From d66a30794183e04f121fd1464d7bfcfbbcaf64ed Mon Sep 17 00:00:00 2001
From: Mark Adler <madler@alumni.caltech.edu>
Date: Sun, 9 Oct 2011 10:16:43 -0700
Subject: [PATCH] Add --cover option to ./configure for gcc coverage testing.

This adds the -fprofile-arcs and -ftest-coverage options when compiling
the source code for the static library.  Those same options must then be
used when linking the static library into an executable.  This updates
Makefile.in to remove and .gitignore to ignore the files generated when
testing coverage.
---
 .gitignore  | 4 ++++
 Makefile.in | 1 +
 configure   | 8 +++++++-
 3 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/.gitignore b/.gitignore
index 81d3ed29..8c6bce0b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,6 +9,10 @@
 *.o
 *.dylib
 
+*.gcda
+*.gcno
+*.gcov
+
 /example
 /example64
 /examplesh
diff --git a/Makefile.in b/Makefile.in
index 1b8bf3f8..9ac04060 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -232,6 +232,7 @@ clean:
 	   libz.* foo.gz so_locations \
 	   _match.s maketree contrib/infback9/*.o
 	rm -rf objs
+	rm -f *.gcda *.gcno *.gcov
 
 maintainer-clean: distclean
 distclean: clean zconf zconf.h.cmakein docs
diff --git a/configure b/configure
index 672b24fe..d15c03b6 100755
--- a/configure
+++ b/configure
@@ -55,6 +55,7 @@ mandir=${mandir-'${prefix}/share/man'}
 shared_ext='.so'
 shared=1
 solo=0
+cover=0
 zprefix=0
 build64=0
 gcc=0
@@ -85,6 +86,7 @@ case "$1" in
     -s* | --shared | --enable-shared) shared=1; shift ;;
     -t | --static) shared=0; shift ;;
     --solo) solo=1; shift ;;
+    --cover) cover=1; shift ;;
     -z* | --zprefix) zprefix=1; shift ;;
     -6* | --64) build64=1; shift ;;
     -a*=* | --archs=*) ARCHS=`echo $1 | sed 's/.*=//'`; shift ;;
@@ -345,6 +347,10 @@ OBJC='$(OBJZ)'
 PIC_OBJC='$(PIC_OBJZ)'
 fi
 
+if test $cover -eq 1; then
+  CFLAGS="${CFLAGS} -fprofile-arcs -ftest-coverage"
+fi
+
 cat > $test.c <<EOF
 #include <stdio.h>
 #include <stdarg.h>
@@ -578,7 +584,7 @@ case $CFLAGS in
     fi ;;
 esac
 
-rm -f $test.[co] $test $test$shared_ext
+rm -f $test.[co] $test $test$shared_ext $test.gcno
 
 # udpate Makefile
 sed < Makefile.in "