diff options
Diffstat (limited to 'meta/recipes-devtools/json-c/json-c/0001-Link-against-libm-when-needed.patch')
| -rw-r--r-- | meta/recipes-devtools/json-c/json-c/0001-Link-against-libm-when-needed.patch | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/meta/recipes-devtools/json-c/json-c/0001-Link-against-libm-when-needed.patch b/meta/recipes-devtools/json-c/json-c/0001-Link-against-libm-when-needed.patch new file mode 100644 index 0000000000..bfe9d72313 --- /dev/null +++ b/meta/recipes-devtools/json-c/json-c/0001-Link-against-libm-when-needed.patch @@ -0,0 +1,53 @@ +From 93582ad85ef48c18ac12f00a9a9e124989b1fcab 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. + +Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> +--- +Upstream-Status: Backport + + configure.ac | 4 ++++ + json-c.pc.in | 3 ++- + 2 files changed, 6 insertions(+), 1 deletion(-) + +diff --git a/configure.ac b/configure.ac +index c50f81b..30e7174 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 +-- +2.8.1 + |