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[packages/trusty/cirros-testvm.git] / cirros-testvm / src-cirros / buildroot-2015.05 / package / json-c / 0002-Link-against-libm-when-needed.patch

diff --git a/cirros-testvm/src-cirros/buildroot-2015.05/package/json-c/0002-Link-against-libm-when-needed.patch b/cirros-testvm/src-cirros/buildroot-2015.05/package/json-c/0002-Link-against-libm-when-needed.patch
new file mode 100644 (file)
index 0000000..305b782
--- /dev/null
+++ b/cirros-testvm/src-cirros/buildroot-2015.05/package/json-c/0002-Link-against-libm-when-needed.patch
@@ -0,0 +1,53 @@
+From ccb15ee3d7e8c925cb3af9ea805feea2863c4f81 Mon Sep 17 00:00:00 2001
+From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
+Date: Fri, 1 May 2015 12:52:18 +0200
+Subject: [PATCH] Link against libm when needed
+
+In certain C libraries (e.g uClibc), isnan() and related functions are
+implemented in libm, so json-c needs to link against it. This commit
+therefore adds an AC_TRY_LINK() test to check whether a program
+calling isnan() can be properly linked with no special flags. If not,
+we assume linking against libm is needed.
+
+The json-c.pc.in file is also adjusted so that in the case of static
+linking against json-c, -lm is also used.
+
+Submitted upstream: https://github.com/json-c/json-c/pull/182
+
+Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
+---
+ configure.ac | 4 ++++
+ json-c.pc.in | 3 ++-
+ 2 files changed, 6 insertions(+), 1 deletion(-)
+
+diff --git a/configure.ac b/configure.ac
+index 99660a4..2a14ccf 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -50,6 +50,10 @@ AC_CHECK_DECLS([isinf], [], [], [[#include <math.h>]])
+ AC_CHECK_DECLS([_isnan], [], [], [[#include <float.h>]])
+ AC_CHECK_DECLS([_finite], [], [], [[#include <float.h>]])
+ 
++if test "$ac_cv_have_decl_isnan" = "yes" ; then
++   AC_TRY_LINK([#include <math.h>], [float f = 0.0; return isnan(f)], [], [LIBS="$LIBS -lm"])
++fi
++
+ #check if .section.gnu.warning accepts long strings (for __warn_references)
+ AC_LANG_PUSH([C])
+ 
+diff --git a/json-c.pc.in b/json-c.pc.in
+index 037739d..05bfbc8 100644
+--- a/json-c.pc.in
++++ b/json-c.pc.in
+@@ -6,6 +6,7 @@ includedir=@includedir@
+ Name: json-c
+ Description: JSON implementation in C
+ Version: @VERSION@
+-Requires: 
++Requires:
++Libs.private: @LIBS@
+ Libs:  -L${libdir} -ljson-c
+ Cflags: -I${includedir}/json-c
+-- 
+2.1.0
+