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build: enforce C11 as minimum compiler standard #617

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14 changes: 13 additions & 1 deletion configure.ac
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Original file line number Diff line number Diff line change
Expand Up @@ -44,9 +44,21 @@ AC_CANONICAL_HOST
AC_CANONICAL_BUILD
AC_CANONICAL_TARGET
AM_INIT_AUTOMAKE([-Wall -Werror foreign subdir-objects])

AC_PROG_CC
AC_USE_SYSTEM_EXTENSIONS
AC_PROG_CC_C99
dnl
dnl Check that compiler supports C11 or newer standard
dnl
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([[
#if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 201112L
# error C11 or newer required
#endif
]])],
[],
[AC_MSG_ERROR([C11 or newer compiler required (GCC >= 4.9, Clang >= 3.3)])]
)
AM_PROG_CC_C_O
AM_PROG_AR
AC_PROG_LIBTOOL
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