packages/cysignals: Add sagemath/cysignals#197 as a patch

Author: mkoeppe

packages/cysignals/meta.yaml

@@ -8,6 +8,7 @@ source:
   sha256: 0f1e321e55a07f901c86a36a1e4497f6ff9dfe700681d0130a38c36e4eb238c3
   patches:
     - patches/193.patch
+    - patches/0001-src-cysignals-implementation.c-EMSCRIPTEN-Do-not-use.patch
 about:
   home: https://github.com/sagemath/cysignals
   PyPI: https://pypi.org/project/cysignals

packages/cysignals/patches/0001-src-cysignals-implementation.c-EMSCRIPTEN-Do-not-use.patch

@@ -0,0 +1,36 @@
+From b13d2be64ff7f855465002cd507cb830de0d43da Mon Sep 17 00:00:00 2001
+From: Matthias Koeppe <[email protected]>
+Date: Wed, 24 Jan 2024 23:24:45 -0800
+Subject: [PATCH] src/cysignals/implementation.c [EMSCRIPTEN]: Do not use
+ sigaltstack
+
+---
+ src/cysignals/implementation.c | 4 +++-
+ 1 file changed, 3 insertions(+), 1 deletion(-)
+
+diff --git a/src/cysignals/implementation.c b/src/cysignals/implementation.c
+index 2afd6ad..3088cdf 100644
+--- a/src/cysignals/implementation.c
++++ b/src/cysignals/implementation.c
+@@ -531,7 +531,7 @@ static void _sig_off_warning(const char* file, int line)
+ 
+ static void setup_alt_stack(void)
+ {
+-#if HAVE_SIGALTSTACK
++#if HAVE_SIGALTSTACK && !defined(__EMSCRIPTEN__)
+     /* Space for the alternate signal stack. The size should be
+      * of the form MINSIGSTKSZ + constant. The constant is chosen rather
+      * ad hoc but sufficiently large.
+@@ -576,7 +576,9 @@ static void setup_cysignals_handlers(void)
+      * After setting up the trampoline, we reset the signal mask. */
+     sigprocmask(SIG_BLOCK, &sa.sa_mask, &default_sigmask);
+ #endif
++#if !defined(__EMSCRIPTEN__)
+     setup_trampoline();
++#endif
+ #if HAVE_SIGPROCMASK
+     sigprocmask(SIG_SETMASK, &default_sigmask, &sigmask_with_sigint);
+ #endif
+-- 
+2.42.0
+