[Bug tree-optimization/59479] New: Inlining of static function bloats code size when Os

[amker.cheng at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59479

            Bug ID: 59479
           Summary: Inlining of static function bloats code size when Os
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: amker.cheng at gmail dot com

Created attachment 31424
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31424&action=edit
The preprocessed file for newlib/libc/stdio/findfp.c

Hi, for attached preprocessed code from newlib/libc/stdio/findfp.c, GCC inlines
static function `std' even when optimizing for Os.
With command line:
$ ./arm-none-eabi-gcc -Os -mthumb -mcpu=cortex-m0 -c -xc findfp.E -o findfp.o

The dumped symbols are like:
    21: 00000009    16 FUNC    GLOBAL DEFAULT    1 _cleanup_r
    ...
    29: 00000055   224 FUNC    GLOBAL DEFAULT    1 __sinit
    ...
    41: 000001d5    24 FUNC    GLOBAL DEFAULT    1 __fp_unlock_all

With command line:
$ ./arm-none-eabi-gcc -Os -mthumb -mcpu=cortex-m0 -c -xc findfp.E -o findfp.o
-fno-inline

The dumped symbols are like:
     9: 00000018     0 NOTYPE  LOCAL  DEFAULT    1 $t
    10: 00000019    72 FUNC    LOCAL  DEFAULT    1 std.isra.0
    ...
    24: 00000009    16 FUNC    GLOBAL DEFAULT    1 _cleanup_r
    ...
    36: 0000009d    80 FUNC    GLOBAL DEFAULT    1 __sinit

This occurs on trunk and 4_8 branch.