https://bugs.llvm.org/show_bug.cgi?id=52001
Bug ID: 52001
Summary: 13.0.0-rc4: cland fails on linking againdt llvm which
is LTO optiomised
Product: clang
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: -New Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected]
Created attachment 25303
--> https://bugs.llvm.org/attachment.cgi?id=25303&action=edit
clang build log
With 12.0.x was possible to build clabg against llvm which vinaries where LTO
optimised and looks like now it is no longer possible.
As long as llvm is build without using LTO everything is fine.
Whole build fails on linking because `undefined reference` to many llvm::*
symbpols
Build log from buuilding my clang rpm package is in attacment
I;m usiung gcc 11.2.1 from fedora rawhide and noth llvm and clang packages are
build with below env variables adding LTO optiomisation:
[tkloczko@barrel SPECS]$ rpm -E %set_build_flags
CFLAGS="-O2 -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
-fdata-sections -ffunction-sections -flto=auto -flto-partition=none";
CXXFLAGS="-O2 -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
-fdata-sections -ffunction-sections -flto=auto -flto-partition=none";
FFLAGS="-O2 -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
-fdata-sections -ffunction-sections -flto=auto -flto-partition=none
-I/usr/lib64/gfortran/modules";
FCFLAGS="-O2 -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
-fdata-sections -ffunction-sections -flto=auto -flto-partition=none
-I/usr/lib64/gfortran/modules";
LDFLAGS="-Wl,-z,relro -Wl,--as-needed -Wl,--gc-sections -Wl,-z,now
-specs=/usr/lib/rpm/redhat/redhat-hardened-ld -flto=auto -flto-partition=none
-fuse-linker-plugin";
CC="/usr/bin/gcc"; CXX="/usr/bin/g++"; FC="/usr/bin/gfortran";
AR="/usr/bin/gcc-ar"; NM="/usr/bin/gcc-nm"; RANLIB="/usr/bin/gcc-ranlib";
export CFLAGS CXXFLAGS FFLAGS FCFLAGS LDFLAGS CC CXX FC AR NM RANLIB;
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