Building a cross compiler from i686-mingw32 to arm-none-eabi fails
after the move to build as C++ because config/arm/neon.md uses ffs but
no MinGW header declares ffs (and unlike in C, an implicit declaration
of this built-in function can't be used). This patch fixes this issue
by making the gcc directory configure check for a declaration, so
causing libiberty.h to provide one if needed.
Tested building a cross compiler as described above (fails before the
patch, passes afterwards). OK to commit?
2012-08-20 Joseph Myers <jos...@codesourcery.com>
* configure.ac (ffs): Check for declaration.
* configure, config.in: Regenerate.
Index: configure
===================================================================
--- configure (revision 190529)
+++ configure (working copy)
@@ -10288,7 +10288,7 @@
for ac_func in getenv atol asprintf sbrk abort atof getcwd getwd \
strsignal strstr stpcpy strverscmp \
errno snprintf vsnprintf vasprintf malloc realloc calloc \
- free basename getopt clock getpagesize clearerr_unlocked feof_unlocked
ferror_unlocked fflush_unlocked fgetc_unlocked fgets_unlocked
fileno_unlocked fprintf_unlocked fputc_unlocked fputs_unlocked fread_unlocked
fwrite_unlocked getchar_unlocked getc_unlocked putchar_unlocked putc_unlocked
+ free basename getopt clock getpagesize ffs clearerr_unlocked
feof_unlocked ferror_unlocked fflush_unlocked fgetc_unlocked fgets_unlocked
fileno_unlocked fprintf_unlocked fputc_unlocked fputs_unlocked fread_unlocked
fwrite_unlocked getchar_unlocked getc_unlocked putchar_unlocked putc_unlocked
do
ac_tr_decl=`$as_echo "HAVE_DECL_$ac_func" | $as_tr_cpp`
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $ac_func is
declared" >&5
Index: config.in
===================================================================
--- config.in (revision 190529)
+++ config.in (working copy)
@@ -621,6 +621,12 @@
#endif
+/* Define to 1 if we found a declaration for 'ffs', otherwise define to 0. */
+#ifndef USED_FOR_TARGET
+#undef HAVE_DECL_FFS
+#endif
+
+
/* Define to 1 if we found a declaration for 'fgetc_unlocked', otherwise
define to 0. */
#ifndef USED_FOR_TARGET
Index: configure.ac
===================================================================
--- configure.ac (revision 190529)
+++ configure.ac (working copy)
@@ -1075,7 +1075,7 @@
gcc_AC_CHECK_DECLS(getenv atol asprintf sbrk abort atof getcwd getwd \
strsignal strstr stpcpy strverscmp \
errno snprintf vsnprintf vasprintf malloc realloc calloc \
- free basename getopt clock getpagesize gcc_UNLOCKED_FUNCS, , ,[
+ free basename getopt clock getpagesize ffs gcc_UNLOCKED_FUNCS, , ,[
#include "ansidecl.h"
#include "system.h"])
--
Joseph S. Myers
jos...@codesourcery.com
