[empathy] Add a configure option for GProf

[Alban Crequy <albanc src gnome org>]

commit ec1594416d7fc29c7baeeb10f7645934a9679bb5
Author: Alban Crequy <alban crequy collabora co uk>
Date:   Mon Aug 22 16:57:52 2011 +0100

    Add a configure option for GProf
    
    It should help to investigate
    https://bugzilla.gnome.org/show_bug.cgi?id=657086

 configure.ac |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 9773190..cb60cf5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -152,6 +152,17 @@ AS_COMPILER_FLAG(-Wstrict-prototypes, ERROR_CFLAGS="$ERROR_CFLAGS -Wstrict-proto
 
 AC_SUBST(ERROR_CFLAGS)
 
+AC_ARG_ENABLE(gprof,
+            AS_HELP_STRING([--enable-gprof=@<:@no/yes@:>@],
+            [build with support for gprof]),,
+            [enable_gprof=no])
+if test "x$enable_gprof" != "xno" ; then
+    CFLAGS="$CFLAGS -pg"
+    LDFLAGS="$LDFLAGS -pg"
+fi
+
+AC_SUBST(LDFLAGS)
+
 # -----------------------------------------------------------
 # Pkg-Config dependency checks
 # -----------------------------------------------------------
@@ -639,6 +650,7 @@ Configure summary:
 
 	Compiler....................:  ${CC}
 	Compiler Flags..............:  ${CFLAGS} ${ERROR_CFLAGS}
+	Linker Flags................:  ${LDFLAGS}
 	Prefix......................:  ${prefix}
 	Coding style checks.........:  ${ENABLE_CODING_STYLE_CHECKS}