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Diffstat (limited to 'unit/atf-src/m4/compiler-flags.m4')
| -rw-r--r-- | unit/atf-src/m4/compiler-flags.m4 | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/unit/atf-src/m4/compiler-flags.m4 b/unit/atf-src/m4/compiler-flags.m4 new file mode 100644 index 0000000..480e5c7 --- /dev/null +++ b/unit/atf-src/m4/compiler-flags.m4 @@ -0,0 +1,159 @@ +dnl Copyright 2010 Google Inc. +dnl All rights reserved. +dnl +dnl Redistribution and use in source and binary forms, with or without +dnl modification, are permitted provided that the following conditions are +dnl met: +dnl +dnl * Redistributions of source code must retain the above copyright +dnl notice, this list of conditions and the following disclaimer. +dnl * Redistributions in binary form must reproduce the above copyright +dnl notice, this list of conditions and the following disclaimer in the +dnl documentation and/or other materials provided with the distribution. +dnl * Neither the name of Google Inc. nor the names of its contributors +dnl may be used to endorse or promote products derived from this software +dnl without specific prior written permission. +dnl +dnl THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +dnl "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +dnl LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +dnl A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +dnl OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +dnl SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +dnl LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +dnl DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +dnl THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +dnl (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +dnl OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +dnl \file compiler-flags.m4 +dnl +dnl Macros to check for the existence of compiler flags. The macros in this +dnl file support both C and C++. +dnl +dnl Be aware that, in order to detect a flag accurately, we may need to enable +dnl strict warning checking in the compiler (i.e. enable -Werror). Some +dnl compilers, e.g. Clang, report unknown -W flags as warnings unless -Werror is +dnl selected. This fact would confuse the flag checks below because we would +dnl conclude that a flag is valid while in reality it is not. To resolve this, +dnl the macros below will pass -Werror to the compiler along with any other flag +dnl being checked. + + +dnl Checks for a compiler flag and sets a result variable. +dnl +dnl This is an auxiliary macro for the implementation of _KYUA_FLAG. +dnl +dnl \param 1 The shell variable containing the compiler name. Used for +dnl reporting purposes only. C or CXX. +dnl \param 2 The shell variable containing the flags for the compiler. +dnl CFLAGS or CXXFLAGS. +dnl \param 3 The name of the compiler flag to check for. +dnl \param 4 The shell variable to set with the result of the test. Will +dnl be set to 'yes' if the flag is valid, 'no' otherwise. +dnl \param 5 Additional, optional flags to pass to the C compiler while +dnl looking for the flag in $3. We use this here to pass -Werror to the +dnl flag checks (unless we are checking for -Werror already). +AC_DEFUN([_KYUA_FLAG_AUX], [ + if test x"${$4-unset}" = xunset; then + AC_MSG_CHECKING(whether ${$1} supports $3) + saved_flags="${$2}" + $4=no + $2="${$2} $5 $3" + AC_LINK_IFELSE([AC_LANG_PROGRAM([], [return 0;])], + AC_MSG_RESULT(yes) + $4=yes, + AC_MSG_RESULT(no)) + $2="${saved_flags}" + fi +]) + + +dnl Checks for a compiler flag and appends it to a result variable. +dnl +dnl \param 1 The shell variable containing the compiler name. Used for +dnl reporting purposes only. CC or CXX. +dnl \param 2 The shell variable containing the flags for the compiler. +dnl CFLAGS or CXXFLAGS. +dnl \param 3 The name of the compiler flag to check for. +dnl \param 4 The shell variable to which to append $3 if the flag is valid. +AC_DEFUN([_KYUA_FLAG], [ + _KYUA_FLAG_AUX([$1], [$2], [-Werror], [kyua_$1_has_werror]) + if test "$3" = "-Werror"; then + found=${kyua_$1_has_werror} + else + found=unset + if test ${kyua_$1_has_werror} = yes; then + _KYUA_FLAG_AUX([$1], [$2], [$3], [found], [-Werror]) + else + _KYUA_FLAG_AUX([$1], [$2], [$3], [found], []) + fi + fi + if test ${found} = yes; then + $4="${$4} $3" + fi +]) + + +dnl Checks for a C compiler flag and appends it to a variable. +dnl +dnl \pre The current language is C. +dnl +dnl \param 1 The name of the compiler flag to check for. +dnl \param 2 The shell variable to which to append $1 if the flag is valid. +AC_DEFUN([KYUA_CC_FLAG], [ + AC_LANG_ASSERT([C]) + _KYUA_FLAG([CC], [CFLAGS], [$1], [$2]) +]) + + +dnl Checks for a C++ compiler flag and appends it to a variable. +dnl +dnl \pre The current language is C++. +dnl +dnl \param 1 The name of the compiler flag to check for. +dnl \param 2 The shell variable to which to append $1 if the flag is valid. +AC_DEFUN([KYUA_CXX_FLAG], [ + AC_LANG_ASSERT([C++]) + _KYUA_FLAG([CXX], [CXXFLAGS], [$1], [$2]) +]) + + +dnl Checks for a set of C compiler flags and appends them to CFLAGS. +dnl +dnl The checks are performed independently and only when all the checks are +dnl done, the output variable is modified. +dnl +dnl \param 1 Whitespace-separated list of C flags to check. +AC_DEFUN([KYUA_CC_FLAGS], [ + AC_LANG_PUSH([C]) + valid_cflags= + for f in $1; do + KYUA_CC_FLAG(${f}, valid_cflags) + done + if test -n "${valid_cflags}"; then + CFLAGS="${CFLAGS} ${valid_cflags}" + fi + AC_LANG_POP([C]) +]) + + +dnl Checks for a set of C++ compiler flags and appends them to CXXFLAGS. +dnl +dnl The checks are performed independently and only when all the checks are +dnl done, the output variable is modified. +dnl +dnl \pre The current language is C++. +dnl +dnl \param 1 Whitespace-separated list of C flags to check. +AC_DEFUN([KYUA_CXX_FLAGS], [ + AC_LANG_PUSH([C++]) + valid_cxxflags= + for f in $1; do + KYUA_CXX_FLAG(${f}, valid_cxxflags) + done + if test -n "${valid_cxxflags}"; then + CXXFLAGS="${CXXFLAGS} ${valid_cxxflags}" + fi + AC_LANG_POP([C++]) +]) |