[Buildroot] [PATCH v1] package/localedef: fix gcc-10.0.1 compile
Yann E. MORIN
yann.morin.1998 at free.fr
Sun Mar 29 14:23:36 UTC 2020
Peter, All,
On 2020-03-28 23:07 +0100, Peter Seiderer spake thusly:
> Fixes bug 12711 ([1]):
>
> programs/ld-ctype.c:855:18: error: array subscript 0 is outside the bounds of an interior zero-length array ‘unsigned char[0]’ [-Werror=zero-length-bounds]
> 855 | replace[0].bytes[0] = '?';
> | ~~~~~~~~~~~~~~~~^~~
>
> [1] https://bugs.busybox.net/show_bug.cgi?id=12711
>
> Signed-off-by: Peter Seiderer <ps.report at gmx.net>
Applied to master, thanks.
> ---
> Notes:
> Patch suggested by Yann E, MORIN, could not test personally (no
> gcc-10.0.1 available).
Neother do I, but the patch is exactly the one from upstream, which
claims to fix jsut this very issue, so seems legit to me, so I applied.
Thanks!
Regards,
Yann E. MORIN.
> ---
> ...itializer-for-flexible-array-member-.patch | 81 +++++++++++++++++++
> 1 file changed, 81 insertions(+)
> create mode 100644 package/localedef/2.30-20-g50f20fe506abb8853641006a7b90a81af21d7b91/0003-localedef-Use-initializer-for-flexible-array-member-.patch
>
> diff --git a/package/localedef/2.30-20-g50f20fe506abb8853641006a7b90a81af21d7b91/0003-localedef-Use-initializer-for-flexible-array-member-.patch b/package/localedef/2.30-20-g50f20fe506abb8853641006a7b90a81af21d7b91/0003-localedef-Use-initializer-for-flexible-array-member-.patch
> new file mode 100644
> index 0000000000..93547e08f0
> --- /dev/null
> +++ b/package/localedef/2.30-20-g50f20fe506abb8853641006a7b90a81af21d7b91/0003-localedef-Use-initializer-for-flexible-array-member-.patch
> @@ -0,0 +1,81 @@
> +From 6fea0a8e33760258c4baa5d0a6f3a145897427fe Mon Sep 17 00:00:00 2001
> +From: Florian Weimer <fweimer at redhat.com>
> +Date: Tue, 3 Sep 2019 14:01:39 +0200
> +Subject: [PATCH] localedef: Use initializer for flexible array member [BZ
> + #24950]
> +
> +struct charseq used a zero-length array instead of a flexible array
> +member. This required a strange construct to initialize struct
> +charseq objects, and GCC 10 warns about that:
> +
> +cc1: error: writing 1 byte into a region of size 0 [-Werror=stringop-overflow=]
> +In file included from programs/repertoire.h:24,
> + from programs/localedef.h:32,
> + from programs/ld-ctype.c:35:
> +programs/charmap.h:63:17: note: destination object declared here
> + 63 | unsigned char bytes[0];
> + | ^~~~~
> +cc1: error: writing 1 byte into a region of size 0 [-Werror=stringop-overflow=]
> +programs/charmap.h:63:17: note: destination object declared here
> +cc1: error: writing 1 byte into a region of size 0 [-Werror=stringop-overflow=]
> +programs/charmap.h:63:17: note: destination object declared here
> +cc1: error: writing 1 byte into a region of size 0 [-Werror=stringop-overflow=]
> +programs/charmap.h:63:17: note: destination object declared here
> +
> +The change makes the object physically const, but it is not expected
> +to be modified.
> +
> +[Upstream: https://sourceware.org/git/?p=glibc.git;a=patch;h=1471fa556afb428c4a4c46cf5543a4101d5bcf91]
> +[Dropped confliciting ChangeLog part]
> +Signed-off-by: Peter Seiderer <ps.report at gmx.net>
> +---
> + locale/programs/charmap.h | 2 +-
> + locale/programs/ld-ctype.c | 12 ++++++------
> + 2 files changed, 7 insertions(+), 7 deletions(-)
> +
> +diff --git a/locale/programs/charmap.h b/locale/programs/charmap.h
> +index 870a9e95..70db330d 100644
> +--- a/locale/programs/charmap.h
> ++++ b/locale/programs/charmap.h
> +@@ -60,7 +60,7 @@ struct charseq
> + const char *name;
> + uint32_t ucs4;
> + int nbytes;
> +- unsigned char bytes[0];
> ++ unsigned char bytes[];
> + };
> +
> +
> +diff --git a/locale/programs/ld-ctype.c b/locale/programs/ld-ctype.c
> +index cfc9c43f..9123f64a 100644
> +--- a/locale/programs/ld-ctype.c
> ++++ b/locale/programs/ld-ctype.c
> +@@ -842,8 +842,6 @@ no input digits defined and none of the standard names in the charmap"));
> + for (cnt = 0; cnt < 10; ++cnt)
> + if (ctype->mboutdigits[cnt] == NULL)
> + {
> +- static struct charseq replace[2];
> +-
> + if (!warned)
> + {
> + record_error (0, 0, _("\
> +@@ -851,10 +849,12 @@ not all characters used in `outdigit' are available in the charmap"));
> + warned = 1;
> + }
> +
> +- replace[0].nbytes = 1;
> +- replace[0].bytes[0] = '?';
> +- replace[0].bytes[1] = '\0';
> +- ctype->mboutdigits[cnt] = &replace[0];
> ++ static const struct charseq replace =
> ++ {
> ++ .nbytes = 1,
> ++ .bytes = "?",
> ++ };
> ++ ctype->mboutdigits[cnt] = (struct charseq *) &replace;
> + }
> +
> + warned = 0;
> +--
> +2.26.0
> +
> --
> 2.26.0
>
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