (name) __EI_##name \
^
./../include/libc-symbols.h:468:3: note: in expansion of macro
‘__hidden_ver2’
__hidden_ver2 (, local, internal, name)
^~~~~~~~~~~~~
./../include/libc-symbols.h:476:29: note: in expansion of macro
‘__hidden_ver1’
# define hidden_def(name) __hidden_ver1(__GI_##name, name, name);
^~~~~~~~~~~~~
./../include/libc-symbols.h:557:32: note: in expansion of macro
‘hidden_def’
# define libc_hidden_def(name) hidden_def (name)
^~~~~~~~~~
../sysdeps/powerpc/powerpc64/multiarch/strchrnul.c:38:1: note: in
expansion of macro ‘libc_hidden_def’
libc_hidden_def (__strchrnul)
^~~~~~~~~~~~~~~
Use libc_ifunc_hidden as stpcpy. Checked on powerpc64 with
gcc 6 and gcc 13.
---
sysdeps/powerpc/powerpc64/multiarch/strchrnul.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
Comments
On 7/24/23 13:15, Adhemerval Zanella via Libc-alpha wrote:
> The compiler might not see that internal definition is an alias
> due the libc_ifunc macro, which redefines __strchrnul. With
> gcc 6 it fails with:
>
> In file included from <command-line>:0:0:
> ./../include/libc-symbols.h:472:33: error: ‘__EI___strchrnul’ aliased to
> undefined symbol ‘__GI___strchrnul’
> extern thread __typeof (name) __EI_##name \
> ^
> ./../include/libc-symbols.h:468:3: note: in expansion of macro
> ‘__hidden_ver2’
> __hidden_ver2 (, local, internal, name)
> ^~~~~~~~~~~~~
> ./../include/libc-symbols.h:476:29: note: in expansion of macro
> ‘__hidden_ver1’
> # define hidden_def(name) __hidden_ver1(__GI_##name, name, name);
> ^~~~~~~~~~~~~
> ./../include/libc-symbols.h:557:32: note: in expansion of macro
> ‘hidden_def’
> # define libc_hidden_def(name) hidden_def (name)
> ^~~~~~~~~~
> ../sysdeps/powerpc/powerpc64/multiarch/strchrnul.c:38:1: note: in
> expansion of macro ‘libc_hidden_def’
> libc_hidden_def (__strchrnul)
> ^~~~~~~~~~~~~~~
>
> Use libc_ifunc_hidden as stpcpy. Checked on powerpc64 with
> gcc 6 and gcc 13.
Using the _hidden variant here is OK.
LGTM.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
> ---
> sysdeps/powerpc/powerpc64/multiarch/strchrnul.c | 14 +++++++-------
> 1 file changed, 7 insertions(+), 7 deletions(-)
>
> diff --git a/sysdeps/powerpc/powerpc64/multiarch/strchrnul.c b/sysdeps/powerpc/powerpc64/multiarch/strchrnul.c
> index 94873507a6..87dd41f72d 100644
> --- a/sysdeps/powerpc/powerpc64/multiarch/strchrnul.c
> +++ b/sysdeps/powerpc/powerpc64/multiarch/strchrnul.c
> @@ -27,13 +27,13 @@ extern __typeof (__strchrnul) __strchrnul_power8 attribute_hidden;
>
> /* Avoid DWARF definition DIE on ifunc symbol so that GDB can handle
> ifunc symbol properly. */
> -libc_ifunc (__strchrnul,
> - (hwcap2 & PPC_FEATURE2_ARCH_2_07
> - && hwcap & PPC_FEATURE_HAS_ALTIVEC)
> - ? __strchrnul_power8 :
> - (hwcap & PPC_FEATURE_ARCH_2_06)
> - ? __strchrnul_power7
> - : __strchrnul_ppc);
> +libc_ifunc_hidden (__strchrnul, __strchrnul,
> + (hwcap2 & PPC_FEATURE2_ARCH_2_07
> + && hwcap & PPC_FEATURE_HAS_ALTIVEC)
> + ? __strchrnul_power8 :
> + (hwcap & PPC_FEATURE_ARCH_2_06)
> + ? __strchrnul_power7
> + : __strchrnul_ppc);
>
> libc_hidden_def (__strchrnul)
> weak_alias (__strchrnul, strchrnul)
@@ -27,13 +27,13 @@ extern __typeof (__strchrnul) __strchrnul_power8 attribute_hidden;
/* Avoid DWARF definition DIE on ifunc symbol so that GDB can handle
ifunc symbol properly. */
-libc_ifunc (__strchrnul,
- (hwcap2 & PPC_FEATURE2_ARCH_2_07
- && hwcap & PPC_FEATURE_HAS_ALTIVEC)
- ? __strchrnul_power8 :
- (hwcap & PPC_FEATURE_ARCH_2_06)
- ? __strchrnul_power7
- : __strchrnul_ppc);
+libc_ifunc_hidden (__strchrnul, __strchrnul,
+ (hwcap2 & PPC_FEATURE2_ARCH_2_07
+ && hwcap & PPC_FEATURE_HAS_ALTIVEC)
+ ? __strchrnul_power8 :
+ (hwcap & PPC_FEATURE_ARCH_2_06)
+ ? __strchrnul_power7
+ : __strchrnul_ppc);
libc_hidden_def (__strchrnul)
weak_alias (__strchrnul, strchrnul)