[v2] meson: Use -fno-sanitize=function when available

Commit 23ef50ae2d0c (".gitlab-ci.d/buildtest.yml: Use
-fno-sanitize=function in the clang-system job") adds
-fno-sanitize=function for the CI but doesn't add the flag in the
other context. Add it to meson.build for such. It is not removed from
.gitlab-ci.d/buildtest.yml because -fno-sanitize=function in meson.build
does not affect --extra-cflags due to argument ordering.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
---
Changes in v2:
- Dropped the change of: .gitlab-ci.d/buildtest.yml
- Link to v1: https://lore.kernel.org/r/20240714-function-v1-1-cc2acb4171ba@daynix.com
---
 meson.build                | 1 +
 .gitlab-ci.d/buildtest.yml | 1 -
 2 files changed, 1 insertion(+), 1 deletion(-)


---
base-commit: 93b799fafd9170da3a79a533ea6f73a18de82e22
change-id: 20240714-function-7d32c723abbc

Best regards,

On 7/29/24 01:44, Akihiko Odaki wrote:
> Commit 23ef50ae2d0c (".gitlab-ci.d/buildtest.yml: Use
> -fno-sanitize=function in the clang-system job") adds
> -fno-sanitize=function for the CI but doesn't add the flag in the
> other context. Add it to meson.build for such. It is not removed from
> .gitlab-ci.d/buildtest.yml because -fno-sanitize=function in meson.build
> does not affect --extra-cflags due to argument ordering.
> 
> Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
> ---
> Changes in v2:
> - Dropped the change of: .gitlab-ci.d/buildtest.yml
> - Link to v1: https://lore.kernel.org/r/20240714-function-v1-1-cc2acb4171ba@daynix.com
> ---
>   meson.build                | 1 +
>   .gitlab-ci.d/buildtest.yml | 1 -
>   2 files changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/meson.build b/meson.build
> index 5613b62a4f42..a4169c572ba9 100644
> --- a/meson.build
> +++ b/meson.build
> @@ -609,6 +609,7 @@ if host_os != 'openbsd' and \
>   endif
>   
>   qemu_common_flags += cc.get_supported_arguments(hardening_flags)
> +qemu_common_flags += cc.get_supported_arguments('-fno-sanitize=function')
>   
>   add_global_arguments(qemu_common_flags, native: false, language: all_languages)
>   add_global_link_arguments(qemu_ldflags, native: false, language: all_languages)
> diff --git a/.gitlab-ci.d/buildtest.yml b/.gitlab-ci.d/buildtest.yml
> index aa327824052d..d83e50abd933 100644
> --- a/.gitlab-ci.d/buildtest.yml
> +++ b/.gitlab-ci.d/buildtest.yml
> @@ -430,7 +430,6 @@ clang-system:
>       IMAGE: fedora
>       CONFIGURE_ARGS: --cc=clang --cxx=clang++
>         --extra-cflags=-fsanitize=undefined --extra-cflags=-fno-sanitize-recover=undefined
> -      --extra-cflags=-fno-sanitize=function
>       TARGETS: alpha-softmmu arm-softmmu m68k-softmmu mips64-softmmu s390x-softmmu
>       MAKE_CHECK_ARGS: check-qtest check-tcg
>   
> 
> ---
> base-commit: 93b799fafd9170da3a79a533ea6f73a18de82e22
> change-id: 20240714-function-7d32c723abbc
> 
> Best regards,

Doesn't work, because --extra-cflags comes last and overrides it.

I think we need to drop -fsanitize=undefined from --extra-cflags as well, and use 
--enable-sanitizers.  I think it should be ok to leave -fno-sanitize-recover=undefined in 
extra.


r~

On 28/07/2024 17.44, Akihiko Odaki wrote:
> Commit 23ef50ae2d0c (".gitlab-ci.d/buildtest.yml: Use
> -fno-sanitize=function in the clang-system job") adds
> -fno-sanitize=function for the CI but doesn't add the flag in the
> other context. Add it to meson.build for such. It is not removed from
> .gitlab-ci.d/buildtest.yml because -fno-sanitize=function in meson.build
> does not affect --extra-cflags due to argument ordering.
> 
> Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
> ---
> Changes in v2:
> - Dropped the change of: .gitlab-ci.d/buildtest.yml
> - Link to v1: https://lore.kernel.org/r/20240714-function-v1-1-cc2acb4171ba@daynix.com
> ---
>   meson.build                | 1 +
>   .gitlab-ci.d/buildtest.yml | 1 -
>   2 files changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/meson.build b/meson.build
> index 5613b62a4f42..a4169c572ba9 100644
> --- a/meson.build
> +++ b/meson.build
> @@ -609,6 +609,7 @@ if host_os != 'openbsd' and \
>   endif
>   
>   qemu_common_flags += cc.get_supported_arguments(hardening_flags)
> +qemu_common_flags += cc.get_supported_arguments('-fno-sanitize=function')
>   
>   add_global_arguments(qemu_common_flags, native: false, language: all_languages)
>   add_global_link_arguments(qemu_ldflags, native: false, language: all_languages)
> diff --git a/.gitlab-ci.d/buildtest.yml b/.gitlab-ci.d/buildtest.yml
> index aa327824052d..d83e50abd933 100644
> --- a/.gitlab-ci.d/buildtest.yml
> +++ b/.gitlab-ci.d/buildtest.yml
> @@ -430,7 +430,6 @@ clang-system:
>       IMAGE: fedora
>       CONFIGURE_ARGS: --cc=clang --cxx=clang++
>         --extra-cflags=-fsanitize=undefined --extra-cflags=-fno-sanitize-recover=undefined
> -      --extra-cflags=-fno-sanitize=function

I'm confused, in the patch description you say that buildtest.yml does not 
get changed anymore, but this hunk here does it anyway? Did you maybe send 
out v1 by accident again?

  Thomas

On 29/07/2024 01.54, Richard Henderson wrote:
> On 7/29/24 01:44, Akihiko Odaki wrote:
>> Commit 23ef50ae2d0c (".gitlab-ci.d/buildtest.yml: Use
>> -fno-sanitize=function in the clang-system job") adds
>> -fno-sanitize=function for the CI but doesn't add the flag in the
>> other context. Add it to meson.build for such. It is not removed from
>> .gitlab-ci.d/buildtest.yml because -fno-sanitize=function in meson.build
>> does not affect --extra-cflags due to argument ordering.
>>
>> Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
>> ---
>> Changes in v2:
>> - Dropped the change of: .gitlab-ci.d/buildtest.yml
>> - Link to v1: 
>> https://lore.kernel.org/r/20240714-function-v1-1-cc2acb4171ba@daynix.com
>> ---
>>   meson.build                | 1 +
>>   .gitlab-ci.d/buildtest.yml | 1 -
>>   2 files changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/meson.build b/meson.build
>> index 5613b62a4f42..a4169c572ba9 100644
>> --- a/meson.build
>> +++ b/meson.build
>> @@ -609,6 +609,7 @@ if host_os != 'openbsd' and \
>>   endif
>>   qemu_common_flags += cc.get_supported_arguments(hardening_flags)
>> +qemu_common_flags += cc.get_supported_arguments('-fno-sanitize=function')
>>   add_global_arguments(qemu_common_flags, native: false, language: 
>> all_languages)
>>   add_global_link_arguments(qemu_ldflags, native: false, language: 
>> all_languages)
>> diff --git a/.gitlab-ci.d/buildtest.yml b/.gitlab-ci.d/buildtest.yml
>> index aa327824052d..d83e50abd933 100644
>> --- a/.gitlab-ci.d/buildtest.yml
>> +++ b/.gitlab-ci.d/buildtest.yml
>> @@ -430,7 +430,6 @@ clang-system:
>>       IMAGE: fedora
>>       CONFIGURE_ARGS: --cc=clang --cxx=clang++
>>         --extra-cflags=-fsanitize=undefined 
>> --extra-cflags=-fno-sanitize-recover=undefined
>> -      --extra-cflags=-fno-sanitize=function
>>       TARGETS: alpha-softmmu arm-softmmu m68k-softmmu mips64-softmmu 
>> s390x-softmmu
>>       MAKE_CHECK_ARGS: check-qtest check-tcg
>>
>> ---
>> base-commit: 93b799fafd9170da3a79a533ea6f73a18de82e22
>> change-id: 20240714-function-7d32c723abbc
>>
>> Best regards,
> 
> Doesn't work, because --extra-cflags comes last and overrides it.
> 
> I think we need to drop -fsanitize=undefined from --extra-cflags as well, 
> and use --enable-sanitizers.  I think it should be ok to leave 
> -fno-sanitize-recover=undefined in extra.

That could be a solution, too, but I think the change in meson.build should 
then also be moved to the spot where -fsanitize=undefined is added.

  Thomas