Port configure script to C99

Related to:

  <https://fedoraproject.org/wiki/Changes/PortingToModernC>
  <https://fedoraproject.org/wiki/Toolchain/PortingToModernC>

gsl-configure-c99.patch

@@ -0,0 +1,49 @@
+Avoid calling the undeclared exit function and future failures
+with compilers which do not support implicit function declarations.
+
+Submitted upstream: <https://savannah.gnu.org/bugs/index.php?63679>
+
+diff --git a/configure b/configure
+index b593652a6693e702..dac25375fd493823 100755
+--- a/configure
++++ b/configure
+@@ -14407,7 +14407,7 @@ int main (void)
+    inf = exp(1.0e10);
+    nan = inf / inf ;
+    status = (nan == nan);
+-   exit (status);
++   return status;
+ }
+ _ACEOF
+ if ac_fn_c_try_run "$LINENO"
+@@ -14452,7 +14452,7 @@ int main (void)
+    for (i = 0; i < 5; i++) { z = z / 10.0 ; };
+    for (i = 0; i < 5; i++) { z = z * 10.0 ; };
+    status = (z == 0.0);
+-   exit (status);
++   return status;
+ }
+ _ACEOF
+ if ac_fn_c_try_run "$LINENO"
+diff --git a/configure.ac b/configure.ac
+index a2e038f5656e983a..40e7d2a3db3e4d41 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -449,7 +449,7 @@ int main (void)
+    inf = exp(1.0e10);
+    nan = inf / inf ;
+    status = (nan == nan);
+-   exit (status);
++   return status;
+ }]])],[ac_cv_c_ieee_comparisons="yes"],[ac_cv_c_ieee_comparisons="no"],[ac_cv_c_ieee_comparisons="yes"])
+ ])
+ 
+@@ -469,7 +469,7 @@ int main (void)
+    for (i = 0; i < 5; i++) { z = z / 10.0 ; };        
+    for (i = 0; i < 5; i++) { z = z * 10.0 ; };
+    status = (z == 0.0);
+-   exit (status);
++   return status;
+ }]])],[ac_cv_c_ieee_denormals="yes"],[ac_cv_c_ieee_denormals="no"],[ac_cv_c_ieee_denormals="yes"])
+ ])
+ 

gsl.spec

@@ -1,7 +1,7 @@
 Summary: The GNU Scientific Library for numerical analysis
 Name: gsl
 Version: 2.7.1
-Release: 2%{?dist}
+Release: 3%{?dist}
 URL: http://www.gnu.org/software/gsl/
 License: GPLv3+
 Source: http://ftp.gnu.org/gnu/gsl/%{name}-%{version}.tar.gz
@@ -9,6 +9,7 @@ Patch0: gsl-1.10-lib64.patch
 # http://lists.gnu.org/archive/html/bug-gsl/2015-12/msg00012.html
 Patch1: gsl-tol.patch
 Patch2: gsl-test.patch
+Patch3: gsl-configure-c99.patch
 
 BuildRequires: gcc
 BuildRequires: pkgconfig
@@ -33,6 +34,7 @@ developing programs using the GSL (GNU Scientific Library).
 %patch0 -p1 -b .lib64
 %patch1 -p1 -b .tol
 %patch2 -p1 -b .test
+%patch3 -p1
 
 iconv -f windows-1252 -t utf-8 THANKS  > THANKS.aux
 touch -r THANKS THANKS.aux
@@ -81,6 +83,9 @@ rm -r %{buildroot}%{_libdir}/*.a
 %{_includedir}/gsl/
 
 %changelog
+* Wed Jan 18 2023 Florian Weimer <fweimer@redhat.com> - 2.7.1-3
+- Port configure script to C99
+
 * Tue Aug 23 2022 Mamoru TASAKA <mtasaka@fedoraproject.org> - 2.7.1-2
 - Rebuild again for bodhi issue