[Buildroot] [PATCH 1/1] package/google-breakpad: fix build with glibc >= 2.33

[Arnout Vandecappelle]

On 26/09/2021 10:35, Fabrice Fontaine wrote:
> Fix the following build failure with glibc >= 2.33:
> 
> src/client/linux/handler/exception_handler.cc: In function 'void google_breakpad::{anonymous}::InstallAlternateStackLocked()':
> src/client/linux/handler/exception_handler.cc:147:49: error: no matching function for call to 'max(int, long int)'
>    147 |   static const unsigned kSigStackSize = std::max(16384, SIGSTKSZ);
>        |                                         ~~~~~~~~^~~~~~~~~~~~~~~~~
> 
> Fixes:
>   - http://autobuild.buildroot.org/results/61a89fa954db16a7b5b9fcee55c545e489f8d489
> 
> Signed-off-by: Fabrice Fontaine <fontaine.fabrice at gmail.com>

  Applied to master, thanks.

  Regards,
  Arnout

> ---
>   .../0004-Fix-for-non-constant-SIGSTKSZ.patch  | 34 +++++++++++++++++++
>   1 file changed, 34 insertions(+)
>   create mode 100644 package/google-breakpad/0004-Fix-for-non-constant-SIGSTKSZ.patch
> 
> diff --git a/package/google-breakpad/0004-Fix-for-non-constant-SIGSTKSZ.patch b/package/google-breakpad/0004-Fix-for-non-constant-SIGSTKSZ.patch
> new file mode 100644
> index 0000000000..4291216c61
> --- /dev/null
> +++ b/package/google-breakpad/0004-Fix-for-non-constant-SIGSTKSZ.patch
> @@ -0,0 +1,34 @@
> +From 4a332d01186b09a9d46390b845024d914d9149cb Mon Sep 17 00:00:00 2001
> +From: Michel Alexandre Salim <michel at michel-slm.name>
> +Date: Sun, 21 Mar 2021 13:17:00 -0700
> +Subject: [PATCH] Fix for non-constant SIGSTKSZ
> +
> +On glibc > 2.33, `SIGSTKSZ` might not be constant (in which case
> +it expands to a call to `sysconf` which returns a `long int`); see
> +http://sourceware-org.1504.n7.nabble.com/PATCH-sysconf-Add-SC-MINSIGSTKSZ-SC-SIGSTKSZ-BZ-20305-td650948.html
> +
> +Cast the two arguments to `max` to `unsigned`, which is the type of the variable
> +we're storing the result in anyway, so that it works both with the old-style constant
> +`SIGSTKSZ` and the new configurable one.
> +
> +Signed-off-by: Michel Alexandre Salim <michel at michel-slm.name>
> +Change-Id: I3d87048561a87c6b9fcdbb14b3d53dd45b0a00f0
> +
> +[Retrieved from:
> +https://chromium-review.googlesource.com/c/breakpad/breakpad/+/2776379]
> +Signed-off-by: Fabrice Fontaine <fontaine.fabrice at gmail.com>
> +---
> +
> +diff --git a/src/client/linux/handler/exception_handler.cc b/src/client/linux/handler/exception_handler.cc
> +index ca353c4..3788829 100644
> +--- a/src/client/linux/handler/exception_handler.cc
> ++++ b/src/client/linux/handler/exception_handler.cc
> +@@ -138,7 +138,7 @@
> +   // SIGSTKSZ may be too small to prevent the signal handlers from overrunning
> +   // the alternative stack. Ensure that the size of the alternative stack is
> +   // large enough.
> +-  static const unsigned kSigStackSize = std::max(16384, SIGSTKSZ);
> ++  static const unsigned kSigStackSize = std::max((unsigned) 16384, (unsigned) SIGSTKSZ);
> +
> +   // Only set an alternative stack if there isn't already one, or if the current
> +   // one is too small.
>