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build: bump to C11

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Funnily enough, "gnu11" is gcc's default in 5.x if you don't specify
anything, yet there is no "AC_PROG_CC_C11" in autoconf.

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
This commit is contained in:
David Lamparter 2017-01-29 00:51:45 +01:00
parent fbd0bae6d6
commit 8aa42b826c
1 changed files with 8 additions and 0 deletions
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8
configure.ac
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@ -82,6 +82,7 @@ AM_PROG_CC_C_O
dnl remove autoconf default "-g -O2"
CFLAGS="$orig_cflags"
AC_PROG_CC_C99
dnl NB: see C11 below
AC_PROG_EGREP
PKG_PROG_PKG_CONFIG
@ -119,6 +120,13 @@ dnl ICC won't bail on unknown options without -diag-error 10006
dnl need to do this first so we get useful results for the other options
AC_C_FLAG([-diag-error 10006])
dnl AC_PROG_CC_C99 may change CC to include -std=gnu99 or something
ac_cc="$CC"
CC="${CC% -std=gnu99}"
CC="${CC% -std=c99}"
AC_C_FLAG([-std=gnu11], [CC="$ac_cc"], [CC="$CC -std=gnu11"])
dnl if the user specified any CFLAGS, we don't add "-g -Os/-O2" here
if test "z$orig_cflags" = "z"; then
AC_C_FLAG([-g])