-# asm-underscore.m4 serial 1
-dnl Copyright (C) 2010-2011 Free Software Foundation, Inc.
+# asm-underscore.m4 serial 2
+dnl Copyright (C) 2010-2014 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
dnl We don't use GCC's __USER_LABEL_PREFIX__ here, because
dnl 1. It works only for GCC.
dnl 2. It is incorrectly defined on some platforms, in some GCC versions.
+ AC_REQUIRE([gl_C_ASM])
AC_CACHE_CHECK(
[whether C symbols are prefixed with underscore at the linker level],
[gl_cv_prog_as_underscore],
int foo(void) { return 0; }
EOF
# Look for the assembly language name in the .s file.
- AC_TRY_COMMAND(${CC-cc} $CFLAGS $CPPFLAGS -S conftest.c) >/dev/null 2>&1
- if grep _foo conftest.s >/dev/null ; then
+ AC_TRY_COMMAND(${CC-cc} $CFLAGS $CPPFLAGS $gl_c_asm_opt conftest.c) >/dev/null 2>&1
+ if grep _foo conftest.$gl_asmext >/dev/null ; then
gl_cv_prog_as_underscore=yes
else
gl_cv_prog_as_underscore=no
ASM_SYMBOL_PREFIX='"'${USER_LABEL_PREFIX}'"'
AC_SUBST([ASM_SYMBOL_PREFIX])
])
+
+# gl_C_ASM
+# Determines how to produce an assembly language file from C source code.
+# Sets the variables:
+# gl_asmext - the extension of assembly language output,
+# gl_c_asm_opt - the C compiler option that produces assembly language output.
+
+AC_DEFUN([gl_C_ASM],
+[
+ AC_EGREP_CPP([MicrosoftCompiler],
+ [
+#ifdef _MSC_VER
+MicrosoftCompiler
+#endif
+ ],
+ [gl_asmext='asm'
+ gl_c_asm_opt='-c -Fa'
+ ],
+ [gl_asmext='s'
+ gl_c_asm_opt='-S'
+ ])
+])