[gentoo-dev] [PATCH 5/6] cargo.eclass: Shadow flag variables so that LTO filtering remains local

[James Le Cuirot]

This is currently done for Cargo by distutils-r1.eclass. The next commit
will remove that code, leaving cargo_env responsible for it.

Signed-off-by: James Le Cuirot <ch...@gentoo.org>
---
 eclass/cargo.eclass | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/eclass/cargo.eclass b/eclass/cargo.eclass
index 84f72168fbb3c..25acf010287d8 100644
--- a/eclass/cargo.eclass
+++ b/eclass/cargo.eclass
@@ -549,7 +549,16 @@ cargo_env() {
        [[ ${_CARGO_GEN_CONFIG_HAS_RUN} ]] || \
                die "FATAL: please call cargo_gen_config before using 
${FUNCNAME}"
 
+       # Shadow flag variables so that filtering below remains local.
+       local flag
+       for flag in $(all-flag-vars); do
+               local -x "${flag}=${!flag}"
+       done
+
+       # Rust extensions are incompatible with C/C++ LTO compiler see e.g.
+       # https://bugs.gentoo.org/910220
        filter-lto
+
        tc-export AR CC CXX PKG_CONFIG
 
        # Set vars for cc-rs crate.
-- 
2.45.2