+dnl CF_GCC_ATTRIBUTES version: 13 updated: 2009/08/11 20:19:56
+dnl -----------------
+dnl Test for availability of useful gcc __attribute__ directives to quiet
+dnl compiler warnings. Though useful, not all are supported -- and contrary
+dnl to documentation, unrecognized directives cause older compilers to barf.
+AC_DEFUN([CF_GCC_ATTRIBUTES],
+[
+if test "$GCC" = yes
+then
+cat > conftest.i <<EOF
+#ifndef GCC_PRINTF
+#define GCC_PRINTF 0
+#endif
+#ifndef GCC_SCANF
+#define GCC_SCANF 0
+#endif
+#ifndef GCC_NORETURN
+#define GCC_NORETURN /* nothing */
+#endif
+#ifndef GCC_UNUSED
+#define GCC_UNUSED /* nothing */
+#endif
+EOF
+if test "$GCC" = yes
+then
+ AC_CHECKING([for $CC __attribute__ directives])
+cat > conftest.$ac_ext <<EOF
+#line __oline__ "${as_me-configure}"
+#include "confdefs.h"
+#include "conftest.h"
+#include "conftest.i"
+#if GCC_PRINTF
+#define GCC_PRINTFLIKE(fmt,var) __attribute__((format(printf,fmt,var)))
+#else
+#define GCC_PRINTFLIKE(fmt,var) /*nothing*/
+#endif
+#if GCC_SCANF
+#define GCC_SCANFLIKE(fmt,var) __attribute__((format(scanf,fmt,var)))
+#else
+#define GCC_SCANFLIKE(fmt,var) /*nothing*/
+#endif
+extern void wow(char *,...) GCC_SCANFLIKE(1,2);
+extern void oops(char *,...) GCC_PRINTFLIKE(1,2) GCC_NORETURN;
+extern void foo(void) GCC_NORETURN;
+int main(int argc GCC_UNUSED, char *argv[[]] GCC_UNUSED) { return 0; }
+EOF
+ cf_printf_attribute=no
+ cf_scanf_attribute=no
+ for cf_attribute in scanf printf unused noreturn
+ do
+ CF_UPPER(cf_ATTRIBUTE,$cf_attribute)
+ cf_directive="__attribute__(($cf_attribute))"
+ echo "checking for $CC $cf_directive" 1>&AC_FD_CC
+
+ case $cf_attribute in #(vi
+ printf) #(vi
+ cf_printf_attribute=yes
+ cat >conftest.h <<EOF
+#define GCC_$cf_ATTRIBUTE 1
+EOF
+ ;;
+ scanf) #(vi
+ cf_scanf_attribute=yes
+ cat >conftest.h <<EOF
+#define GCC_$cf_ATTRIBUTE 1
+EOF
+ ;;
+ *) #(vi
+ cat >conftest.h <<EOF
+#define GCC_$cf_ATTRIBUTE $cf_directive
+EOF
+ ;;
+ esac
+
+ if AC_TRY_EVAL(ac_compile); then
+ test -n "$verbose" && AC_MSG_RESULT(... $cf_attribute)
+ cat conftest.h >>confdefs.h
+ case $cf_attribute in #(vi
+ printf) #(vi
+ if test "$cf_printf_attribute" = no ; then
+ cat >>confdefs.h <<EOF
+#define GCC_PRINTFLIKE(fmt,var) /* nothing */
+EOF
+ else
+ cat >>confdefs.h <<EOF
+#define GCC_PRINTFLIKE(fmt,var) __attribute__((format(printf,fmt,var)))
+EOF
+ fi
+ ;;
+ scanf) #(vi
+ if test "$cf_scanf_attribute" = no ; then
+ cat >>confdefs.h <<EOF
+#define GCC_SCANFLIKE(fmt,var) /* nothing */
+EOF
+ else
+ cat >>confdefs.h <<EOF
+#define GCC_SCANFLIKE(fmt,var) __attribute__((format(scanf,fmt,var)))
+EOF
+ fi
+ ;;
+ esac
+ fi
+ done
+else
+ fgrep define conftest.i >>confdefs.h
+fi
+rm -rf conftest*
+fi
+])dnl
+dnl ---------------------------------------------------------------------------
+dnl CF_GCC_VERSION version: 4 updated: 2005/08/27 09:53:42
+dnl --------------
+dnl Find version of gcc
+AC_DEFUN([CF_GCC_VERSION],[
+AC_REQUIRE([AC_PROG_CC])
+GCC_VERSION=none
+if test "$GCC" = yes ; then
+ AC_MSG_CHECKING(version of $CC)
+ GCC_VERSION="`${CC} --version| sed -e '2,$d' -e 's/^.*(GCC) //' -e 's/^[[^0-9.]]*//' -e 's/[[^0-9.]].*//'`"
+ test -z "$GCC_VERSION" && GCC_VERSION=unknown
+ AC_MSG_RESULT($GCC_VERSION)
+fi
+])dnl
+dnl ---------------------------------------------------------------------------
+dnl CF_GCC_WARNINGS version: 24 updated: 2009/02/01 15:21:00
+dnl ---------------
+dnl Check if the compiler supports useful warning options. There's a few that
+dnl we don't use, simply because they're too noisy:
+dnl
+dnl -Wconversion (useful in older versions of gcc, but not in gcc 2.7.x)
+dnl -Wredundant-decls (system headers make this too noisy)
+dnl -Wtraditional (combines too many unrelated messages, only a few useful)
+dnl -Wwrite-strings (too noisy, but should review occasionally). This
+dnl is enabled for ncurses using "--enable-const".
+dnl -pedantic
+dnl
+dnl Parameter:
+dnl $1 is an optional list of gcc warning flags that a particular
+dnl application might want to use, e.g., "no-unused" for
+dnl -Wno-unused
+dnl Special:
+dnl If $with_ext_const is "yes", add a check for -Wwrite-strings
+dnl
+AC_DEFUN([CF_GCC_WARNINGS],
+[
+AC_REQUIRE([CF_GCC_VERSION])
+CF_INTEL_COMPILER(GCC,INTEL_COMPILER,CFLAGS)
+
+cat > conftest.$ac_ext <<EOF
+#line __oline__ "${as_me-configure}"
+int main(int argc, char *argv[[]]) { return (argv[[argc-1]] == 0) ; }
+EOF
+
+if test "$INTEL_COMPILER" = yes
+then
+# The "-wdXXX" options suppress warnings:
+# remark #1419: external declaration in primary source file
+# remark #1683: explicit conversion of a 64-bit integral type to a smaller integral type (potential portability problem)
+# remark #1684: conversion from pointer to same-sized integral type (potential portability problem)
+# remark #193: zero used for undefined preprocessing identifier
+# remark #593: variable "curs_sb_left_arrow" was set but never used
+# remark #810: conversion from "int" to "Dimension={unsigned short}" may lose significant bits
+# remark #869: parameter "tw" was never referenced
+# remark #981: operands are evaluated in unspecified order
+# warning #279: controlling expression is constant
+
+ AC_CHECKING([for $CC warning options])
+ cf_save_CFLAGS="$CFLAGS"
+ EXTRA_CFLAGS="-Wall"
+ for cf_opt in \
+ wd1419 \
+ wd1683 \
+ wd1684 \
+ wd193 \
+ wd593 \
+ wd279 \
+ wd810 \
+ wd869 \
+ wd981
+ do
+ CFLAGS="$cf_save_CFLAGS $EXTRA_CFLAGS -$cf_opt"
+ if AC_TRY_EVAL(ac_compile); then
+ test -n "$verbose" && AC_MSG_RESULT(... -$cf_opt)
+ EXTRA_CFLAGS="$EXTRA_CFLAGS -$cf_opt"
+ fi
+ done
+ CFLAGS="$cf_save_CFLAGS"
+
+elif test "$GCC" = yes
+then
+ AC_CHECKING([for $CC warning options])
+ cf_save_CFLAGS="$CFLAGS"
+ EXTRA_CFLAGS="-W -Wall"
+ cf_warn_CONST=""
+ test "$with_ext_const" = yes && cf_warn_CONST="Wwrite-strings"
+ for cf_opt in \
+ Wbad-function-cast \
+ Wcast-align \
+ Wcast-qual \
+ Winline \
+ Wmissing-declarations \
+ Wmissing-prototypes \
+ Wnested-externs \
+ Wpointer-arith \
+ Wshadow \
+ Wstrict-prototypes \
+ Wundef $cf_warn_CONST $1
+ do
+ CFLAGS="$cf_save_CFLAGS $EXTRA_CFLAGS -$cf_opt"
+ if AC_TRY_EVAL(ac_compile); then
+ test -n "$verbose" && AC_MSG_RESULT(... -$cf_opt)
+ case $cf_opt in #(vi
+ Wcast-qual) #(vi
+ CPPFLAGS="$CPPFLAGS -DXTSTRINGDEFINES"
+ ;;
+ Winline) #(vi
+ case $GCC_VERSION in
+ [[34]].*)
+ CF_VERBOSE(feature is broken in gcc $GCC_VERSION)
+ continue;;
+ esac
+ ;;
+ esac
+ EXTRA_CFLAGS="$EXTRA_CFLAGS -$cf_opt"
+ fi
+ done
+ CFLAGS="$cf_save_CFLAGS"
+fi
+rm -f conftest*
+
+AC_SUBST(EXTRA_CFLAGS)
+])dnl
+dnl ---------------------------------------------------------------------------
+dnl CF_GNU_SOURCE version: 6 updated: 2005/07/09 13:23:07