[PATCH] Allow compiling xfsprogs in a cross compile environment.

* [PATCH] Allow compiling xfsprogs in a cross compile environment.
       [not found] <AMHSBOU5+XsM503_3khtVBWa+Ymz9BrezGzpxpJEr3axCMuR1Q@mail.gmail.com>
@ 2016-06-04  0:31 ` Gwendal Grignou
  2016-06-04  0:43   ` Mike Frysinger
  2016-06-08  7:03   ` Christoph Hellwig
  0 siblings, 2 replies; 3+ messages in thread
From: Gwendal Grignou @ 2016-06-04  0:31 UTC (permalink / raw)
  To: hch; +Cc: vapier, tytso, fstests, xfs

Without this patch, we are using the same compiler and options for the host
compiler (BUILD_CC) and the target compiler (CC), and we would get error
messages at compilation:
x86_64-pc-linux-gnu-gcc -O2 -O2 -pipe -march=armv7-a -mtune=cortex-a15 ...
x86_64-pc-linux-gnu-gcc.real: error: unrecognized command line option
'-mfpu=neon'
'-mfloat-abi=hard'
'-clang-syntax'
'-mfpu=neon'
'-mfloat-abi=hard'
'-clang-syntax'

Add BUILD_CC and BUILD_CFLAGS as precious variables to allow setting it up
from the ebuild.

Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
---
 This patch issue has been pushed into gentoo as well:
 https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=8806f22bf65d99348770bbb6207d199c74fd96c5

 configure            | 26 +++++++++++++++++++++-----
 configure.ac         | 20 +++++++++++++++-----
 include/builddefs.in |  6 ++++--
 libxfs/Makefile      |  4 ++--
 4 files changed, 42 insertions(+), 14 deletions(-)

diff --git a/configure b/configure
index 325081f..863a447 100755
--- a/configure
+++ b/configure
@@ -700,6 +700,7 @@ libreadline
 enable_blkid
 enable_gettext
 enable_shared
+BUILD_CFLAGS
 BUILD_CC
 CPP
 LT_SYS_LIBRARY_PATH
@@ -806,7 +807,9 @@ LDFLAGS
 LIBS
 CPPFLAGS
 LT_SYS_LIBRARY_PATH
-CPP'
+CPP
+BUILD_CC
+BUILD_CFLAGS'
 
 
 # Initialize some variables set by options.
@@ -1456,6 +1459,9 @@ Some influential environment variables:
   LT_SYS_LIBRARY_PATH
               User-defined run-time library search path.
   CPP         C preprocessor
+  BUILD_CC    C compiler for build tools
+  BUILD_CFLAGS
+              C compiler flags for build tools
 
 Use these variables to override the choices made by `configure' or to help
 it to find libraries and programs with nonstandard names/locations.
@@ -11957,11 +11963,12 @@ ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
 ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
 ac_compiler_gnu=$ac_cv_c_compiler_gnu
 
-if test $cross_compiling = no; then
-  BUILD_CC="$CC"
 
-else
-  for ac_prog in gcc cc
+if test "${BUILD_CC+set}" != "set"; then
+  if test $cross_compiling = no; then
+    BUILD_CC="$CC"
+  else
+    for ac_prog in gcc cc
 do
   # Extract the first word of "$ac_prog", so it can be a program name with args.
 set dummy $ac_prog; ac_word=$2
@@ -12003,6 +12010,15 @@ fi
   test -n "$BUILD_CC" && break
 done
 
+  fi
+fi
+
+if test "${BUILD_CFLAGS+set}" != "set"; then
+  if test $cross_compiling = no; then
+    BUILD_CFLAGS="$CFLAGS"
+  else
+    BUILD_CFLAGS="-g -O2"
+  fi
 fi
 
 # Check whether --enable-shared was given.
diff --git a/configure.ac b/configure.ac
index d44438f..fc286b3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -9,11 +9,21 @@ AC_PREFIX_DEFAULT(/usr)
 AC_PROG_LIBTOOL
 
 AC_PROG_CC
-if test $cross_compiling = no; then
-  BUILD_CC="$CC"
-  AC_SUBST(BUILD_CC)
-else
-  AC_CHECK_PROGS(BUILD_CC, gcc cc)
+AC_ARG_VAR(BUILD_CC, [C compiler for build tools])
+if test "${BUILD_CC+set}" != "set"; then
+  if test $cross_compiling = no; then
+    BUILD_CC="$CC"
+  else
+    AC_CHECK_PROGS(BUILD_CC, gcc cc)
+  fi
+fi
+AC_ARG_VAR(BUILD_CFLAGS, [C compiler flags for build tools])
+if test "${BUILD_CFLAGS+set}" != "set"; then
+  if test $cross_compiling = no; then
+    BUILD_CFLAGS="$CFLAGS"
+  else
+    BUILD_CFLAGS="-g -O2"
+  fi
 fi
 
 AC_ARG_ENABLE(shared,
diff --git a/include/builddefs.in b/include/builddefs.in
index c2ca4cb..9ca57a6 100644
--- a/include/builddefs.in
+++ b/include/builddefs.in
@@ -27,6 +27,7 @@ MALLOCLIB = @malloc_lib@
 LOADERFLAGS = @LDFLAGS@
 LTLDFLAGS = @LDFLAGS@
 CFLAGS = @CFLAGS@
+BUILD_CFLAGS = @BUILD_CFLAGS@
 
 LIBRT = @librt@
 LIBUUID = @libuuid@
@@ -150,7 +151,7 @@ PCFLAGS+= -DENABLE_BLKID
 endif
 
 
-GCFLAGS = $(OPTIMIZER) $(DEBUG) \
+GCFLAGS = $(DEBUG) \
 	  -DVERSION=\"$(PKG_VERSION)\" -DLOCALEDIR=\"$(PKG_LOCALE_DIR)\"  \
 	  -DPACKAGE=\"$(PKG_NAME)\" -I$(TOPDIR)/include -I$(TOPDIR)/libxfs
 
@@ -158,8 +159,9 @@ ifeq ($(ENABLE_GETTEXT),yes)
 GCFLAGS += -DENABLE_GETTEXT
 endif
 
+BUILD_CFLAGS += $(GCFLAGS) $(PCFLAGS)
 # First, Global, Platform, Local CFLAGS
-CFLAGS += $(FCFLAGS) $(GCFLAGS) $(PCFLAGS) $(LCFLAGS)
+CFLAGS += $(FCFLAGS) $(OPTIMIZER) $(GCFLAGS) $(PCFLAGS) $(LCFLAGS)
 
 include $(TOPDIR)/include/buildmacros
 
diff --git a/libxfs/Makefile b/libxfs/Makefile
index 873d4ec..8d728c0 100644
--- a/libxfs/Makefile
+++ b/libxfs/Makefile
@@ -111,7 +111,7 @@ default: crc32selftest ltdepend $(LTLIBRARY)
 
 crc32table.h: gen_crc32table.c
 	@echo "    [CC]     gen_crc32table"
-	$(Q) $(BUILD_CC) $(CFLAGS) -o gen_crc32table $<
+	$(Q) $(BUILD_CC) $(BUILD_CFLAGS) -o gen_crc32table $<
 	@echo "    [GENERATE] $@"
 	$(Q) ./gen_crc32table > crc32table.h
 
@@ -122,7 +122,7 @@ crc32table.h: gen_crc32table.c
 # disk.
 crc32selftest: gen_crc32table.c crc32table.h crc32.c
 	@echo "    [TEST]    CRC32"
-	$(Q) $(BUILD_CC) $(CFLAGS) -D CRC32_SELFTEST=1 crc32.c -o $@
+	$(Q) $(BUILD_CC) $(BUILD_CFLAGS) -D CRC32_SELFTEST=1 crc32.c -o $@
 	$(Q) ./$@
 
 # set up include/xfs header directory
-- 
2.8.0.rc3.226.g39d4020

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