[Bug ld/26169] New: --dependency-file generates dependencies on unnecessary shared libraries

[hjl.tools at gmail dot com]

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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