From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Ingo Molnar <mingo@kernel.org>, Thomas Gleixner <tglx@linutronix.de>
Cc: Jiri Olsa <jolsa@kernel.org>, Namhyung Kim <namhyung@kernel.org>,
Clark Williams <williams@redhat.com>,
linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
Vitaly Chikunov <vt@altlinux.org>,
Dmitry Levin <ldv@altlinux.org>,
Josh Poimboeuf <jpoimboe@redhat.com>,
kbuild test robot <lkp@intel.com>,
Peter Zijlstra <peterz@infradead.org>,
stable@vger.kernel.org, Vineet Gupta <vineet.gupta1@synopsys.com>,
Arnaldo Carvalho de Melo <acme@redhat.com>
Subject: [PATCH 20/20] tools lib: Fix builds when glibc contains strlcpy()
Date: Mon, 6 Jan 2020 13:07:05 -0300 [thread overview]
Message-ID: <20200106160705.10899-21-acme@kernel.org> (raw)
In-Reply-To: <20200106160705.10899-1-acme@kernel.org>
From: Vitaly Chikunov <vt@altlinux.org>
Disable a couple of compilation warnings (which are treated as errors)
on strlcpy() definition and declaration, allowing users to compile perf
and kernel (objtool) when:
1. glibc have strlcpy() (such as in ALT Linux since 2004) objtool and
perf build fails with this (in gcc):
In file included from exec-cmd.c:3:
tools/include/linux/string.h:20:15: error: redundant redeclaration of ‘strlcpy’ [-Werror=redundant-decls]
20 | extern size_t strlcpy(char *dest, const char *src, size_t size);
2. clang ignores `-Wredundant-decls', but produces another warning when
building perf:
CC util/string.o
../lib/string.c:99:8: error: attribute declaration must precede definition [-Werror,-Wignored-attributes]
size_t __weak strlcpy(char *dest, const char *src, size_t size)
../../tools/include/linux/compiler.h:66:34: note: expanded from macro '__weak'
# define __weak __attribute__((weak))
/usr/include/bits/string_fortified.h:151:8: note: previous definition is here
__NTH (strlcpy (char *__restrict __dest, const char *__restrict __src,
Committer notes:
The
#pragma GCC diagnostic
directive was introduced in gcc 4.6, so check for that as well.
Fixes: ce99091 ("perf tools: Move strlcpy() from perf to tools/lib/string.c")
Fixes: 0215d59 ("tools lib: Reinstate strlcpy() header guard with __UCLIBC__")
Resolves: https://bugzilla.kernel.org/show_bug.cgi?id=118481
Signed-off-by: Vitaly Chikunov <vt@altlinux.org>
Reviewed-by: Dmitry Levin <ldv@altlinux.org>
Cc: Dmitry Levin <ldv@altlinux.org>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: kbuild test robot <lkp@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: stable@vger.kernel.org
Cc: Vineet Gupta <vineet.gupta1@synopsys.com>
Link: http://lore.kernel.org/lkml/20191224172029.19690-1-vt@altlinux.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/include/linux/string.h | 8 ++++++++
tools/lib/string.c | 7 +++++++
2 files changed, 15 insertions(+)
diff --git a/tools/include/linux/string.h b/tools/include/linux/string.h
index 980cb9266718..5e9e781905ed 100644
--- a/tools/include/linux/string.h
+++ b/tools/include/linux/string.h
@@ -17,7 +17,15 @@ int strtobool(const char *s, bool *res);
* However uClibc headers also define __GLIBC__ hence the hack below
*/
#if defined(__GLIBC__) && !defined(__UCLIBC__)
+// pragma diagnostic was introduced in gcc 4.6
+#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wredundant-decls"
+#endif
extern size_t strlcpy(char *dest, const char *src, size_t size);
+#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)
+#pragma GCC diagnostic pop
+#endif
#endif
char *str_error_r(int errnum, char *buf, size_t buflen);
diff --git a/tools/lib/string.c b/tools/lib/string.c
index f2ae1b87c719..f645343815de 100644
--- a/tools/lib/string.c
+++ b/tools/lib/string.c
@@ -96,6 +96,10 @@ int strtobool(const char *s, bool *res)
* If libc has strlcpy() then that version will override this
* implementation:
*/
+#ifdef __clang__
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wignored-attributes"
+#endif
size_t __weak strlcpy(char *dest, const char *src, size_t size)
{
size_t ret = strlen(src);
@@ -107,6 +111,9 @@ size_t __weak strlcpy(char *dest, const char *src, size_t size)
}
return ret;
}
+#ifdef __clang__
+#pragma clang diagnostic pop
+#endif
/**
* skip_spaces - Removes leading whitespace from @str.
--
2.21.1
next prev parent reply other threads:[~2020-01-06 16:08 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-06 16:06 [GIT PULL] perf/core improvements and fixes Arnaldo Carvalho de Melo
2020-01-06 16:06 ` [PATCH 01/20] tools bitmap: Implement bitmap_equal() operation at bitmap API Arnaldo Carvalho de Melo
2020-01-06 16:06 ` [PATCH 02/20] perf mmap: Declare type for cpu mask of arbitrary length Arnaldo Carvalho de Melo
2020-01-06 16:06 ` [PATCH 03/20] perf record: Adapt affinity to machines with #CPUs > 1K Arnaldo Carvalho de Melo
2020-01-06 16:06 ` [PATCH 04/20] perf sched timehist: Add support for filtering on CPU Arnaldo Carvalho de Melo
2020-01-06 16:06 ` [PATCH 05/20] perf tests bp_signal: Show expected versus obtained values Arnaldo Carvalho de Melo
2020-01-06 16:06 ` [PATCH 06/20] libperf: Move to tools/lib/perf Arnaldo Carvalho de Melo
2020-01-06 16:06 ` [PATCH 07/20] libperf: Add man pages Arnaldo Carvalho de Melo
2020-01-06 16:06 ` [PATCH 08/20] tools lib api fs: Fix gcc9 stringop-truncation compilation error Arnaldo Carvalho de Melo
2020-01-07 9:16 ` Petr Mladek
2020-01-06 16:06 ` [PATCH 09/20] perf hists browser: Restore ESC as "Zoom out" of DSO/thread/etc Arnaldo Carvalho de Melo
2020-01-06 16:06 ` [PATCH 10/20] perf report/top: Make ENTER consistently bring up menu Arnaldo Carvalho de Melo
2020-01-06 16:06 ` [PATCH 11/20] perf report/top: Add menu entry for toggling callchain expansion Arnaldo Carvalho de Melo
2020-01-06 16:06 ` [PATCH 12/20] perf report/top: Improve toggle callchain menu option Arnaldo Carvalho de Melo
2020-01-06 16:06 ` [PATCH 13/20] perf hists browser: Generalize the do_zoom_dso() function Arnaldo Carvalho de Melo
2020-01-06 16:06 ` [PATCH 14/20] perf report/top: Add 'k' hotkey to zoom directly into the kernel map Arnaldo Carvalho de Melo
2020-01-06 16:07 ` [PATCH 15/20] perf hists browser: Allow passing an initial hotkey Arnaldo Carvalho de Melo
2020-01-06 16:07 ` [PATCH 16/20] tools ui popup: Allow returning hotkeys Arnaldo Carvalho de Melo
2020-01-06 16:07 ` [PATCH 17/20] perf report/top: Allow pressing hotkeys in the options popup menu Arnaldo Carvalho de Melo
2020-01-06 16:07 ` [PATCH 18/20] perf report/top: Do not offer annotation for symbols without samples Arnaldo Carvalho de Melo
2020-01-06 16:07 ` [PATCH 19/20] perf report/top: Make 'e' visible in the help and make it toggle showing callchains Arnaldo Carvalho de Melo
2020-01-06 16:07 ` Arnaldo Carvalho de Melo [this message]
2020-01-06 17:03 ` [PATCH 20/20] tools lib: Fix builds when glibc contains strlcpy() David Laight
2020-01-07 20:48 ` Vitaly Chikunov
2020-01-10 17:50 ` [GIT PULL] perf/core improvements and fixes Ingo Molnar
2020-01-28 19:10 ` pr-tracker-bot
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