grub/acinclude.m4

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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.
$2
;
return 0;
}])
dnl Check whether target compiler is working
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AC_DEFUN([grub_PROG_TARGET_CC],
[AC_MSG_CHECKING([whether target compiler is working])
AC_CACHE_VAL(grub_cv_prog_target_cc,
[AC_LINK_IFELSE([AC_LANG_PROGRAM([[
asm (".globl start; start:");
int main (void);
]], [[]])],
[grub_cv_prog_target_cc=yes],
[grub_cv_prog_target_cc=no])
])
AC_MSG_RESULT([$grub_cv_prog_target_cc])
if test "x$grub_cv_prog_target_cc" = xno; then
AC_MSG_ERROR([cannot compile for the target])
fi
])
dnl grub_ASM_USCORE checks if C symbols get an underscore after
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dnl compiling to assembler.
dnl Written by Pavel Roskin. Based on grub_ASM_EXT_C written by
dnl Erich Boleyn and modified by Yoshinori K. Okuji.
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AC_DEFUN([grub_ASM_USCORE],
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[AC_REQUIRE([AC_PROG_CC])
AC_MSG_CHECKING([if C symbols get an underscore after compilation])
AC_CACHE_VAL(grub_cv_asm_uscore,
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[cat > conftest.c <<\EOF
int func (int *);
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int
func (int *list)
{
*list = 0;
return *list;
}
EOF
if AC_TRY_COMMAND([${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
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else
grub_cv_asm_uscore=no
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fi
rm -f conftest*])
if test "x$grub_cv_asm_uscore" = xyes; then
AC_DEFINE_UNQUOTED([HAVE_ASM_USCORE], $grub_cv_asm_uscore,
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[Define if C symbols get an underscore after compilation])
fi
AC_MSG_RESULT([$grub_cv_asm_uscore])
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])
dnl Some versions of `objcopy -O binary' vary their output depending
dnl on the link address.
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AC_DEFUN([grub_PROG_OBJCOPY_ABSOLUTE],
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[AC_MSG_CHECKING([whether ${OBJCOPY} works for absolute addresses])
AC_CACHE_VAL(grub_cv_prog_objcopy_absolute,
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[cat > conftest.c <<\EOF
void cmain (void);
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void
cmain (void)
{
*((int *) 0x1000) = 2;
}
EOF
if AC_TRY_EVAL(ac_compile) && test -s conftest.o; then :
else
AC_MSG_ERROR([${CC-cc} cannot compile C source code])
fi
grub_cv_prog_objcopy_absolute=yes
for link_addr in 0x2000 0x8000 0x7C00; do
2008-07-24 Bean <bean123ch@gmail.com> * common.rmk (bin_UTILITIES): Add grub-pe2elf. (grub_pe2elf_SOURCES): New macro. (CLEANFILES): Add grub-pe2elf. * include/grub/efi/pe32.h (GRUB_PE32_SCN_ALIGN_1BYTES): New constant. (GRUB_PE32_SCN_ALIGN_2BYTES): Likewise. (GRUB_PE32_SCN_ALIGN_4BYTES): Likewise. (GRUB_PE32_SCN_ALIGN_8BYTES): Likewise. (GRUB_PE32_SCN_ALIGN_16BYTES): Likewise. (GRUB_PE32_SCN_ALIGN_32BYTES): Likewise. (GRUB_PE32_SCN_ALIGN_64BYTES): Likewise. (GRUB_PE32_SCN_ALIGN_SHIFT): Likewise. (GRUB_PE32_SCN_ALIGN_MASK): Likewise. (GRUB_PE32_SYM_CLASS_EXTERNAL): Likewise. (GRUB_PE32_SYM_CLASS_STATIC): Likewise. (GRUB_PE32_SYM_CLASS_FILE): Likewise. (GRUB_PE32_DT_FUNCTION): Likewise. (GRUB_PE32_REL_I386_DIR32): Likewise. (GRUB_PE32_REL_I386_REL32): Likewise. (grub_pe32_symbol): New structure. (grub_pe32_reloc): Likewise. * util/grub-pe2elf.c: New file. * configure.ac: Set TARGET_OBJ2ELF if host os is cygwin. Don't test for start symbol in non pc platform. * genmk.rb: Use TARGET_OBJ2ELF to convert native object format to elf. The following patches are from Christian Franke. * include/grub/dl.h: Remove .previous, gas supports this only for ELF format. * include/grub/symbol.h [__CYGWIN__] (#define FUNCTION/VARIABLE): Remove .type, gas supports this only for ELF format. * kern/dl.c (grub_dl_resolve_dependencies): Add check for trailing nullbytes in symbol table. This fixes an infinite loop if table is zero filled. * Makefile.in: Add autoconf replacements TARGET_IMG_LDSCRIPT, TARGET_IMG_LDFLAGS and EXEEXT. * aclocal.m4 (grub_PROG_OBJCOPY_ABSOLUTE): Replace -Wl,-N by TARGET_IMG_LDFLAGS_AC. (grub_CHECK_STACK_ARG_PROBE): New function. * conf/i386-pc.rmk: Replace -Wl,-N by TARGET_IMG_LDFLAGS. * conf/i386-pc-cygwin-ld-img.sc: New linker script. * configure.ac: Add check for linker script "conf/${target}-img-ld.c" to set TARGET_IMG_LD* accordingly. Add check for Cygwin to set TARGET_MOD_OBJCOPY accordingly. Add call to grub_CHECK_STACK_ARG_PROBE. Use TARGET_IMG_LDFLAGS to check start, bss_start, end symbols. * genkernsyms.sh.in: Handle HAVE_ASM_USCORE case. * genmk.rb: Add EXEEXT to CLEANFILES.
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if AC_TRY_COMMAND([${CC-cc} ${CFLAGS} -nostdlib ${TARGET_IMG_LDFLAGS_AC} -Wl,-Ttext -Wl,$link_addr conftest.o -o conftest.exec]); then :
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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 :
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else
AC_MSG_ERROR([${OBJCOPY-objcopy} cannot create binary files])
fi
if test ! -f conftest.old || AC_TRY_COMMAND([cmp -s conftest.old conftest]); then
mv -f conftest conftest.old
else
grub_cv_prog_objcopy_absolute=no
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break
fi
done
rm -f conftest*])
AC_MSG_RESULT([$grub_cv_prog_objcopy_absolute])
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if test "x$grub_cv_prog_objcopy_absolute" = xno; then
AC_MSG_ERROR([GRUB requires a working absolute objcopy; upgrade your binutils])
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fi
])
dnl Supply --build-id=none to ld if building modules.
dnl This suppresses warnings from ld on some systems
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AC_DEFUN([grub_PROG_LD_BUILD_ID_NONE],
[AC_MSG_CHECKING([whether linker accepts --build-id=none])
AC_CACHE_VAL(grub_cv_prog_ld_build_id_none,
[save_LDFLAGS="$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="$TARGET_LDFLAGS -Wl,--build-id=none"
fi
])
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dnl Mass confusion!
dnl Older versions of GAS interpret `.code16' to mean ``generate 32-bit
dnl instructions, but implicitly insert addr32 and data32 bytes so
dnl that the code works in real mode''.
dnl
dnl Newer versions of GAS interpret `.code16' to mean ``generate 16-bit
dnl instructions,'' which seems right. This requires the programmer
dnl to explicitly insert addr32 and data32 instructions when they want
dnl them.
dnl
dnl We only support the newer versions, because the old versions cause
dnl major pain, by requiring manual assembly to get 16-bit instructions into
dnl asm files.
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AC_DEFUN([grub_I386_ASM_ADDR32],
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[AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([grub_I386_ASM_PREFIX_REQUIREMENT])
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AC_MSG_CHECKING([for .code16 addr32 assembler support])
AC_CACHE_VAL(grub_cv_i386_asm_addr32,
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[cat > conftest.s.in <<\EOF
.code16
l1: @ADDR32@ movb %al, l1
EOF
if test "x$grub_cv_i386_asm_prefix_requirement" = xyes; then
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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} ${CFLAGS} -c conftest.s]) && test -s conftest.o; then
grub_cv_i386_asm_addr32=yes
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else
grub_cv_i386_asm_addr32=no
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fi
rm -f conftest*])
AC_MSG_RESULT([$grub_cv_i386_asm_addr32])])
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dnl check if our compiler is apple cc
dnl because it requires numerous workarounds
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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
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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])])
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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.
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AC_DEFUN([grub_I386_ASM_PREFIX_REQUIREMENT],
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[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,
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[cat > conftest.s <<\EOF
.code16
l1: addr32 movb %al, l1
EOF
if AC_TRY_COMMAND([${CC-cc} ${CFLAGS} -c conftest.s]) && test -s conftest.o; then
grub_cv_i386_asm_prefix_requirement=yes
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else
grub_cv_i386_asm_prefix_requirement=no
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fi
rm -f conftest*])
if test "x$grub_cv_i386_asm_prefix_requirement" = xyes; then
grub_tmp_addr32="addr32"
grub_tmp_data32="data32"
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else
grub_tmp_addr32="addr32;"
grub_tmp_data32="data32;"
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fi
AC_DEFINE_UNQUOTED([ADDR32], $grub_tmp_addr32,
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[Define it to \"addr32\" or \"addr32;\" to make GAS happy])
AC_DEFINE_UNQUOTED([DATA32], $grub_tmp_data32,
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[Define it to \"data32\" or \"data32;\" to make GAS happy])
AC_MSG_RESULT([$grub_cv_i386_asm_prefix_requirement])])
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dnl Older versions of GAS require that absolute indirect calls/jumps are
dnl not prefixed with `*', while later versions warn if not prefixed.
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AC_DEFUN([grub_I386_ASM_ABSOLUTE_WITHOUT_ASTERISK],
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[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,
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[cat > conftest.s <<\EOF
2009-06-10 21:04:23 +00:00
lcall *(offset)
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offset:
.long 0
.word 0
EOF
if AC_TRY_COMMAND([${CC-cc} ${CFLAGS} -c conftest.s]) && test -s conftest.o; then
grub_cv_i386_asm_absolute_without_asterisk=no
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else
grub_cv_i386_asm_absolute_without_asterisk=yes
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fi
rm -f conftest*])
if test "x$grub_cv_i386_asm_absolute_without_asterisk" = xyes; then
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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([$grub_cv_i386_asm_absolute_without_asterisk])])
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dnl Check what symbol is defined as a bss start symbol.
dnl Written by Michael Hohmoth and Yoshinori K. Okuji.
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AC_DEFUN([grub_CHECK_BSS_START_SYMBOL],
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[AC_REQUIRE([AC_PROG_CC])
AC_MSG_CHECKING([if __bss_start is defined by the compiler])
AC_CACHE_VAL(grub_cv_check_uscore_uscore_bss_start_symbol,
[AC_LINK_IFELSE([AC_LANG_PROGRAM([[]],
[[asm ("incl __bss_start")]])],
[grub_cv_check_uscore_uscore_bss_start_symbol=yes],
[grub_cv_check_uscore_uscore_bss_start_symbol=no])])
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AC_MSG_RESULT([$grub_cv_check_uscore_uscore_bss_start_symbol])
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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])])
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AC_MSG_RESULT([$grub_cv_check_edata_symbol])
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AC_MSG_CHECKING([if _edata is defined by the compiler])
AC_CACHE_VAL(grub_cv_check_uscore_edata_symbol,
[AC_LINK_IFELSE([AC_LANG_PROGRAM([[]],
[[asm ("incl _edata")]])],
[grub_cv_check_uscore_edata_symbol=yes],
[grub_cv_check_uscore_edata_symbol=no])])
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AC_MSG_RESULT([$grub_cv_check_uscore_edata_symbol])
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AH_TEMPLATE([BSS_START_SYMBOL], [Define it to one of __bss_start, edata and _edata])
if test "x$grub_cv_check_uscore_uscore_bss_start_symbol" = xyes; then
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AC_DEFINE([BSS_START_SYMBOL], [__bss_start])
elif test "x$grub_cv_check_edata_symbol" = xyes; then
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AC_DEFINE([BSS_START_SYMBOL], [edata])
elif test "x$grub_cv_check_uscore_edata_symbol" = xyes; then
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AC_DEFINE([BSS_START_SYMBOL], [_edata])
else
AC_MSG_ERROR([none of __bss_start, edata or _edata is defined])
fi
])
dnl Check what symbol is defined as an end symbol.
dnl Written by Yoshinori K. Okuji.
2010-01-23 17:08:10 +00:00
AC_DEFUN([grub_CHECK_END_SYMBOL],
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[AC_REQUIRE([AC_PROG_CC])
AC_MSG_CHECKING([if end is defined by the compiler])
AC_CACHE_VAL(grub_cv_check_end_symbol,
[AC_LINK_IFELSE([AC_LANG_PROGRAM([[]],
[[asm ("incl end")]])],
[grub_cv_check_end_symbol=yes],
[grub_cv_check_end_symbol=no])])
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AC_MSG_RESULT([$grub_cv_check_end_symbol])
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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])])
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AC_MSG_RESULT([$grub_cv_check_uscore_end_symbol])
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AH_TEMPLATE([END_SYMBOL], [Define it to either end or _end])
if test "x$grub_cv_check_end_symbol" = xyes; then
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AC_DEFINE([END_SYMBOL], [end])
elif test "x$grub_cv_check_uscore_end_symbol" = xyes; then
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AC_DEFINE([END_SYMBOL], [_end])
else
AC_MSG_ERROR([neither end nor _end is defined])
fi
])
dnl Check if the C compiler generates calls to `__enable_execute_stack()'.
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AC_DEFUN([grub_CHECK_ENABLE_EXECUTE_STACK],[
AC_MSG_CHECKING([whether `$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'.
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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]
])
2008-07-24 Bean <bean123ch@gmail.com> * common.rmk (bin_UTILITIES): Add grub-pe2elf. (grub_pe2elf_SOURCES): New macro. (CLEANFILES): Add grub-pe2elf. * include/grub/efi/pe32.h (GRUB_PE32_SCN_ALIGN_1BYTES): New constant. (GRUB_PE32_SCN_ALIGN_2BYTES): Likewise. (GRUB_PE32_SCN_ALIGN_4BYTES): Likewise. (GRUB_PE32_SCN_ALIGN_8BYTES): Likewise. (GRUB_PE32_SCN_ALIGN_16BYTES): Likewise. (GRUB_PE32_SCN_ALIGN_32BYTES): Likewise. (GRUB_PE32_SCN_ALIGN_64BYTES): Likewise. (GRUB_PE32_SCN_ALIGN_SHIFT): Likewise. (GRUB_PE32_SCN_ALIGN_MASK): Likewise. (GRUB_PE32_SYM_CLASS_EXTERNAL): Likewise. (GRUB_PE32_SYM_CLASS_STATIC): Likewise. (GRUB_PE32_SYM_CLASS_FILE): Likewise. (GRUB_PE32_DT_FUNCTION): Likewise. (GRUB_PE32_REL_I386_DIR32): Likewise. (GRUB_PE32_REL_I386_REL32): Likewise. (grub_pe32_symbol): New structure. (grub_pe32_reloc): Likewise. * util/grub-pe2elf.c: New file. * configure.ac: Set TARGET_OBJ2ELF if host os is cygwin. Don't test for start symbol in non pc platform. * genmk.rb: Use TARGET_OBJ2ELF to convert native object format to elf. The following patches are from Christian Franke. * include/grub/dl.h: Remove .previous, gas supports this only for ELF format. * include/grub/symbol.h [__CYGWIN__] (#define FUNCTION/VARIABLE): Remove .type, gas supports this only for ELF format. * kern/dl.c (grub_dl_resolve_dependencies): Add check for trailing nullbytes in symbol table. This fixes an infinite loop if table is zero filled. * Makefile.in: Add autoconf replacements TARGET_IMG_LDSCRIPT, TARGET_IMG_LDFLAGS and EXEEXT. * aclocal.m4 (grub_PROG_OBJCOPY_ABSOLUTE): Replace -Wl,-N by TARGET_IMG_LDFLAGS_AC. (grub_CHECK_STACK_ARG_PROBE): New function. * conf/i386-pc.rmk: Replace -Wl,-N by TARGET_IMG_LDFLAGS. * conf/i386-pc-cygwin-ld-img.sc: New linker script. * configure.ac: Add check for linker script "conf/${target}-img-ld.c" to set TARGET_IMG_LD* accordingly. Add check for Cygwin to set TARGET_MOD_OBJCOPY accordingly. Add call to grub_CHECK_STACK_ARG_PROBE. Use TARGET_IMG_LDFLAGS to check start, bss_start, end symbols. * genkernsyms.sh.in: Handle HAVE_ASM_USCORE case. * genmk.rb: Add EXEEXT to CLEANFILES.
2008-07-24 14:56:30 +00:00
dnl Check if the C compiler supports `-mstack-arg-probe' (Cygwin).
2010-01-23 17:08:10 +00:00
AC_DEFUN([grub_CHECK_STACK_ARG_PROBE],[
2008-07-24 Bean <bean123ch@gmail.com> * common.rmk (bin_UTILITIES): Add grub-pe2elf. (grub_pe2elf_SOURCES): New macro. (CLEANFILES): Add grub-pe2elf. * include/grub/efi/pe32.h (GRUB_PE32_SCN_ALIGN_1BYTES): New constant. (GRUB_PE32_SCN_ALIGN_2BYTES): Likewise. (GRUB_PE32_SCN_ALIGN_4BYTES): Likewise. (GRUB_PE32_SCN_ALIGN_8BYTES): Likewise. (GRUB_PE32_SCN_ALIGN_16BYTES): Likewise. (GRUB_PE32_SCN_ALIGN_32BYTES): Likewise. (GRUB_PE32_SCN_ALIGN_64BYTES): Likewise. (GRUB_PE32_SCN_ALIGN_SHIFT): Likewise. (GRUB_PE32_SCN_ALIGN_MASK): Likewise. (GRUB_PE32_SYM_CLASS_EXTERNAL): Likewise. (GRUB_PE32_SYM_CLASS_STATIC): Likewise. (GRUB_PE32_SYM_CLASS_FILE): Likewise. (GRUB_PE32_DT_FUNCTION): Likewise. (GRUB_PE32_REL_I386_DIR32): Likewise. (GRUB_PE32_REL_I386_REL32): Likewise. (grub_pe32_symbol): New structure. (grub_pe32_reloc): Likewise. * util/grub-pe2elf.c: New file. * configure.ac: Set TARGET_OBJ2ELF if host os is cygwin. Don't test for start symbol in non pc platform. * genmk.rb: Use TARGET_OBJ2ELF to convert native object format to elf. The following patches are from Christian Franke. * include/grub/dl.h: Remove .previous, gas supports this only for ELF format. * include/grub/symbol.h [__CYGWIN__] (#define FUNCTION/VARIABLE): Remove .type, gas supports this only for ELF format. * kern/dl.c (grub_dl_resolve_dependencies): Add check for trailing nullbytes in symbol table. This fixes an infinite loop if table is zero filled. * Makefile.in: Add autoconf replacements TARGET_IMG_LDSCRIPT, TARGET_IMG_LDFLAGS and EXEEXT. * aclocal.m4 (grub_PROG_OBJCOPY_ABSOLUTE): Replace -Wl,-N by TARGET_IMG_LDFLAGS_AC. (grub_CHECK_STACK_ARG_PROBE): New function. * conf/i386-pc.rmk: Replace -Wl,-N by TARGET_IMG_LDFLAGS. * conf/i386-pc-cygwin-ld-img.sc: New linker script. * configure.ac: Add check for linker script "conf/${target}-img-ld.c" to set TARGET_IMG_LD* accordingly. Add check for Cygwin to set TARGET_MOD_OBJCOPY accordingly. Add call to grub_CHECK_STACK_ARG_PROBE. Use TARGET_IMG_LDFLAGS to check start, bss_start, end symbols. * genkernsyms.sh.in: Handle HAVE_ASM_USCORE case. * genmk.rb: Add EXEEXT to CLEANFILES.
2008-07-24 14:56:30 +00:00
[# Smashing stack arg probe.
sap_possible=yes]
AC_MSG_CHECKING([whether `$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).
2010-01-23 17:08:10 +00:00
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 $reldir testdir/util 2>/dev/null ; then]
AC_MSG_RESULT([yes])
[link_dir=yes
else
link_dir=no]
AC_MSG_RESULT([no])
[fi
rm -rf testdir]
])
dnl Check if the C compiler supports `-fPIE'.
2010-01-23 17:08:10 +00:00
AC_DEFUN([grub_CHECK_PIE],[
[# Position independent executable.
pie_possible=yes]
AC_MSG_CHECKING([whether `$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]
])