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json-c: add patch to make sure the library is linked against libm when needed

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On uClibc, a number of symbols such as isnan() are in libm and not
libc, so we might need to link against libm. This commit adds a patch
to json-c that does this.

Fixes:

  http://autobuild.buildroot.net/results/94d/94dd7f38ae105e7cd2f342d718e27a65edcf3a3d/

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
This commit is contained in:
Thomas Petazzoni 2015-05-01 12:59:37 +02:00
parent f431f5540e
commit 4e99abc475
2 changed files with 57 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
package/json-c/0001-don-t-threat-warnings-as-errors.patch
View File

@ -1,7 +1,7 @@
From e81a30a35107643323950ef6803eddebecb33344 Mon Sep 17 00:00:00 2001
From 2b4a43a94fb988e344f2d7edc74d6a4a5f64571d Mon Sep 17 00:00:00 2001
From: Sagaert Johan <sagaert.johan@proximus.be>
Date: Wed, 15 Apr 2015 00:40:46 +0200
Subject: [PATCH 1/1] don't threat warnings as errors
Subject: [PATCH] don't threat warnings as errors
Signed-off-by: Sagaert Johan <sagaert.johan@proximus.be>
---
@ -9,7 +9,7 @@ Signed-off-by: Sagaert Johan <sagaert.johan@proximus.be>
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/Makefile.am.inc b/Makefile.am.inc
index fec591b..61db1d2 100644
index fec591b..5eb461e 100644
--- a/Makefile.am.inc
+++ b/Makefile.am.inc
@@ -1,2 +1,2 @@
@ -17,5 +17,5 @@ index fec591b..61db1d2 100644
+AM_CFLAGS = -Wall -Wno-error=deprecated-declarations -Wextra -Wwrite-strings -std=gnu99 -D_GNU_SOURCE -D_REENTRANT
--
2.3.3
2.1.0

53
package/json-c/0002-Link-against-libm-when-needed.patch Normal file
View File

@ -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