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From d3920dce139734e00bbe4447a16ef24dfe4d704a Mon Sep 17 00:00:00 2001
From: Eric Le Bihan <eric.le.bihan.dev@free.fr>
Date: Tue, 10 Oct 2017 19:51:02 +0200
Subject: [PATCH] No runtime tests for endianness
Replace build and execution of runtime test programs for determining
the endianness of the target with compile time test programs.
This improves support for cross-compilation.
Signed-off-by: Eric Le Bihan <eric.le.bihan.dev@free.fr>
---
configure | 13 ++++++++++---
src/sysdeps/trybigendian.c | 16 ++++++++++++++++
src/sysdeps/trylittleendian.c | 19 +++++++++++++++++++
3 files changed, 45 insertions(+), 3 deletions(-)
create mode 100644 src/sysdeps/trybigendian.c
create mode 100644 src/sysdeps/trylittleendian.c
diff --git a/configure b/configure
index f34dcd0..f2a77f3 100755
--- a/configure
+++ b/configure
@@ -478,12 +478,19 @@ EOF
exec 3>&-
echo "Checking system endianness..."
- $CC_AUTO $CPPFLAGS_AUTO $CPPFLAGS $CPPFLAGS_POST $CFLAGS_AUTO $CFLAGS $CFLAGS_POST $LDFLAGS_AUTO $LDFLAGS $LDFLAGS_POST -o tryendianness src/sysdeps/tryendianness.c
- endianness=$(./tryendianness) || fail "$0: unable to determine endianness"
+ if $CC_AUTO $CPPFLAGS_AUTO $CPPFLAGS $CPPFLAGS_POST $CFLAGS_AUTO $CFLAGS $CFLAGS_POST $LDFLAGS_AUTO $LDFLAGS $LDFLAGS_POST -o trybigendian src/sysdeps/trybigendian.c 2>/dev/null; then
+ endianness=big
+ else
+ if $CC_AUTO $CPPFLAGS_AUTO $CPPFLAGS $CPPFLAGS_POST $CFLAGS_AUTO $CFLAGS $CFLAGS_POST $LDFLAGS_AUTO $LDFLAGS $LDFLAGS_POST -o trylittleendian src/sysdeps/trylittleendian.c 2>/dev/null; then
+ endianness=little
+ else
+ fail "$0: unable to determine endianness"
+ fi
+ fi
echo "endianness: $endianness" >> $sysdeps/sysdeps
echo "#define ${package_macro_name}_ENDIANNESS \"$endianness\"" >> $sysdeps/sysdeps.h
echo " ... $endianness"
- rm -f tryendianness
+ rm -f trybigendian trylittleendian
trytypes
choose clr accept4 ACCEPT4 'accept4()'
diff --git a/src/sysdeps/trybigendian.c b/src/sysdeps/trybigendian.c
new file mode 100644
index 0000000..d857572
--- /dev/null
+++ b/src/sysdeps/trybigendian.c
@@ -0,0 +1,16 @@
+#if defined(__BYTE_ORDER) && (__BYTE_ORDER == __BIG_ENDIAN) || \
+ defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__) || \
+ defined(__BIG_ENDIAN) || \
+ defined(__ARMEB__) || \
+ defined(__THUMBEB__) || \
+ defined(__AARCH64EB__) || \
+ defined(_MIPSEB) || defined(__MIPSEB) || defined(__MIPSEB__)
+#define YEAH
+#else
+#error "not big endian"
+#endif
+
+int main(void)
+{
+ return 0;
+}
diff --git a/src/sysdeps/trylittleendian.c b/src/sysdeps/trylittleendian.c
new file mode 100644
index 0000000..68b93c1
--- /dev/null
+++ b/src/sysdeps/trylittleendian.c
@@ -0,0 +1,19 @@
+#if defined(__BYTE_ORDER) && (__BYTE_ORDER == __LITTLE_ENDIAN) || \
+ defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) || \
+ defined(__LITTLE_ENDIAN) || \
+ defined(__ARMEL__) || \
+ defined(__THUMBEL__) || \
+ defined(__AARCH64EL__) || \
+ defined(__i386) || defined(__i386__) || \
+ defined(__amd64) || defined(__amd64__) || \
+ defined(__x86_64) || defined(__x86_64__) || \
+ defined(_MIPSEL) || defined(__MIPSEL) || defined(__MIPSEL__)
+#define YEAH
+#else
+#error "not little endian"
+#endif
+
+int main(void)
+{
+ return 0;
+}
--
2.13.6
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