[meta-oe][PATCH v3] fluentbit: fix building with wasm support

[patrick@subset.ch]

From: Patrick Wicki <patrick.wicki@siemens.com>

Patch the cmake config of the wasm micro runtime dependency. This fixes
the build for x86 by avoiding the cmake try_run() which cannot be
invoked in cross-compiling mode.

Signed-off-by: Patrick Wicki <patrick.wicki@siemens.com>
---
 ...d-cmake-try_run-when-cross-compiling.patch | 42 +++++++++++++++++++
 .../fluentbit/fluentbit_3.1.9.bb              |  1 +
 2 files changed, 43 insertions(+)
 create mode 100644 meta-oe/recipes-extended/fluentbit/fluentbit/0004-wasm-avoid-cmake-try_run-when-cross-compiling.patch

diff --git a/meta-oe/recipes-extended/fluentbit/fluentbit/0004-wasm-avoid-cmake-try_run-when-cross-compiling.patch b/meta-oe/recipes-extended/fluentbit/fluentbit/0004-wasm-avoid-cmake-try_run-when-cross-compiling.patch
new file mode 100644
index 000000000..419e85903
--- /dev/null
+++ b/meta-oe/recipes-extended/fluentbit/fluentbit/0004-wasm-avoid-cmake-try_run-when-cross-compiling.patch
@@ -0,0 +1,42 @@
+From 5b6d274664f92a6c6083f4d27a1b1604a326f22c Mon Sep 17 00:00:00 2001
+From: Patrick Wicki <patrick.wicki@siemens.com>
+Date: Sat, 5 Oct 2024 21:36:12 +0200
+Subject: [PATCH] wasm: avoid cmake try_run when cross-compiling for x86
+
+This fixes building the wasm micro runtime used when enabling wasm
+support in fluentbit.
+cmake try_run does not work when cross-compiling because the test program
+cannot be executed:
+
+| CMake Error: try_run() invoked in cross-compiling mode, please set the following cache variables appropriately:
+|    TEST_WRGSBASE_RESULT (advanced)
+| For details see .../fluentbit/3.1.9/build/TryRunResults.cmake
+|      Write linear memory base addr to x86 GS register disabled
+| -- Configuring incomplete, errors occurred!
+
+Since we cannot run the test program, assume that the instruction is not
+available and disable the option.
+
+This patch is no longer needed once fluentbit updates WAMR, as it's been
+fixed in https://github.com/bytecodealliance/wasm-micro-runtime/pull/3066.
+
+Upstream-Status: Pending [https://github.com/fluent/fluent-bit/pull/8744]
+
+Signed-off-by: Patrick Wicki <patrick.wicki@siemens.com>
+---
+ .../build-scripts/config_common.cmake                           | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/lib/wasm-micro-runtime-WAMR-1.3.0/build-scripts/config_common.cmake b/lib/wasm-micro-runtime-WAMR-1.3.0/build-scripts/config_common.cmake
+index e73ebc85f..c2504e007 100644
+--- a/lib/wasm-micro-runtime-WAMR-1.3.0/build-scripts/config_common.cmake
++++ b/lib/wasm-micro-runtime-WAMR-1.3.0/build-scripts/config_common.cmake
+@@ -408,7 +408,7 @@ if (WAMR_BUILD_STATIC_PGO EQUAL 1)
+   add_definitions (-DWASM_ENABLE_STATIC_PGO=1)
+   message ("     AOT static PGO enabled")
+ endif ()
+-if (WAMR_DISABLE_WRITE_GS_BASE EQUAL 1)
++if (WAMR_DISABLE_WRITE_GS_BASE EQUAL 1 OR CMAKE_CROSSCOMPILING)
+   add_definitions (-DWASM_DISABLE_WRITE_GS_BASE=1)
+   message ("     Write linear memory base addr to x86 GS register disabled")
+ elseif (WAMR_BUILD_TARGET STREQUAL "X86_64"
diff --git a/meta-oe/recipes-extended/fluentbit/fluentbit_3.1.9.bb b/meta-oe/recipes-extended/fluentbit/fluentbit_3.1.9.bb
index f96e1a7ed..a70534e91 100644
--- a/meta-oe/recipes-extended/fluentbit/fluentbit_3.1.9.bb
+++ b/meta-oe/recipes-extended/fluentbit/fluentbit_3.1.9.bb
@@ -23,6 +23,7 @@ SRC_URI = "\
     file://0001-lib-Do-not-use-private-makefile-targets-in-CMakelist.patch \
     file://0002-flb_info.h.in-Do-not-hardcode-compilation-directorie.patch \
     file://0003-CMakeLists.txt-Revise-init-manager-deduction.patch \
+    file://0004-wasm-avoid-cmake-try_run-when-cross-compiling.patch \
 "
 SRC_URI:append:libc-musl = "\
     file://0004-chunkio-Link-with-fts-library-with-musl.patch \
-- 
2.47.0