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From: Helmut Grohne <helmut@subdivi.de>
Subject: improve cross buildability
* Rather than checking $build (the architecture we are building on), we should
be checking $host. Unfortunately, $host tends to lack the vendor part, so we
need a tricky sed expression for inserting it. For native builds, $host and
$build are equal.
* The check for whether sem_init works only aborts the build in case of
failure. Since the check cannot be performed during cross building, the only
sane way is to just assume sem_init to work.
* Replace a pile of AC_RUN_IFELSE with AC_CHECK_SIZEOF and AC_CHECK_ALIGNOF.
The latter macros have a slower fallback path for cross compilation that use
compiler bisection to determine the values.
--- a/configure.ac
+++ b/configure.ac
@@ -85,7 +85,11 @@ STD_EDITLINE=false
dnl Test for special ar options?
AR_OPT_CHECK=false
-case "$build" in
+if test -z "$host" ; then host="$build"; fi
+
+host_quadruplet=$(echo "$host" | sed 's/^\(@<:@^-@:>@*\)-\(@<:@^-@:>@*\)-\(@<:@^-@:>@*\)$/\1-pc-\2-\3/')
+echo "considering >$build< >$host< >$host_quadruplet<"
+case "$host_quadruplet" in
aarch64-*-darwin*)
MAKEFILE_PREFIX=darwin_aarch64
MAKEFILE_POSTFIX=darwin
@@ -162,7 +166,7 @@ dnl CPU_TYPE=ppc64
amd64-*-freebsd* | x86_64*-*-freebsd* | x86_64*-*-k*bsd*-gnu)
MAKEFILE_PREFIX=freebsd_amd64
- case "$build" in
+ case "$host_quadruplet" in
x86_64*-*-k*bsd-gnu) # Debian/kFreeBSD
PLATFORM=GENTOOFREEBSD
INSTALL_PREFIX=linux
@@ -562,7 +566,7 @@ dnl CPU_TYPE=ppc64
;;
*)
- AC_MSG_ERROR(unsupported platform ${build})
+ AC_MSG_ERROR(unsupported platform ${host_quadruplet})
;;
esac
@@ -1045,7 +1049,8 @@ AC_RUN_IFELSE([AC_LANG_SOURCE([[#include
}
]])],[AC_DEFINE(WORKING_SEM_INIT,1,[Define this if sem_init() works on the platform])
AC_MSG_RESULT(yes)],[AC_MSG_RESULT(no)
-AC_SEARCH_LIBS(sem_open, rt pthread)],[])
+AC_SEARCH_LIBS(sem_open, rt pthread)],[AC_DEFINE(WORKING_SEM_INIT,1)
+AC_MSG_RESULT([assuming yes (cross compiling)])])
fi
fi
@@ -1070,12 +1075,10 @@ AC_TYPE_SIZE_T
AC_TYPE_UID_T
AC_SYS_LARGEFILE
if test "$ac_cv_sys_file_offset_bits" = "no"; then
- AC_MSG_CHECKING(for native large file support)
- AC_RUN_IFELSE([AC_LANG_SOURCE([[#include <unistd.h>
- int main () {
- return !(sizeof(off_t) == 8);
- }]])],[ac_cv_sys_file_offset_bits=64; AC_DEFINE(_FILE_OFFSET_BITS,64)
- AC_MSG_RESULT(yes)],[AC_MSG_RESULT(no)],[])
+ AC_CHECK_SIZEOF([off_t],[],[#include <unistd.h>])
+ if test "$ac_cv_sizeof_off_t" = 8; then
+ ac_cv_sys_file_offset_bits=64; AC_DEFINE(_FILE_OFFSET_BITS,64)
+ fi
fi
AC_CHECK_SIZEOF(void *)
@@ -1108,27 +1111,17 @@ AC_CHECK_MEMBER([struct dirent.d_type],
dnl EKU: try to determine the alignment of long and double
dnl replaces FB_ALIGNMENT and FB_DOUBLE_ALIGN in src/jrd/common.h
-AC_MSG_CHECKING(alignment of long)
-AC_RUN_IFELSE([AC_LANG_SOURCE([[#include <semaphore.h>
-int main () {
- struct s {
- char a;
- union { long long x; sem_t y; } b;
- };
- return (int)&((struct s*)0)->b;
-}]])],[ac_cv_c_alignment=$ac_status],[ac_cv_c_alignment=$ac_status],[])
-AC_MSG_RESULT($ac_cv_c_alignment)
+AC_CHECK_ALIGNOF([long long])
+AC_CHECK_ALIGNOF([sem_t],[#include <semaphore.h>])
+if test "$ac_cv_alignof_long_long" -gt "$ac_cv_alignof_sem_t"; then
+ ac_cv_c_alignment=$ac_cv_alignof_long_long
+else
+ ac_cv_c_alignment=$ac_cv_alignof_sem_t
+fi
AC_DEFINE_UNQUOTED(FB_ALIGNMENT, $ac_cv_c_alignment, [Alignment of long])
-AC_MSG_CHECKING(alignment of double)
-AC_RUN_IFELSE([AC_LANG_SOURCE([[int main () {
- struct s {
- char a;
- double b;
- };
- return (int)&((struct s*)0)->b;
-}]])],[ac_cv_c_double_align=$ac_status],[ac_cv_c_double_align=$ac_status],[])
-AC_MSG_RESULT($ac_cv_c_double_align)
+AC_CHECK_ALIGNOF([double])
+ac_cv_c_double_align=$ac_cv_alignof_double
AC_DEFINE_UNQUOTED(FB_DOUBLE_ALIGN, $ac_cv_c_double_align, [Alignment of double])
dnl EKU: Add any platform specific tests below
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