Re: [PATCH v2] Explicitly check for linking format to use for efiemu64 module

["Vladimir 'φ-coder/phcoder' Serbinenko" <phcoder@gmail.com>]

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On 25.11.2013 19:13, Andrey Borzenkov wrote:
> Similar to check for target linking format, also check for efiemu64
> instead of hardcoding -melf_x86_64. This fixes compilation on *BSD
> variants. We cannot easily reuse main target check because platforms
> are different (main target is 32 bit and efiemu64 - 64 bit).
> 
> This commit adds EFIEMU64_LINK_FORMAT that contains detected
> link option and is used in efiemu64.o linking instead of hardcoded
> value.
Go ahead
> 
> Reported-By: Beeblebrox <zaphod@berentweb.com>
> ---
>  configure.ac          | 29 +++++++++++++++++++++++++++--
>  grub-core/Makefile.am |  9 ++++-----
>  2 files changed, 31 insertions(+), 7 deletions(-)
> 
> diff --git a/configure.ac b/configure.ac
> index d1292c9..1989f87 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -654,6 +654,30 @@ if test x"$efiemu_excuse" = x ; then
>       efiemu_excuse="cannot compile with -m64 -mcmodel=large -mno-red-zone -nostdlib"
>    fi
>  fi
> +if test x"$efiemu_excuse" = x ; then
> +  AC_CACHE_CHECK([for efiemu64 linking format], [grub_cv_target_cc_efiemu64_link_format], [
> +    grub_cv_target_cc_efiemu64_link_format=unknown
> +    for format in -melf_x86_64 -melf_x86_64_fbsd -melf_x86_64_obsd -melf_x86_64_haiku -arch,x86_64; do
> +      CFLAGS="-m64 -nostdlib -O2 -mcmodel=large -mno-red-zone"
> +      LDFLAGS="-m64 -Wl,$format -nostdlib -static"
> +      AC_LINK_IFELSE([AC_LANG_PROGRAM([[
> +      asm (".globl start; start:");
> +      asm (".globl _start; _start:");
> +      asm (".globl __start; __start:");
> +      void __main (void);
> +      void __main (void) {}
> +      ]], [[]])], [flag=1], [flag=0])
> +      if test x"$flag" = x1; then
> +        grub_cv_target_cc_efiemu64_link_format="$format"
> +	break;
> +      fi
> +    done])
> +  if test x"$grub_cv_target_cc_efiemu64_link_format" = xunknown; then
> +    efiemu_excuse="no suitable link format for efiemu64 found"
> +  else
> +    EFIEMU64_LINK_FORMAT="-Wl,$grub_cv_target_cc_efiemu64_link_format"
> +  fi
> +fi
>  if test x"$enable_efiemu" = xyes && test x"$efiemu_excuse" != x ; then
>    AC_MSG_ERROR([efiemu runtime was explicitly requested but can't be compiled])
>  fi
> @@ -663,11 +687,12 @@ else
>  enable_efiemu=no
>  fi
>  AC_SUBST([enable_efiemu])
> +AC_SUBST([EFIEMU64_LINK_FORMAT])
>  
>  CFLAGS="$TARGET_CFLAGS"
>  
>  if test x"$target_cpu" = xi386 || test x"$target_cpu" = xx86_64; then
> -  AC_CACHE_CHECK([for linking format], [grub_cv_target_cc_link_format], [
> +  AC_CACHE_CHECK([for target linking format], [grub_cv_target_cc_link_format], [
>      grub_cv_target_cc_link_format=unknown
>      for format in -melf_${target_cpu} -melf_${target_cpu}_fbsd -melf_${target_cpu}_obsd -melf_${target_cpu}_haiku -m${target_cpu}pe -arch,${target_cpu}; do
>        if test x${target_cpu} != xi386 && test x$format = x${target_cpu}pe; then
> @@ -681,7 +706,7 @@ if test x"$target_cpu" = xi386 || test x"$target_cpu" = xx86_64; then
>        asm (".globl __start; __start:");
>        void __main (void);
>        void __main (void) {}
> -      ]], [[]])], [flag=1], [])
> +      ]], [[]])], [flag=1], [flag=0])
>        if test x"$flag" = x1; then
>          grub_cv_target_cc_link_format="$format"
>  	break;
> diff --git a/grub-core/Makefile.am b/grub-core/Makefile.am
> index e2da083..3ca52ea 100644
> --- a/grub-core/Makefile.am
> +++ b/grub-core/Makefile.am
> @@ -399,7 +399,7 @@ efiemu32.o: efiemu/runtime/efiemu.c $(TARGET_OBJ2ELF)
>  	fi
>  
>  efiemu64_c.o: efiemu/runtime/efiemu.c
> -	if test "x$(TARGET_APPLE_LINKER)" = x1; then \
> +	if test "x$(EFIEMU64_LINK_FORMAT)" = x-arch,x86_64; then \
>  	  $(TARGET_CC) $(DEFS) $(INCLUDES) $(CPPFLAGS_EFIEMU) $(CPPFLAGS_DEFAULT) -m64 -nostdlib -Wall -Werror -mno-red-zone -c -o $@ $< || exit 1; \
>  	else \
>  	  $(TARGET_CC) $(DEFS) $(INCLUDES) $(CPPFLAGS_EFIEMU) $(CPPFLAGS_DEFAULT) -m64 -nostdlib -Wall -Werror -O2 -mcmodel=large -mno-red-zone -c -o $@ $< || exit 1; \
> @@ -407,7 +407,7 @@ efiemu64_c.o: efiemu/runtime/efiemu.c
>  
>  efiemu64_s.o: efiemu/runtime/efiemu.S
>  	-rm -f $@
> -	if test "x$(TARGET_APPLE_LINKER)" = x1; then \
> +	if test "x$(EFIEMU64_LINK_FORMAT)" = x-arch,x86_64; then \
>  	  $(TARGET_CC) $(DEFS) $(INCLUDES) $(CPPFLAGS_EFIEMU) $(CPPFLAGS_DEFAULT) -m64 -Wall -Werror -nostdlib -O2 -mno-red-zone -c -o $@ $< || exit 1; \
>  	else \
>  	  $(TARGET_CC) $(DEFS) $(INCLUDES) $(CPPFLAGS_EFIEMU) $(CPPFLAGS_DEFAULT) -m64 -Wall -Werror -nostdlib -O2 -mcmodel=large -mno-red-zone -c -o $@ $< || exit 1; \
> @@ -415,14 +415,13 @@ efiemu64_s.o: efiemu/runtime/efiemu.S
>  
>  efiemu64.o: efiemu64_c.o efiemu64_s.o $(TARGET_OBJ2ELEF)
>  	-rm -f $@; \
> -	if test "x$(TARGET_APPLE_LINKER)" = x1; then \
> +	if test "x$(EFIEMU64_LINK_FORMAT)" = x-arch,x86_64; then \
>  	  rm -f $@.bin; \
>  	  $(TARGET_CC) -m64 -Wl,-r -nostdlib -o $@.bin $^ || exit 1; \
>  	  $(TARGET_OBJCONV) -felf64 -nu -nd $@.bin $@ || exit 1; \
>  	  rm -f $@.bin; \
>  	else \
> -	  $(TARGET_CC) -m64 -Wl,-melf_x86_64 -nostdlib -Wl,-r -o $@ $^ || exit 1; \
> -	  if test ! -z "$(TARGET_OBJ2ELF)"; then $(TARGET_OBJ2ELF) $@ || (rm -f $@; exit 1); fi; \
> +	  $(TARGET_CC) -m64 $(EFIEMU64_LINK_FORMAT) -nostdlib -Wl,-r -o $@ $^ || exit 1; \
>  	fi
>  
>  platform_DATA += efiemu32.o efiemu64.o
> 



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