From ea008a754fd6b24ef545329abea9431d5a5d18b0 Mon Sep 17 00:00:00 2001
From: midipix <writeonce@midipix.org>
Date: Dec 23 2018 00:14:28 +0000
Subject: project: custom config: test for x87, x64, and IEEE properties at config time.


---

diff --git a/config/x86_64-linux/pyconfig.h b/config/x86_64-linux/pyconfig.h
index bd82e42..90430d2 100644
--- a/config/x86_64-linux/pyconfig.h
+++ b/config/x86_64-linux/pyconfig.h
@@ -5,8 +5,6 @@
 #include "osapi/rtld.h"
 #include "osapi/linux.h"
 #include "osapi/overrides.h"
-#include "toolchain/64-default.h"
-#include "toolchain/64-le-ieee.h"
 
 /* cf. Modules/posixmodule.c */
 #define HAVE_BROKEN_NICE 1
diff --git a/config/x86_64-midipix/pyconfig.h b/config/x86_64-midipix/pyconfig.h
index 87740b2..72f12fd 100644
--- a/config/x86_64-midipix/pyconfig.h
+++ b/config/x86_64-midipix/pyconfig.h
@@ -4,8 +4,6 @@
 #include "osapi/modern.h"
 #include "osapi/rtld.h"
 #include "osapi/midipix.h"
-#include "toolchain/64-default.h"
-#include "toolchain/64-le-ieee.h"
 
 /* cf. Modules/posixmodule.c */
 #define HAVE_BROKEN_NICE 1
diff --git a/profiles/toolchain/64-default.h b/profiles/toolchain/64-default.h
deleted file mode 100644
index e39b71a..0000000
--- a/profiles/toolchain/64-default.h
+++ /dev/null
@@ -1,7 +0,0 @@
-#ifndef PY_TOOLCHAIN_64_DEFAULT_H
-#define PY_TOOLCHAIN_64_DEFAULT_H
-
-#define HAVE_GCC_ASM_FOR_X87            1
-#define HAVE_GCC_ASM_FOR_X64            1
-
-#endif
diff --git a/profiles/toolchain/64-le-ieee.h b/profiles/toolchain/64-le-ieee.h
deleted file mode 100644
index d982677..0000000
--- a/profiles/toolchain/64-le-ieee.h
+++ /dev/null
@@ -1,6 +0,0 @@
-#ifndef PY_TOOLCHAIN_64_LE_IEEE_H
-#define PY_TOOLCHAIN_64_LE_IEEE_H
-
-#define DOUBLE_IS_LITTLE_ENDIAN_IEEE754 1
-
-#endif
diff --git a/project/config/cfgdefs.sh b/project/config/cfgdefs.sh
index 560afa6..adbfc33 100644
--- a/project/config/cfgdefs.sh
+++ b/project/config/cfgdefs.sh
@@ -141,6 +141,50 @@ cfgdefs_perform_common_tests()
 	mb_cfgtest_headers='pthread.h'
 	cfgtest_type_size 'pthread_t'
 
+	# toolchain
+	cfgtest_newline
+	cfgtest_comment 'toolchain'
+
+	# x87
+	mb_code_snippet=''
+	mb_code_snippet="$mb_code_snippet "'void fn(void)'
+	mb_code_snippet="$mb_code_snippet "'{__asm__ __volatile__ ("fnstcw pcw");'
+	mb_code_snippet="$mb_code_snippet "' __asm__ __volatile__ ("fldcw  pcw");}'
+
+	if cfgtest_code_snippet "$mb_code_snippet"; then
+		cfgtest_cflags_append '-DHAVE_GCC_ASM_FOR_X87'
+	fi
+
+	# x64
+	mb_code_snippet=''
+	mb_code_snippet="$mb_code_snippet "'void fn(void)'
+	mb_code_snippet="$mb_code_snippet "'{__asm__ __volatile__ ("callq *%rax");}'
+
+	if cfgtest_code_snippet "$mb_code_snippet"; then
+		cfgtest_cflags_append '-DHAVE_GCC_ASM_FOR_X64'
+	fi
+
+	# IEEE 754: little endian / big endian
+	if $mb_cfgtest_cc -E -dM - < /dev/null \
+			| grep '__BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__' \
+			> /dev/null; then
+		cfgtest_cflags_append '-DDOUBLE_IS_LITTLE_ENDIAN_IEEE754'
+
+	elif $mb_cfgtest_cc -E -dM - < /dev/null \
+			| grep '__BYTE_ORDER__ __ORDER_BIG_ENDIAN__' \
+			> /dev/null; then
+		cfgtest_cflags_append '-DDOUBLE_IS_BIG_ENDIAN_IEEE754'
+
+	else
+		cfgtest_newline
+		cfgtest_comment 'cfgdefs.sh: cannot detect little/big endian,'
+		cfgtest_comment 'cfgtest.sh: so defined both macros below.'
+		cfgtest_newline
+
+		cfgtest_cflags_append '-DDOUBLE_IS_LITTLE_ENDIAN_IEEE754'
+		cfgtest_cflags_append '-DDOUBLE_IS_BIG_ENDIAN_IEEE754'
+	fi
+
 	# getrandom: easier to simply test,
 	# than to test whether we need to test
 	# (and then test).