Re: [PATCH v2 0/4] simplify doing 32-bit DPDK builds

[David Marchand <david.marchand@redhat.com>]

On Fri, Sep 6, 2024 at 6:13 PM Bruce Richardson
<bruce.richardson@intel.com> wrote:
>
> To make it easier to build and test DPDK on 32-bit x86 add a set of
> cross-compile ini files for a number of common linux distributions.
> This avoids the user having to remember strange meson incantations
> with '-m32' in various args values and with the PKG_CONFIG_LIBDIR
> overridden in the environment.
>
> Bruce Richardson (4):
>   config: add 32-bit x86 debian cross-compilation file
>   config: add fedora 32-bit x86 cross-compile file
>   config: add arch 32-bit cross-compilation file
>   devtools/test-meson-builds: use cross files for 32bit build
>
>  config/x86/cross-32bit-arch.ini   | 22 ++++++++++++++++++++++
>  config/x86/cross-32bit-debian.ini | 22 ++++++++++++++++++++++
>  config/x86/cross-32bit-fedora.ini | 22 ++++++++++++++++++++++
>  devtools/test-meson-builds.sh     | 13 +++++--------
>  4 files changed, 71 insertions(+), 8 deletions(-)
>  create mode 100644 config/x86/cross-32bit-arch.ini
>  create mode 100644 config/x86/cross-32bit-debian.ini
>  create mode 100644 config/x86/cross-32bit-fedora.ini

I tried to convert the GHA script to use the debian cross file
introduced in the series:

diff --git a/.ci/linux-build.sh b/.ci/linux-build.sh
index 15ed51e4c1..cec8742ed1 100755
--- a/.ci/linux-build.sh
+++ b/.ci/linux-build.sh
@@ -54,6 +54,10 @@ if [ "$AARCH64" = "true" ]; then
     fi
 fi

+if [ "$BUILD_32BIT" = "true" ]; then
+    cross_file=config/x86/cross-32bit-debian.ini
+fi
+
 if [ "$MINGW" = "true" ]; then
     cross_file=config/x86/cross-mingw
 fi
@@ -76,12 +80,6 @@ if [ "$BUILD_DOCS" = "true" ]; then
     OPTS="$OPTS -Denable_docs=true"
 fi

-if [ "$BUILD_32BIT" = "true" ]; then
-    OPTS="$OPTS -Dc_args=-m32 -Dc_link_args=-m32"
-    OPTS="$OPTS -Dcpp_args=-m32 -Dcpp_link_args=-m32"
-    export PKG_CONFIG_LIBDIR="/usr/lib32/pkgconfig"
-fi
-
 if [ "$MINGW" = "true" ]; then
     OPTS="$OPTS -Dexamples=helloworld"
 elif [ "$DEF_LIB" = "static" ]; then

I was then surprised to read the result:
...
2024-09-19T07:22:12.6485260Z Checking for size of "void *" : 8
2024-09-19T07:22:12.6485592Z Checking for size of "void *" : 8
...


*scratch* *scratch*
So I retested the series locally on my f39 (the series seemed ok so
far) but I downgraded meson to 0.53.2 (which is the version forced in
GHA) and now I observe the same issue.

I suspect something changed in the cross file handling in more recent
meson versions.
Likely, the c_args= or [build-in options] part is not read.

Am I doing something wrong?


-- 
David Marchand