[PATCH] reintroduce BUILD_LDFLAGS for the cross-compile case

[Andrey Borzenkov <arvidjaar@gmail.com>]

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This allows providing separate LDFLAGS for build and host environment, 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 environment on Windows) while continue to use default
build time dynamic linking.

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

In principle, it would be enough to just reset LDFLAGS before
performing build time tests, but I think this functionality is useful
by itself (e.g. to be able to link with libraries in non-standard
location). And patch itself it trivial enough.

Attached because git won't send mail with so long lines.

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From: Andrey Borzenkov <arvidjaar@gmail.com>
Subject: [PATCH] reintroduce BUILD_LDFLAGS for the cross-compile case

This allows providing separate LDFLAGS for build and host environment, 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 environment on Windows) while continue to use default
build time dynamic linking.

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

---
 INSTALL               |  3 ++-
 Makefile.am           |  8 ++++----
 configure.ac          | 13 ++++++++-----
 grub-core/Makefile.am |  6 +++---
 4 files changed, 17 insertions(+), 13 deletions(-)

diff --git a/INSTALL b/INSTALL
index db12530..b67cd7f 100644
--- a/INSTALL
+++ b/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.
diff --git a/Makefile.am b/Makefile.am
index 320e86f..1bbec0e 100644
--- a/Makefile.am
+++ b/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
diff --git a/configure.ac b/configure.ac
index 7c5d080..2e4cf3c 100644
--- a/configure.ac
+++ b/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 because GRUB does not need to use those variables for the build
-dnl type, so there is no conflict. Variables with the prefix "TARGET_"
-dnl (such as TARGET_CC, TARGET_CFLAGS, etc.) are used for the target
-dnl type.
+dnl CC, CFLAGS, etc.) for the host type, variables with prefix "BUILD_"
+dnl (such as BUILD_CC, BUILD_CFLAGS, etc.) for the build type and variables
+dnl with the prefix "TARGET_" (such as TARGET_CC, TARGET_CFLAGS, etc.) are
+dnl used for the target type. See INSTALL for full list of variables.
 
 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=
diff --git a/grub-core/Makefile.am b/grub-core/Makefile.am
index 1b3142d..13b7979 100644
--- a/grub-core/Makefile.am
+++ b/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
-- 
tg: (0776112..) u/build_ldflags (depends on: master)