https://sourceware.org/bugzilla/show_bug.cgi?id=26169
Bug ID: 26169
Summary: --dependency-file generates dependencies on
unnecessary shared libraries
Product: binutils
Version: 2.35 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: hjl.tools at gmail dot com
CC: roland at gnu dot org
Target Milestone: ---
Created attachment 12659
--> https://sourceware.org/bugzilla/attachment.cgi?id=12659&action=edit
A testcase
[hjl@gnu-cfl-2 foo]$ gcc -m32 -shared -Wl,-soname,libbar.so -o libbar.so
bar.c -fPIC
[hjl@gnu-cfl-2 foo]$ make
gcc -B./ -fPIC -c -o foo.o foo.c
gcc -B./ -fPIC -c -o bar.o bar.c
mkdir -p 64
gcc -B./ -shared -Wl,-soname,libbar.so -o 64/libbar.so bar.o
gcc -B./ -shared -o libfoo.so foo.o 64/libbar.so
gcc -B./ -c -o a.o a.c
gcc -B./ -o a a.o -L. -L64 -lfoo -Wl,-R,.:64,--dependency-file,a.dep
./a
Hello
[hjl@gnu-cfl-2 foo]$ rm libbar.so
[hjl@gnu-cfl-2 foo]$ make
gcc -B./ -o a a.o -L. -L64 -lfoo -Wl,-R,.:64,--dependency-file,a.dep
^^^^^^^^^^^^^^ This rebuild is unnecessary.
./a
Hello
[hjl@gnu-cfl-2 foo]$ make
./a
Hello
[hjl@gnu-cfl-2 foo]$
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