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Made the configure script check if certain GCC flags are supported before using them

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This commit is contained in:
Neil Brown 2009-01-23 14:16:39 +00:00
parent e71af91e48
commit 732080557c
1 changed files with 38 additions and 2 deletions
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40
configure.ac
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@ -113,8 +113,44 @@ AC_COMPILE_IFELSE(AC_LANG_PROGRAM([[ ]]),
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])
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])
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])
no_tree_vrp=-fno-tree-vrp
,
AC_MSG_RESULT([no])
no_tree_vrp=
)
CFLAGS="$old_CFLAGS"
AC_MSG_CHECKING([Checking GHC version])
ghc_version=`ghc --numeric-version`
@ -157,7 +193,7 @@ AC_CHECK_SIZEOF(int)
AC_COMPUTE_INT(C_INT_SIZE,SIZEOF_INT)
AC_SUBST(C_INT_SIZE)
CFLAGS="$CFLAGS -fno-strict-overflow -fno-tree-vrp"
CFLAGS="$CFLAGS $no_strict_overflow $no_tree_vrp"
# The reason for -fno-strict-overflow and -fno-tree-vrp above is that with the way I have implemented
# range checking, on GCC 4.3.2 (and probably other versions), GCC has
# a bug triggered that causes invalid behaviour (spurious overflows can happen)
@ -169,7 +205,7 @@ CFLAGS="$CFLAGS -fno-strict-overflow -fno-tree-vrp"
# that, but I'm also leaving these flags in so that any other code (for example,
# that Tock might spit out) that uses increments doesn't have the same issue.
common_cflags="-Wall -ggdb3 -Isupport -fno-strict-aliasing"
common_cflags="-Wall -ggdb3 -Isupport $no_strict_aliasing"
TOCK_CFLAGS="$gnu89_inline $CPPFLAGS $CFLAGS $common_cflags $CCSP_CFLAGS $GLIB_CFLAGS"
TOCK_CLDFLAGS="$LDFLAGS $CCSP_LIBS $GLIB_LIBS"