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build-sys: require compiler running in C99 mode

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Signed-off-by: Sami Kerola <kerolasa@iki.fi>
This commit is contained in:
Sami Kerola 2012-02-25 22:52:02 +01:00 committed by Craig Small
parent 703e1e0486
commit bc3710664c
1 changed files with 17 additions and 0 deletions
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17
configure.ac
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@ -13,6 +13,23 @@ AC_CONFIG_HEADERS([config.h])
# Checks for programs.
AC_GNU_SOURCE
AC_PROG_CC
AC_PROG_CC_STDC
if test "x$ac_cv_prog_cc_c99" = "xno" || test "x$ac_cv_prog_cc_c99" = "x"; then
# We might be on RHEL5 with a git checkout and so broken
# autoconf. Check if CC is gcc and if it bails when given -std=gnu99.
# If not, use that. Yuck.
if test "x$ac_cv_c_compiler_gnu" = "xyes"; then
CC="$CC -std=gnu99"
AC_RUN_IFELSE(
[AC_LANG_PROGRAM([],[[
return 0;
]])],
[],
[AC_MSG_ERROR([Could not find a C99 compatible compiler])])
else
AC_MSG_ERROR([Could not find a C99 compatible compiler])
fi
fi
AM_PROG_CC_C_O
AC_PROG_INSTALL
AC_PROG_LN_S