From: Samuel Martin <s.martin49@gmail.com>
Date: Tue, 4 Jul 2017 11:09:20 -0400
Subject: [PATCH] auto/type/sizeof: rework autotest to be cross-compilation
 friendly

Rework the sizeof test to do the checks at compile time instead of at
runtime. This way, it does not break when cross-compiling for a
different CPU architecture.

Signed-off-by: Samuel Martin <s.martin49@gmail.com>

Refresh for 1.8.0.

Signed-off-by: Danomi Manchego <danomimanchego123@gmail.com>
[martin@barkynet.com: Updated for 1.10.0]
Signed-off-by: Martin Bark <martin@barkynet.com>
Signed-off-by: Adam Duskett <Adamduskett@outlook.com>
Refresh for 1.12.0
---
 auto/types/sizeof | 37 ++++++++++++++++++++++++++++---------
 1 file changed, 28 insertions(+), 9 deletions(-)

diff --git a/auto/types/sizeof b/auto/types/sizeof
index 480d8cfa49aa..61dcd2de5d44 100644
--- a/auto/types/sizeof
+++ b/auto/types/sizeof
@@ -14,7 +14,7 @@ END
 
 ngx_size=
 
-cat << END > $NGX_AUTOTEST.c
+cat << _EOF > $NGX_AUTOTEST.c
 
 #include <sys/types.h>
 #include <sys/time.h>
@@ -25,22 +25,41 @@ $NGX_INCLUDE_UNISTD_H
 $NGX_INCLUDE_INTTYPES_H
 $NGX_INCLUDE_AUTO_CONFIG_H
 
-int main(void) {
-    printf("%d", (int) sizeof($ngx_type));
+#if !defined( PASTE)
+#define PASTE2( x, y) x##y
+#define PASTE( x, y)  PASTE2( x, y)
+#endif /* PASTE */
+
+#define SAY_IF_SIZEOF( typename, type, size)   \\
+    static char PASTE( PASTE( PASTE( sizeof_, typename), _is_), size) \\
+    [(sizeof(type) == (size)) ? 1 : -1]
+
+SAY_IF_SIZEOF(TEST_TYPENAME, TEST_TYPE, TEST_SIZE);
+
+int main(void)
+{
     return 0;
 }
 
-END
+_EOF
 
 
-ngx_test="$CC $CC_TEST_FLAGS $CC_AUX_FLAGS \
-          -o $NGX_AUTOTEST $NGX_AUTOTEST.c $NGX_LD_OPT $ngx_feature_libs"
+_ngx_typename=`echo "$ngx_type" | sed 's/ /_/g;s/\*/p/'`
+ngx_size="-1"
+ngx_size=`for i in 1 2 4 8 16 ; do \
+    $CC $CC_TEST_FLAGS $CC_AUX_FLAGS \
+    -DTEST_TYPENAME="$_ngx_typename" -DTEST_TYPE="$ngx_type" -DTEST_SIZE="$i" \
+    $NGX_AUTOTEST.c -o $NGX_AUTOTEST \
+    $NGX_LD_OPT $ngx_feature_libs >/dev/null 2>&1 || continue ;\
+    echo $i ; break ; done`
 
-eval "$ngx_test >> $NGX_AUTOCONF_ERR 2>&1"
+rm -rf $NGX_AUTOTEST*
 
+if test -z $ngx_size ; then
+    ngx_size=-1
+fi
 
-if [ -x $NGX_AUTOTEST ]; then
-    ngx_size=`$NGX_AUTOTEST`
+if [ $ngx_size -gt 0 ]; then
     echo " $ngx_size bytes"
 fi