reintroduce BUILD_LDFLAGS for the cross-compile case

This allows providing separate LDFLAGS for build and host environments, which
are not necessary the same for cross-compile case. In particular, it allows
building host programs statically to not depend on presence of libraries at
run-time (e.g. MinGW DLLs on Windows) while continue to use default dynamic
linking at build time.

Also fix obsolete comments in confgure.ac - we do use different environment
for build and host now.

ChangeLog

@@ -1,3 +1,10 @@
+2014-01-07  Andrey Borzenkov <arvidjaar@gmail.com>
+
+	* configure.ac: Add support for BUILD_LDFLAGS.
+	* Makefile.am: Use BUILD_LDFLAGS for build time programs here ...
+	* grub-core/Makefile.am: ... and here.
+	* INSTALL: Mention BUILD_LDFLAGS.
+
 2014-01-18  Vladimir Serbinenko  <phcoder@gmail.com>
 
 	* util/grub-mount.c: Extend GCC warning workaround to grub-mount.

INSTALL

@@ -168,7 +168,8 @@ corresponding platform are not needed for the platform in question.
        generate sin and cos tables.
     2. BUILD_CFLAGS= for C options for build.
     3. BUILD_CPPFLAGS= for C preprocessor options for build.
-    4. BUILD_FREETYPE= for freetype-config for build (optional).
+    4. BUILD_LDFLAGS= for linker options for build.
+    5. BUILD_FREETYPE= for freetype-config for build (optional).
 
   - For host
     1. --host= to autoconf name of host.

Makefile.am

@@ -67,20 +67,20 @@ endif
 starfield_theme_files = $(srcdir)/themes/starfield/blob_w.png $(srcdir)/themes/starfield/boot_menu_c.png $(srcdir)/themes/starfield/boot_menu_e.png $(srcdir)/themes/starfield/boot_menu_ne.png $(srcdir)/themes/starfield/boot_menu_n.png $(srcdir)/themes/starfield/boot_menu_nw.png $(srcdir)/themes/starfield/boot_menu_se.png $(srcdir)/themes/starfield/boot_menu_s.png $(srcdir)/themes/starfield/boot_menu_sw.png $(srcdir)/themes/starfield/boot_menu_w.png $(srcdir)/themes/starfield/slider_c.png $(srcdir)/themes/starfield/slider_n.png $(srcdir)/themes/starfield/slider_s.png $(srcdir)/themes/starfield/starfield.png $(srcdir)/themes/starfield/terminal_box_c.png $(srcdir)/themes/starfield/terminal_box_e.png $(srcdir)/themes/starfield/terminal_box_ne.png $(srcdir)/themes/starfield/terminal_box_n.png $(srcdir)/themes/starfield/terminal_box_nw.png $(srcdir)/themes/starfield/terminal_box_se.png $(srcdir)/themes/starfield/terminal_box_s.png $(srcdir)/themes/starfield/terminal_box_sw.png $(srcdir)/themes/starfield/terminal_box_w.png $(srcdir)/themes/starfield/theme.txt $(srcdir)/themes/starfield/README $(srcdir)/themes/starfield/COPYING.CC-BY-SA-3.0
 
 build-grub-mkfont: util/grub-mkfont.c grub-core/unidata.c grub-core/kern/emu/misc.c util/misc.c
-	$(BUILD_CC) -o $@ -I$(top_srcdir)/include $(BUILD_CFLAGS) $(BUILD_CPPFLAGS) -DGRUB_MKFONT=1 -DGRUB_BUILD=1 -DGRUB_UTIL=1 -DGRUB_BUILD_PROGRAM_NAME=\"build-grub-mkfont\" $^ $(build_freetype_cflags) $(build_freetype_libs)
+	$(BUILD_CC) -o $@ -I$(top_srcdir)/include $(BUILD_CFLAGS) $(BUILD_CPPFLAGS) $(BUILD_LDFLAGS) -DGRUB_MKFONT=1 -DGRUB_BUILD=1 -DGRUB_UTIL=1 -DGRUB_BUILD_PROGRAM_NAME=\"build-grub-mkfont\" $^ $(build_freetype_cflags) $(build_freetype_libs)
 CLEANFILES += build-grub-mkfont
 
 garbage-gen: util/garbage-gen.c
-	$(BUILD_CC) -o $@ $(BUILD_CFLAGS) $(BUILD_CPPFLAGS)  $^
+	$(BUILD_CC) -o $@ $(BUILD_CFLAGS) $(BUILD_CPPFLAGS) $(BUILD_LDFLAGS)  $^
 CLEANFILES += garbage-gen
 EXTRA_DIST += util/garbage-gen.c
 
 build-grub-gen-asciih: util/grub-gen-asciih.c
-	$(BUILD_CC) -o $@ -I$(top_srcdir)/include $(BUILD_CFLAGS) $(BUILD_CPPFLAGS) -DGRUB_MKFONT=1 -DGRUB_BUILD=1 -DGRUB_UTIL=1 $^ $(build_freetype_cflags) $(build_freetype_libs) -Wall -Werror
+	$(BUILD_CC) -o $@ -I$(top_srcdir)/include $(BUILD_CFLAGS) $(BUILD_CPPFLAGS) $(BUILD_LDFLAGS) -DGRUB_MKFONT=1 -DGRUB_BUILD=1 -DGRUB_UTIL=1 $^ $(build_freetype_cflags) $(build_freetype_libs) -Wall -Werror
 CLEANFILES += build-grub-gen-asciih
 
 build-grub-gen-widthspec: util/grub-gen-widthspec.c
-	$(BUILD_CC) -o $@ -I$(top_srcdir)/include $(BUILD_CFLAGS) $(BUILD_CPPFLAGS) -DGRUB_MKFONT=1 -DGRUB_BUILD=1 -DGRUB_UTIL=1 $^ $(build_freetype_cflags) $(build_freetype_libs) -Wall -Werror
+	$(BUILD_CC) -o $@ -I$(top_srcdir)/include $(BUILD_CFLAGS) $(BUILD_CPPFLAGS) $(BUILD_LDFLAGS) -DGRUB_MKFONT=1 -DGRUB_BUILD=1 -DGRUB_UTIL=1 $^ $(build_freetype_cflags) $(build_freetype_libs) -Wall -Werror
 CLEANFILES += build-grub-gen-widthspec
 
 if COND_STARFIELD

configure.ac

@@ -26,11 +26,10 @@ dnl This is necessary because the target type in autoconf does not
 dnl describe such a system very well.
 dnl
 dnl The current strategy is to use variables with no prefix (such as
-dnl CC, CFLAGS, etc.) for the host type as well as the build type,
+dnl CC, CFLAGS, etc.) for the host type, variables with prefix "BUILD_"
-dnl because GRUB does not need to use those variables for the build
+dnl (such as BUILD_CC, BUILD_CFLAGS, etc.) for the build type and variables
-dnl type, so there is no conflict. Variables with the prefix "TARGET_"
+dnl with the prefix "TARGET_" (such as TARGET_CC, TARGET_CFLAGS, etc.) are
-dnl (such as TARGET_CC, TARGET_CFLAGS, etc.) are used for the target
+dnl used for the target type. See INSTALL for full list of variables.
-dnl type.
 
 AC_INIT([GRUB],[2.02~beta2],[bug-grub@gnu.org])
 
@@ -477,6 +476,7 @@ AC_SUBST(HOST_CC)
 AC_SUBST(BUILD_CC)
 AC_SUBST(BUILD_CFLAGS)
 AC_SUBST(BUILD_CPPFLAGS)
+AC_SUBST(BUILD_LDFLAGS)
 AC_SUBST(TARGET_CC)
 AC_SUBST(TARGET_NM)
 AC_SUBST(TARGET_RANLIB)
@@ -1290,10 +1290,12 @@ SAVED_CC="$CC"
 SAVED_CPP="$CPP"
 SAVED_CFLAGS="$CFLAGS"
 SAVED_CPPFLAGS="$CPPFLAGS"
+SAVED_LDFLAGS="$LDFLAGS"
 CC="$BUILD_CC"
 CPP="$BUILD_CPP"
 CFLAGS="$BUILD_CFLAGS"
 CPPFLAGS="$BUILD_CPPFLAGS"
+LDFLAGS="$BUILD_LDFAGS"
 
 unset ac_cv_c_bigendian
 unset ac_cv_header_ft2build_h
@@ -1356,6 +1358,7 @@ CC="$SAVED_CC"
 CPP="$SAVED_CPP"
 CFLAGS="$SAVED_CFLAGS"
 CPPFLAGS="$SAVED_CPPFLAGS"
+LDFLAGS="$SAVED_LDFLAGS"
 
 
 DJVU_FONT_SOURCE=

grub-core/Makefile.am

@@ -27,14 +27,14 @@ CPPFLAGS_LIBRARY += $(CPPFLAGS_PLATFORM)
 CCASFLAGS_LIBRARY += $(CCASFLAGS_PLATFORM)
 
 build-grub-pep2elf: $(top_srcdir)/util/grub-pe2elf.c $(top_srcdir)/grub-core/kern/emu/misc.c $(top_srcdir)/util/misc.c
-	$(BUILD_CC) -o $@ -I$(top_srcdir)/include $(BUILD_CFLAGS) $(BUILD_CPPFLAGS) -DGRUB_BUILD=1 -DGRUB_TARGET_WORDSIZE=64 -DGRUB_UTIL=1 -DGRUB_BUILD_PROGRAM_NAME=\"build-grub-pep2elf\" $^
+	$(BUILD_CC) -o $@ -I$(top_srcdir)/include $(BUILD_CFLAGS) $(BUILD_CPPFLAGS) $(BUILD_LDFLAGS) -DGRUB_BUILD=1 -DGRUB_TARGET_WORDSIZE=64 -DGRUB_UTIL=1 -DGRUB_BUILD_PROGRAM_NAME=\"build-grub-pep2elf\" $^
 
 build-grub-pe2elf: $(top_srcdir)/util/grub-pe2elf.c $(top_srcdir)/grub-core/kern/emu/misc.c $(top_srcdir)/util/misc.c
-	$(BUILD_CC) -o $@ -I$(top_srcdir)/include $(BUILD_CFLAGS) $(BUILD_CPPFLAGS) -DGRUB_BUILD=1 -DGRUB_TARGET_WORDSIZE=32 -DGRUB_UTIL=1 -DGRUB_BUILD_PROGRAM_NAME=\"build-grub-pe2elf\" $^
+	$(BUILD_CC) -o $@ -I$(top_srcdir)/include $(BUILD_CFLAGS) $(BUILD_CPPFLAGS) $(BUILD_LDFLAGS) -DGRUB_BUILD=1 -DGRUB_TARGET_WORDSIZE=32 -DGRUB_UTIL=1 -DGRUB_BUILD_PROGRAM_NAME=\"build-grub-pe2elf\" $^
 
 # gentrigtables
 gentrigtables: gentrigtables.c
-	$(BUILD_CC) -o $@ -I$(top_srcdir)/include $(BUILD_CFLAGS) $(BUILD_CPPFLAGS) $< $(BUILD_LIBM)
+	$(BUILD_CC) -o $@ -I$(top_srcdir)/include $(BUILD_CFLAGS) $(BUILD_CPPFLAGS) $(BUILD_LDFLAGS) $< $(BUILD_LIBM)
 CLEANFILES += gentrigtables
 
 # trigtables.c