https://sourceware.org/bugzilla/show_bug.cgi?id=21382
Bug ID: 21382
Summary: --as-needed cannot be combined with -flto
Product: binutils
Version: 2.29 (HEAD)
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: dilyan.palauzov at aegee dot org
Target Milestone: ---
Created attachment 9991
--> https://sourceware.org/bugzilla/attachment.cgi?id=9991&action=edit
Sample
With the attached package I do ./configure and
make clean && make LDFLAGS="-Wl,--as-needed" && ./m -- works, prints x
make clean && CFLAGS="-flto" make && ./m -- works, prints x
make clean && make CFLAGS="-flto" LDFLAGS="-Wl,--as-needed" && ./m -- does not
work, prints x-0.libs/lt-m: symbol lookup error: x-0/.libs/libx.so.0: undefined
symbol: x
Why doesn't --as-needed work with LTO?
It happens when I use GNU ld (GNU Binutils) 2.28.51.20170411 with either GCC
7.0.1 20170411 or GCC 6.3.1 20170329.
As of https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80407 it is not gcc bug and
does not happen with gold.
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