[Bug 214258] devel/openmp: spurious libm dependency
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214258
Bug ID: 214258
Summary: devel/openmp: spurious libm dependency
Product: Ports & Packages
Version: Latest
Hardware: Any
OS: Any
Status: New
Keywords: needs-patch
Severity: Affects Only Me
Priority: ---
Component: Individual Port(s)
Assignee: b...@freebsd.org
Reporter: jbe...@freebsd.org
CC: freebsd-toolchain@FreeBSD.org
Flags: maintainer-feedback?(b...@freebsd.org)
Assignee: b...@freebsd.org
LLVM openmp picks up math symbols despite not using them in any of its object
files.
$ cd /usr/ports/devel/openmp
$ make install
$ cd $(make -V WRKSRC)
$ fgrep -lr scalbnl .
./runtime/src/libgomp.so
./runtime/src/libiomp5.so
./runtime/src/libomp.so
./runtime/exports/lin_32e/lib/libomp.so
$ echo 'int main() { }' | cc ./runtime/src/libomp.so -xc -
./runtime/src/libomp.so: undefined reference to `scalbnl'
./runtime/src/libomp.so: undefined reference to `fmaxl'
./runtime/src/libomp.so: undefined reference to `logbl'
./runtime/src/libomp.so: undefined reference to `scalbnf'
./runtime/src/libomp.so: undefined reference to `logb'
./runtime/src/libomp.so: undefined reference to `logbf'
./runtime/src/libomp.so: undefined reference to `scalbn'
cc: error: linker command failed with exit code 1 (use -v to see invocation)
$ echo 'int main() { }' | cc -fopenmp -L/usr/local/lib -xc -
/usr/local/lib/libomp.so: undefined reference to `scalbnl'
/usr/local/lib/libomp.so: undefined reference to `fmaxl'
/usr/local/lib/libomp.so: undefined reference to `logbl'
/usr/local/lib/libomp.so: undefined reference to `scalbnf'
/usr/local/lib/libomp.so: undefined reference to `logb'
/usr/local/lib/libomp.so: undefined reference to `logbf'
/usr/local/lib/libomp.so: undefined reference to `scalbn'
cc: error: linker command failed with exit code 1 (use -v to see invocation)
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[Bug 214258] devel/openmp: spurious libm dependency
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214258 Jan Beich (mail not working) changed: What|Removed |Added CC||b...@freebsd.org Assignee|b...@freebsd.org|freebsd-toolchain@FreeBSD.o ||rg --- Comment #1 from Jan Beich (mail not working) --- Assigning to toolchain@ in order to help bisecting base change. It affects 11.0+ but not 10.3 or 9.3. -- You are receiving this mail because: You are on the CC list for the bug. You are the assignee for the bug. ___ freebsd-toolchain@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-toolchain To unsubscribe, send any mail to "freebsd-toolchain-unsubscr...@freebsd.org"
[Bug 214258] devel/openmp: spurious libm dependency
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214258
Yuta Satoh changed:
What|Removed |Added
CC||nigoro@gmail.com
--- Comment #2 from Yuta Satoh ---
Created attachment 179304
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=179304&action=edit
ports/devel/openmp/files/patch-link-libm.patch
Sample patch for devel/openmp-3.9.0.
The attached patch links libm.
-Wl,--no-as-needed is necessary for forced linking.
Before applying the patch)
# ldd /usr/local/lib/libomp.so
/usr/local/lib/libomp.so:
libthr.so.3 => /lib/libthr.so.3 (0x801288000)
libc.so.7 => /lib/libc.so.7 (0x800823000)
After applying the patch)
# ldd /usr/local/lib/libomp.so
/usr/local/lib/libomp.so:
libm.so.5 => /lib/libm.so.5 (0x801288000)
libthr.so.3 => /lib/libthr.so.3 (0x8014b3000)
libc.so.7 => /lib/libc.so.7 (0x800823000)
$ echo 'int main() { }' | cc -fopenmp -L/usr/local/lib -xc - -v
FreeBSD clang version 3.8.0 (tags/RELEASE_380/final 262564) (based on LLVM
3.8.0)
Target: x86_64-unknown-freebsd11.0
Thread model: posix
InstalledDir: /usr/bin
"/usr/bin/cc" -cc1 -triple x86_64-unknown-freebsd11.0 -emit-obj -mrelax-all
-disable-free -disable-llvm-verifier -main-file-name - -mrelocation-model
static -mthread-model posix -mdisable-fp-elim -masm-verbose
-mconstructor-aliases -munwind-tables -target-cpu x86-64 -v -dwarf-column-info
-debugger-tuning=gdb -resource-dir /usr/bin/../lib/clang/3.8.0
-fdebug-compilation-dir /usr/home/nigoro -ferror-limit 19 -fmessage-length 172
-fopenmp -fobjc-runtime=gnustep -fdiagnostics-show-option -fcolor-diagnostics
-o /tmp/--26d632.o -x c -
clang -cc1 version 3.8.0 based upon LLVM 3.8.0 default target
x86_64-unknown-freebsd11.0
#include "..." search starts here:
#include <...> search starts here:
/usr/bin/../lib/clang/3.8.0/include
/usr/include
End of search list.
"/usr/bin/ld" --eh-frame-hdr -dynamic-linker /libexec/ld-elf.so.1
--hash-style=both --enable-new-dtags -o a.out /usr/lib/crt1.o /usr/lib/crti.o
/usr/lib/crtbegin.o -L/usr/local/lib -L/usr/lib /tmp/--26d632.o -lomp -lgcc
--as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed
/usr/lib/crtend.o /usr/lib/crtn.o
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[Bug 214258] devel/openmp: spurious libm dependency
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214258 --- Comment #3 from Jan Beich (mail not working) --- To avoid maintenance burden it'd be nice if we fix base system regression before FreeBSD 11.1-RELEASE. devel/openmp isn't the only -lomp provider. $ fetch https://computing.llnl.gov/tutorials/openMP/samples/C/omp_hello.c $ pkg install llvm37 llvm38 llvm39 llvm40 llvm-devel $ find -s /usr/local -name libomp.so /usr/local/lib/libomp.so /usr/local/llvm-devel/lib/libomp.so /usr/local/llvm37/lib/libomp.so /usr/local/llvm38/lib/libomp.so /usr/local/llvm39/lib/libomp.so /usr/local/llvm40/lib/libomp.so $ clang37 -fopenmp omp_hello.c /usr/bin/ld: cannot find -lomp clang-3.7: error: linker command failed with exit code 1 (use -v to see invocation) $ clang37 -fopenmp omp_hello.c $(llvm-config37 --ldflags) /usr/local/llvm37/lib/libomp.so: undefined reference to `scalbnl' /usr/local/llvm37/lib/libomp.so: undefined reference to `fmaxl' /usr/local/llvm37/lib/libomp.so: undefined reference to `logbl' /usr/local/llvm37/lib/libomp.so: undefined reference to `scalbnf' /usr/local/llvm37/lib/libomp.so: undefined reference to `logb' /usr/local/llvm37/lib/libomp.so: undefined reference to `logbf' /usr/local/llvm37/lib/libomp.so: undefined reference to `scalbn' clang-3.7: error: linker command failed with exit code 1 (use -v to see invocation) $ clang38 -fopenmp omp_hello.c /usr/local/llvm38/lib/libomp.so: undefined reference to `scalbnl' /usr/local/llvm38/lib/libomp.so: undefined reference to `fmaxl' /usr/local/llvm38/lib/libomp.so: undefined reference to `logbl' /usr/local/llvm38/lib/libomp.so: undefined reference to `scalbnf' /usr/local/llvm38/lib/libomp.so: undefined reference to `logb' /usr/local/llvm38/lib/libomp.so: undefined reference to `logbf' /usr/local/llvm38/lib/libomp.so: undefined reference to `scalbn' clang-3.8: error: linker command failed with exit code 1 (use -v to see invocation) $ clang39 -fopenmp omp_hello.c /usr/local/llvm39/lib/libomp.so: undefined reference to `scalbnl' /usr/local/llvm39/lib/libomp.so: undefined reference to `fmaxl' /usr/local/llvm39/lib/libomp.so: undefined reference to `logbl' /usr/local/llvm39/lib/libomp.so: undefined reference to `scalbnf' /usr/local/llvm39/lib/libomp.so: undefined reference to `logb' /usr/local/llvm39/lib/libomp.so: undefined reference to `logbf' /usr/local/llvm39/lib/libomp.so: undefined reference to `scalbn' clang-3.9: error: linker command failed with exit code 1 (use -v to see invocation) $ clang40 -fopenmp omp_hello.c /usr/local/llvm40/lib/libomp.so: undefined reference to `scalbnl' /usr/local/llvm40/lib/libomp.so: undefined reference to `fmaxl' /usr/local/llvm40/lib/libomp.so: undefined reference to `logbl' /usr/local/llvm40/lib/libomp.so: undefined reference to `scalbnf' /usr/local/llvm40/lib/libomp.so: undefined reference to `logb' /usr/local/llvm40/lib/libomp.so: undefined reference to `logbf' /usr/local/llvm40/lib/libomp.so: undefined reference to `scalbn' clang-4.0: error: linker command failed with exit code 1 (use -v to see invocation) $ clang-devel -fopenmp omp_hello.c /usr/bin/ld: cannot find -lomp clang-5.0: error: linker command failed with exit code 1 (use -v to see invocation) $ clang-devel -fopenmp omp_hello.c $(llvm-config-devel --ldflags) /usr/local/llvm-devel/lib/libomp.so: undefined reference to `scalbnl' /usr/local/llvm-devel/lib/libomp.so: undefined reference to `fmaxl' /usr/local/llvm-devel/lib/libomp.so: undefined reference to `logbl' /usr/local/llvm-devel/lib/libomp.so: undefined reference to `scalbnf' /usr/local/llvm-devel/lib/libomp.so: undefined reference to `logb' /usr/local/llvm-devel/lib/libomp.so: undefined reference to `logbf' /usr/local/llvm-devel/lib/libomp.so: undefined reference to `scalbn' clang-5.0: error: linker command failed with exit code 1 (use -v to see invocation) -- You are receiving this mail because: You are on the CC list for the bug. You are the assignee for the bug. ___ freebsd-toolchain@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-toolchain To unsubscribe, send any mail to "freebsd-toolchain-unsubscr...@freebsd.org"
[Bug 214258] devel/openmp: spurious libm dependency
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214258 --- Comment #4 from Jan Beich (mail not working) --- Comment on attachment 179304 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=179304 ports/devel/openmp/files/patch-link-libm.patch The workaround isn't really correct. FreeBSD versions before 11.0 don't really need -lm. $ clang40 -fopenmp omp_hello.c $ ldd a.out a.out: libomp.so => /usr/local/llvm40/lib/libomp.so (0x80081f000) libc.so.7 => /lib/libc.so.7 (0x800aa3000) libthr.so.3 => /lib/libthr.so.3 (0x800e5) -- You are receiving this mail because: You are the assignee for the bug. You are on the CC list for the bug. ___ freebsd-toolchain@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-toolchain To unsubscribe, send any mail to "freebsd-toolchain-unsubscr...@freebsd.org"
[Bug 214258] devel/openmp: spurious libm dependency
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214258 Jan Beich (mail not working) changed: What|Removed |Added Keywords||regression -- You are receiving this mail because: You are the assignee for the bug. You are on the CC list for the bug. ___ freebsd-toolchain@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-toolchain To unsubscribe, send any mail to "freebsd-toolchain-unsubscr...@freebsd.org"
[Bug 214258] devel/openmp: spurious libm dependency
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214258 Konstantin Belousov changed: What|Removed |Added CC||k...@freebsd.org --- Comment #5 from Konstantin Belousov --- (In reply to Jan Beich (mail not working) from comment #4) A library cannot 'pick up symbols without referencing them'. The presence of the the undefined references means that there are real references in the code. Note that existence of libm.so as a separate shared object from libc is a minor optimization. The libm services are mandated by the C standard, so the separate library is only a way to slighly reduce working set of the programs that do not need them. Linking it in is fine. If you are so intolerate to the presence of -lm in the dependency list even when symbols are not referenced, you can use '-Wl,--as-needed -lm -Wl,--no-as-needed' construct to only record DT_NEEDED fro libm.so when references actually exist. -- You are receiving this mail because: You are on the CC list for the bug. You are the assignee for the bug. ___ freebsd-toolchain@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-toolchain To unsubscribe, send any mail to "freebsd-toolchain-unsubscr...@freebsd.org"
[Bug 214258] devel/openmp: spurious libm dependency
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214258 --- Comment #6 from Jan Beich (mail not working) --- (In reply to Konstantin Belousov from comment #5) > If you are so intolerate to the presence of -lm in the dependency > list even when symbols are not referenced, you can use > '-Wl,--as-needed -lm -Wl,--no-as-needed' construct to only record > DT_NEEDED fro libm.so when references actually exist. devel/openmp already adds -Wl,--as-needed and it doesn't work because the references come either from libgcc, crt or something similar. -- You are receiving this mail because: You are on the CC list for the bug. You are the assignee for the bug. ___ freebsd-toolchain@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-toolchain To unsubscribe, send any mail to "freebsd-toolchain-unsubscr...@freebsd.org"
[Bug 214258] devel/openmp: spurious libm dependency
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214258 --- Comment #7 from Jan Beich (mail not working) --- LDFLAGS+=-Wl,--verbose diff shows: +(/usr/lib/libgcc.a)mulxc3.o +(/usr/lib/libgcc.a)mulsc3.o +(/usr/lib/libgcc.a)muldc3.o +(/usr/lib/libgcc.a)divxc3.o +(/usr/lib/libgcc.a)divsc3.o +(/usr/lib/libgcc.a)divdc3.o while nm kmp_atomic.cpp.o diff shows: - U _GLOBAL_OFFSET_TABLE_ + U __divdc3 + U __divsc3 + U __divxc3 + U __muldc3 + U __mulsc3 + U __mulxc3 but using older libgcc.a won't help: $ nm -A /poudriere/jails/103amd64/usr/lib/libgcc.a | fgrep scalbnl /poudriere/jails/103amd64/usr/lib/libgcc.a:divxc3.o: U scalbnl $ nm -A /poudriere/jails/110amd64/usr/lib/libgcc.a | fgrep scalbnl /poudriere/jails/110amd64/usr/lib/libgcc.a:divxc3.o: U scalbnl /poudriere/jails/110amd64/usr/lib/libgcc.a:divtc3.o: U scalbnl -- You are receiving this mail because: You are the assignee for the bug. You are on the CC list for the bug. ___ freebsd-toolchain@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-toolchain To unsubscribe, send any mail to "freebsd-toolchain-unsubscr...@freebsd.org"
[Bug 214258] devel/openmp: spurious libm dependency
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214258 --- Comment #8 from Konstantin Belousov --- (In reply to Jan Beich (mail not working) from comment #7) Which means that libm is really needed. -- You are receiving this mail because: You are the assignee for the bug. You are on the CC list for the bug. ___ freebsd-toolchain@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-toolchain To unsubscribe, send any mail to "freebsd-toolchain-unsubscr...@freebsd.org"
[Bug 214258] devel/openmp: spurious libm dependency
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214258 --- Comment #9 from Jan Beich (mail not working) --- Maybe but cc -E doesn't show any calls to __divdc3 et al. -- You are receiving this mail because: You are on the CC list for the bug. You are the assignee for the bug. ___ freebsd-toolchain@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-toolchain To unsubscribe, send any mail to "freebsd-toolchain-unsubscr...@freebsd.org"
[Bug 214258] devel/openmp: spurious libm dependency
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214258 --- Comment #10 from Konstantin Belousov --- (In reply to Jan Beich (mail not working) from comment #9) Why it should ? The symbols like __divdc3 are referenced by a compiler-generated code, for instance the __divdc3 definition is complex double __divdc3 (double a, double b, double c, double d) with the semantic of return ((a + i * b) / (c + i * d)), where i is imaginary one. The source code should contain complex division operation, not __divdc3 call, to get the reference. -- You are receiving this mail because: You are on the CC list for the bug. You are the assignee for the bug. ___ freebsd-toolchain@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-toolchain To unsubscribe, send any mail to "freebsd-toolchain-unsubscr...@freebsd.org"
[Bug 214258] devel/openmp: spurious libm dependency
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214258 --- Comment #11 from Jan Beich (mail not working) --- Because if compiler emits undefined references the linker cannot be expected to know when -lm is required. Looking at contrib/llvm/tools/clang/lib/Driver/Tools.cpp there are already cases when -lm is passed together with --no-as-needed. Maybe something like https://reviews.llvm.org/D5698 added one more case. -- You are receiving this mail because: You are on the CC list for the bug. You are the assignee for the bug. ___ freebsd-toolchain@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-toolchain To unsubscribe, send any mail to "freebsd-toolchain-unsubscr...@freebsd.org"
[Bug 214258] devel/openmp: spurious libm dependency
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214258 Jan Beich (mail not working) changed: What|Removed |Added See Also||https://bugs.llvm.org//show ||_bug.cgi?id=32279 -- You are receiving this mail because: You are on the CC list for the bug. You are the assignee for the bug. ___ freebsd-toolchain@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-toolchain To unsubscribe, send any mail to "freebsd-toolchain-unsubscr...@freebsd.org"
[Bug 214258] devel/openmp: spurious libm dependency
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214258 Jan Beich (mail not working) changed: What|Removed |Added Resolution|--- |FIXED Status|New |Closed Blocks||210337 Assignee|freebsd-toolchain@FreeBSD.o |jbe...@freebsd.org |rg | Flags|maintainer-feedback?(bapt@F | |reeBSD.org) | --- Comment #12 from Jan Beich (mail not working) --- 2017Q2 is around the corner, so I've landed before upstream review. ;\ https://svnweb.freebsd.org/changeset/ports/437204 Referenced Bugs: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210337 [Bug 210337] [exp-run] allow libiomp for openmp when using clang on amd64 -- You are receiving this mail because: You are the assignee for the bug. You are on the CC list for the bug. ___ freebsd-toolchain@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-toolchain To unsubscribe, send any mail to "freebsd-toolchain-unsubscr...@freebsd.org"
[Bug 214258] devel/openmp: spurious libm dependency
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214258 --- Comment #13 from commit-h...@freebsd.org --- A commit references this bug: Author: jbeich Date: Wed Mar 29 14:43:30 UTC 2017 New revision: 437204 URL: https://svnweb.freebsd.org/changeset/ports/437204 Log: devel/openmp: link libomp.so against -lm for clang 3.6+ PR: 214258 Submitted by: Yuta Satoh Approved by: portmgr blanket Changes: head/devel/llvm-devel/Makefile head/devel/llvm-devel/files/openmp-patch-bug32279 head/devel/llvm37/Makefile head/devel/llvm37/files/openmp-patch-bug32279 head/devel/llvm38/Makefile head/devel/llvm38/files/openmp-patch-bug32279 head/devel/llvm39/Makefile head/devel/llvm39/files/openmp-patch-bug32279 head/devel/llvm40/Makefile head/devel/llvm40/files/openmp-patch-bug32279 head/devel/openmp/Makefile head/devel/openmp/files/patch-bug32279 -- You are receiving this mail because: You are on the CC list for the bug. ___ freebsd-toolchain@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-toolchain To unsubscribe, send any mail to "freebsd-toolchain-unsubscr...@freebsd.org"
