summaryrefslogtreecommitdiff
path: root/source4/build/m4/check_cc.m4
blob: 4769d5087d5437f54fe7781a6601395ee20d534d (plain)
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
dnl SMB Build Environment CC Checks
dnl -------------------------------------------------------
dnl  Copyright (C) Stefan (metze) Metzmacher 2004
dnl  Released under the GNU GPL
dnl -------------------------------------------------------
dnl

# don't let the AC_PROG_CC macro auto set the CFLAGS
OLD_CFLAGS="${CFLAGS}"
AC_PROG_CC
CFLAGS="${OLD_CFLAGS}"
if test x"$CC" = x""; then
	AC_MSG_WARN([No c compiler was not found!])
	AC_MSG_ERROR([Please Install gcc from http://gcc.gnu.org/])
fi

#
# Set the debug symbol option if we have
# --enable-*developer or --enable-debug
# and the compiler supports it
#
if test x$ac_cv_prog_cc_g = xyes -a x$debug = xyes; then
	CFLAGS="${CFLAGS} -g"
fi

dnl needed before AC_TRY_COMPILE
AC_ISC_POSIX

AC_C_INLINE

AC_CACHE_CHECK([that the C compiler can precompile header files],samba_cv_precompiled_headers, [
	dnl Check whether the compiler can generate precompiled headers
	touch conftest.h
	if ${CC-cc} conftest.h 2> /dev/null && test -f conftest.h.gch; then
		precompiled_headers=yes
	else
		precompiled_headers=no
	fi])
AC_SUBST(precompiled_headers)


dnl Check if the C compiler understands volatile (it should, being ANSI).
AC_CACHE_CHECK([that the C compiler understands volatile],samba_cv_volatile, [
	AC_TRY_COMPILE([#include <sys/types.h>],[volatile int i = 0],
		samba_cv_volatile=yes,samba_cv_volatile=no)])
if test x"$samba_cv_volatile" = x"yes"; then
	AC_DEFINE(HAVE_VOLATILE, 1, [Whether the C compiler understands volatile])
fi

############################################
# check if the compiler can do immediate structures
AC_CACHE_CHECK([for immediate structures],samba_cv_immediate_structures, [
    AC_TRY_COMPILE([
#include <stdio.h>],
[
   typedef struct {unsigned x;} FOOBAR;
   #define X_FOOBAR(x) ((FOOBAR) { x })
   #define FOO_ONE X_FOOBAR(1)
   FOOBAR f = FOO_ONE;   
   static struct {
	FOOBAR y; 
	} f2[] = {
		{FOO_ONE}
	};   
],
	samba_cv_immediate_structures=yes,samba_cv_immediate_structures=no)])
if test x"$samba_cv_immediate_structures" = x"yes"; then
   AC_DEFINE(HAVE_IMMEDIATE_STRUCTURES,1,[Whether the compiler supports immediate structures])
fi
AC_SUBST(samba_cv_immediate_structures)

############################################
# check if the compiler handles c99 struct initialization
LIBREPLACE_C99_STRUCT_INIT(samba_cv_c99_struct_initialization=yes,
		    samba_cv_c99_struct_initialization=no)

if test x"$samba_cv_c99_struct_initialization" != x"yes"; then
	AC_MSG_WARN([C compiler does not support c99 struct initialization!])
	AC_MSG_ERROR([Please Install gcc from http://gcc.gnu.org/])
fi

############################################
# check if the compiler can handle negative enum values
# and don't truncate the values to INT_MAX
# a runtime test is needed here
AC_CACHE_CHECK([that the C compiler understands negative enum values],SMB_BUILD_CC_NEGATIVE_ENUM_VALUES, [
    AC_TRY_RUN(
[
	#include <stdio.h>
	enum negative_values { NEGATIVE_VALUE = 0xFFFFFFFF };
	int main(void) {
		enum negative_values v1 = NEGATIVE_VALUE;
		unsigned v2 = NEGATIVE_VALUE;

		if (v1 != 0xFFFFFFFF) {
			printf("%u != 0xFFFFFFFF\n", v1);
			return 1;
		}
		if (v2 != 0xFFFFFFFF) {
			printf("%u != 0xFFFFFFFF\n", v2);
			return 1;
		}

		return 0;
	}
],
	SMB_BUILD_CC_NEGATIVE_ENUM_VALUES=yes,SMB_BUILD_CC_NEGATIVE_ENUM_VALUES=no)])
if test x"$SMB_BUILD_CC_NEGATIVE_ENUM_VALUES" != x"yes"; then
	AC_MSG_WARN([using --unit-enums for pidl])
	PIDL_ARGS="$PIDL_ARGS --uint-enums"
fi

AC_MSG_CHECKING([for test routines])
AC_TRY_RUN([#include "${srcdir-.}/build/tests/trivial.c"],
	    AC_MSG_RESULT(yes),
	    AC_MSG_ERROR([cant find test code. Aborting config]),
	    AC_MSG_WARN([cannot run when cross-compiling]))

#
# Check if the compiler support ELF visibility for symbols
#

visibility_attribute=no
VISIBILITY_CFLAGS=""
if test x"$GCC" = x"yes" ; then
	AX_CFLAGS_GCC_OPTION([-fvisibility=hidden], VISIBILITY_CFLAGS)
fi

if test -n "$VISIBILITY_CFLAGS"; then
	AC_MSG_CHECKING([whether the C compiler supports the visibility attribute])
	OLD_CFLAGS="$CFLAGS"

	CFLAGS="$CFLAGS $VISIBILITY_CFLAGS"
	AC_TRY_RUN([
		void vis_foo1(void) {}
		__attribute__((visibility("default"))) void vis_foo2(void) {}
		#include "${srcdir-.}/build/tests/trivial.c"
	],[
		AC_MSG_RESULT(yes)
		AC_DEFINE(HAVE_VISIBILITY_ATTR,1,[Whether the C compiler supports the visibility attribute])
		visibility_attribute=yes
	],[
		AC_MSG_RESULT(no)
	])
	CFLAGS="$OLD_CFLAGS"
fi
AC_SUBST(visibility_attribute)

#
# Check if the compiler can handle the options we selected by
# --enable-*developer
#
DEVELOPER_CFLAGS=""
if test x$developer = xyes; then
    	OLD_CFLAGS="${CFLAGS}"

	CFLAGS="${CFLAGS} -D_SAMBA_DEVELOPER_DONNOT_USE_O2_"
	DEVELOPER_CFLAGS="-DDEBUG_PASSWORD -DDEVELOPER"
	if test x"$GCC" = x"yes" ; then
	    #
	    # warnings we want...
	    #
	    AX_CFLAGS_GCC_OPTION(-Wall, DEVELOPER_CFLAGS)
	    AX_CFLAGS_GCC_OPTION(-Wshadow, DEVELOPER_CFLAGS)
	    AX_CFLAGS_GCC_OPTION(-Werror-implicit-function-declaration, DEVELOPER_CFLAGS)
	    AX_CFLAGS_GCC_OPTION(-Wstrict-prototypes, DEVELOPER_CFLAGS)
	    AX_CFLAGS_GCC_OPTION(-Wpointer-arith, DEVELOPER_CFLAGS)
	    AX_CFLAGS_GCC_OPTION(-Wcast-qual, DEVELOPER_CFLAGS)
	    AX_CFLAGS_GCC_OPTION(-Wcast-align, DEVELOPER_CFLAGS)
	    AX_CFLAGS_GCC_OPTION(-Wwrite-strings, DEVELOPER_CFLAGS)
	    AX_CFLAGS_GCC_OPTION(-Wmissing-format-attribute, DEVELOPER_CFLAGS)
	    AX_CFLAGS_GCC_OPTION(-Wformat=2, DEVELOPER_CFLAGS)
	    AX_CFLAGS_GCC_OPTION(-Wdeclaration-after-statement, DEVELOPER_CFLAGS)
	    AX_CFLAGS_GCC_OPTION(-Wunused-macros, DEVELOPER_CFLAGS)
#	    AX_CFLAGS_GCC_OPTION(-Wextra, DEVELOPER_CFLAGS)
#	    AX_CFLAGS_GCC_OPTION(-Wc++-compat, DEVELOPER_CFLAGS)
#	    AX_CFLAGS_GCC_OPTION(-Wmissing-prototypes, DEVELOPER_CFLAGS)
#	    AX_CFLAGS_GCC_OPTION(-Wmissing-declarations, DEVELOPER_CFLAGS)
#	    AX_CFLAGS_GCC_OPTION(-Wmissing-field-initializers, DEVELOPER_CFLAGS)
	    #
	    # warnings we don't want...
	    #
	    AX_CFLAGS_GCC_OPTION(-Wno-format-y2k, DEVELOPER_CFLAGS)
	    AX_CFLAGS_GCC_OPTION(-Wno-unused-parameter, DEVELOPER_CFLAGS)
	else
	    AX_CFLAGS_IRIX_OPTION(-fullwarn, DEVELOPER_CFLAGS)
	fi

    	CFLAGS="${OLD_CFLAGS}"
fi
if test -n "$DEVELOPER_CFLAGS"; then
	OLD_CFLAGS="${CFLAGS}"
	CFLAGS="${CFLAGS} ${DEVELOPER_CFLAGS}"
	AC_MSG_CHECKING([that the C compiler can use the DEVELOPER_CFLAGS])
	AC_TRY_COMPILE([],[],
		AC_MSG_RESULT(yes),
		DEVELOPER_CFLAGS=""; AC_MSG_RESULT(no))
	CFLAGS="${OLD_CFLAGS}"
fi

# allow for --with-hostcc=gcc
AC_ARG_WITH(hostcc,[  --with-hostcc=compiler    choose host compiler],
[HOSTCC=$withval],
[
if test z"$cross_compiling" = "yes"; then 
	HOSTCC=cc
else 
	HOSTCC=$CC
fi
])
AC_SUBST(HOSTCC)

AC_PATH_PROG(GCOV,gcov)

AC_PATH_PROG(MAKE,make)

AC_CACHE_CHECK([whether we have GNU make], samba_cv_gnu_make, [
if $ac_cv_path_MAKE --version | head -1 | grep GNU 2>/dev/null >/dev/null
then
	samba_cv_gnu_make=yes
else
	samba_cv_gnu_make=no
fi
])

GNU_MAKE=$samba_cv_gnu_make
AC_SUBST(GNU_MAKE)

if test "x$GNU_MAKE" = x"yes"; then
	AC_CACHE_CHECK([GNU make version], samba_cv_gnu_make_version,[
		samba_cv_gnu_make_version=`$ac_cv_path_MAKE --version | head -1 | cut -d " " -f 3 2>/dev/null`
	])
	GNU_MAKE_VERSION=$samba_cv_gnu_make_version
	AC_SUBST(GNU_MAKE_VERSION)
fi


new_make=no
AC_MSG_CHECKING([for GNU make >= 3.81])
if test x$GNU_MAKE = x"yes"; then
	if $PERL -e " \$_ = '$GNU_MAKE_VERSION'; s/@<:@^\d\.@:>@.*//g; exit (\$_ < 3.81);"; then
		new_make=yes
	fi
fi
AC_MSG_RESULT($new_make)
automatic_dependencies=no
AX_CFLAGS_GCC_OPTION([-M -MT conftest.d -MF conftest.o], [], [ automatic_dependencies=$new_make ], [])
AC_MSG_CHECKING([Whether to use automatic dependencies])
AC_MSG_RESULT($automatic_dependencies)
AC_SUBST(automatic_dependencies)