| # Check for the extension used for executables on build platform. | |
| # This is necessary for cross-compiling where the build platform | |
| # may differ from the host platform. | |
| AC_DEFUN([AC_BUILD_EXEEXT], | |
| [ | |
| AC_MSG_CHECKING([for executable suffix on build platform]) | |
| AC_CACHE_VAL(ac_cv_build_exeext, | |
| [if test "$CYGWIN" = yes || test "$MINGW32" = yes; then | |
| ac_cv_build_exeext=.exe | |
| else | |
| ac_build_prefix=${build_alias}- | |
| AC_CHECK_PROG(BUILD_CC, ${ac_build_prefix}gcc, ${ac_build_prefix}gcc) | |
| if test -z "$BUILD_CC"; then | |
| AC_CHECK_PROG(BUILD_CC, gcc, gcc) | |
| if test -z "$BUILD_CC"; then | |
| AC_CHECK_PROG(BUILD_CC, cc, cc, , , /usr/ucb/cc) | |
| fi | |
| fi | |
| test -z "$BUILD_CC" && AC_MSG_ERROR([no acceptable cc found in \$PATH]) | |
| ac_build_link='${BUILD_CC-cc} -o conftest $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS 1>&AS_MESSAGE_LOG_FD' | |
| rm -f conftest* | |
| echo 'int main () { return 0; }' > conftest.$ac_ext | |
| ac_cv_build_exeext= | |
| if AC_TRY_EVAL(ac_build_link); then | |
| for file in conftest.*; do | |
| case $file in | |
| *.c | *.o | *.obj | *.dSYM) ;; | |
| *) ac_cv_build_exeext=`echo $file | sed -e s/conftest//` ;; | |
| esac | |
| done | |
| else | |
| AC_MSG_ERROR([installation or configuration problem: compiler cannot create executables.]) | |
| fi | |
| rm -f conftest* | |
| test x"${ac_cv_build_exeext}" = x && ac_cv_build_exeext=blank | |
| fi]) | |
| BUILD_EXEEXT="" | |
| test x"${ac_cv_build_exeext}" != xblank && BUILD_EXEEXT=${ac_cv_build_exeext} | |
| AC_MSG_RESULT(${ac_cv_build_exeext}) | |
| ac_build_exeext=$BUILD_EXEEXT | |
| AC_SUBST(BUILD_EXEEXT)]) |