70 lines
2.5 KiB
Plaintext
70 lines
2.5 KiB
Plaintext
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# AX_CPP_IDENT
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# ------------
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# Check if the C compiler supports #ident
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# Define and substitute ident_support if so.
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#
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# It would be simpler and more consistent with the rest of the autoconf
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# structure to AC_DEFINE(HAVE_CPP_IDENT) instead of
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# ident_support='-DHAVE_CVS_IDENT=1' and AC_SUBST(ident_support), but that
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# change would require all C files in the icarus top level directory to
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# put #include <config.h> before the #ifdef HAVE_CVS_IDENT (and change
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# HAVE_CVS_IDENT to HAVE_CPP_IDENT). That would also remove all special
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# ident_support handling from the Makefile. Manyana.
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#
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AC_DEFUN([AX_CPP_IDENT],
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[AC_CACHE_CHECK([for ident support in C compiler], ax_cv_cpp_ident,
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[AC_TRY_COMPILE([
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#ident "$Id: aclocal.m4,v 1.1 2003/11/08 19:27:50 steve Exp $"
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],[while (0) {}],
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[AS_VAR_SET(ax_cv_cpp_ident, yes)],
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[AS_VAR_SET(ax_cv_cpp_ident, no)])])
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if test $ax_cv_cpp_ident = yes; then
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ident_support='-DHAVE_CVS_IDENT=1'
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fi
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AC_SUBST(ident_support)
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])# AC_CPP_IDENT
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# _AX_C_UNDERSCORES_MATCH_IFELSE(PATTERN, ACTION-IF-MATCH, ACTION-IF-NOMATCH)
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# ------------------------------
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# Sub-macro for AX_C_UNDERSCORES_LEADING and AX_C_UNDERSCORES_TRAILING.
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# Unwarranted assumptions:
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# - the object file produced by AC_COMPILE_IFELSE is called "conftest.$ac_objext"
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# - the nm(1) utility is available, and its name is "nm".
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AC_DEFUN([_AX_C_UNDERSCORES_MATCH_IF],
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[AC_COMPILE_IFELSE([void underscore(void){}],
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[AS_IF([nm conftest.$ac_objext|grep $1 >/dev/null 2>/dev/null],[$2],[$3])],
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[AC_MSG_ERROR([underscore test crashed])]
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)])
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# AX_C_UNDERSCORES_LEADING
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# ---------------------------------
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# Check if symbol names in object files produced by C compiler have
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# leading underscores. Define NEED_LU if so.
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AC_DEFUN([AX_C_UNDERSCORES_LEADING],
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[AC_CACHE_CHECK([for leading underscores], ax_cv_c_underscores_leading,
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[_AX_C_UNDERSCORES_MATCH_IF([_underscore],
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[AS_VAR_SET(ax_cv_c_underscores_leading, yes)],
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[AS_VAR_SET(ax_cv_c_underscores_leading, no)])])
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if test $ax_cv_c_underscores_leading = yes; then
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AC_DEFINE(NEED_LU)
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fi
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])# AX_C_UNDERSCORES_LEADING
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# AX_C_UNDERSCORES_TRAILING
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# ---------------------------------
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# Check if symbol names in object files produced by C compiler have
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# trailing underscores. Define NEED_TU if so.
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AC_DEFUN([AX_C_UNDERSCORES_TRAILING],
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[AC_CACHE_CHECK([for trailing underscores], ax_cv_c_underscores_trailing,
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[_AX_C_UNDERSCORES_MATCH_IF([underscore_],
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[AS_VAR_SET(ax_cv_c_underscores_trailing, yes)],
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[AS_VAR_SET(ax_cv_c_underscores_trailing, no)])])
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if test $ax_cv_c_underscores_trailing = yes; then
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AC_DEFINE(NEED_TU)
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fi
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])# AX_C_UNDERSCORES_TRAILING
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