diff options
Diffstat (limited to 'aclocal.m4')
| -rw-r--r-- | aclocal.m4 | 59 |
1 files changed, 59 insertions, 0 deletions
@@ -31,3 +31,62 @@ changequote([,])dnl fi AC_MSG_RESULT($ac_cv_check_symbol_$1)])dnl dnl + +dnl These modifications are to allow for an empty cross compiler tree. +dnl In the situation that cross-linking is impossible, the variable +dnl `cross_linkable' will be substituted with "yes". +AC_DEFUN(AC_PROG_CC_LOCAL, +[AC_BEFORE([$0], [AC_PROG_CPP])dnl +AC_CHECK_PROG(CC, gcc, gcc) +if test -z "$CC"; then + AC_CHECK_PROG(CC, cc, cc, , , /usr/ucb/cc) + test -z "$CC" && AC_MSG_ERROR([no acceptable cc found in \$PATH]) +fi + +AC_PROG_CC_WORKS_LOCAL +AC_PROG_CC_GNU + +dnl The following differs from the AC_PROG_CC macro in autoconf. Since +dnl we require a recent version of gcc to be used we do not need to go +dnl into lengths and test for bugs in old versions. It must be gcc 2.7 +dnl or above. +if test $ac_cv_prog_gcc = yes; then + GCC=yes + +dnl Check the version + cat > conftest.c <<EOF +#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7) + yes; +#endif +EOF + if AC_TRY_COMMAND(${CC-cc} -E conftest.c) | egrep yes >/dev/null 2>&1; then + if test -z "$CFLAGS"; then + CFLAGS="-g -O2" + fi + else + AC_MSG_ERROR([We require GNU CC version 2.7 or newer]) + fi +else + AC_MSG_ERROR([GNU libc must be compiled using GNU CC]) +fi +]) + +AC_DEFUN(AC_PROG_CC_WORKS_LOCAL, +[AC_MSG_CHECKING([whether the C compiler ($CC $CFLAGS $LDFLAGS) works]) +AC_LANG_SAVE +AC_LANG_C +AC_TRY_COMPILER([main(){return(0);}], ac_cv_prog_cc_works, ac_cv_prog_cc_cross) +AC_LANG_RESTORE +AC_MSG_RESULT($ac_cv_prog_cc_works) +if test $ac_cv_prog_cc_works = no; then + cross_linkable=no + ac_cv_prog_cc_cross=yes +dnl AC_MSG_ERROR([installation or configuration problem: C compiler cannot create executables.]) +else + cross_linkable=yes +fi +AC_MSG_CHECKING([whether the C compiler ($CC $CFLAGS $LDFLAGS) is a cross-compiler]) +AC_MSG_RESULT($ac_cv_prog_cc_cross) +AC_SUBST(cross_linkable) +cross_compiling=$ac_cv_prog_cc_cross +]) |