http://sourceware.org/bugzilla/show_bug.cgi?id=14826
Bug #: 14826
Summary: ld flag --as-needed do not remove extra link
Product: binutils
Version: 2.22
Status: NEW
Severity: normal
Priority: P2
Component: ld
AssignedTo: [email protected]
ReportedBy: [email protected]
Classification: Unclassified
Hi,
with a simple file libFoo.d ld not remove all unused link
----------------libFoo.d--------------------------
size_t add( size_t a , size_t b ){ return a + b ; }
---------------------------------------------------
without --as-needed
----------------Terminal--------------------------
$ ldc2 -shared libFoo.d -of libFoo.so.1 -soname=libFoo.so.1 -v | grep gcc
/usr/lib64/ccache/gcc libFoo.so.o -shared -o libFoo.so.1 -Xlinker -L/usr/lib64
-Xlinker -lphobos-ldc -lrt -ldl -lpthread -lm -m64 -Wl,-soname,libFoo.so.1
$ ldd -r -u libFoo.so.1
Unused direct dependencies:
/lib64/librt.so.1
/lib64/libdl.so.2
/lib64/libpthread.so.0
/lib64/libm.so.6
---------------------------------------------------
whith
----------------Terminal--------------------------
$ ldc2 -shared libFoo.d -of libFoo.so.1 -soname=libFoo.so.1 -v -L--as-needed|
grep gcc
/usr/lib64/ccache/gcc libFoo.so.o -shared -o libFoo.so.1 -Xlinker --as-needed
-Xlinker -L/usr/lib64 -Xlinker -lphobos-ldc -lrt -ldl -lpthread -lm -m64
-Wl,-soname,libFoo.so.1
$ ldd -r -u libFoo.so.1
Unused direct dependencies:
/lib64/librt.so.1
/lib64/libdl.so.2
/lib64/libm.so.6
---------------------------------------------------
The we see here that --as-needed is able to remove only one unused link
libpthread . Why is not able to do same for others ?
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