[PATCH 1/2] meson/mlx5: Suppress -Wunused-value diagnostic

[PATCH 1/2] meson/mlx5: Suppress -Wunused-value diagnostic

[Sebastian Brzezinka]

From: Alexey Marchuk <alexeymar@mellanox.com>

mlx5 common library checks if several symbols/definitions
are presented in system header files. If some are not
presented, they will be enabled by mlx5_glue library.
The problem appears with clang and '-Werror' - code
generated by meson is not compiled due to unused variable:

Code:

        #include <infiniband/mlx5dv.h>
        int main(void) {
            /* If it's not defined as a macro, try to use as a symbol */
            #ifndef mlx5dv_create_flow_action_packet_reformat
                mlx5dv_create_flow_action_packet_reformat;
            #endif
            return 0;
        }
Compiler stdout:

Compiler stderr:
 /hpc/local/work/alexeymar/repo/spdk/dpdk/build-tmp/meson-private/tmp5obnak86/testfile.c:6:17: error: expression result unused [-Werror,-Wunused-value]
                mlx5dv_create_flow_action_packet_reformat;
                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

As result, almost all symbols are enabled in mlx5_glue while
they exist is system headers. As result, we get multiple
symbols redefenitions when we compile mlx5_common.
As a solution for this problem we can suppress
-Wunused-vaurable using pragma

DPDK 23.11 note:
Starting with commit below, all cflags are passed to the has_header_symbol().
(33d6694) build: use C11 standard
To make sure that the symbol is properly detected, the pedantic flags needs to
be removed.

Signed-off-by: Alexey Marchuk <alexeymar@mellanox.com>
Signed-off-by: Sebastian Brzezinka <sebastian.brzezinka@intel.com>
---
 drivers/common/mlx5/linux/meson.build | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/common/mlx5/linux/meson.build b/drivers/common/mlx5/linux/meson.build
index cdee40c553..f3b8e5741b 100644
--- a/drivers/common/mlx5/linux/meson.build
+++ b/drivers/common/mlx5/linux/meson.build
@@ -209,7 +209,11 @@ if  libmtcr_ul_found
 endif
 
 foreach arg:has_sym_args
-    mlx5_config.set(arg[0], cc.has_header_symbol(arg[1], arg[2], dependencies: libs, args: cflags))
+    file_prefix = '#pragma clang diagnostic ignored "-Wunused-value"'
+    cflags += [
+            '-Wno-pedantic',
+    ]
+    mlx5_config.set(arg[0], cc.has_header_symbol(arg[1], arg[2], prefix : file_prefix, dependencies: libs, args: cflags))
 endforeach
 foreach arg:has_member_args
     file_prefix = '#include <' + arg[1] + '>'
-- 
2.34.1

[PATCH 2/2] ARM64: Cross-Compilation Support

[Sebastian Brzezinka]

From: Krishna Kanth Reddy <krish.reddy@samsung.com>

Modified the Configuration file to use the latest ARM Cross-Compiler.

Fixed the linker errors for the undefined references to the APIs
isal_deflate_init, isal_deflate, isal_inflate_init, isal_inflate,
isal_inflate_stateless, isal_deflate_stateless,
isal_deflate_set_hufftables in the case of ARM Cross-Compilation.

Signed-off-by: Krishna Kanth Reddy <krish.reddy@samsung.com>
Signed-off-by: Sebastian Brzezinka <sebastian.brzezinka@intel.com>
---
 config/arm/arm64_armv8_linux_gcc  | 10 +++++-----
 drivers/compress/isal/meson.build |  4 ++++
 2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/config/arm/arm64_armv8_linux_gcc b/config/arm/arm64_armv8_linux_gcc
index 529694b49d..6dfb8aa206 100644
--- a/config/arm/arm64_armv8_linux_gcc
+++ b/config/arm/arm64_armv8_linux_gcc
@@ -1,9 +1,9 @@
 [binaries]
-c = ['ccache', 'aarch64-linux-gnu-gcc']
-cpp = ['ccache', 'aarch64-linux-gnu-g++']
-ar = 'aarch64-linux-gnu-gcc-ar'
-strip = 'aarch64-linux-gnu-strip'
-pkgconfig = 'aarch64-linux-gnu-pkg-config'
+c = ['ccache', 'aarch64-none-linux-gnu-gcc']
+cpp = ['ccache', 'aarch64-none-linux-gnu-cpp']
+ar = 'aarch64-none-linux-gnu-gcc-ar'
+strip = 'aarch64-none-linux-gnu-strip'
+pkgconfig = 'aarch64-none-linux-gnu-pkg-config'
 pcap-config = ''
 
 [host_machine]
diff --git a/drivers/compress/isal/meson.build b/drivers/compress/isal/meson.build
index 4b3eaa2274..b3cc990053 100644
--- a/drivers/compress/isal/meson.build
+++ b/drivers/compress/isal/meson.build
@@ -5,6 +5,10 @@ dep = dependency('libisal', required: false, method: 'pkg-config')
 if not dep.found()
     build = false
     reason = 'missing dependency, "libisal"'
+    isal_dep = cc.find_library('libisal', required: false)
+    if isal_dep.found()
+        ext_deps += isal_dep
+    endif
 endif
 
 deps += 'bus_vdev'
-- 
2.34.1

Re: [PATCH 2/2] ARM64: Cross-Compilation Support

[Jerin Jacob]

On Fri, Apr 12, 2024 at 4:43 PM Sebastian Brzezinka
<sebastian.brzezinka@intel.com> wrote:
>
> From: Krishna Kanth Reddy <krish.reddy@samsung.com>
>
> Modified the Configuration file to use the latest ARM Cross-Compiler.
>
> Fixed the linker errors for the undefined references to the APIs
> isal_deflate_init, isal_deflate, isal_inflate_init, isal_inflate,
> isal_inflate_stateless, isal_deflate_stateless,
> isal_deflate_set_hufftables in the case of ARM Cross-Compilation.
>
> Signed-off-by: Krishna Kanth Reddy <krish.reddy@samsung.com>
> Signed-off-by: Sebastian Brzezinka <sebastian.brzezinka@intel.com>

There is comment[1] in v1. v2 is not addressed the comment nor
provided any feedback.
Also please add change log in patch(i.e what is changed from a version
to another version)

[1]
https://patches.dpdk.org/project/dpdk/patch/20240405110700.3279213-1-sebastian.brzezinka@intel.com/

> ---
>  config/arm/arm64_armv8_linux_gcc  | 10 +++++-----
>  drivers/compress/isal/meson.build |  4 ++++
>  2 files changed, 9 insertions(+), 5 deletions(-)
>
> diff --git a/config/arm/arm64_armv8_linux_gcc b/config/arm/arm64_armv8_linux_gcc
> index 529694b49d..6dfb8aa206 100644
> --- a/config/arm/arm64_armv8_linux_gcc
> +++ b/config/arm/arm64_armv8_linux_gcc
> @@ -1,9 +1,9 @@
>  [binaries]
> -c = ['ccache', 'aarch64-linux-gnu-gcc']
> -cpp = ['ccache', 'aarch64-linux-gnu-g++']
> -ar = 'aarch64-linux-gnu-gcc-ar'
> -strip = 'aarch64-linux-gnu-strip'
> -pkgconfig = 'aarch64-linux-gnu-pkg-config'
> +c = ['ccache', 'aarch64-none-linux-gnu-gcc']
> +cpp = ['ccache', 'aarch64-none-linux-gnu-cpp']
> +ar = 'aarch64-none-linux-gnu-gcc-ar'
> +strip = 'aarch64-none-linux-gnu-strip'
> +pkgconfig = 'aarch64-none-linux-gnu-pkg-config'
>  pcap-config = ''
>
>  [host_machine]
> diff --git a/drivers/compress/isal/meson.build b/drivers/compress/isal/meson.build
> index 4b3eaa2274..b3cc990053 100644
> --- a/drivers/compress/isal/meson.build
> +++ b/drivers/compress/isal/meson.build
> @@ -5,6 +5,10 @@ dep = dependency('libisal', required: false, method: 'pkg-config')
>  if not dep.found()
>      build = false
>      reason = 'missing dependency, "libisal"'
> +    isal_dep = cc.find_library('libisal', required: false)
> +    if isal_dep.found()
> +        ext_deps += isal_dep
> +    endif
>  endif
>
>  deps += 'bus_vdev'
> --
> 2.34.1
>

Re: [PATCH 2/2] ARM64: Cross-Compilation Support

[Sebastian Brzezinka]

I re-uploaded this patch to get rid of the banner added by the mail service, so there are no meaningful changes added to v2. 

> Is aarch64-none-linux* latest compiler?

According to https://developer.arm.com/downloads/-/gnu-a, there is no toolchain named aarch64-linux-gnu*. 

Re: [PATCH 2/2] ARM64: Cross-Compilation Support

[Jerin Jacob]

On Thu, May 23, 2024 at 5:56 PM Sebastian Brzezinka
<sebastian.brzezinka@intel.com> wrote:
>
> I re-uploaded this patch to get rid of the banner added by the mail service, so there are no meaningful changes added to v2.
>
> > Is aarch64-none-linux* latest compiler?
>
> According to https://developer.arm.com/downloads/-/gnu-a, there is no toolchain named aarch64-linux-gnu*.

All distribution OS packages use aarch64-linux-gnu* for cross compilation.

https://jensd.be/1126/linux/cross-compiling-for-arm-or-aarch64-on-debian-or-ubuntu