configure.ac: drop macro 'AC_PROG_CC_C99' from autoconf 2.70
The macro AC_PROG_CC_C99 has been obsoleted by autoconf 2.70 and triggers a set of warnings from both 'aclocal' and 'autoconf'. The test of AC_PROG_CC_C99 is now included in AC_PROG_CC. For autoconf 2.69 and earlier the macro is still required, so cannot be simply dropped. Use a conditional test to avoid the warning on autoconf 2.70 but still use AC_PROG_CC_C99 on older autoconf. Change-Id: I5e8437f5a826fb63be6d07bcb5bb824f94683020 Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com> Reviewed-on: http://openocd.zylin.com/6009 Tested-by: jenkins Reviewed-by: Marc Schink <dev@zapb.de>
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@ -25,7 +25,8 @@ AH_BOTTOM([
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AC_LANG([C])
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AC_PROG_CC
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AC_PROG_CC_C99
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# autoconf 2.70 obsoletes AC_PROG_CC_C99 and includes it in AC_PROG_CC
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m4_version_prereq([2.70],[],[AC_PROG_CC_C99])
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AM_PROG_CC_C_O
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AC_PROG_RANLIB
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PKG_PROG_PKG_CONFIG([0.23])
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