diff options
Diffstat (limited to 'config/acx.m4')
| -rw-r--r-- | config/acx.m4 | 96 |
1 files changed, 94 insertions, 2 deletions
diff --git a/config/acx.m4 b/config/acx.m4 index ab7f98a21..09bac1c6c 100644 --- a/config/acx.m4 +++ b/config/acx.m4 @@ -177,16 +177,108 @@ acx_cv_cc_gcc_supports_ada=no # has not been installed. This is fixed in 2.95.4, 3.0.2, and 3.1. # Therefore we must check for the error message as well as an # unsuccessful exit. +# Other compilers, like HP Tru64 UNIX cc, exit successfully when +# given a .adb file, but produce no object file. So we must check +# if an object file was really produced to guard against this. errors=`(${CC} -c conftest.adb) 2>&1 || echo failure` -if test x"$errors" = x; then +if test x"$errors" = x && test -f conftest.$ac_objext; then acx_cv_cc_gcc_supports_ada=yes break fi rm -f conftest.*]) -if test x$GNATBIND != xno && test x$acx_cv_gcc_supports_ada != xno; then +if test x$GNATBIND != xno && test x$acx_cv_cc_gcc_supports_ada != xno; then have_gnat=yes else have_gnat=no fi ]) + +dnl 'make compare' can be significantly faster, if cmp itself can +dnl skip bytes instead of using tail. The test being performed is +dnl "if cmp --ignore-initial=2 t1 t2 && ! cmp --ignore-initial=1 t1 t2" +dnl but we need to sink errors and handle broken shells. We also test +dnl for the parameter format "cmp file1 file2 skip1 skip2" which is +dnl accepted by cmp on some systems. +AC_DEFUN([ACX_PROG_CMP_IGNORE_INITIAL], +[AC_CACHE_CHECK([how to compare bootstrapped objects], gcc_cv_prog_cmp_skip, +[ echo abfoo >t1 + echo cdfoo >t2 + gcc_cv_prog_cmp_skip='tail +16c $$f1 > tmp-foo1; tail +16c $$f2 > tmp-foo2; cmp tmp-foo1 tmp-foo2' + if cmp t1 t2 2 2 > /dev/null 2>&1; then + if cmp t1 t2 1 1 > /dev/null 2>&1; then + : + else + gcc_cv_prog_cmp_skip='cmp $$f1 $$f2 16 16' + fi + fi + if cmp --ignore-initial=2 t1 t2 > /dev/null 2>&1; then + if cmp --ignore-initial=1 t1 t2 > /dev/null 2>&1; then + : + else + gcc_cv_prog_cmp_skip='cmp --ignore-initial=16 $$f1 $$f2' + fi + fi + rm t1 t2 +]) +do_compare="$gcc_cv_prog_cmp_skip" +AC_SUBST(do_compare) +]) + +dnl See whether we can include both string.h and strings.h. +AC_DEFUN([ACX_HEADER_STRING], +[AC_CACHE_CHECK([whether string.h and strings.h may both be included], + gcc_cv_header_string, +[AC_TRY_COMPILE([#include <string.h> +#include <strings.h>], , gcc_cv_header_string=yes, gcc_cv_header_string=no)]) +if test $gcc_cv_header_string = yes; then + AC_DEFINE(STRING_WITH_STRINGS, 1, [Define if you can safely include both <string.h> and <strings.h>.]) +fi +]) + +dnl See if stdbool.h properly defines bool and true/false. +dnl Check whether _Bool is built-in. +AC_DEFUN([ACX_HEADER_STDBOOL], +[AC_CACHE_CHECK([for working stdbool.h], + ac_cv_header_stdbool_h, +[AC_TRY_COMPILE([#include <stdbool.h>], +[bool foo = false;], +ac_cv_header_stdbool_h=yes, ac_cv_header_stdbool_h=no)]) +if test $ac_cv_header_stdbool_h = yes; then + AC_DEFINE(HAVE_STDBOOL_H, 1, + [Define if you have a working <stdbool.h> header file.]) +fi +AC_CACHE_CHECK(for built-in _Bool, gcc_cv_c__bool, +[AC_TRY_COMPILE(, +[_Bool foo;], +gcc_cv_c__bool=yes, gcc_cv_c__bool=no) +]) +if test $gcc_cv_c__bool = yes; then + AC_DEFINE(HAVE__BOOL, 1, [Define if the \`_Bool' type is built-in.]) +fi +]) + +dnl See if hard links work and if not, try to substitute $1 or simple copy. +AC_DEFUN([ACX_PROG_LN], +[AC_MSG_CHECKING(whether ln works) +AC_CACHE_VAL(acx_cv_prog_LN, +[rm -f conftestdata_t +echo >conftestdata_f +if ln conftestdata_f conftestdata_t 2>/dev/null +then + acx_cv_prog_LN=ln +else + acx_cv_prog_LN=no +fi +rm -f conftestdata_f conftestdata_t +])dnl +if test $acx_cv_prog_LN = no; then + LN="ifelse([$1],,cp,[$1])" + AC_MSG_RESULT([no, using $LN]) +else + LN="$acx_cv_prog_LN" + AC_MSG_RESULT(yes) +fi +AC_SUBST(LN)dnl +]) + |