diff options
Diffstat (limited to 'gdb/acinclude.m4')
| -rw-r--r-- | gdb/acinclude.m4 | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/gdb/acinclude.m4 b/gdb/acinclude.m4 index d3c00aeca26..a85ce024f2f 100644 --- a/gdb/acinclude.m4 +++ b/gdb/acinclude.m4 @@ -943,3 +943,56 @@ AC_DEFUN([AC_DEFINE_DIR], [ AC_DEFINE_UNQUOTED($1, "$ac_define_dir", $3)) ]) +dnl See whether we need a declaration for a function. +dnl The result is highly dependent on the INCLUDES passed in, so make sure +dnl to use a different cache variable name in this macro if it is invoked +dnl in a different context somewhere else. +dnl gcc_AC_CHECK_DECL(SYMBOL, +dnl [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND [, INCLUDES]]]) +AC_DEFUN(gcc_AC_CHECK_DECL, +[AC_MSG_CHECKING([whether $1 is declared]) +AC_CACHE_VAL(gcc_cv_have_decl_$1, +[AC_TRY_COMPILE([$4], +[#ifndef $1 +char *(*pfn) = (char *(*)) $1 ; +#endif], eval "gcc_cv_have_decl_$1=yes", eval "gcc_cv_have_decl_$1=no")]) +if eval "test \"`echo '$gcc_cv_have_decl_'$1`\" = yes"; then + AC_MSG_RESULT(yes) ; ifelse([$2], , :, [$2]) +else + AC_MSG_RESULT(no) ; ifelse([$3], , :, [$3]) +fi +])dnl + +dnl Check multiple functions to see whether each needs a declaration. +dnl Arrange to define HAVE_DECL_<FUNCTION> to 0 or 1 as appropriate. +dnl gcc_AC_CHECK_DECLS(SYMBOLS, +dnl [ACTION-IF-NEEDED [, ACTION-IF-NOT-NEEDED [, INCLUDES]]]) +AC_DEFUN(gcc_AC_CHECK_DECLS, +[for ac_func in $1 +do +changequote(, )dnl + ac_tr_decl=HAVE_DECL_`echo $ac_func | tr 'abcdefghijklmnopqrstuvwxyz' 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'` +changequote([, ])dnl +gcc_AC_CHECK_DECL($ac_func, + [AC_DEFINE_UNQUOTED($ac_tr_decl, 1) $2], + [AC_DEFINE_UNQUOTED($ac_tr_decl, 0) $3], +dnl It is possible that the include files passed in here are local headers +dnl which supply a backup declaration for the relevant prototype based on +dnl the definition of (or lack of) the HAVE_DECL_ macro. If so, this test +dnl will always return success. E.g. see libiberty.h's handling of +dnl `basename'. To avoid this, we define the relevant HAVE_DECL_ macro to +dnl 1 so that any local headers used do not provide their own prototype +dnl during this test. +#undef $ac_tr_decl +#define $ac_tr_decl 1 + $4 +) +done +dnl Automatically generate config.h entries via autoheader. +if test x = y ; then + patsubst(translit([$1], [a-z], [A-Z]), [\w+], + [AC_DEFINE([HAVE_DECL_\&], 1, + [Define to 1 if we found this declaration otherwise define to 0.])])dnl +fi +]) + |