From: ellson <devnull@localhost>
Date: Fri, 16 Dec 2005 22:17:23 +0000 (+0000)
Subject: make FP error trapping conditional on not using -ffast-math
X-Git-Tag: LAST_LIBGRAPH~32^2~6921
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=45f343b8903a6fa209b1bf5fdbce7767cfb84ad8;p=graphviz

make FP error trapping conditional on not using -ffast-math
---

diff --git a/cmd/dot/dot.c b/cmd/dot/dot.c
index 6ba014a9b..7a473952a 100644
--- a/cmd/dot/dot.c
+++ b/cmd/dot/dot.c
@@ -104,7 +104,6 @@ static void fpinit(void)
     _FPU_SETCW(fpe_flags);
 # endif
 #endif
-    signal(SIGFPE, fperr);
 }
 #endif
 
@@ -145,7 +144,10 @@ int main(int argc, char **argv)
 #ifndef MSWIN32
     signal(SIGUSR1, gvToggle);
     signal(SIGINT, intr);
+#ifndef NO_FPERR
     fpinit();
+    signal(SIGFPE, fperr);
+#endif
 #endif
 
     if (MemTest) {
diff --git a/configure.ac b/configure.ac
index 342d48193..58c87613f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -193,6 +193,11 @@ else
 	    ;;
     esac
 fi
+# -ffast-math is incompatible with FP error trapping
+#     ref: https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=175793
+if `echo ${CFLAGS} | grep -q ffast-math`; then
+    CFLAGS="${CFLAGS} -DNO_FPERR"
+fi
 
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