-dnl $Id: aclocal.m4,v 1.27 1998/08/16 16:45:37 sof Exp $
+dnl $Id: aclocal.m4,v 1.29 1998/10/05 14:15:32 simonm Exp $
dnl
dnl Extra autoconf macros for the Glasgow fptools
dnl
dnl
dnl We assume that they _haven't_ if anything goes wrong.
dnl
+dnl Some nlist implementations seem to try to be compatible by ignoring
+dnl a leading underscore sometimes (eg. FreeBSD). We therefore have
+dnl to work around this by checking for *no* leading underscore first.
+dnl Sigh. --SDM
+dnl
AC_DEFUN(FPTOOLS_UNDERSCORE,
[AC_CHECK_LIB(elf, nlist, LIBS="-lelf $LIBS")dnl
AC_CACHE_CHECK([leading underscore in symbol names], fptools_cv_lead_uscore,
<<
case $HostPlatform in
alpha-dec-osf*) fptools_cv_lead_uscore='no';;
+*cygwin32) fptools_cv_lead_uscore='yes';;
*) >>
changequote([, ])dnl
AC_TRY_RUN([#ifdef HAVE_NLIST_H
#include <nlist.h>
changequote(<<, >>)dnl
<<
-struct nlist xYzzY[] = {{"_xYzzY", 0},{0}};
+struct nlist xYzzY1[] = {{"xYzzY1", 0},{0}};
+struct nlist xYzzY2[] = {{"_xYzzY2", 0},{0}};
#endif
main(argc, argv)
char **argv;
{
#ifdef HAVE_NLIST_H
- if(nlist(argv[0], xYzzY) == 0 && xYzzY[0].n_value != 0)
+ if(nlist(argv[0], xYzzY1) == 0 && xYzzY1[0].n_value != 0)
+ exit(1);
+ if(nlist(argv[0], xYzzY2) == 0 && xYzzY2[0].n_value != 0)
exit(0);>>
changequote([, ])dnl
#endif
fi
])
+dnl *** Which one comes first, .text or .data? ***
+dnl
+AC_DEFUN(FPTOOLS_CODE_BEFORE_DATA,
+[AC_CACHE_CHECK([if code section appears before data], fptools_cv_code_bef_data,
+[AC_TRY_RUN([
+int f() { return 1; }
+int i;
+int main() { return ((char*)&f > (char*)&i); }
+
+],
+fptools_cv_code_bef_data=yes, fptools_cv_code_bef_data=no)])
+if test "$fptools_cv_code_bef_data" = yes; then
+ AC_DEFINE(CODE_BEFORE_DATA)
+fi
+])
+
+dnl *** Helper function **
+dnl
+AC_DEFUN(FPTOOLS_IN_SCOPE,AC_TRY_LINK([extern char* $1;],[return (int)&$2], $3=yes, $3=no))
+
+dnl *** What's the end-of-text-section marker called? ***
+dnl
+AC_DEFUN(FPTOOLS_END_TEXT_SECTION,
+[AC_CACHE_CHECK([for end of text section marker], fptools_cv_end_of_text,
+[
+not_done=1
+for i in etext _etext __etext; do
+ FPTOOLS_IN_SCOPE($i,$i,fptools_cv_end_of_text)
+ if test "$fptools_cv_end_of_text" = yes; then
+ AC_DEFINE(TEXT_SECTION_END_MARKER, $i)
+ not_done=0
+ break
+ fi
+done
+if test "$not_done"; then
+FPTOOLS_IN_SCOPE(etext asm("etext"),etext,fptools_cv_end_of_text);
+if test "$fptools_cv_end_of_text" = yes; then
+ AC_DEFINE(TEXT_SECTION_END_MARKER, etext asm("etext"))
+else
+ AC_DEFINE(TEXT_SECTION_END_MARKER, dunno_what_it_is)
+fi
+fi
+])])
+
+dnl *** What's the end-of-data-section marker called? ***
+dnl
+AC_DEFUN(FPTOOLS_END_DATA_SECTION,
+[AC_CACHE_CHECK([for end of data section marker], fptools_cv_end_of_data,
+[
+not_done=1
+for i in end _end __end; do
+ FPTOOLS_IN_SCOPE($i,$i,fptools_cv_end_of_data)
+ if test "$fptools_cv_end_of_data" = yes; then
+ AC_DEFINE(DATA_SECTION_END_MARKER, $i)
+ not_done=0
+ break
+ fi
+done
+if test "$not_done"; then
+FPTOOLS_IN_SCOPE(end asm("end"),end,fptools_cv_end_of_data);
+if test "$fptools_cv_end_of_data" = yes; then
+ AC_DEFINE(DATA_SECTION_END_MARKER, end asm("end"))
+else
+ AC_DEFINE(DATA_SECTION_END_MARKER, dunno_what_it_is)
+fi
+fi
+])])