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Add TOCK_CHECK_CFLAGS for checking compiler flags.

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This commit is contained in:
Adam Sampson 2011-08-10 12:37:47 +00:00
parent a741719169
commit 760baa710e
1 changed files with 35 additions and 54 deletions
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89
configure.ac
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@ -131,77 +131,58 @@ if test "x$cppcsp_available$ccsp_available" = "xfalsefalse"; then
fi
#Check whether their compiler supports the -fgnu89-inline flag:
#Must use the C language for this:
AC_LANG(C)
AC_MSG_CHECKING([whether -fgnu89-inline flag is accepted])
old_CFLAGS="$CFLAGS"
CFLAGS="-fgnu89-inline"
AC_COMPILE_IFELSE(AC_LANG_PROGRAM([[ ]]),
AC_MSG_RESULT([yes])
# TOCK_CHECK_CFLAGS(flags,if-true,if-false)
AC_DEFUN([TOCK_CHECK_CFLAGS],[
AC_MSG_CHECKING([whether C compiler accepts $1])
AC_LANG_PUSH(C)
old_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS $1"
AC_COMPILE_IFELSE(AC_LANG_PROGRAM([[ ]]),[
AC_MSG_RESULT([yes])
$2
],[
AC_MSG_RESULT([no])
$3
])
CFLAGS="$old_CFLAGS"
AC_LANG_POP(C)
])
TOCK_CHECK_CFLAGS([-fgnu89-inline],[
gnu89_inline=-fgnu89-inline
,
AC_MSG_RESULT([no])
],[
gnu89_inline=
)
])
#Check whether GCC accepts the -fno-strict-overflow setting:
AC_MSG_CHECKING([whether -fno-strict-overflow flag is accepted])
CFLAGS="-fno-strict-overflow"
AC_COMPILE_IFELSE(AC_LANG_PROGRAM([[ ]]),
AC_MSG_RESULT([yes])
TOCK_CHECK_CFLAGS([-fno-strict-overflow],[
no_strict_overflow=-fno-strict-overflow
,
AC_MSG_RESULT([no])
],[
no_strict_overflow=
)
])
#Check whether GCC accepts the -fno-strict-aliasing setting:
AC_MSG_CHECKING([whether -fno-strict-aliasing flag is accepted])
CFLAGS="-fno-strict-aliasing"
AC_COMPILE_IFELSE(AC_LANG_PROGRAM([[ ]]),
AC_MSG_RESULT([yes])
TOCK_CHECK_CFLAGS([-fno-strict-aliasing],[
no_strict_aliasing=-fno-strict-aliasing
,
AC_MSG_RESULT([no])
],[
no_strict_aliasing=
)
])
#Check whether GCC accepts the -fno-tree-vrp setting:
AC_MSG_CHECKING([whether -fno-tree-vrp flag is accepted])
CFLAGS="-fno-tree-vrp"
AC_COMPILE_IFELSE(AC_LANG_PROGRAM([[ ]]),
AC_MSG_RESULT([yes])
TOCK_CHECK_CFLAGS([-fno-tree-vrp],[
no_tree_vrp=-fno-tree-vrp
,
AC_MSG_RESULT([no])
],[
no_tree_vrp=
)
])
#Check whether GCC accepts the -Wno-unused-parameter -Wno-unused-variable flags:
AC_MSG_CHECKING([whether -Wno-unused-parameter and -Wno-unused-variable flags are accepted])
CFLAGS="-Wno-unused-parameter -Wno-unused-variable"
AC_COMPILE_IFELSE(AC_LANG_PROGRAM([[ ]]),
AC_MSG_RESULT([yes])
TOCK_CHECK_CFLAGS([-Wno-unused-parameter -Wno-unused-variable],[
no_unused="-Wno-unused-parameter -Wno-unused-variable"
,
AC_MSG_RESULT([no])
],[
no_unused=
)
])
#Check whether GCC accepts the -Werror=cast-qual option
AC_MSG_CHECKING([whether -Werror=cast-qual flag is accepted])
CFLAGS="-Werror=cast-qual"
AC_COMPILE_IFELSE(AC_LANG_PROGRAM([[ ]]),
AC_MSG_RESULT([yes])
TOCK_CHECK_CFLAGS([-Werror=cast-qual],[
warn_error="-Werror=cast-qual"
,
AC_MSG_RESULT([no])
],[
warn_error=
)
CFLAGS="$old_CFLAGS"
])
# Check the sizes of certain constructs. We'll need to be cleverer if in future