| dnl Redefine AC_LANG_PROGRAM with a "-Wstrict-prototypes -Werror"-friendly |
| dnl version. Patch submitted to bug-autoconf in 2009-09-16. |
| m4_define([AC_LANG_PROGRAM(C)], |
| [$1 |
| int |
| main (void) |
| { |
| dnl Do *not* indent the following line: there may be CPP directives. |
| dnl Don't move the `;' right after for the same reason. |
| $2 |
| ; |
| return 0; |
| }]) |
| |
| |
| dnl Check whether target compiler is working |
| AC_DEFUN(grub_PROG_TARGET_CC, |
| [AC_MSG_CHECKING([whether target compiler is working]) |
| AC_CACHE_VAL(grub_cv_prog_target_cc, |
| [AC_LINK_IFELSE([AC_LANG_PROGRAM([[ |
| asm (".globl start; start: nop"); |
| int main (void); |
| ]], [[]])], |
| [grub_cv_prog_target_cc=yes], |
| [grub_cv_prog_target_cc=no]) |
| ]) |
| AC_MSG_RESULT([$grub_cv_prog_target_cc]) |
| |
| if test "x$grub_cv_prog_target_cc" = xno; then |
| AC_MSG_ERROR([cannot compile for the target]) |
| fi |
| ]) |
| |
| |
| dnl grub_ASM_USCORE checks if C symbols get an underscore after |
| dnl compiling to assembler. |
| dnl Written by Pavel Roskin. Based on grub_ASM_EXT_C written by |
| dnl Erich Boleyn and modified by Yoshinori K. Okuji. |
| AC_DEFUN(grub_ASM_USCORE, |
| [AC_REQUIRE([AC_PROG_CC]) |
| AC_MSG_CHECKING([if C symbols get an underscore after compilation]) |
| AC_CACHE_VAL(grub_cv_asm_uscore, |
| [cat > conftest.c <<\EOF |
| int func (int *); |
| int |
| func (int *list) |
| { |
| *list = 0; |
| return *list; |
| } |
| EOF |
| |
| if AC_TRY_COMMAND([${CC-cc} ${CFLAGS} -S conftest.c]) && test -s conftest.s; then |
| true |
| else |
| AC_MSG_ERROR([${CC-cc} failed to produce assembly code]) |
| fi |
| |
| if grep _func conftest.s >/dev/null 2>&1; then |
| grub_cv_asm_uscore=yes |
| else |
| grub_cv_asm_uscore=no |
| fi |
| |
| rm -f conftest*]) |
| |
| if test "x$grub_cv_asm_uscore" = xyes; then |
| AC_DEFINE_UNQUOTED([HAVE_ASM_USCORE], $grub_cv_asm_uscore, |
| [Define if C symbols get an underscore after compilation]) |
| fi |
| |
| AC_MSG_RESULT([$grub_cv_asm_uscore]) |
| ]) |
| |
| |
| dnl Some versions of `objcopy -O binary' vary their output depending |
| dnl on the link address. |
| AC_DEFUN(grub_PROG_OBJCOPY_ABSOLUTE, |
| [AC_MSG_CHECKING([whether ${OBJCOPY} works for absolute addresses]) |
| AC_CACHE_VAL(grub_cv_prog_objcopy_absolute, |
| [cat > conftest.c <<\EOF |
| void cmain (void); |
| void |
| cmain (void) |
| { |
| *((int *) 0x1000) = 2; |
| } |
| EOF |
| |
| if AC_TRY_EVAL(ac_compile) && test -s conftest.o; then : |
| else |
| AC_MSG_ERROR([${CC-cc} cannot compile C source code]) |
| fi |
| grub_cv_prog_objcopy_absolute=yes |
| for link_addr in 2000 8000 7C00; do |
| if AC_TRY_COMMAND([${CC-cc} ${CFLAGS} -nostdlib ${TARGET_IMG_LDFLAGS_AC} -Wl,-Ttext -Wl,$link_addr conftest.o -o conftest.exec]); then : |
| else |
| AC_MSG_ERROR([${CC-cc} cannot link at address $link_addr]) |
| fi |
| if AC_TRY_COMMAND([${OBJCOPY-objcopy} --only-section=.text -O binary conftest.exec conftest]); then : |
| else |
| AC_MSG_ERROR([${OBJCOPY-objcopy} cannot create binary files]) |
| fi |
| if test ! -f conftest.old || AC_TRY_COMMAND([cmp -s conftest.old conftest]); then |
| mv -f conftest conftest.old |
| else |
| grub_cv_prog_objcopy_absolute=no |
| break |
| fi |
| done |
| rm -f conftest*]) |
| AC_MSG_RESULT([$grub_cv_prog_objcopy_absolute]) |
| |
| if test "x$grub_cv_prog_objcopy_absolute" = xno; then |
| AC_MSG_ERROR([GRUB requires a working absolute objcopy; upgrade your binutils]) |
| fi |
| ]) |
| |
| |
| dnl Supply --build-id=none to ld if building modules. |
| dnl This suppresses warnings from ld on some systems |
| AC_DEFUN(grub_PROG_LD_BUILD_ID_NONE, |
| [AC_MSG_CHECKING([whether linker accepts --build-id=none]) |
| AC_CACHE_VAL(grub_cv_prog_ld_build_id_none, |
| [save_LDFLAGS="$LDFLAGS" |
| LDFLAGS="$LDFLAGS -Wl,--build-id=none" |
| AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], [[]])], |
| [grub_cv_prog_ld_build_id_none=yes], |
| [grub_cv_prog_ld_build_id_none=no]) |
| LDFLAGS="$save_LDFLAGS" |
| ]) |
| AC_MSG_RESULT([$grub_cv_prog_ld_build_id_none]) |
| |
| if test "x$grub_cv_prog_ld_build_id_none" = xyes; then |
| TARGET_LDFLAGS="$TARGET_LDFLAGS -Wl,--build-id=none" |
| fi |
| ]) |
| |
| |
| dnl Mass confusion! |
| dnl Older versions of GAS interpret `.code16' to mean ``generate 32-bit |
| dnl instructions, but implicitly insert addr32 and data32 bytes so |
| dnl that the code works in real mode''. |
| dnl |
| dnl Newer versions of GAS interpret `.code16' to mean ``generate 16-bit |
| dnl instructions,'' which seems right. This requires the programmer |
| dnl to explicitly insert addr32 and data32 instructions when they want |
| dnl them. |
| dnl |
| dnl We only support the newer versions, because the old versions cause |
| dnl major pain, by requiring manual assembly to get 16-bit instructions into |
| dnl asm files. |
| AC_DEFUN(grub_I386_ASM_ADDR32, |
| [AC_REQUIRE([AC_PROG_CC]) |
| AC_REQUIRE([grub_I386_ASM_PREFIX_REQUIREMENT]) |
| AC_MSG_CHECKING([for .code16 addr32 assembler support]) |
| AC_CACHE_VAL(grub_cv_i386_asm_addr32, |
| [cat > conftest.s.in <<\EOF |
| .code16 |
| l1: @ADDR32@ movb %al, l1 |
| EOF |
| |
| if test "x$grub_cv_i386_asm_prefix_requirement" = xyes; then |
| sed -e s/@ADDR32@/addr32/ < conftest.s.in > conftest.s |
| else |
| sed -e s/@ADDR32@/addr32\;/ < conftest.s.in > conftest.s |
| fi |
| |
| if AC_TRY_COMMAND([${CC-cc} ${CFLAGS} -c conftest.s]) && test -s conftest.o; then |
| grub_cv_i386_asm_addr32=yes |
| else |
| grub_cv_i386_asm_addr32=no |
| fi |
| |
| rm -f conftest*]) |
| |
| AC_MSG_RESULT([$grub_cv_i386_asm_addr32])]) |
| |
| dnl check if our compiler is apple cc |
| dnl because it requires numerous workarounds |
| AC_DEFUN(grub_apple_cc, |
| [AC_REQUIRE([AC_PROG_CC]) |
| AC_MSG_CHECKING([whether our compiler is apple cc]) |
| AC_CACHE_VAL(grub_cv_apple_cc, |
| [if $CC -v 2>&1 | grep "Apple Inc." > /dev/null; then |
| grub_cv_apple_cc=yes |
| else |
| grub_cv_apple_cc=no |
| fi |
| ]) |
| |
| AC_MSG_RESULT([$grub_cv_apple_cc])]) |
| |
| dnl check if our target compiler is apple cc |
| dnl because it requires numerous workarounds |
| AC_DEFUN(grub_apple_target_cc, |
| [AC_REQUIRE([AC_PROG_CC]) |
| AC_MSG_CHECKING([whether our target compiler is apple cc]) |
| AC_CACHE_VAL(grub_cv_apple_target_cc, |
| [if $CC -v 2>&1 | grep "Apple Inc." > /dev/null; then |
| grub_cv_apple_target_cc=yes |
| else |
| grub_cv_apple_target_cc=no |
| fi |
| ]) |
| |
| AC_MSG_RESULT([$grub_cv_apple_target_cc])]) |
| |
| |
| dnl Later versions of GAS requires that addr32 and data32 prefixes |
| dnl appear in the same lines as the instructions they modify, while |
| dnl earlier versions requires that they appear in separate lines. |
| AC_DEFUN(grub_I386_ASM_PREFIX_REQUIREMENT, |
| [AC_REQUIRE([AC_PROG_CC]) |
| AC_MSG_CHECKING(dnl |
| [whether addr32 must be in the same line as the instruction]) |
| AC_CACHE_VAL(grub_cv_i386_asm_prefix_requirement, |
| [cat > conftest.s <<\EOF |
| .code16 |
| l1: addr32 movb %al, l1 |
| EOF |
| |
| if AC_TRY_COMMAND([${CC-cc} ${CFLAGS} -c conftest.s]) && test -s conftest.o; then |
| grub_cv_i386_asm_prefix_requirement=yes |
| else |
| grub_cv_i386_asm_prefix_requirement=no |
| fi |
| |
| rm -f conftest*]) |
| |
| if test "x$grub_cv_i386_asm_prefix_requirement" = xyes; then |
| grub_tmp_addr32="addr32" |
| grub_tmp_data32="data32" |
| else |
| grub_tmp_addr32="addr32;" |
| grub_tmp_data32="data32;" |
| fi |
| |
| AC_DEFINE_UNQUOTED([ADDR32], $grub_tmp_addr32, |
| [Define it to \"addr32\" or \"addr32;\" to make GAS happy]) |
| AC_DEFINE_UNQUOTED([DATA32], $grub_tmp_data32, |
| [Define it to \"data32\" or \"data32;\" to make GAS happy]) |
| |
| AC_MSG_RESULT([$grub_cv_i386_asm_prefix_requirement])]) |
| |
| |
| dnl Older versions of GAS require that absolute indirect calls/jumps are |
| dnl not prefixed with `*', while later versions warn if not prefixed. |
| AC_DEFUN(grub_I386_ASM_ABSOLUTE_WITHOUT_ASTERISK, |
| [AC_REQUIRE([AC_PROG_CC]) |
| AC_MSG_CHECKING(dnl |
| [whether an absolute indirect call/jump must not be prefixed with an asterisk]) |
| AC_CACHE_VAL(grub_cv_i386_asm_absolute_without_asterisk, |
| [cat > conftest.s <<\EOF |
| lcall *(offset) |
| offset: |
| .long 0 |
| .word 0 |
| EOF |
| |
| if AC_TRY_COMMAND([${CC-cc} ${CFLAGS} -c conftest.s]) && test -s conftest.o; then |
| grub_cv_i386_asm_absolute_without_asterisk=no |
| else |
| grub_cv_i386_asm_absolute_without_asterisk=yes |
| fi |
| |
| rm -f conftest*]) |
| |
| if test "x$grub_cv_i386_asm_absolute_without_asterisk" = xyes; then |
| AC_DEFINE([ABSOLUTE_WITHOUT_ASTERISK], 1, |
| [Define it if GAS requires that absolute indirect calls/jumps are not prefixed with an asterisk]) |
| fi |
| |
| AC_MSG_RESULT([$grub_cv_i386_asm_absolute_without_asterisk])]) |
| |
| |
| dnl Check what symbol is defined as a bss start symbol. |
| dnl Written by Michael Hohmoth and Yoshinori K. Okuji. |
| AC_DEFUN(grub_CHECK_BSS_START_SYMBOL, |
| [AC_REQUIRE([AC_PROG_CC]) |
| AC_MSG_CHECKING([if __bss_start is defined by the compiler]) |
| AC_CACHE_VAL(grub_cv_check_uscore_uscore_bss_start_symbol, |
| [AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], |
| [[asm ("incl __bss_start")]])], |
| [grub_cv_check_uscore_uscore_bss_start_symbol=yes], |
| [grub_cv_check_uscore_uscore_bss_start_symbol=no])]) |
| |
| AC_MSG_RESULT([$grub_cv_check_uscore_uscore_bss_start_symbol]) |
| |
| AC_MSG_CHECKING([if edata is defined by the compiler]) |
| AC_CACHE_VAL(grub_cv_check_edata_symbol, |
| [AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], |
| [[asm ("incl edata")]])], |
| [grub_cv_check_edata_symbol=yes], |
| [grub_cv_check_edata_symbol=no])]) |
| |
| AC_MSG_RESULT([$grub_cv_check_edata_symbol]) |
| |
| AC_MSG_CHECKING([if _edata is defined by the compiler]) |
| AC_CACHE_VAL(grub_cv_check_uscore_edata_symbol, |
| [AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], |
| [[asm ("incl _edata")]])], |
| [grub_cv_check_uscore_edata_symbol=yes], |
| [grub_cv_check_uscore_edata_symbol=no])]) |
| |
| AC_MSG_RESULT([$grub_cv_check_uscore_edata_symbol]) |
| |
| AH_TEMPLATE([BSS_START_SYMBOL], [Define it to one of __bss_start, edata and _edata]) |
| |
| if test "x$grub_cv_check_uscore_uscore_bss_start_symbol" = xyes; then |
| AC_DEFINE([BSS_START_SYMBOL], [__bss_start]) |
| elif test "x$grub_cv_check_edata_symbol" = xyes; then |
| AC_DEFINE([BSS_START_SYMBOL], [edata]) |
| elif test "x$grub_cv_check_uscore_edata_symbol" = xyes; then |
| AC_DEFINE([BSS_START_SYMBOL], [_edata]) |
| else |
| AC_MSG_ERROR([none of __bss_start, edata or _edata is defined]) |
| fi |
| ]) |
| |
| dnl Check what symbol is defined as an end symbol. |
| dnl Written by Yoshinori K. Okuji. |
| AC_DEFUN(grub_CHECK_END_SYMBOL, |
| [AC_REQUIRE([AC_PROG_CC]) |
| AC_MSG_CHECKING([if end is defined by the compiler]) |
| AC_CACHE_VAL(grub_cv_check_end_symbol, |
| [AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], |
| [[asm ("incl end")]])], |
| [grub_cv_check_end_symbol=yes], |
| [grub_cv_check_end_symbol=no])]) |
| |
| AC_MSG_RESULT([$grub_cv_check_end_symbol]) |
| |
| AC_MSG_CHECKING([if _end is defined by the compiler]) |
| AC_CACHE_VAL(grub_cv_check_uscore_end_symbol, |
| [AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], |
| [[asm ("incl _end")]])], |
| [grub_cv_check_uscore_end_symbol=yes], |
| [grub_cv_check_uscore_end_symbol=no])]) |
| |
| AC_MSG_RESULT([$grub_cv_check_uscore_end_symbol]) |
| |
| AH_TEMPLATE([END_SYMBOL], [Define it to either end or _end]) |
| |
| if test "x$grub_cv_check_end_symbol" = xyes; then |
| AC_DEFINE([END_SYMBOL], [end]) |
| elif test "x$grub_cv_check_uscore_end_symbol" = xyes; then |
| AC_DEFINE([END_SYMBOL], [_end]) |
| else |
| AC_MSG_ERROR([neither end nor _end is defined]) |
| fi |
| ]) |
| |
| dnl Check if the C compiler generates calls to `__enable_execute_stack()'. |
| AC_DEFUN(grub_CHECK_ENABLE_EXECUTE_STACK,[ |
| AC_MSG_CHECKING([whether `$CC' generates calls to `__enable_execute_stack()']) |
| AC_LANG_CONFTEST([[ |
| void f (int (*p) (void)); |
| void g (int i) |
| { |
| int nestedfunc (void) { return i; } |
| f (nestedfunc); |
| } |
| ]]) |
| if AC_TRY_COMMAND([${CC-cc} ${CFLAGS} -S conftest.c]) && test -s conftest.s; then |
| true |
| else |
| AC_MSG_ERROR([${CC-cc} failed to produce assembly code]) |
| fi |
| if grep __enable_execute_stack conftest.s >/dev/null 2>&1; then |
| AC_DEFINE([NEED_ENABLE_EXECUTE_STACK], 1, |
| [Define to 1 if GCC generates calls to __enable_execute_stack()]) |
| AC_MSG_RESULT([yes]) |
| else |
| AC_MSG_RESULT([no]) |
| fi |
| rm -f conftest* |
| ]) |
| |
| |
| dnl Check if the C compiler supports `-fstack-protector'. |
| AC_DEFUN(grub_CHECK_STACK_PROTECTOR,[ |
| [# Smashing stack protector. |
| ssp_possible=yes] |
| AC_MSG_CHECKING([whether `$CC' accepts `-fstack-protector']) |
| # Is this a reliable test case? |
| AC_LANG_CONFTEST([[void foo (void) { volatile char a[8]; a[3]; }]]) |
| [# `$CC -c -o ...' might not be portable. But, oh, well... Is calling |
| # `ac_compile' like this correct, after all? |
| if eval "$ac_compile -S -fstack-protector -o conftest.s" 2> /dev/null; then] |
| AC_MSG_RESULT([yes]) |
| [# Should we clear up other files as well, having called `AC_LANG_CONFTEST'? |
| rm -f conftest.s |
| else |
| ssp_possible=no] |
| AC_MSG_RESULT([no]) |
| [fi] |
| ]) |
| |
| dnl Check if the C compiler supports `-mstack-arg-probe' (Cygwin). |
| AC_DEFUN(grub_CHECK_STACK_ARG_PROBE,[ |
| [# Smashing stack arg probe. |
| sap_possible=yes] |
| AC_MSG_CHECKING([whether `$CC' accepts `-mstack-arg-probe']) |
| AC_LANG_CONFTEST([[void foo (void) { volatile char a[8]; a[3]; }]]) |
| [if eval "$ac_compile -S -mstack-arg-probe -o conftest.s" 2> /dev/null; then] |
| AC_MSG_RESULT([yes]) |
| [# Should we clear up other files as well, having called `AC_LANG_CONFTEST'? |
| rm -f conftest.s |
| else |
| sap_possible=no] |
| AC_MSG_RESULT([no]) |
| [fi] |
| ]) |
| |
| dnl Check if ln can handle directories properly (mingw). |
| AC_DEFUN(grub_CHECK_LINK_DIR,[ |
| AC_MSG_CHECKING([whether ln can handle directories properly]) |
| [mkdir testdir 2>/dev/null |
| case $srcdir in |
| [\\/$]* | ?:[\\/]* ) reldir=$srcdir/include/grub/util ;; |
| *) reldir=../$srcdir/include/grub/util ;; |
| esac |
| if ln -s $reldir testdir/util 2>/dev/null ; then] |
| AC_MSG_RESULT([yes]) |
| [link_dir=yes |
| else |
| link_dir=no] |
| AC_MSG_RESULT([no]) |
| [fi |
| rm -rf testdir] |
| ]) |
| |
| dnl Check if the C compiler supports `-fPIE'. |
| AC_DEFUN(grub_CHECK_PIE,[ |
| [# Position independent executable. |
| pie_possible=yes] |
| AC_MSG_CHECKING([whether `$CC' has `-fPIE' as default]) |
| # Is this a reliable test case? |
| AC_LANG_CONFTEST([[ |
| #ifdef __PIE__ |
| int main() { |
| return 0; |
| } |
| #else |
| #error NO __PIE__ DEFINED |
| #endif |
| ]]) |
| |
| [# `$CC -c -o ...' might not be portable. But, oh, well... Is calling |
| # `ac_compile' like this correct, after all? |
| if eval "$ac_compile -S -o conftest.s" 2> /dev/null; then] |
| AC_MSG_RESULT([yes]) |
| [# Should we clear up other files as well, having called `AC_LANG_CONFTEST'? |
| rm -f conftest.s |
| else |
| pie_possible=no] |
| AC_MSG_RESULT([no]) |
| [fi] |
| ]) |