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From: Hans Ulrich Niedermann <hun@n-dimensional.de>
To: grub-devel@gnu.org
Cc: Hans Ulrich Niedermann <hun@n-dimensional.de>
Subject: [MULTIBOOT2 SPEC PATCH v4 19/27] multiboot2: Set -nostdlib before AC_PROG_CC for x-compile
Date: Fri, 15 May 2020 05:43:42 +0200	[thread overview]
Message-ID: <20200515034349.133092-20-hun@n-dimensional.de> (raw)
In-Reply-To: <20200515034349.133092-1-hun@n-dimensional.de>

Set -nostdlib in CFLAGS and LDFLAGS before AC_PROG_CC if we
appear to be cross-compiling.

This makes the example kernel build work on my x86_64 system
with both

  * native compile to generate i386 example kernel
       ./configure --enable-example-kernel

  * cross-compile to generate mips example kernel
       ./configure --host=mips64-linux-gnu --enable-example-kernel

It remains to be verified how this works on other systems,
namely native mips systems, and non-x86 systems like arm.

Signed-off-by: Hans Ulrich Niedermann <hun@n-dimensional.de>

diff --git a/configure.ac b/configure.ac
index 830b1f57e..6b0718451 100644
--- a/configure.ac
+++ b/configure.ac
@@ -22,11 +22,18 @@ AM_INIT_AUTOMAKE([1.10.1])
 # Programs
 #
 
+AC_CANONICAL_BUILD
+AC_CANONICAL_HOST
+
+AS_IF([test "x$host" != "x$build"], [dnl
+  CFLAGS="-nostdlib $CFLAGS"
+  LDFLAGS="-nostdlib $LDFLAGS"
+])
+
 AC_PROG_CC
 AM_PROG_AS
 
 dnl Build the example Multiboot2 kernel (if possible on this host)
-AC_CANONICAL_HOST
 kernel_boot_arch=unsupported
 kernel_ccasflags=
 kernel_cflags=
@@ -57,8 +64,6 @@ AM_CONDITIONAL([BUILD_EXAMPLE_KERNEL],
                [test "x$enable_example_kernel" = xyes &&
                 test "x$kernel_boot_arch" != "xunsupported"])
 
-CFLAGS="-nostdlib $CFLAGS"
-
 dnl Output.
 AC_CONFIG_FILES([Makefile doc/Makefile])
 AC_OUTPUT
-- 
2.26.2



  parent reply	other threads:[~2020-05-15  3:47 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-15  3:43 [MULTIBOOT2 SPEC PATCH v4 00/27] multiboot2: Clean up the example kernel Hans Ulrich Niedermann
2020-05-15  3:43 ` [MULTIBOOT2 SPEC PATCH v4 01/27] multiboot2: Allow autogen.sh to run with current gnulib Hans Ulrich Niedermann
2020-05-15  3:43 ` [MULTIBOOT2 SPEC PATCH v4 02/27] multiboot2: Use .gitignore files Hans Ulrich Niedermann
2020-05-15  3:43 ` [MULTIBOOT2 SPEC PATCH v4 03/27] multiboot2: Use m4 quoting and AS_HELP_STRING Hans Ulrich Niedermann
2020-05-15  3:43 ` [MULTIBOOT2 SPEC PATCH v4 04/27] multiboot2: Remove obsolete compat code for ancient Autoconf Hans Ulrich Niedermann
2020-05-15  3:43 ` [MULTIBOOT2 SPEC PATCH v4 05/27] multiboot2: Remove CCAS workarounds for pre-2005 Automake Hans Ulrich Niedermann
2020-05-15  3:43 ` [MULTIBOOT2 SPEC PATCH v4 06/27] multiboot2: Remove unnecessary definition of CC Hans Ulrich Niedermann
2020-05-15  3:43 ` [MULTIBOOT2 SPEC PATCH v4 07/27] multiboot2: Automake generates dependencies automatically Hans Ulrich Niedermann
2020-05-15  3:43 ` [MULTIBOOT2 SPEC PATCH v4 08/27] multiboot2: Automake cleans built programs automatically Hans Ulrich Niedermann
2020-05-15  3:43 ` [MULTIBOOT2 SPEC PATCH v4 09/27] multiboot2: Use the constants by their proper names Hans Ulrich Niedermann
2020-05-15  3:43 ` [MULTIBOOT2 SPEC PATCH v4 10/27] multiboot2: Rename boot.S to boot_i386.S Hans Ulrich Niedermann
2020-05-15  3:43 ` [MULTIBOOT2 SPEC PATCH v4 11/27] multiboot2: Add boot_i386.S to shipped files Hans Ulrich Niedermann
2020-05-15  3:43 ` [MULTIBOOT2 SPEC PATCH v4 12/27] multiboot2: Add boot_mips.S example code to docs Hans Ulrich Niedermann
2020-05-15  3:43 ` [MULTIBOOT2 SPEC PATCH v4 13/27] multiboot2: Build arch specific boot code Hans Ulrich Niedermann
2020-05-15  3:43 ` [MULTIBOOT2 SPEC PATCH v4 14/27] multiboot2: Fix example kernel header tag alignment Hans Ulrich Niedermann
2020-05-15  3:43 ` [MULTIBOOT2 SPEC PATCH v4 15/27] multiboot2: Remove unreferenced AOUT_KLUDGE Hans Ulrich Niedermann
2020-05-15  3:43 ` [MULTIBOOT2 SPEC PATCH v4 16/27] multiboot2: Change "Multiboot" in comments to "Multiboot2" Hans Ulrich Niedermann
2020-05-15  3:43 ` [MULTIBOOT2 SPEC PATCH v4 17/27] multiboot2: Clean up stack (cdecl calling conventions) Hans Ulrich Niedermann
2020-05-15  3:43 ` [MULTIBOOT2 SPEC PATCH v4 18/27] multiboot2: Use predefined #ifdef __ASSEMBLER__ Hans Ulrich Niedermann
2020-05-15  3:43 ` Hans Ulrich Niedermann [this message]
2020-05-15  3:43 ` [MULTIBOOT2 SPEC PATCH v4 20/27] multiboot2: mips build wants __start symbol Hans Ulrich Niedermann
2020-05-15  3:43 ` [MULTIBOOT2 SPEC PATCH v4 21/27] multiboot2: "make distcheck" with example kernel enabled Hans Ulrich Niedermann
2020-05-15  3:43 ` [MULTIBOOT2 SPEC PATCH v4 22/27] multiboot2: Always define the kernel_* vars Hans Ulrich Niedermann
2020-05-15  3:43 ` [MULTIBOOT2 SPEC PATCH v4 23/27] multiboot2: Generate per object file listings Hans Ulrich Niedermann
2020-05-15 15:14   ` Hans Ulrich Niedermann
2020-05-15  3:43 ` [MULTIBOOT2 SPEC PATCH v4 24/27] multiboot2: Generate a kernel.map map file Hans Ulrich Niedermann
2020-05-15  3:43 ` [MULTIBOOT2 SPEC PATCH v4 25/27] multiboot2: Generate gcc temp files (*.i and *.s) Hans Ulrich Niedermann
2020-05-15  3:43 ` [MULTIBOOT2 SPEC PATCH v4 26/27] multiboot2: Generate symbol lists and disassembly file Hans Ulrich Niedermann
2020-05-15  3:43 ` [MULTIBOOT2 SPEC PATCH v4 27/27] multiboot2: Add labels around the termination tag Hans Ulrich Niedermann

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