With MSVC/clang, the configure output contains:
checking whether C symbols are prefixed with underscore at the linker
level... /usr/bin/grep: conftest.asm: No such file or directory
no
This patch fixes it.
2020-08-15 Bruno Haible <br...@clisp.org>
Determine asm output option and filename suffix for MSVC/clang.
* m4/asm-underscore.m4 (gl_C_ASM): Distinguish clang from cl and
clang-cl.
diff --git a/m4/asm-underscore.m4 b/m4/asm-underscore.m4
index 09be5ee..6446e71 100644
--- a/m4/asm-underscore.m4
+++ b/m4/asm-underscore.m4
@@ -1,4 +1,4 @@
-# asm-underscore.m4 serial 4
+# asm-underscore.m4 serial 5
dnl Copyright (C) 2010-2020 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -63,8 +63,19 @@ AC_DEFUN([gl_C_ASM],
MicrosoftCompiler
#endif
],
- [gl_asmext='asm'
- gl_c_asm_opt='-c -Fa'
+ [dnl Microsoft's 'cl' and 'clang-cl' produce an .asm file, whereas 'clang'
+ dnl produces a .s file. Need to distinguish 'clang' and 'clang-cl'.
+ rm -f conftest*
+ echo 'int dummy;' > conftest.c
+ AC_TRY_COMMAND(${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c) >/dev/null 2>&1
+ if test -f conftest.o; then
+ gl_asmext='s'
+ gl_c_asm_opt='-S'
+ else
+ gl_asmext='asm'
+ gl_c_asm_opt='-c -Fa'
+ fi
+ rm -f conftest*
],
[gl_asmext='s'
gl_c_asm_opt='-S'
