| Summary: | [5.0 regression] test case g++.dg/ext/arm-fp16/fp16-mangle-1.C failed on ARM | ||
|---|---|---|---|
| Product: | gcc | Reporter: | bin.cheng <amker.cheng> |
| Component: | c++ | Assignee: | Jason Merrill <jason> |
| Status: | RESOLVED FIXED | ||
| Severity: | normal | CC: | jason, ramana |
| Priority: | P3 | Keywords: | wrong-code |
| Version: | 5.0 | ||
| Target Milestone: | --- | ||
| Host: | Target: | arm | |
| Build: | Known to work: | 4.8.3, 4.9.0, 4.9.1 | |
| Known to fail: | 5.0 | Last reconfirmed: | 2014-08-19 00:00:00 |
Confirmed. Also happened on thumb1/thumb2. |
Hi, The test case is like below. /* { dg-do compile { target arm*-*-* } } */ /* { dg-options "-mfp16-format=ieee" } */ /* Test mangling */ /* { dg-final { scan-assembler "\t.global\t_Z1fPDh" } } */ void f (__fp16 *x) { } /* { dg-final { scan-assembler "\t.global\t_Z1gPDhS_" } } */ void g (__fp16 *x, __fp16 *y) { } /* { dg-final { scan-assembler "\t.global\t_ZN1SIDhDhE1iE" } } */ template <typename T, typename U> struct S { static int i; }; template <> int S<__fp16, __fp16>::i = 3; But the generated assembly code is like. .weak _ZN1SIDhDhE1iE .section .data._ZN1SIDhDhE1iE,"awG",%progbits,_ZN1SIDhDhE1iE,comdat .align 2 .type _ZN1SIDhDhE1iE, %object .size _ZN1SIDhDhE1iE, 4 _ZN1SIDhDhE1iE: .word 3 .ident "GCC: (GNU) 4.10.0 20140811 (experimental)" In which _ZN1SIDhDhE1iE is weak, rather than global. This starts from r213307 and as stated by Jason at https://gcc.gnu.org/ml/gcc-patches/2014-08/msg01483.html. It is a bug? I know little about c++, so better leave it to an expert. Thanks very much.