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optimize check for compiler and linker flags. 

do it once with all flags and just test individual if fails. Saves
dozen of compiler/linker runs.



SVN revision: 82983
This commit is contained in:
Gustavo Sverzut Barbieri 2013-01-18 15:25:00 +00:00
parent ab07b8bd5f
commit 331f3583c7
1 changed files with 36 additions and 44 deletions
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80
m4/efl_compiler.m4
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@ -6,93 +6,85 @@ dnl Macro that check if compiler of linker flags are available
dnl Macro that checks for a compiler flag availability
dnl
dnl EFL_CHECK_COMPILER_FLAG(EFL, FLAG[, ACTION-IF-FOUND[ ,ACTION-IF-NOT-FOUND]])
dnl _EFL_CHECK_COMPILER_FLAGS(EFL, FLAGS)
dnl AC_SUBST : EFL_CFLAGS (EFL being replaced by its value)
AC_DEFUN([EFL_CHECK_COMPILER_FLAG],
[
m4_pushdef([UPEFL], m4_translit([[$1]], [-a-z], [_A-Z]))
m4_pushdef([UP], m4_translit([[$2]], [-a-z], [_A-Z]))
dnl have_flag: yes or no.
AC_DEFUN([_EFL_CHECK_COMPILER_FLAGS],
[dnl
m4_pushdef([UPEFL], m4_translit([[$1]], [-a-z], [_A-Z]))dnl
dnl store in options -Wfoo if -Wno-foo is passed
option=m4_bpatsubst([[$2]], [-Wno-], [-W])
option="m4_bpatsubst([[$2]], [-Wno-], [-W])"
CFLAGS_save="${CFLAGS}"
CFLAGS="${CFLAGS} ${option}"
AC_LANG_PUSH([C])
AC_MSG_CHECKING([whether the compiler supports $2])
AC_MSG_CHECKING([whether the compiler supports $2])
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([[]])],
[have_flag="yes"],
[have_flag="no"])
AC_MSG_RESULT([${have_flag}])
CFLAGS="${CFLAGS_save}"
AC_LANG_POP([C])
CFLAGS="${CFLAGS_save}"
if test "x${have_flag}" = "xyes" ; then
UPEFL[_CFLAGS]="${UPEFL[_CFLAGS]} [$2]"
fi
AC_ARG_VAR(UPEFL[_CFLAGS], [preprocessor flags for $2])
AC_SUBST(UPEFL[_CFLAGS])
m4_popdef([UP])
m4_popdef([UPEFL])
AC_SUBST(UPEFL[_CFLAGS])dnl
m4_popdef([UPEFL])dnl
])
dnl Macro that iterates over a sequence of white separated flags
dnl and that call EFL_CHECK_COMPILER_FLAG() for each of these flags
dnl
dnl EFL_CHECK_COMPILER_FLAGS(EFL, FLAGS)
dnl Checks if FLAGS are supported and add to EFL_CLFAGS.
dnl
dnl It will first try every flag at once, if one fails will try them one by one.
AC_DEFUN([EFL_CHECK_COMPILER_FLAGS],
[
m4_foreach_w([flag], [$2], [EFL_CHECK_COMPILER_FLAG([$1], m4_defn([flag]))])
[dnl
_EFL_CHECK_COMPILER_FLAGS([$1], [$2])
if test "${have_flag}" != "yes"; then
m4_foreach_w([flag], [$2], [_EFL_CHECK_COMPILER_FLAGS([$1], m4_defn([flag]))])
fi
])
dnl Macro that checks for a linker flag availability
dnl
dnl EFL_CHECK_LINKER_FLAG(EFL, FLAG[, ACTION-IF-FOUND[ ,ACTION-IF-NOT-FOUND]])
dnl _EFL_CHECK_LINKER_FLAGS(EFL, FLAGS)
dnl AC_SUBST : EFL_LDFLAGS (EFL being replaced by its value)
AC_DEFUN([EFL_CHECK_LINKER_FLAG],
[
m4_pushdef([UPEFL], m4_translit([[$1]], [-a-z], [_A-Z]))
m4_pushdef([UP], m4_translit([[$2]], [,-a-z], [__A-Z]))
dnl have_flag: yes or no
AC_DEFUN([_EFL_CHECK_LINKER_FLAGS],
[dnl
m4_pushdef([UPEFL], m4_translit([[$1]], [-a-z], [_A-Z]))dnl
LDFLAGS_save="${LDFLAGS}"
LDFLAGS="${LDFLAGS} $2"
AC_LANG_PUSH([C])
AC_MSG_CHECKING([whether the linker supports $2])
AC_MSG_CHECKING([whether the linker supports $2])
AC_LINK_IFELSE(
[AC_LANG_PROGRAM([[]])],
[have_flag="yes"],
[have_flag="no"])
AC_MSG_RESULT([${have_flag}])
LDFLAGS="${LDFLAGS_save}"
AC_LANG_POP([C])
LDFLAGS="${LDFLAGS_save}"
if test "x${have_flag}" = "xyes" ; then
UPEFL[_LDFLAGS]="${UPEFL[_LDFLAGS]} [$2]"
fi
AC_SUBST(UPEFL[_LDFLAGS])
m4_popdef([UP])
m4_popdef([UPEFL])
AC_SUBST(UPEFL[_LDFLAGS])dnl
m4_popdef([UPEFL])dnl
])
dnl Macro that iterates over a sequence of white separated flags
dnl and that call EFL_CHECK_LINKER_FLAG() for each of these flags
dnl
dnl EFL_CHECK_LINKER_FLAGS(EFL, FLAGS)
dnl Checks if FLAGS are supported and add to EFL_CLFAGS.
dnl
dnl It will first try every flag at once, if one fails will try them one by one.
AC_DEFUN([EFL_CHECK_LINKER_FLAGS],
[
m4_foreach_w([flag], [$2], [EFL_CHECK_LINKER_FLAG([$1], m4_defn([flag]))])
])
[dnl
_EFL_CHECK_LINKER_FLAGS([$1], [$2])
if test "${have_flag}" != "yes"; then
m4_foreach_w([flag], [$2], [_EFL_CHECK_LINKER_FLAGS([$1], m4_defn([flag]))])
fi
])dnl