[Buildroot] [PATCH 1/2] package/libtpms: fix build with host gcc >= 15.x

[Thomas Perale]

In reply of:
> Fixes:
> https://autobuild.buildroot.net/results/7a6/7a6ea7c513e8f1dcc32d868108bfb2a907d6fe85/
> 
> The previous change to src/tpm_library.c dates back to 2024:
> https://github.com/stefanberger/libtpms/commits/master/src/tpm_library.c
> so a backport to buildroot LTS branches should be considered.
> 
> Signed-off-by: Bernd Kuhls <bernd at kuhls.net>

Applied to 2025.02.x, 2025.11.x & 2026.02.x. Thanks

> ---
>  ...ilation-error-in-TPMLIB_GetPlaintext.patch | 40 +++++++++++++++++++
>  1 file changed, 40 insertions(+)
>  create mode 100644 package/libtpms/0001-Fix-a-compilation-error-in-TPMLIB_GetPlaintext.patch
> 
> diff --git a/package/libtpms/0001-Fix-a-compilation-error-in-TPMLIB_GetPlaintext.patch b/package/libtpms/0001-Fix-a-compilation-error-in-TPMLIB_GetPlaintext.patch
> new file mode 100644
> index 0000000000..02c4df9668
> --- /dev/null
> +++ b/package/libtpms/0001-Fix-a-compilation-error-in-TPMLIB_GetPlaintext.patch
> @@ -0,0 +1,40 @@
> +From fc8820cfaa8b5e17328f731df93911f6ab92443b Mon Sep 17 00:00:00 2001
> +From: Stefan Berger <stefanb at linux.ibm.com>
> +Date: Fri, 2 Jan 2026 11:37:31 -0500
> +Subject: [PATCH] Fix a compilation error in TPMLIB_GetPlaintext
> +
> +Fix a compilation error that newer gcc versions may complain about:
> +
> +tpm_library.c: In function 'TPMLIB_GetPlaintext':
> +tpm_library.c:441:11: error: assignment discards 'const' qualifier from pointer target type [-Werror=discarded-qualifiers]
> +  441 |     start = strstr(stream, starttag);
> +      |           ^
> +At top level:
> +cc1: note: unrecognized command-line option '-Wno-self-assign' may have been intended to silence earlier diagnostics
> +cc1: all warnings being treated as errors
> +
> +Signed-off-by: Stefan Berger <stefanb at linux.ibm.com>
> +
> +Upstream: https://github.com/stefanberger/libtpms/commit/fc8820cfaa8b5e17328f731df93911f6ab92443b
> +
> +Signed-off-by: Bernd Kuhls <bernd at kuhls.net>
> +---
> + src/tpm_library.c | 2 +-
> + 1 file changed, 1 insertion(+), 1 deletion(-)
> +
> +diff --git a/src/tpm_library.c b/src/tpm_library.c
> +index f48f4fd3..7b2ea687 100644
> +--- a/src/tpm_library.c
> ++++ b/src/tpm_library.c
> +@@ -435,7 +435,7 @@ static unsigned char *TPMLIB_GetPlaintext(const char *stream,
> +                                           const char *endtag,
> +                                           size_t *length)
> + {
> +-    char *start, *end;
> ++    const char *start, *end;
> +     unsigned char *plaintext = NULL;
> + 
> +     start = strstr(stream, starttag);
> +-- 
> +2.47.3
> +
> -- 
> 2.47.3
> 
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