On Mon, Aug 03, 2020 at 05:40:42PM +0200, Florian Weimer wrote: > * Daniel P. Berrangé: > > > If I run LD_DEBUG=all on a build /with/ LTO, there are no symbol lookups > > at all for qemuProcessStartManagedPRDaemon. It looks very much like the > > call was resolved and bound at link time when built with LTO. > > It's possible that the symbol extraction logic is confused by LTO, but > -ffat-lto-objects should prevent that. > > Can you collect all the linker input scripts/command lines after libtool > has done its thing? For the qemuhotplugtest, this should be the gcc line it is running: gcc -DHAVE_CONFIG_H -I. -I../../tests -I.. -I.. -I../.. -I../include -I../../include -I../src -I../../src -I../../src/util -I../../src/conf -I../../src/hypervisor -I../src/rpc -Dabs_builddir="\"/builddir/build/BUILD/libvirt-6.5.0/x86_64-redhat-linux-gnu/tests\"" -Dabs_top_builddir="\"/builddir/build/BUILD/libvirt-6.5.0/x86_64-redhat-linux-gnu\"" -Dabs_srcdir="\"/builddir/build/BUILD/libvirt-6.5.0/x86_64-redhat-linux-gnu/../tests\"" -Dabs_top_srcdir="\"/builddir/build/BUILD/libvirt-6.5.0/x86_64-redhat-linux-gnu/..\"" -I/usr/include/libxml2 -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -pthread -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/libnl3 -I/usr/include/libnl3 -I/usr/include/p11-kit-1 -I/usr/include/tirpc -fno-common -W -Wabsolute-value -Waddress -Waddress-of-packed-member -Waggressive-loop-optimizations -Wall -Wattribute-warning -Wattributes -Wbool-compare -Wbool-operation -Wbuiltin-declaration-mismatch -Wbuiltin-macro-redefined -Wcannot-profile -Wcast-align -Wcast-align=strict -Wcast-function-type -Wchar-subscripts -Wclobbered -Wcomment -Wcomments -Wcoverage-mismatch -Wcpp -Wdangling-else -Wdate-time -Wdeprecated-declarations -Wdesignated-init -Wdiscarded-array-qualifiers -Wdiscarded-qualifiers -Wdiv-by-zero -Wdouble-promotion -Wduplicated-cond -Wduplicate-decl-specifier -Wempty-body -Wendif-labels -Wexpansion-to-defined -Wextra -Wformat-contains-nul -Wformat-extra-args -Wformat-nonliteral -Wformat-security -Wformat-y2k -Wformat-zero-length -Wframe-address -Wfree-nonheap-object -Whsa -Wif-not-aligned -Wignored-attributes -Wignored-qualifiers -Wimplicit -Wimplicit-function-declaration -Wimplicit-int -Wincompatible-pointer-types -Winit-self -Winline -Wint-conversion -Wint-in-bool-context -Wint-to-pointer-cast -Winvalid-memory-model -Winvalid-pch -Wlogical-not-parentheses -Wlogical-op -Wmain -Wmaybe-uninitialized -Wmemset-elt-size -Wmemset-transposed-args -Wmisleading-indentation -Wmissing-attributes -Wmissing-braces -Wmissing-declarations -Wmissing-field-initializers -Wmis sing-include-dirs -Wmissing-parameter-type -Wmissing-profile -Wmissing-prototypes -Wmultichar -Wmultistatement-macros -Wnarrowing -Wnested-externs -Wnonnull -Wnonnull-compare -Wnull-dereference -Wodr -Wold-style-declaration -Wold-style-definition -Wopenmp-simd -Woverflow -Woverride-init -Wpacked-bitfield-compat -Wpacked-not-aligned -Wparentheses -Wpointer-arith -Wpointer-compare -Wpointer-sign -Wpointer-to-int-cast -Wpragmas -Wpsabi -Wrestrict -Wreturn-local-addr -Wreturn-type -Wscalar-storage-order -Wsequence-point -Wshadow -Wshift-count-negative -Wshift-count-overflow -Wshift-negative-value -Wsizeof-array-argument -Wsizeof-pointer-div -Wsizeof-pointer-memaccess -Wstrict-aliasing -Wstrict-prototypes -Wstringop-truncation -Wsuggest-attribute=cold -Wsuggest-attribute=const -Wsuggest-attribute=format -Wsuggest-attribute=noreturn -Wsuggest-attribute=pure -Wsuggest-final-methods -Wsuggest-final-types -Wswitch -Wswitch-bool -Wswitch-unreachable -Wsync-nand -Wtautological-compare -Wtrampolines -Wtrigraphs -Wtype-limits -Wuninitialized -Wunknown-pragmas -Wunused -Wunused-but-set-parameter -Wunused-but-set-variable -Wunused-function -Wunused-label -Wunused-local-typedefs -Wunused-parameter -Wunused-result -Wunused-value -Wunused-variable -Wvarargs -Wvariadic-macros -Wvector-operation-performance -Wvla -Wvolatile-register-var -Wwrite-strings -Walloc-size-larger-than=9223372036854775807 -Warray-bounds=2 -Wattribute-alias=2 -Wformat-overflow=2 -Wformat-truncation=2 -Wimplicit-fallthrough=5 -Wnormalized=nfc -Wshift-overflow=2 -Wstringop-overflow=2 -Wunused-const-variable=2 -Wvla-larger-than=4031 -Wno-sign-compare -Wno-cast-function-type -Wjump-misses-init -Wswitch-enum -Wno-format-nonliteral -Wno-format-truncation -Wframe-larger-than=4096 -fstack-protector-strong -fexceptions -fasynchronous-unwind-tables -fipa-pure-const -Wno-suggest-attribute=pure -Wno-suggest-attribute=const -std=gnu99 -Wframe-larger-than=262144 -O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,- D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -MT qemuhotplugtest.o -MD -MP -MF $depbase.Tpo -c -o qemuhotplugtest.o ../../tests/qemuhotplugtest.c &&\ Taken from https://koji.fedoraproject.org/koji/taskinfo?taskID=48525923 I can "fix" the probem by simply appending "-fno-lto" to this line for the qemuhotplugtest binary only. I don't need to turn off LTO for any other parts of the build that this links to, or preloads. Regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :| _______________________________________________ devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@xxxxxxxxxxxxxxxxxxxxxxx
