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authorZack Weinberg <zackw@panix.com>2016-11-21 08:16:27 -0500
committerZack Weinberg <zackw@panix.com>2017-02-25 09:47:51 -0500
commit7caa5054afc1754a871333b1539e08a4af79444e (patch)
treea88f80370a89a6a7a2b2e26d3e3f0f51131fef32 /stdio-common
parent4f5a9afffb7f1fdb330b0f8dcca196a439ac07a8 (diff)
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Clean up conditionals for declaration of gets.
gets has the dubious honor of being the only C89 library feature that has been completely removed from the current C and C++ standards. glibc follows suit by not declaring it in _GNU_SOURCE mode either, but it remains present in older compatibility modes. Internally, two test cases need to see stdio.h make the declaration, but all our internal code is of course compiled under _GNU_SOURCE. This is currently kludged by duplicating the gets declaration, fortify wrapper and all, in include/stdio.h. Also, the conditional in the public headers for deciding when to declare gets is complicated and repeated in two places. This patch adds a new macro to features.h that encapsulates the complicated rule for when to declare gets. stdio.h and bits/stdio2.h then simply test __GLIBC_USE (DEPRECATED_GETS), and instead of having a duplicate gets declaration in include/stdio.h, debug/tst-chk1.c and stdio-common/tst-gets.c can force gets to be declared. * include/features.h (__GLIBC_USE_DEPRECATED_GETS): New macro. * libio/stdio.h, libio/bits/stdio2.h: Condition gets on __GLIBC_USE (DEPRECATED_GETS). Update comments to indicate gets was removed from C++ in C++14. * include/stdio.h: Remove redundant declaration of gets. * debug/tst-chk1.c, stdio-common/tst-gets.c: Force gets to be declared, since we are testing it. * stdio-common/Makefile (tst-gets.c): Compile with -Wno-deprecated-declarations. * debug/Makefile (tst-chk1.c, tst-chk2.c, tst-chk3.c, tst-chk4.cc) (tst-chk5.cc, tst-chk6.cc, tst-lfschk1.c, tst-lfschk2.c) (tst-lfschk3.c, tst-lfschk4.cc, tst-lfschk5.cc, tst-lfschk6.cc): Compile with -Wno-deprecated-declarations.
Diffstat (limited to 'stdio-common')
-rw-r--r--stdio-common/Makefile3
-rw-r--r--stdio-common/tst-gets.c5
2 files changed, 8 insertions, 0 deletions
diff --git a/stdio-common/Makefile b/stdio-common/Makefile
index f693fa0..01a6dd0 100644
--- a/stdio-common/Makefile
+++ b/stdio-common/Makefile
@@ -141,6 +141,9 @@ CFLAGS-scanf15.c = -I../libio -I../stdlib -I../wcsmbs -I../time -I../string \
CFLAGS-scanf17.c = -I../libio -I../stdlib -I../wcsmbs -I../time -I../string \
-I../wctype
+# tst-gets.c tests a deprecated function.
+CFLAGS-tst-gets.c += -Wno-deprecated-declarations
+
CPPFLAGS += $(libio-mtsafe)
$(objpfx)tst-setvbuf1.out: /dev/null $(objpfx)tst-setvbuf1
diff --git a/stdio-common/tst-gets.c b/stdio-common/tst-gets.c
index 102f235..9340c76 100644
--- a/stdio-common/tst-gets.c
+++ b/stdio-common/tst-gets.c
@@ -17,6 +17,11 @@
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
+/* This file tests gets. Force it to be declared. */
+#include <features.h>
+#undef __GLIBC_USE_DEPRECATED_GETS
+#define __GLIBC_USE_DEPRECATED_GETS 1
+
#include <stdio.h>
#include <string.h>