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followup for cid 1004EE408E1382C1752 and 1004EE40DDD498FBB0D:

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do a mirtoconf run-time check (ugh) to see whether the CPU designers
smoked/were brain-dead or if we don’t actually need the manual check
This commit is contained in:
tg
2011-12-31 02:04:18 +00:00
parent 25f413bf7d
commit 7ec1ae3771
3 changed files with 69 additions and 5 deletions
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64
Build.sh
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@@ -1,5 +1,5 @@
#!/bin/sh
srcversion='$MirOS: src/bin/mksh/Build.sh,v 1.500 2011/12/31 00:31:25 tg Exp $'
srcversion='$MirOS: src/bin/mksh/Build.sh,v 1.501 2011/12/31 02:04:16 tg Exp $'
#-
# Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
# Thorsten Glaser <tg@mirbsd.org>
@@ -147,7 +147,7 @@ ac_testinit() {
}
# pipe .c | ac_test[n] [!] label [!] checkif[!]0 [setlabelifcheckis[!]0] useroutput
ac_testn() {
ac_testnnd() {
if test x"$1" = x"!"; then
fr=1
shift
@@ -173,6 +173,9 @@ ac_testn() {
test $ct = sunpro && vscan='-e ignored -e turned.off'
fi
test -n "$vscan" && grep $vscan vv.out >/dev/null 2>&1 && fv=$fr
}
ac_testn() {
ac_testnnd "$@"
rmf conftest.c conftest.o ${tcfn}* vv.out
ac_testdone
}
@@ -1171,7 +1174,7 @@ else
#define EXTERN
#define MKSH_INCLUDES_ONLY
#include "sh.h"
__RCSID("$MirOS: src/bin/mksh/Build.sh,v 1.500 2011/12/31 00:31:25 tg Exp $");
__RCSID("$MirOS: src/bin/mksh/Build.sh,v 1.501 2011/12/31 02:04:16 tg Exp $");
int main(void) { printf("Hello, World!\n"); return (0); }
EOF
case $cm in
@@ -1535,6 +1538,61 @@ EOF
CFLAGS=$save_CFLAGS
eval test 1 = \$HAVE_COMPILE_TIME_ASSERTS_$$ || exit 1
#
# runtime checks
# once this is more than one, check if we can do runtime
# checks (not cross-compiling) first to save on warnings
#
$e "${bi}run-time checks follow$ao, please ignore any weird errors"
ac_testnnd silent_idivwrapv '' '(run-time) whether signed integer division overflows wrap silently' <<-'EOF'
#define MKSH_INCLUDES_ONLY
#include "sh.h"
#ifdef SIGFPE
static void fpe_catcher(int) MKSH_A_NORETURN;
#endif
int main(int ac, char **av) {
mksh_ari_t o1, o2, r1, r2;
#ifdef SIGFPE
signal(SIGFPE, fpe_catcher);
#endif
o1 = ((mksh_ari_t)1 << 31);
o2 = -ac;
r1 = o1 / o2;
r2 = o1 % o2;
if (r1 == o1 && r2 == 0) {
printf("si");
return (0);
}
printf("no %d %d %d %d %s", o1, o2, r1, r2, av[0]);
return (1);
}
#ifdef SIGFPE
static const char fpe_msg[] = "no, got SIGFPE, what were they smoking?";
static void fpe_catcher(int sig MKSH_A_UNUSED) {
write(1, fpe_msg, sizeof(fpe_msg) - 1);
_exit(2);
}
#endif
EOF
if test $fv = 0; then
echo "| hrm, compiling this failed, but we will just failback"
else
echo "| running test programme; this will fail if cross-compiling"
echo "| in which case we will gracefully degrade to the default"
./$tcfn >vv.out 2>&1
rv=$?
echo "| result: `cat vv.out`"
fv=0
test $rv = 0 && test x"`cat vv.out`" = x"si" && fv=1
fi
rmf conftest.c conftest.o ${tcfn}* vv.out
ac_testdone
ac_cppflags
$e "${bi}end of run-time checks$ao"
#
# Compiler: Praeprocessor (only if needed)
#