[PATCH] cargo: Increase RUST_MIN_STACK size to avoid SIGSEGV in DEBUG builds only.

[Yash.Shinde@windriver.com]

From: Yash Shinde <Yash.Shinde@windriver.com>

For some Rust crates, like building p384 in DEBUG mode, a SIGSEGV
is encountered as follows:

     note: rustc unexpectedly overflowed its stack! this is a bug
     note: maximum backtrace depth reached, frames may have been lost
     note: we would appreciate a report at https://github.com/rust-lang/rust
     note: backtrace dumped due to SIGSEGV! resuming signal
     error: could not compile `p384` (lib)

WARNING: Backtrace (BB generated script):
        #1: oe_cargo_build, /home/poky/build/tmp/work/core2-32-wrs-linux/cargo/1.79.0/temp/run.do_compile.3262358, line 193
        #2: cargo_do_compile, /home/poky/build/tmp/work/core2-32-wrs-linux/cargo/1.79.0/temp/run.do_compile.3262358, line 165
        #3: do_compile, /home/poky/build/tmp/work/core2-32-wrs-linux/cargo/1.79.0/temp/run.do_compile.3262358, line 160
        #4: main, /home/poky/build/tmp/work/core2-32-wrs-linux/cargo/1.79.0/temp/run.do_compile.3262358, line 206

Setting RUST_MIN_STACK to 8MB conditionally for DEBUG builds only handles
the stack overflow and SIGSEGV.

References: https://github.com/esp-rs/rust/issues/214
            https://github.com/rust-lang/rust/issues/122357
            https://github.com/rust-lang/rust/pull/122847#issue-2201254359
            https://github.com/rust-lang/rust/pull/122847/commits

Signed-off-by: Yash Shinde <Yash.Shinde@windriver.com>
---
 meta/recipes-devtools/rust/cargo_1.79.0.bb | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/meta/recipes-devtools/rust/cargo_1.79.0.bb b/meta/recipes-devtools/rust/cargo_1.79.0.bb
index 123032cdf7..4917b25c0c 100644
--- a/meta/recipes-devtools/rust/cargo_1.79.0.bb
+++ b/meta/recipes-devtools/rust/cargo_1.79.0.bb
@@ -37,6 +37,9 @@ do_cargo_setup_snapshot[vardepsexclude] += "UNINATIVE_LOADER"
 
 do_compile:prepend () {
 	export RUSTC_BOOTSTRAP="1"
+	if [ "${DEBUG_BUILD}" = "1" ]; then
+		export RUST_MIN_STACK=8388608
+	fi
 }
 
 do_install () {
-- 
2.43.0