This is my script for narrowing down miscompilations to a single file.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10890 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/utils/check-each-file b/utils/check-each-file
new file mode 100755 (executable)
index 0000000..667698d
--- /dev/null
+++ b/utils/check-each-file
@@ -0,0 +1,147 @@
+#!/bin/sh
+# check-each-file
+# Used to narrow down a miscompilation to one .o file from a list. Please read
+# the usage procedure, below, for command-line syntax (or run it with --help).
+# This script depends on the llvm-native-gcc script.
+
+if [ x$1 = x--make-linker-script ]
+then
+       program=$2
+       linker=./link-$program
+       echo "Building $program with llvm-native-gcc"
+       rm -f $program
+       gmake -s $program CC=llvm-native-gcc
+       echo "Erasing $program and re-linking it" 
+       rm -f $program
+       echo "rm -f $program" > $linker
+       gmake -n $program >> $linker
+       chmod 755 $linker
+       echo "Linker script created in $linker; testing it out"
+       output=`./$linker 2>&1`
+       case "$output" in
+               *undefined*reference*__main*) 
+                       echo "$program appears to need a dummy __main function; adding one"
+                       echo "void __main () { }" > __main.c
+                       gcc -c __main.c
+                       echo "Done; rebuilding $linker"
+                       echo "rm -f $program" > $linker
+                       gmake -n $program 2>&1 | sed '/gcc/s/$/__main.o/' >> $linker
+                       ./$linker > /dev/null 2>&1
+                       if [ ! -x $program ]
+                       then
+                               echo "WARNING: linker script didn't work"
+                       fi
+                       ;;
+               *)
+                       if [ ! -x $program ]
+                       then
+                               echo "WARNING: linker script didn't work"
+                       fi
+                       ;;
+       esac
+       echo "Linker script created in $linker; please check it manually"
+       exit 0
+fi
+
+checkfiles="$1"
+program="$2"
+linker="$3"
+checker="$4"
+
+usage () {
+       myname=`basename $0`
+       echo "$myname --make-linker-script PROGRAM"
+       echo "$myname OBJECTS-FILE PROGRAM LINKER CHECKER"
+       echo ""
+       echo "OBJECTS-FILE is a text file containing the names of all the .o files"
+       echo "PROGRAM is the name of the executable under test"
+       echo "(there must also exist a Makefile in the current directory which
+       echo "has PROGRAM as a target)"
+       echo "LINKER is the script that builds PROGRAM; try --make-linker-script" 
+       echo "to automatically generate it"
+       echo "CHECKER is the script that exits 0 if PROGRAM is ok, 1 if it is not OK"
+       echo "(LINKER and CHECKER must be in your PATH, or you should specify ./)"
+       echo ""
+       echo "Bugs to <gaeke@uiuc.edu>."
+       exit 1
+}
+
+if [ x$1 = x--help ]
+then
+       usage
+fi
+
+if [ -z "$checkfiles" ]
+then
+       echo "ERROR: Must specify name of file w/ list of objects as 1st arg."
+       echo "(got \"$checkfiles\")"
+       usage
+fi
+if [ ! -f "$checkfiles" ]
+then
+       echo "ERROR: $checkfiles not found"
+       usage
+fi
+if [ -z "$program" ]
+then
+       echo "ERROR: Must specify name of program as 2nd arg."
+       usage
+fi
+if [ -z "$linker" ]
+then
+       echo "ERROR: Must specify name of link script as 3rd arg."
+       usage
+fi
+if [ ! -x "$linker" ]
+then
+       echo "ERROR: $linker not found or not executable"
+       echo "You may wish to try: $0 --make-linker-script $program"
+       usage
+fi
+if [ -z "$checker" ]
+then
+       echo "ERROR: Must specify name of $program check script as 3rd arg."
+       usage
+fi
+if [ ! -x "$checker" ]
+then
+       echo "ERROR: $checker not found or not executable"
+       usage
+fi
+
+files=`cat $checkfiles`
+echo "Recompiling everything with llvm-native-gcc"
+for f in $files
+do
+       rm -f $f && gmake $f CC=llvm-native-gcc
+done
+if $checker
+then
+       echo "Sorry, I can't help you, $program is OK when compiled with llvm-native-gcc"
+       exit 1
+fi
+for f in $files
+do
+       echo Trying to compile $f with native gcc and rebuild $program
+       mv ${f} ${f}__OLD__
+       gmake ${f} CC=gcc > /dev/null 2>&1
+       $linker
+       echo Checking validity of new $program
+       if $checker
+       then
+               echo Program is OK
+               okfiles="$okfiles $f"
+       else
+               echo Program is not OK
+               notokfiles="$notokfiles $f"
+       fi
+       mv ${f}__OLD__ ${f}
+done
+echo ""
+echo "Program is OK when these files are recompiled with native gcc: "
+echo "$okfiles"
+echo ""
+echo "Program is not OK when these files are recompiled with native gcc: "
+echo "$notokfiles"
+echo ""
+exit 0