for example:

src_compile() {
        cargo_src_compile $(usex pcre "--features pcre2" "")"
}

Signed-off-by: Georgy Yakovlev <gyakov...@gentoo.org>
---
 eclass/cargo.eclass | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/eclass/cargo.eclass b/eclass/cargo.eclass
index 50f7830c51b..06c85ce9de8 100644
--- a/eclass/cargo.eclass
+++ b/eclass/cargo.eclass
@@ -1,4 +1,4 @@
-# Copyright 1999-2018 Gentoo Authors
+# Copyright 1999-2019 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 # @ECLASS: cargo.eclass
@@ -122,7 +122,7 @@ cargo_src_compile() {
 
        export CARGO_HOME="${ECARGO_HOME}"
 
-       cargo build -j $(makeopts_jobs) $(usex debug "" --release) \
+       cargo build -j $(makeopts_jobs) $(usex debug "" --release) "$@" \
                || die "cargo build failed"
 }
 
@@ -132,7 +132,7 @@ cargo_src_compile() {
 cargo_src_install() {
        debug-print-function ${FUNCNAME} "$@"
 
-       cargo install -j $(makeopts_jobs) --root="${D}/usr" $(usex debug 
--debug "") \
+       cargo install -j $(makeopts_jobs) --root="${D}/usr" $(usex debug 
--debug "") "$@" \
                || die "cargo install failed"
        rm -f "${D}/usr/.crates.toml"
 
-- 
2.20.1


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