1 dnl Check whether target compiler is working
2 AC_DEFUN(grub_PROG_TARGET_CC,
3 [AC_MSG_CHECKING([whether target compiler is working])
4 AC_CACHE_VAL(grub_cv_prog_target_cc,
5 [AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
6 [grub_cv_prog_target_cc=yes],
7 [grub_cv_prog_target_cc=no])
9 AC_MSG_RESULT([$grub_cv_prog_target_cc])
11 if test "x$grub_cv_prog_target_cc" = xno; then
12 AC_MSG_ERROR([cannot compile for the target])
17 dnl grub_ASM_USCORE checks if C symbols get an underscore after
18 dnl compiling to assembler.
19 dnl Written by Pavel Roskin. Based on grub_ASM_EXT_C written by
20 dnl Erich Boleyn and modified by Yoshinori K. Okuji.
21 AC_DEFUN(grub_ASM_USCORE,
22 [AC_REQUIRE([AC_PROG_CC])
23 AC_MSG_CHECKING([if C symbols get an underscore after compilation])
24 AC_CACHE_VAL(grub_cv_asm_uscore,
25 [cat > conftest.c <<\EOF
34 if AC_TRY_COMMAND([${CC-cc} ${CFLAGS} -S conftest.c]) && test -s conftest.s; then
37 AC_MSG_ERROR([${CC-cc} failed to produce assembly code])
40 if grep _func conftest.s >/dev/null 2>&1; then
41 grub_cv_asm_uscore=yes
48 if test "x$grub_cv_asm_uscore" = xyes; then
49 AC_DEFINE_UNQUOTED([HAVE_ASM_USCORE], $grub_cv_asm_uscore,
50 [Define if C symbols get an underscore after compilation])
53 AC_MSG_RESULT([$grub_cv_asm_uscore])
57 dnl Some versions of `objcopy -O binary' vary their output depending
58 dnl on the link address.
59 AC_DEFUN(grub_PROG_OBJCOPY_ABSOLUTE,
60 [AC_MSG_CHECKING([whether ${OBJCOPY} works for absolute addresses])
61 AC_CACHE_VAL(grub_cv_prog_objcopy_absolute,
62 [cat > conftest.c <<\EOF
66 *((int *) 0x1000) = 2;
70 if AC_TRY_EVAL(ac_compile) && test -s conftest.o; then :
72 AC_MSG_ERROR([${CC-cc} cannot compile C source code])
74 grub_cv_prog_objcopy_absolute=yes
75 for link_addr in 2000 8000 7C00; do
76 if AC_TRY_COMMAND([${CC-cc} ${CFLAGS} -nostdlib ${TARGET_IMG_LDFLAGS_AC} -Wl,-Ttext -Wl,$link_addr conftest.o -o conftest.exec]); then :
78 AC_MSG_ERROR([${CC-cc} cannot link at address $link_addr])
80 if AC_TRY_COMMAND([${OBJCOPY-objcopy} --only-section=.text -O binary conftest.exec conftest]); then :
82 AC_MSG_ERROR([${OBJCOPY-objcopy} cannot create binary files])
84 if test ! -f conftest.old || AC_TRY_COMMAND([cmp -s conftest.old conftest]); then
85 mv -f conftest conftest.old
87 grub_cv_prog_objcopy_absolute=no
92 AC_MSG_RESULT([$grub_cv_prog_objcopy_absolute])
94 if test "x$grub_cv_prog_objcopy_absolute" = xno; then
95 AC_MSG_ERROR([GRUB requires a working absolute objcopy; upgrade your binutils])
100 dnl Supply --build-id=none to ld if building modules.
101 dnl This suppresses warnings from ld on some systems
102 AC_DEFUN(grub_PROG_LD_BUILD_ID_NONE,
103 [AC_MSG_CHECKING([whether linker accepts --build-id=none])
104 AC_CACHE_VAL(grub_cv_prog_ld_build_id_none,
105 [save_LDFLAGS="$LDFLAGS"
106 LDFLAGS="$LDFLAGS -Wl,--build-id=none"
107 AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
108 [grub_cv_prog_ld_build_id_none=yes],
109 [grub_cv_prog_ld_build_id_none=no])
110 LDFLAGS="$save_LDFLAGS"
112 AC_MSG_RESULT([$grub_cv_prog_ld_build_id_none])
114 if test "x$grub_cv_prog_ld_build_id_none" = xyes; then
115 MODULE_LDFLAGS="$MODULE_LDFLAGS -Wl,--build-id=none"
121 dnl Older versions of GAS interpret `.code16' to mean ``generate 32-bit
122 dnl instructions, but implicitly insert addr32 and data32 bytes so
123 dnl that the code works in real mode''.
125 dnl Newer versions of GAS interpret `.code16' to mean ``generate 16-bit
126 dnl instructions,'' which seems right. This requires the programmer
127 dnl to explicitly insert addr32 and data32 instructions when they want
130 dnl We only support the newer versions, because the old versions cause
131 dnl major pain, by requiring manual assembly to get 16-bit instructions into
133 AC_DEFUN(grub_I386_ASM_ADDR32,
134 [AC_REQUIRE([AC_PROG_CC])
135 AC_REQUIRE([grub_I386_ASM_PREFIX_REQUIREMENT])
136 AC_MSG_CHECKING([for .code16 addr32 assembler support])
137 AC_CACHE_VAL(grub_cv_i386_asm_addr32,
138 [cat > conftest.s.in <<\EOF
140 l1: @ADDR32@ movb %al, l1
143 if test "x$grub_cv_i386_asm_prefix_requirement" = xyes; then
144 sed -e s/@ADDR32@/addr32/ < conftest.s.in > conftest.s
146 sed -e s/@ADDR32@/addr32\;/ < conftest.s.in > conftest.s
149 if AC_TRY_COMMAND([${CC-cc} ${CFLAGS} -c conftest.s]) && test -s conftest.o; then
150 grub_cv_i386_asm_addr32=yes
152 grub_cv_i386_asm_addr32=no
157 AC_MSG_RESULT([$grub_cv_i386_asm_addr32])])
160 dnl Later versions of GAS requires that addr32 and data32 prefixes
161 dnl appear in the same lines as the instructions they modify, while
162 dnl earlier versions requires that they appear in separate lines.
163 AC_DEFUN(grub_I386_ASM_PREFIX_REQUIREMENT,
164 [AC_REQUIRE([AC_PROG_CC])
166 [whether addr32 must be in the same line as the instruction])
167 AC_CACHE_VAL(grub_cv_i386_asm_prefix_requirement,
168 [cat > conftest.s <<\EOF
170 l1: addr32 movb %al, l1
173 if AC_TRY_COMMAND([${CC-cc} ${CFLAGS} -c conftest.s]) && test -s conftest.o; then
174 grub_cv_i386_asm_prefix_requirement=yes
176 grub_cv_i386_asm_prefix_requirement=no
181 if test "x$grub_cv_i386_asm_prefix_requirement" = xyes; then
182 grub_tmp_addr32="addr32"
183 grub_tmp_data32="data32"
185 grub_tmp_addr32="addr32;"
186 grub_tmp_data32="data32;"
189 AC_DEFINE_UNQUOTED([ADDR32], $grub_tmp_addr32,
190 [Define it to \"addr32\" or \"addr32;\" to make GAS happy])
191 AC_DEFINE_UNQUOTED([DATA32], $grub_tmp_data32,
192 [Define it to \"data32\" or \"data32;\" to make GAS happy])
194 AC_MSG_RESULT([$grub_cv_i386_asm_prefix_requirement])])
197 dnl Older versions of GAS require that absolute indirect calls/jumps are
198 dnl not prefixed with `*', while later versions warn if not prefixed.
199 AC_DEFUN(grub_I386_ASM_ABSOLUTE_WITHOUT_ASTERISK,
200 [AC_REQUIRE([AC_PROG_CC])
202 [whether an absolute indirect call/jump must not be prefixed with an asterisk])
203 AC_CACHE_VAL(grub_cv_i386_asm_absolute_without_asterisk,
204 [cat > conftest.s <<\EOF
211 if AC_TRY_COMMAND([${CC-cc} ${CFLAGS} -c conftest.s]) && test -s conftest.o; then
212 grub_cv_i386_asm_absolute_without_asterisk=no
214 grub_cv_i386_asm_absolute_without_asterisk=yes
219 if test "x$grub_cv_i386_asm_absolute_without_asterisk" = xyes; then
220 AC_DEFINE([ABSOLUTE_WITHOUT_ASTERISK], 1,
221 [Define it if GAS requires that absolute indirect calls/jumps are not prefixed with an asterisk])
224 AC_MSG_RESULT([$grub_cv_i386_asm_absolute_without_asterisk])])
227 dnl Check what symbol is defined as a start symbol.
228 dnl Written by Yoshinori K. Okuji.
229 AC_DEFUN(grub_CHECK_START_SYMBOL,
230 [AC_REQUIRE([AC_PROG_CC])
231 AC_MSG_CHECKING([if start is defined by the compiler])
232 AC_CACHE_VAL(grub_cv_check_start_symbol,
233 [AC_LINK_IFELSE([AC_LANG_PROGRAM([[]],
234 [[asm ("incl start")]])],
235 [grub_cv_check_start_symbol=yes],
236 [grub_cv_check_start_symbol=no])])
238 AC_MSG_RESULT([$grub_cv_check_start_symbol])
240 AC_MSG_CHECKING([if _start is defined by the compiler])
241 AC_CACHE_VAL(grub_cv_check_uscore_start_symbol,
242 [AC_LINK_IFELSE([AC_LANG_PROGRAM([[]],
243 [[asm ("incl _start")]])],
244 [grub_cv_check_uscore_start_symbol=yes],
245 [grub_cv_check_uscore_start_symbol=no])])
247 AC_MSG_RESULT([$grub_cv_check_uscore_start_symbol])
249 AH_TEMPLATE([START_SYMBOL], [Define it to either start or _start])
251 if test "x$grub_cv_check_start_symbol" = xyes; then
252 AC_DEFINE([START_SYMBOL], [start])
253 elif test "x$grub_cv_check_uscore_start_symbol" = xyes; then
254 AC_DEFINE([START_SYMBOL], [_start])
256 AC_MSG_ERROR([neither start nor _start is defined])
260 dnl Check what symbol is defined as a bss start symbol.
261 dnl Written by Michael Hohmoth and Yoshinori K. Okuji.
262 AC_DEFUN(grub_CHECK_BSS_START_SYMBOL,
263 [AC_REQUIRE([AC_PROG_CC])
264 AC_MSG_CHECKING([if __bss_start is defined by the compiler])
265 AC_CACHE_VAL(grub_cv_check_uscore_uscore_bss_start_symbol,
266 [AC_LINK_IFELSE([AC_LANG_PROGRAM([[]],
267 [[asm ("incl __bss_start")]])],
268 [grub_cv_check_uscore_uscore_bss_start_symbol=yes],
269 [grub_cv_check_uscore_uscore_bss_start_symbol=no])])
271 AC_MSG_RESULT([$grub_cv_check_uscore_uscore_bss_start_symbol])
273 AC_MSG_CHECKING([if edata is defined by the compiler])
274 AC_CACHE_VAL(grub_cv_check_edata_symbol,
275 [AC_LINK_IFELSE([AC_LANG_PROGRAM([[]],
276 [[asm ("incl edata")]])],
277 [grub_cv_check_edata_symbol=yes],
278 [grub_cv_check_edata_symbol=no])])
280 AC_MSG_RESULT([$grub_cv_check_edata_symbol])
282 AC_MSG_CHECKING([if _edata is defined by the compiler])
283 AC_CACHE_VAL(grub_cv_check_uscore_edata_symbol,
284 [AC_LINK_IFELSE([AC_LANG_PROGRAM([[]],
285 [[asm ("incl _edata")]])],
286 [grub_cv_check_uscore_edata_symbol=yes],
287 [grub_cv_check_uscore_edata_symbol=no])])
289 AC_MSG_RESULT([$grub_cv_check_uscore_edata_symbol])
291 AH_TEMPLATE([BSS_START_SYMBOL], [Define it to one of __bss_start, edata and _edata])
293 if test "x$grub_cv_check_uscore_uscore_bss_start_symbol" = xyes; then
294 AC_DEFINE([BSS_START_SYMBOL], [__bss_start])
295 elif test "x$grub_cv_check_edata_symbol" = xyes; then
296 AC_DEFINE([BSS_START_SYMBOL], [edata])
297 elif test "x$grub_cv_check_uscore_edata_symbol" = xyes; then
298 AC_DEFINE([BSS_START_SYMBOL], [_edata])
300 AC_MSG_ERROR([none of __bss_start, edata or _edata is defined])
304 dnl Check what symbol is defined as an end symbol.
305 dnl Written by Yoshinori K. Okuji.
306 AC_DEFUN(grub_CHECK_END_SYMBOL,
307 [AC_REQUIRE([AC_PROG_CC])
308 AC_MSG_CHECKING([if end is defined by the compiler])
309 AC_CACHE_VAL(grub_cv_check_end_symbol,
310 [AC_LINK_IFELSE([AC_LANG_PROGRAM([[]],
311 [[asm ("incl end")]])],
312 [grub_cv_check_end_symbol=yes],
313 [grub_cv_check_end_symbol=no])])
315 AC_MSG_RESULT([$grub_cv_check_end_symbol])
317 AC_MSG_CHECKING([if _end is defined by the compiler])
318 AC_CACHE_VAL(grub_cv_check_uscore_end_symbol,
319 [AC_LINK_IFELSE([AC_LANG_PROGRAM([[]],
320 [[asm ("incl _end")]])],
321 [grub_cv_check_uscore_end_symbol=yes],
322 [grub_cv_check_uscore_end_symbol=no])])
324 AC_MSG_RESULT([$grub_cv_check_uscore_end_symbol])
326 AH_TEMPLATE([END_SYMBOL], [Define it to either end or _end])
328 if test "x$grub_cv_check_end_symbol" = xyes; then
329 AC_DEFINE([END_SYMBOL], [end])
330 elif test "x$grub_cv_check_uscore_end_symbol" = xyes; then
331 AC_DEFINE([END_SYMBOL], [_end])
333 AC_MSG_ERROR([neither end nor _end is defined])
337 dnl Check if the C compiler has a bug while using nested functions when
338 dnl mregparm is used on the i386. Some gcc versions do not pass the third
339 dnl parameter correctly to the nested function.
340 dnl Written by Marco Gerards.
341 AC_DEFUN(grub_I386_CHECK_REGPARM_BUG,
342 [AC_REQUIRE([AC_PROG_CC])
343 AC_MSG_CHECKING([if GCC has the regparm=3 bug])
344 AC_CACHE_VAL(grub_cv_i386_check_nested_functions,
345 [AC_RUN_IFELSE([AC_LANG_SOURCE(
354 testfunc (int __attribute__ ((__regparm__ (3))) (*hook) (int a, int b, int *c))
359 return hook (a, b, &c);
365 int __attribute__ ((__regparm__ (3))) nestedfunc (int a, int b, int *c)
367 return a == b && test (c);
369 return testfunc (nestedfunc) ? 0 : 1;
372 [grub_cv_i386_check_nested_functions=no],
373 [grub_cv_i386_check_nested_functions=yes])])
375 AC_MSG_RESULT([$grub_cv_i386_check_nested_functions])
377 if test "x$grub_cv_i386_check_nested_functions" = xyes; then
378 AC_DEFINE([NESTED_FUNC_ATTR],
379 [__attribute__ ((__regparm__ (1)))],
382 dnl Unfortunately, the above test does not detect a bug in gcc-4.0.
383 dnl So use regparm 2 until a better test is found.
384 AC_DEFINE([NESTED_FUNC_ATTR],
385 [__attribute__ ((__regparm__ (1)))],
390 dnl Check if the C compiler generates calls to `__enable_execute_stack()'.
391 AC_DEFUN(grub_CHECK_ENABLE_EXECUTE_STACK,[
392 AC_MSG_CHECKING([whether `$CC' generates calls to `__enable_execute_stack()'])
394 void f (int (*p) (void));
397 int nestedfunc (void) { return i; }
401 if AC_TRY_COMMAND([${CC-cc} ${CFLAGS} -S conftest.c]) && test -s conftest.s; then
404 AC_MSG_ERROR([${CC-cc} failed to produce assembly code])
406 if grep __enable_execute_stack conftest.s >/dev/null 2>&1; then
407 AC_DEFINE([NEED_ENABLE_EXECUTE_STACK], 1,
408 [Define to 1 if GCC generates calls to __enable_execute_stack()])
417 dnl Check if the C compiler supports `-fstack-protector'.
418 AC_DEFUN(grub_CHECK_STACK_PROTECTOR,[
419 [# Smashing stack protector.
421 AC_MSG_CHECKING([whether `$CC' accepts `-fstack-protector'])
422 # Is this a reliable test case?
423 AC_LANG_CONFTEST([[void foo (void) { volatile char a[8]; a[3]; }]])
424 [# `$CC -c -o ...' might not be portable. But, oh, well... Is calling
425 # `ac_compile' like this correct, after all?
426 if eval "$ac_compile -S -fstack-protector -o conftest.s" 2> /dev/null; then]
428 [# Should we clear up other files as well, having called `AC_LANG_CONFTEST'?
436 dnl Check if the C compiler supports `-mstack-arg-probe' (Cygwin).
437 AC_DEFUN(grub_CHECK_STACK_ARG_PROBE,[
438 [# Smashing stack arg probe.
440 AC_MSG_CHECKING([whether `$CC' accepts `-mstack-arg-probe'])
441 AC_LANG_CONFTEST([[void foo (void) { volatile char a[8]; a[3]; }]])
442 [if eval "$ac_compile -S -mstack-arg-probe -o conftest.s" 2> /dev/null; then]
444 [# Should we clear up other files as well, having called `AC_LANG_CONFTEST'?