[LLVMbugs] [Bug 9825] New: Need both -fno-omit-frame-pointer and -mno-omit-leaf-frame-pointer to get a fp on linux on a leaf function

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=9825

           Summary: Need both -fno-omit-frame-pointer and
                    -mno-omit-leaf-frame-pointer to get a fp on linux on a
                    leaf function
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Driver
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: rafael.espindola at gmail.com
                CC: llvmbugs at cs.uiuc.edu


$ cat test.c
int f() {
  return 42;
}
$ gcc -S /home/espindola/llvm/test.c -Os -fno-omit-frame-pointer -o - | grep
rbp
    pushq    %rbp
    movq    %rsp, %rbp
$ ./bin/clang -S /home/espindola/llvm/test.c -Os -fno-omit-frame-pointer -o - |
grep rbp
$ ./bin/clang -S /home/espindola/llvm/test.c -Os -fno-omit-frame-pointer
-mno-omit-leaf-frame-pointer -o - | grep rbp
    pushq    %rbp
    movq    %rsp, %rbp
    popq    %rbp

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