aboutsummaryrefslogtreecommitdiff
path: root/include
diff options
context:
space:
mode:
authorJoseph Myers <joseph@codesourcery.com>2018-02-15 20:58:16 +0000
committerJoseph Myers <joseph@codesourcery.com>2018-02-15 20:58:16 +0000
commit499b315324519f8deb5b42a143a76319934a3ab0 (patch)
tree4923f289669b62c9093e6820341706235f96cafe /include
parent7fc03cf320f9ed0178babbb33de0550d393b8886 (diff)
downloadglibc-499b315324519f8deb5b42a143a76319934a3ab0.zip
glibc-499b315324519f8deb5b42a143a76319934a3ab0.tar.gz
glibc-499b315324519f8deb5b42a143a76319934a3ab0.tar.bz2
Use libc_hidden_* for fputs (bug 15105).
Among other localplt test failures when building with -Os, there are libc.so PLT references for fputs. fputs calls normally get redirected to _IO_fputs by a macro in include/stdio.h (and _IO_fputs in turn uses libc_hidden_proto), but GCC can convert an fprintf call with a constant string argument into an fputs call, which of course is then unaffected by the macro redirection. (I don't know why this issue only appears with -Os.) This patch duly adds a use of libc_hidden_proto for fputs. I see no obvious reason why the fputs macro redirection is needed at all, but this patch does not change it. Tested for x86_64 (both that it removes this particular localplt failure for -Os - but other such failures remain so the bug can't yet be closed - and that the testsuite continues to pass without -Os). [BZ #15105] * include/stdio.h [!_ISOMAC && IS_IN (libc)] (fputs): Use libc_hidden_proto. * libio/iofputs.c (fputs): Use libc_hidden_weak.
Diffstat (limited to 'include')
-rw-r--r--include/stdio.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/stdio.h b/include/stdio.h
index 7ab3ddd..7871000 100644
--- a/include/stdio.h
+++ b/include/stdio.h
@@ -140,6 +140,10 @@ extern int _IO_new_fclose (_IO_FILE*);
# define fclose(fp) _IO_new_fclose (fp)
extern int _IO_fputs (const char*, _IO_FILE*);
libc_hidden_proto (_IO_fputs)
+/* The compiler may optimize calls to fprintf into calls to fputs.
+ Use libc_hidden_proto to ensure that those calls, not redirected by
+ the fputs macro, also do not go through the PLT. */
+libc_hidden_proto (fputs)
# define fputs(str, fp) _IO_fputs (str, fp)
extern int _IO_new_fsetpos (_IO_FILE *, const _IO_fpos_t *);
# define fsetpos(fp, posp) _IO_new_fsetpos (fp, posp)