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# Copyright © 2004 Scott James Remnant <scott@netsplit.com>
# Copyright © 2006, 2009 Guillem Jover <guillem@debian.org>
# DPKG_COMPILER_WARNINGS
# ---------------------
# Add configure option to disable additional compiler warnings.
AC_DEFUN([DPKG_COMPILER_WARNINGS],
[AC_ARG_ENABLE(compiler-warnings,
AS_HELP_STRING([--disable-compiler-warnings],
[Disable additional compiler warnings]),
[enable_compiler_warnings=$enableval],
[enable_compiler_warnings=yes])
WFLAGS="-Wall -Wextra -Wno-unused-parameter -Wno-missing-field-initializers \
-Wmissing-declarations -Wmissing-format-attribute \
-Wvla -Winit-self -Wwrite-strings -Wcast-align -Wshadow"
WCFLAGS="-Wdeclaration-after-statement -Wnested-externs -Wbad-function-cast \
-Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition"
# Temporarily here until #542031 gets fixed in ncurses
WCXXFLAGS="-Wno-unused-value"
if test "x$enable_compiler_warnings" = "xyes"; then
if test "x$GCC" = "xyes"; then
CFLAGS="$WFLAGS $WCFLAGS $CFLAGS"
fi
if test "x$GXX" = "xyes"; then
CXXFLAGS="$WFLAGS $WCXXFLAGS $CXXFLAGS"
fi
fi
])
# DPKG_COMPILER_OPTIMISATIONS
# --------------------------
# Add configure option to disable optimisations.
AC_DEFUN([DPKG_COMPILER_OPTIMISATIONS],
[AC_ARG_ENABLE(compiler-optimisations,
AS_HELP_STRING([--disable-compiler-optimisations],
[Disable compiler optimisations]),
[if test "x$enable_compiler_optimisations" = "xno"; then
[CFLAGS=$(echo "$CFLAGS" | sed -e "s/ -O[[1-9]]*\b/ -O0/g")]
fi])dnl
])
# DPKG_TRY_C99([ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
# ------------------------------------------------------
# Try compiling some C99 code to see whether it works
AC_DEFUN([DPKG_TRY_C99],
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include <inttypes.h>
#include <stdbool.h>
#include <stdio.h>
/* Variadic macro arguments */
#define variadic_macro(foo, ...) printf(foo, __VA_ARGS__)
]],
[[
/* Compound initialisers */
struct { int a, b; } foo = { .a = 1, .b = 2 };
/* Trailing comma in enum */
enum { first, second, } quux;
/* Boolean type */
bool bar = false;
/* Specific size type */
uint32_t baz = 0;
/* Magic __func__ variable */
printf("%s", __func__);
]])], [$1], [$2])dnl
])# DPKG_TRY_C99
# DPKG_C_C99
# ----------
# Check whether the compiler can do C99
AC_DEFUN([DPKG_C_C99],
[AC_CACHE_CHECK([whether compiler supports C99 features], [dpkg_cv_c99],
[DPKG_TRY_C99([dpkg_cv_c99=yes], [dpkg_cv_c99=no])])
AS_IF([test "x$dpkg_cv_c99" = "xyes"],
[AC_DEFINE([HAVE_C99], 1, [Define to 1 if the compiler supports C99.])],
[AC_CACHE_CHECK([what argument makes compiler support C99 features],
[dpkg_cv_c99_arg],
[dpkg_cv_c99_arg=none
dpkg_save_CC="$CC"
for arg in "-std=gnu99" "-std=c99" "-c99" "-AC99" \
"-xc99=all" "-qlanglvl=extc99"; do
CC="$dpkg_save_CC $arg"
DPKG_TRY_C99([dpkg_arg_worked=yes], [dpkg_arg_worked=no])
CC="$dpkg_save_CC"
AS_IF([test "x$dpkg_arg_worked" = "xyes"],
[dpkg_cv_c99_arg="$arg"; break])
done])
AS_IF([test "x$dpkg_cv_c99_arg" != "xnone"],
[CC="$CC $dpkg_cv_c99_arg"
AC_DEFINE([HAVE_C99], 1)],
[AC_MSG_ERROR([unsupported required C99 extensions])])])[]dnl
])# DPKG_C_C99
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