When cross compiling btrfs-progs, following error will prevent
btrfs-progs to be compiled:
[CC] mktables
[TABLE] kernel-lib/tables.c
/bin/sh: ./mktables: cannot execute binary file: Exec format error
make: *** No rule to make target 'kernel-lib/tables.c', needed by 'kernel-lib/tables.o'. Stop.
"mktables" should only be executed in host environment, while @CC
set by autoconf will follow host/build/target setting, causing mktables
to be cross-compiled.
The fix is to introduce a new @HOSTCC for mktables, which will not be
affected by host/build/target settings.
Reported-by: Hallo32 <Hallo32@xxxxxxx>
Suggested-by: David Sterba <dsterba@xxxxxxx>
Signed-off-by: Qu Wenruo <quwenruo.btrfs@xxxxxxx>
---
Tested with AArch64 cross-toolchain created by buildroot.
---
Makefile | 2 +-
Makefile.inc.in | 1 +
configure.ac | 1 +
3 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/Makefile b/Makefile
index b3e2b636..0395e37f 100644
--- a/Makefile
+++ b/Makefile
@@ -323,7 +323,7 @@ version.h: version.sh version.h.in configure.ac
mktables: kernel-lib/mktables.c
@echo " [CC] $@"
- $(Q)$(CC) $(CFLAGS) $< -o $@
+ $(Q)$(HOSTCC) $(CFLAGS) $< -o $@
kernel-lib/tables.c: mktables
@echo " [TABLE] $@"
diff --git a/Makefile.inc.in b/Makefile.inc.in
index 4e1b68cb..308acca3 100644
--- a/Makefile.inc.in
+++ b/Makefile.inc.in
@@ -4,6 +4,7 @@
export
CC = @CC@
+HOSTCC = @HOSTCC@
LN_S = @LN_S@
AR = @AR@
RM = @RM@
diff --git a/configure.ac b/configure.ac
index 30055f85..f6051ebd 100644
--- a/configure.ac
+++ b/configure.ac
@@ -26,6 +26,7 @@ AC_CONFIG_SRCDIR([btrfs.c])
AC_PREFIX_DEFAULT([/usr/local])
AC_PROG_CC
+AC_PATH_PROGS([HOSTCC], [gcc clang])
AC_CANONICAL_HOST
AC_C_CONST
AC_C_VOLATILE
--
2.14.0
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