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configure: add warning related flags

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adds TEST_AND_ADD_CFLAGS function
uses AM_CFLAGS to allow CFLAGS override

Change-Id: I9352aec6e5d905a41d832bf5ad0c8dcd154f7e97
(cherry picked from commit bba4c2b2a6)
This commit is contained in:
James Zern 2013-05-06 17:18:27 -07:00
parent e676b04309
commit 8ecec68652
1 changed files with 24 additions and 0 deletions
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24
configure.ac
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@ -31,6 +31,30 @@ AC_ARG_WITH([pkgconfigdir], AS_HELP_STRING([--with-pkgconfigdir=DIR],
[pkgconfigdir="$withval"], [pkgconfigdir='${libdir}/pkgconfig'])
AC_SUBST([pkgconfigdir])
dnl === TEST_AND_ADD_CFLAGS(flag)
dnl === Checks whether $CC supports 'flag' and adds it to AM_CFLAGS on success.
AC_DEFUN([TEST_AND_ADD_CFLAGS],
[SAVED_CFLAGS="$CFLAGS"
CFLAGS="-Werror $1"
AC_MSG_CHECKING([whether $CC supports $1])
dnl Note AC_LANG_PROGRAM([]) uses an old-style main definition.
AC_COMPILE_IFELSE([AC_LANG_SOURCE([int main(void) { return 0; }])],
[AC_MSG_RESULT([yes])]
[AS_VAR_APPEND([AM_CFLAGS], [" $1"])],
[AC_MSG_RESULT([no])])
CFLAGS="$SAVED_CFLAGS"])
TEST_AND_ADD_CFLAGS([-Wall])
TEST_AND_ADD_CFLAGS([-Wdeclaration-after-statement])
TEST_AND_ADD_CFLAGS([-Wextra])
TEST_AND_ADD_CFLAGS([-Wmissing-declarations])
TEST_AND_ADD_CFLAGS([-Wmissing-prototypes])
TEST_AND_ADD_CFLAGS([-Wold-style-definition])
TEST_AND_ADD_CFLAGS([-Wshadow])
TEST_AND_ADD_CFLAGS([-Wunused-but-set-variable])
TEST_AND_ADD_CFLAGS([-Wunused])
TEST_AND_ADD_CFLAGS([-Wvla])
AC_SUBST([AM_CFLAGS])
dnl === CLEAR_LIBVARS([var_pfx])
dnl === Clears <var_pfx>_{INCLUDES,LIBS}.
AC_DEFUN([CLEAR_LIBVARS], [$1_INCLUDES=""; $1_LIBS=""])