From a60a18880ecd3549aaafbb199abb6d159a4941a1 Mon Sep 17 00:00:00 2001
From: Adrian Thurston <thurston@colm.net>
Date: Thu, 19 Dec 2019 16:14:10 +0200
Subject: testing: added a configure check for ASM tests

Addded a configure check to see if the ASM tests are appropriate. If we can
build a basic ASM file with .rodata references, assume we can run the tests.
---
 configure.ac             | 44 ++++++++++++++++++++++++++++++++++++++++++--
 test/ragel.d/gentests.sh |  3 ++-
 2 files changed, 44 insertions(+), 3 deletions(-)

diff --git a/configure.ac b/configure.ac
index 1d34b74e..88d8493c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -262,19 +262,58 @@ AC_PATH_PROG([RUST_BIN], [rustc])
 AC_PATH_PROG([JULIA_BIN], [julia])
 AC_PATH_PROG([GNUSTEP_CONFIG], [gnustep-config])
 
+dnl
+dnl Julia requires a large virtual address space. On systems where this is
+dnl limited by ulimit, julia will fail to run.
+dnl
+
 if test "x$JULIA_BIN" != x; then
-	echo -n "checking if julia is able to run programs ... "
 	echo 'println( "can run julia programs" );' > conftest.jl
+	echo -n "checking if julia is able to run programs ... "
 	if sh -c "$JULIA_BIN conftest.jl" >>config.log 2>&1; then
 		echo "yes"
 	else
-		echo "FAILED to run julia program" >> config.log
 		echo "no"
 		JULIA_BIN=""
 	fi
 	rm -f conftest.jl
 fi
 
+dnl
+dnl The ASM tests have been based off of sources that are non-relocatable
+dnl These won't assemble on some systems (with the right architecture). Check
+dnl our specific flavour of ASM now so we can avoid some test failures.
+dnl
+
+ASM_BIN=$CC
+
+cat <<\EOF > conftest.s
+.section .rodata
+.L_works:
+.string "works"
+
+.text
+.globl	main
+main:
+	pushq	%rbp
+	movq	%rsp, %rbp
+	pushq	%rdi
+	movq	$.L_works, %rdi
+	call	puts
+	popq	%rdi
+	mov	$0, %rax
+	ret
+EOF
+
+echo -n "checking if ragel ASM tests will build ... "
+if sh -c "$ASM_BIN -o conftest.bin conftest.s" >>config.log 2>&1; then
+	echo "yes"
+else
+	echo "no"
+	ASM_BIN=""
+fi
+rm -f conftest.s
+
 SED_SUBST="$SED_SUBST -e 's|@D_BIN@|${D_BIN}|g'"
 SED_SUBST="$SED_SUBST -e 's|@JAVAC_BIN@|${JAVAC_BIN}|g'"
 SED_SUBST="$SED_SUBST -e 's|@RUBY_BIN@|${RUBY_BIN}|g'"
@@ -284,6 +323,7 @@ SED_SUBST="$SED_SUBST -e 's|@OCAML_BIN@|${OCAML_BIN}|g'"
 SED_SUBST="$SED_SUBST -e 's|@RUST_BIN@|${RUST_BIN}|g'"
 SED_SUBST="$SED_SUBST -e 's|@JULIA_BIN@|${JULIA_BIN}|g'"
 SED_SUBST="$SED_SUBST -e 's|@GNUSTEP_CONFIG@|${GNUSTEP_CONFIG}|g'"
+SED_SUBST="$SED_SUBST -e 's|@ASM_BIN@|${ASM_BIN}|g'"
 
 AC_ARG_WITH(crack,
 	[AC_HELP_STRING([--with-crack], [location of crack install])],
diff --git a/test/ragel.d/gentests.sh b/test/ragel.d/gentests.sh
index 941ef448..86c81da2 100644
--- a/test/ragel.d/gentests.sh
+++ b/test/ragel.d/gentests.sh
@@ -108,6 +108,7 @@ rust_compiler="@RUST_BIN@"
 crack_interpreter="@CRACK_BIN@"
 julia_interpreter="@JULIA_BIN@"
 gnustep_config="@GNUSTEP_CONFIG@"
+assembler="@ASM_BIN@"
 
 if [ -z "$gnustep_config" ]; then
 	objc_compiler=""
@@ -260,7 +261,7 @@ function lang_opts()
 			lang_opt="--asm"
 			code_suffix=s
 			interpreted=false
-			compiler="gcc"
+			compiler="$assembler"
 			host_ragel=$RAGEL_ASM_BIN
 			flags=""
 			libs=""
-- 
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