1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
|
# serial 1
# Copyright © 2004 Scott James Remnant <scott@netsplit.com>
# Copyright © 2006, 2009-2011, 2013-2016 Guillem Jover <guillem@debian.org>
# DPKG_CHECK_COMPILER_FLAG
# ------------------------
AC_DEFUN([DPKG_CHECK_COMPILER_FLAG], [
m4_define([dpkg_check_flag], m4_bpatsubst([$1], [^-Wno-], [-W]))
AC_LANG_CASE(
[C], [
m4_define([dpkg_compiler], [$CC])
m4_define([dpkg_varname], [CFLAGS])
m4_define([dpkg_varname_save], [dpkg_save_CFLAGS])
m4_define([dpkg_varname_export], [COMPILER_CFLAGS])
AS_VAR_PUSHDEF([dpkg_varname_cache], [dpkg_cv_cflags_$1])
],
[C++], [
m4_define([dpkg_compiler], [$CXX])
m4_define([dpkg_varname], [CXXFLAGS])
m4_define([dpkg_varname_save], [dpkg_save_CXXFLAGS])
m4_define([dpkg_varname_export], [COMPILER_CXXFLAGS])
AS_VAR_PUSHDEF([dpkg_varname_cache], [dpkg_cv_cxxflags_$1])
])
AC_CACHE_CHECK([whether ]dpkg_compiler[ accepts $1], [dpkg_varname_cache], [
AS_VAR_COPY([dpkg_varname_save], [dpkg_varname])
AS_VAR_SET([dpkg_varname], ["-Werror dpkg_check_flag"])
AC_COMPILE_IFELSE([
AC_LANG_SOURCE([[]])
], [
AS_VAR_SET([dpkg_varname_cache], [yes])
], [
AS_VAR_SET([dpkg_varname_cache], [no])
])
AS_VAR_COPY([dpkg_varname], [dpkg_varname_save])
])
AS_VAR_IF([dpkg_varname_cache], [yes], [
AS_VAR_APPEND([dpkg_varname_export], [" $1"])
])
AS_VAR_POPDEF([dpkg_varname_cache])
])
# DPKG_CHECK_COMPILER_WARNINGS
# ----------------------------
# Add configure option to disable additional compiler warnings.
AC_DEFUN([DPKG_CHECK_COMPILER_WARNINGS], [
DPKG_CHECK_COMPILER_FLAG([-Wall])
DPKG_CHECK_COMPILER_FLAG([-Wextra])
DPKG_CHECK_COMPILER_FLAG([-Wcast-align])
DPKG_CHECK_COMPILER_FLAG([-Wdocumentation])
DPKG_CHECK_COMPILER_FLAG([-Wduplicated-cond])
DPKG_CHECK_COMPILER_FLAG([-Wformat -Wformat-security])
DPKG_CHECK_COMPILER_FLAG([-Winit-self])
DPKG_CHECK_COMPILER_FLAG([-Wlogical-not-parentheses])
DPKG_CHECK_COMPILER_FLAG([-Wlogical-op])
DPKG_CHECK_COMPILER_FLAG([-Wmissing-declarations])
DPKG_CHECK_COMPILER_FLAG([-Wmissing-format-attribute])
DPKG_CHECK_COMPILER_FLAG([-Wno-missing-field-initializers])
DPKG_CHECK_COMPILER_FLAG([-Wno-nonnull-compare])
DPKG_CHECK_COMPILER_FLAG([-Wno-tautological-constant-out-of-range-compare])
DPKG_CHECK_COMPILER_FLAG([-Wno-unused-parameter])
DPKG_CHECK_COMPILER_FLAG([-Wnull-dereference])
DPKG_CHECK_COMPILER_FLAG([-Wpointer-arith])
DPKG_CHECK_COMPILER_FLAG([-Wrestrict])
DPKG_CHECK_COMPILER_FLAG([-Wregister])
DPKG_CHECK_COMPILER_FLAG([-Wshadow])
DPKG_CHECK_COMPILER_FLAG([-Wshift-negative-value])
DPKG_CHECK_COMPILER_FLAG([-Wsizeof-array-argument])
DPKG_CHECK_COMPILER_FLAG([-Wswitch-bool])
DPKG_CHECK_COMPILER_FLAG([-Wvla])
DPKG_CHECK_COMPILER_FLAG([-Wwrite-strings])
AC_LANG_CASE(
[C], [
DPKG_CHECK_COMPILER_FLAG([-Wbad-function-cast])
DPKG_CHECK_COMPILER_FLAG([-Wc99-c11-compat])
DPKG_CHECK_COMPILER_FLAG([-Wdeclaration-after-statement])
DPKG_CHECK_COMPILER_FLAG([-Wmissing-prototypes])
DPKG_CHECK_COMPILER_FLAG([-Wnested-externs])
DPKG_CHECK_COMPILER_FLAG([-Wold-style-definition])
DPKG_CHECK_COMPILER_FLAG([-Wstrict-prototypes])
],
[C++], [
DPKG_CHECK_COMPILER_FLAG([-Wc++11-compat])
AS_IF([test "x$dpkg_cv_cxx11" = "xyes"], [
DPKG_CHECK_COMPILER_FLAG([-Wzero-as-null-pointer-constant])
])
])
])
# 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 (detected) additional compiler warnings])],
[], [enable_compiler_warnings=yes])
AS_IF([test "x$enable_compiler_warnings" = "xyes"], [
DPKG_CHECK_COMPILER_WARNINGS
AC_LANG_PUSH([C++])
DPKG_CHECK_COMPILER_WARNINGS
AC_LANG_POP([C++])
CFLAGS="$COMPILER_CFLAGS $CFLAGS"
CXXFLAGS="$COMPILER_CXXFLAGS $CXXFLAGS"
])
])
# DPKG_COMPILER_OPTIMIZATIONS
# ---------------------------
# Add configure option to disable optimizations.
AC_DEFUN([DPKG_COMPILER_OPTIMIZATIONS], [
AC_ARG_ENABLE([compiler-optimizations],
[AS_HELP_STRING([--disable-compiler-optimizations],
[Disable (detected) compiler optimizations])],
[], [enable_compiler_optimizations=yes])
AS_IF([test "x$enable_compiler_optimizations" = "xno"], [
CFLAGS=$(echo "$CFLAGS" | sed -e "s/ -O[[1-9]]*\b/ -O0/g")
])
])
# 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__)
]], [[
int rc;
/* Designated initializers. */
struct { int a, b; } foo = { .a = 1, .b = 2 };
/* Compound literals. */
struct point { int x, y; } p = (struct point){ .x = 0, .y = 1 };
p = (struct point){ .x = 2, .y = 4 };
/* Trailing comma in enum. */
enum { FIRST, SECOND, } quux;
/* Boolean type. */
bool bar = false;
/* Specific size type. */
uint32_t baz = 0;
size_t size = SIZE_MAX;
intmax_t imax = INTMAX_MAX;
/* Format modifiers. */
rc = printf("%jd", imax);
if (rc == 3)
return 1;
rc = printf("%zu", size);
if (rc == 3)
return 1;
/* 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 $CC supports C99 features], [dpkg_cv_c99], [
DPKG_TRY_C99([dpkg_cv_c99=yes], [dpkg_cv_c99=no])
])
AS_IF([test "x$dpkg_cv_c99" != "xyes"], [
AC_CACHE_CHECK([for $CC option to accept C99 features], [dpkg_cv_c99_arg], [
dpkg_cv_c99_arg=none
dpkg_save_CC="$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 $dpkg_cv_c99_arg"
dpkg_cv_c99=1
])
])
AS_IF([test "x$dpkg_cv_c99" = "xyes"], [
AC_DEFINE([HAVE_C99], 1, [Define to 1 if the compiler supports C99.])
], [
AC_MSG_ERROR([unsupported required C99 extensions])
])
])# DPKG_C_C99
# DPKG_TRY_CXX11([ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
# --------------
# Try compiling some C++11 code to see whether it works.
AC_DEFUN([DPKG_TRY_CXX11], [
AC_LANG_PUSH([C++])
AC_COMPILE_IFELSE([
AC_LANG_PROGRAM([[
]], [[
// Null pointer keyword.
void *ptr = nullptr;
]])
], [$1], [$2])
AC_LANG_POP([C++])dnl
])# DPKG_TRY_CXX11
# DPKG_CXX_CXX11
# --------------
# Check whether the compiler can do C++11.
AC_DEFUN([DPKG_CXX_CXX11], [
AC_CACHE_CHECK([whether $CXX supports C++11], [dpkg_cv_cxx11], [
DPKG_TRY_CXX11([dpkg_cv_cxx11=yes], [dpkg_cv_cxx11=no])
])
AS_IF([test "x$dpkg_cv_cxx11" != "xyes"], [
AC_CACHE_CHECK([for $CXX option to accept C++11], [dpkg_cv_cxx11_arg], [
dpkg_cv_cxx11_arg=none
dpkg_save_CXX="$CXX"
for arg in "-std=gnu++11" "-std=c++11"; do
CXX="$dpkg_save_CXX $arg"
DPKG_TRY_CXX11([dpkg_arg_worked=yes], [dpkg_arg_worked=no])
CXX="$dpkg_save_CXX"
AS_IF([test "x$dpkg_arg_worked" = "xyes"], [
dpkg_cv_cxx11_arg="$arg"; break
])
done
])
AS_IF([test "x$dpkg_cv_cxx11_arg" != "xnone"], [
CXX="$CXX $dpkg_cv_cxx11_arg"
dpkg_cv_cxx11=yes
])
])
AS_IF([test "x$dpkg_cv_cxx11" = "xyes"], [
AC_DEFINE([HAVE_CXX11], 1, [Define to 1 if the compiler supports C++11.])
])[]dnl
])# DPKG_CXX_CXX11
|
