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Use autoconf's ability to choose the latest version of C

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Modern AC_PROG_CC will add flags to enable C11 when necessary.

* configure.ac: remove AC_PROG_CC_C99, rely on updated AC_PROG_CC
This commit is contained in:
Mike Gran 2022-09-15 03:34:19 -07:00
parent bec1918b38
commit 78a98062a4
1 changed files with 4 additions and 12 deletions
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16
configure.ac
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@ -106,19 +106,11 @@ case "$enable_lto" in
;; ;;
esac esac
# Sadly, there is no released version of Autoconf with a nice AC_MSG_CHECKING([compiler's C standard])
# C11-ensuring macro. This should work for gcc/clang within the last 5 if test "$ac_prog_cc_stdc" = "c89"; then
# years though. AC_MSG_ERROR([Support for C99 required but not found.])
AC_MSG_CHECKING([how to enable C11 support])
if test "$GCC" = yes; then
AC_MSG_RESULT([-std=gnu11])
CC="$CC -std=gnu11"
else else
dnl Guile requires C99 or later. AC_MSG_RESULT([$ac_prog_cc_stdc])
AC_PROG_CC_C99
if test "$ac_cv_prog_cc_c99" = "xno"; then
AC_MSG_ERROR([Support for C99 required but not found.])
fi
fi fi
# Gnulib uses gperf when building from git # Gnulib uses gperf when building from git