[setup - the official Cygwin setup program] branch master, updated. release_2.907

[Jon TURNEY]

https://sourceware.org/git/gitweb.cgi?p=cygwin-apps/setup.git;h=4cdf748a589cc7005648e7da65464dc1a8fb8f24

commit 4cdf748a589cc7005648e7da65464dc1a8fb8f24
Author: Jon Turney <jon.turney@dronecode.org.uk>
Date:   Sun Apr 11 16:52:05 2021 +0100

    Check compiler exception handling model during configure
    
    Since F32, Fedora ships a MinGW x86 compiler which uses DW2 exception
    handling [1].  This does not support throwing exceptions from Windows
    callbacks, which we use.
    
    [1] https://fedoraproject.org/wiki/Changes/Mingw32GccDwarf2


Diff:
---
 .github/workflows/fedora.yml |  2 +-
 configure.ac                 | 14 ++++++++++++++
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/fedora.yml b/.github/workflows/fedora.yml
index f732d296..e070d305 100644
--- a/.github/workflows/fedora.yml
+++ b/.github/workflows/fedora.yml
@@ -6,7 +6,7 @@ jobs:
   fedora-build:
     name: Fedora
     runs-on: ubuntu-latest
-    container: fedora:latest
+    container: fedora:31
     steps:
     # install git, so checkout uses git to fetch repository, so 'git describe' works
     - name: Install git
diff --git a/configure.ac b/configure.ac
index ab6f3ff6..6c06ba4d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -80,5 +80,19 @@ esac
 AC_SUBST(SETUP)
 AC_SUBST(ARCH)
 
+dnl check exception personality
+AC_MSG_CHECKING([compiler exception personality])
+AC_LANG([C++])
+AC_COMPILE_IFELSE(
+  [AC_LANG_SOURCE([
+#ifdef _X86_
+#ifndef __USING_SJLJ_EXCEPTIONS__
+#error not using sjlj exceptions
+#endif
+#endif
+  ])],
+  [AC_MSG_RESULT([ok])],
+  [AC_MSG_FAILURE([Must not be built with a compiler which uses dwarf2 exception handling])])
+
 AC_CONFIG_FILES([Makefile tests/Makefile])
 AC_OUTPUT