a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl Copyright 2010 Google Inc.
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a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl Macros to check for the existence of compiler flags. The macros in this
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl file support both C and C++.
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl Be aware that, in order to detect a flag accurately, we may need to enable
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl strict warning checking in the compiler (i.e. enable -Werror). Some
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl compilers, e.g. Clang, report unknown -W flags as warnings unless -Werror is
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl selected. This fact would confuse the flag checks below because we would
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl conclude that a flag is valid while in reality it is not. To resolve this,
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl the macros below will pass -Werror to the compiler along with any other flag
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl being checked.
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl Checks for a compiler flag and sets a result variable.
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl This is an auxiliary macro for the implementation of _KYUA_FLAG.
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl \param 1 The shell variable containing the compiler name. Used for
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl reporting purposes only. C or CXX.
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl \param 2 The shell variable containing the flags for the compiler.
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl CFLAGS or CXXFLAGS.
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl \param 3 The name of the compiler flag to check for.
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl \param 4 The shell variable to set with the result of the test. Will
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl be set to 'yes' if the flag is valid, 'no' otherwise.
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl \param 5 Additional, optional flags to pass to the C compiler while
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl looking for the flag in $3. We use this here to pass -Werror to the
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl flag checks (unless we are checking for -Werror already).
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan HuntAC_DEFUN([_KYUA_FLAG_AUX], [
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Hunt if test x"${$4-unset}" = xunset; then
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Hunt AC_MSG_CHECKING(whether ${$1} supports $3)
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Hunt saved_flags="${$2}"
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Hunt $2="${$2} $5 $3"
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Hunt AC_LINK_IFELSE([AC_LANG_PROGRAM([], [return 0;])],
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Hunt AC_MSG_RESULT(yes)
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Hunt AC_MSG_RESULT(no))
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Hunt $2="${saved_flags}"
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl Checks for a compiler flag and appends it to a result variable.
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl \param 1 The shell variable containing the compiler name. Used for
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl reporting purposes only. CC or CXX.
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl \param 2 The shell variable containing the flags for the compiler.
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl CFLAGS or CXXFLAGS.
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl \param 3 The name of the compiler flag to check for.
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl \param 4 The shell variable to which to append $3 if the flag is valid.
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan HuntAC_DEFUN([_KYUA_FLAG], [
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Hunt _KYUA_FLAG_AUX([$1], [$2], [-Werror], [kyua_$1_has_werror])
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Hunt if test "$3" = "-Werror"; then
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Hunt found=${kyua_$1_has_werror}
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Hunt if test ${kyua_$1_has_werror} = yes; then
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Hunt _KYUA_FLAG_AUX([$1], [$2], [$3], [found], [-Werror])
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Hunt _KYUA_FLAG_AUX([$1], [$2], [$3], [found], [])
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Hunt if test ${found} = yes; then
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Hunt $4="${$4} $3"
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl Checks for a C compiler flag and appends it to a variable.
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl \pre The current language is C.
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl \param 1 The name of the compiler flag to check for.
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl \param 2 The shell variable to which to append $1 if the flag is valid.
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan HuntAC_DEFUN([KYUA_CC_FLAG], [
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Hunt AC_LANG_ASSERT([C])
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Hunt _KYUA_FLAG([CC], [CFLAGS], [$1], [$2])
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl Checks for a C++ compiler flag and appends it to a variable.
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl \pre The current language is C++.
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl \param 1 The name of the compiler flag to check for.
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl \param 2 The shell variable to which to append $1 if the flag is valid.
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan HuntAC_DEFUN([KYUA_CXX_FLAG], [
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Hunt AC_LANG_ASSERT([C++])
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Hunt _KYUA_FLAG([CXX], [CXXFLAGS], [$1], [$2])
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl Checks for a set of C compiler flags and appends them to CFLAGS.
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl The checks are performed independently and only when all the checks are
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl done, the output variable is modified.
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl \param 1 Whitespace-separated list of C flags to check.
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan HuntAC_DEFUN([KYUA_CC_FLAGS], [
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Hunt AC_LANG_PUSH([C])
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt valid_cflags=
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt for f in $1; do
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Hunt KYUA_CC_FLAG(${f}, valid_cflags)
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt if test -n "${valid_cflags}"; then
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Hunt CFLAGS="${CFLAGS} ${valid_cflags}"
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Hunt AC_LANG_POP([C])
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl Checks for a set of C++ compiler flags and appends them to CXXFLAGS.
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl The checks are performed independently and only when all the checks are
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl done, the output variable is modified.
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl \pre The current language is C++.
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Huntdnl \param 1 Whitespace-separated list of C flags to check.
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan HuntAC_DEFUN([KYUA_CXX_FLAGS], [
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Hunt AC_LANG_PUSH([C++])
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt valid_cxxflags=
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt for f in $1; do
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Hunt KYUA_CXX_FLAG(${f}, valid_cxxflags)
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt if test -n "${valid_cxxflags}"; then
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Hunt CXXFLAGS="${CXXFLAGS} ${valid_cxxflags}"
a747113422afaa29ce72d2c5ba7f0b7ea9ec2054Evan Hunt AC_LANG_POP([C++])