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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>
This commit is contained in:
Antonio Borneo 2021-01-09 19:51:42 +01:00
parent 0b248e04c1
commit 8b7569c219
1 changed files with 2 additions and 1 deletions
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3
configure.ac
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@ -25,7 +25,8 @@ AH_BOTTOM([
AC_LANG([C])
AC_PROG_CC
AC_PROG_CC_C99
# autoconf 2.70 obsoletes AC_PROG_CC_C99 and includes it in AC_PROG_CC
m4_version_prereq([2.70],[],[AC_PROG_CC_C99])
AM_PROG_CC_C_O
AC_PROG_RANLIB
PKG_PROG_PKG_CONFIG([0.23])