1 files changed, 47 insertions, 0 deletions
diff --git a/m4/gcov.m4 b/m4/gcov.m4
new file mode 100644
index 00000000..c96eddac
--- /dev/null
+++ b/m4/gcov.m4
@@ -0,0 +1,47 @@
+AC_DEFUN([GI_ENABLE_GCOV],
+[
+  AC_ARG_ENABLE(gcov,
+    AC_HELP_STRING([--enable-gcov],
+      [compile with coverage profiling instrumentation (gcc only)]),
+    enable_gcov=$enableval,
+    enable_gcov=no)
+  if test x$enable_gcov = xyes ; then
+    if test "x$GCC" != "xyes"
+    then
+      AC_MSG_ERROR([gcov only works if gcc is used])
+    fi
+
+    AS_COMPILER_FLAG(["-fprofile-arcs"],
+      [GCOV_CFLAGS="$GCOV_CFLAGS -fprofile-arcs"],
+      true)
+    AS_COMPILER_FLAG(["-ftest-coverage"],
+      [GCOV_CFLAGS="$GCOV_CFLAGS -ftest-coverage"],
+      true)
+    dnl libtool 1.5.22 and lower strip -fprofile-arcs from the flags
+    dnl passed to the linker, which is a bug; -fprofile-arcs implicitly
+    dnl links in -lgcov, so we do it explicitly here for the same effect
+    GCOV_LIBS=-lgcov
+    AC_SUBST(GCOV_CFLAGS)
+    AC_SUBST(GCOV_LIBS)
+    GCOV=`echo $CC | sed s/gcc/gcov/g`
+    AC_SUBST(GCOV)
+
+    GI_GCOV_ENABLED=yes
+    AC_DEFINE_UNQUOTED(GI_GCOV_ENABLED, 1,
+      [Defined if gcov is enabled to force a rebuild due to config.h changing])
+    dnl if gcov is used, we do not want default -O2 CFLAGS
+    if test "x$GI_GCOV_ENABLED" = "xyes"
+    then
+      CFLAGS="-g -O0"
+      AC_SUBST(CFLAGS)
+      CXXFLAGS="-g -O0"
+      AC_SUBST(CXXFLAGS)
+      FFLAGS="-g -O0"
+      AC_SUBST(FFLAGS)
+      CCASFLAGS="-g -O0"
+      AC_SUBST(CCASFLAGS)
+      AC_MSG_NOTICE([gcov enabled, setting CFLAGS and friends to $CFLAGS])
+    fi
+  fi
+  AM_CONDITIONAL(GI_GCOV_ENABLED, test x$enable_gcov = xyes)
+])