commit: 62136f3e756cd1fbbb6c5c840f228417a215994f
parent: 88637baea2845406e90d0e990bc4319aace602f6
author: Brian Callahan <bcallah@openbsd.org>
date: Sun, 19 Jun 2022 00:40:08 -0400
Add a configure check for _Noreturn
Useful for cproc and other C11 compilers that don't support GNU
__attribute__ extensions.
1 file changed, 30 insertions(+), 2 deletions(-)
diff --git a/configure b/configure
@@ -126,6 +126,22 @@ EOF
fi
}
+c11noreturncheck() {
+ cat << EOF > conftest.c
+#include <stdlib.h>
+_Noreturn int usage(void){exit(1);}int main(void){usage();return 0;}
+EOF
+ $cc $cflags -o conftest.o -c conftest.c > /dev/null 2>&1
+ $cc $ldflags -o conftest conftest.o > /dev/null 2>&1
+ if [ $? -eq 0 ] ; then
+ rm -f conftest conftest.o conftest.c
+ return 0
+ else
+ rm -f conftest conftest.o conftest.c
+ return 1
+ fi
+}
+
c99check() {
cat << EOF > conftest.c
#include <stdio.h>
@@ -1109,9 +1125,21 @@ else
echo "#define __dead __attribute__((__noreturn__))" >> pconfig.h
echo "yes"
else
- echo "#define __dead" >> pconfig.h
- echo "#define __attribute__(x)" >> pconfig.h
echo "no"
+ printf "checking for _Noreturn... "
+ c11noreturncheck
+ if [ $? -eq 0 ] ; then
+ echo "#ifdef __dead" >> pconfig.h
+ echo "#undef __dead" >> pconfig.h
+ echo "#endif" >> pconfig.h
+ echo "#define __dead _Noreturn" >> pconfig.h
+ echo "#define __attribute__(x)" >> pconfig.h
+ echo "yes"
+ else
+ echo "#define __dead" >> pconfig.h
+ echo "#define __attribute__(x)" >> pconfig.h
+ echo "no"
+ fi
fi
fi
fi
