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Bug 1409680 - Extend --disable-debug-symbols to Rust code.
This reduces disk I/O and memory usage during build that already lacks
debugging symbols from C++ code, allowing to use more jobs on 32bit hosts.
--disable-debug-symbols build on FreeBSD 10.3 i386 (8 cores) host:
Max RSS before: libxul - 612 Mb, libgkrust - 1908 Mb
Max RSS after: libxul - 444 Mb, libgkrust - 1471 Mb
Binary before: libxul - 203 Mb, libgkrust - 732 Mb
Binary after: libxul - 123 Mb, libgkrust - 301 Mb
--- config/rules.mk.orig 2017-09-14 20:15:53 UTC
+++ config/rules.mk
@@ -906,11 +906,13 @@ ifdef MOZ_USING_SCCACHE
sccache_wrap := RUSTC_WRAPPER='$(CCACHE)'
endif
+ifdef MOZ_DEBUG_SYMBOLS
# XXX hack to work around dsymutil failing on cross-OSX builds (bug 1380381)
ifeq ($(HOST_OS_ARCH)-$(OS_ARCH),Linux-Darwin)
default_rustflags += -C debuginfo=1
else
default_rustflags += -C debuginfo=2
+endif
endif
# We use the + prefix to pass down the jobserver fds to cargo, but we
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