[PATCH 1/4] Handle AC_SEARCH_LIBS special result value

[Ulrich Klauer]

AC_SEARCH_LIBS will give a result of "none required" if the relevant
function is available without any special libraries. (This is the case
for lrintf on MinGW.) Make sure this special value isn't put verbatim
into the pkg-config files, as it would cause the linker to search for
files named "none" and "required", and fail.
---
 configure.ac               |    6 +++++-
 opusfile-uninstalled.pc.in |    2 +-
 opusfile.pc.in             |    2 +-
 3 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/configure.ac b/configure.ac
index 8b1a3b3..113086d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -107,7 +107,11 @@ AS_IF([test "x$enable_fixed_point" = "xyes"],
    ])
   ]
 )
-AC_SUBST(ac_cv_search_lrintf)
+lrintf_lib="$ac_cv_search_lrintf"
+AS_IF([test "x$ac_cv_search_lrintf" = "xnone required"],
+  [lrintf_lib=""]
+)
+AC_SUBST(lrintf_lib)
 
 CC_ATTRIBUTE_VISIBILITY([default], [
   CC_FLAG_VISIBILITY([CFLAGS="${CFLAGS} -fvisibility=hidden"])
diff --git a/opusfile-uninstalled.pc.in b/opusfile-uninstalled.pc.in
index b63a23c..9002552 100644
--- a/opusfile-uninstalled.pc.in
+++ b/opusfile-uninstalled.pc.in
@@ -10,5 +10,5 @@ Description: Opus playback library (not installed)
 Version: @VERSION@
 Requires: ogg >= 1.3 opus >= 1.0.1 @openssl@
 Conflicts:
-Libs: ${libdir}/libopusfile.la @ac_cv_search_lrintf@
+Libs: ${libdir}/libopusfile.la @lrintf_lib@
 Cflags: -I${includedir}
diff --git a/opusfile.pc.in b/opusfile.pc.in
index 0a77f0c..4a2895e 100644
--- a/opusfile.pc.in
+++ b/opusfile.pc.in
@@ -11,5 +11,5 @@ Version: @VERSION@
 Requires: ogg >= 1.3 opus >= 1.0.1 @openssl@
 Conflicts:
 Libs: -L${libdir} -lopusfile
-Libs.private: @ac_cv_search_lrintf@
+Libs.private: @lrintf_lib@
 Cflags: -I${includedir}/opus
-- 
1.7.10.4


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