On Tue, 2021-07-27 at 09:36 -0400, Tony Battersby wrote: > -f*-prefix-map flags are required when linking with LTO enabled to make > the output binary reproducible. > > See discussion here: > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101473 > > [YOCTO #14481] > > Signed-off-by: Tony Battersby <to...@cybernetics.com> > --- > > /usr/sbin/lspci from pciutils is a good program to test that shows how > adding -f*-prefix-map to LDFLAGS makes a program binary reproducible > with LTO enabled. > > meta/conf/bitbake.conf | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/meta/conf/bitbake.conf b/meta/conf/bitbake.conf > index 160abf40ee..c0d2e3f82f 100644 > --- a/meta/conf/bitbake.conf > +++ b/meta/conf/bitbake.conf > @@ -595,7 +595,7 @@ TARGET_LINK_HASH_STYLE ?= > "${@['-Wl,--hash-style=gnu',''][d.getVar('LINKER_HASH_ > ASNEEDED ?= "-Wl,--as-needed" > > > export LDFLAGS = "${TARGET_LDFLAGS}" > -TARGET_LDFLAGS = "-Wl,-O1 ${TARGET_LINK_HASH_STYLE} ${ASNEEDED}" > +TARGET_LDFLAGS = "-Wl,-O1 ${TARGET_LINK_HASH_STYLE} ${ASNEEDED} > ${DEBUG_PREFIX_MAP}" > # mips does not support GNU hash style therefore we override > LINKER_HASH_STYLE_mipsarch_libc-musl = "sysv" >
This failed in testing in ruby: https://autobuilder.yoctoproject.org/typhoon/#/builders/115/builds/514 The error is a bit obtuse but in summary, the file: /tmp/work/core2-64-poky-linux/ruby/3.0.2-r0/sysroot-destdir/usr/lib/pkgconfig/ruby-3.0.pc contained build paths as it adds LDFLAGS to the file with a line like: DLDFLAGS=-Wl,-O1 -Wl,--hash-style=gnu -Wl,--as-needed -fmacro-prefix-map=/home/pokybuild/yocto- worker/reproducible-centos/build/build-st/reproducibleA/tmp/work/core2-64-poky-linux/ruby/3.0.2- r0=/usr/src/debug/ruby/3.0.2-r0 -fdebug-prefix-map=/home/pokybuild/yocto-worker/reproducible- centos/build/build-st/reproducibleA/tmp/work/core2-64-poky-linux/ruby/3.0.2-r0=/usr/src/debug/ruby/3.0.2-r0 - fdebug-prefix-map=/home/pokybuild/yocto-worker/reproducible-centos/build/build- st/reproducibleA/tmp/work/core2-64-poky-linux/ruby/3.0.2-r0/recipe-sysroot= -fdebug-prefix- map=/home/pokybuild/yocto-worker/reproducible-centos/build/build-st/reproducibleA/tmp/work/core2-64-poky- linux/ruby/3.0.2-r0/recipe-sysroot-native= -Wl,-z,relro,-z,now -Wl,--compress-debug-sections=zlib Cheers, Richard
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