diff options
Diffstat (limited to 'contrib/binutils/bfd/cache.c')
-rw-r--r-- | contrib/binutils/bfd/cache.c | 23 |
1 files changed, 19 insertions, 4 deletions
diff --git a/contrib/binutils/bfd/cache.c b/contrib/binutils/bfd/cache.c index b28de4b..ad3140e 100644 --- a/contrib/binutils/bfd/cache.c +++ b/contrib/binutils/bfd/cache.c @@ -285,10 +285,25 @@ bfd_open_file (abfd) } else { - /* Create the file. Unlink it first, for the convenience of - operating systems which worry about overwriting running - binaries. */ - unlink (abfd->filename); + /* Create the file. + + Some operating systems won't let us overwrite a running + binary. For them, we want to unlink the file first. + + However, gcc 2.95 will create temporary files using + O_EXCL and tight permissions to prevent other users from + substituting other .o files during the compilation. gcc + will then tell the assembler to use the newly created + file as an output file. If we unlink the file here, we + open a brief window when another user could still + substitute a file. + + So we unlink the output file if and only if it has + non-zero size. */ + struct stat s; + + if (stat (abfd->filename, &s) == 0 && s.st_size != 0) + unlink (abfd->filename); abfd->iostream = (PTR) fopen (abfd->filename, FOPEN_WB); abfd->opened_once = true; } |