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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>
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