48 lines
1.7 KiB
Plaintext
48 lines
1.7 KiB
Plaintext
## -*- Autoconf -*-
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# Copyright (C) 1999-2013 Free Software Foundation, Inc.
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#
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# This file is free software; the Free Software Foundation
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# gives unlimited permission to copy and/or distribute it,
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# with or without modifications, as long as this notice is preserved.
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# _AM_PROG_CC_C_O
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# ---------------
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# Like AC_PROG_CC_C_O, but changed for automake. We rewrite AC_PROG_CC
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# to automatically call this.
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AC_DEFUN([_AM_PROG_CC_C_O],
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[AC_REQUIRE([AM_AUX_DIR_EXPAND])dnl
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AC_REQUIRE_AUX_FILE([compile])dnl
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AC_LANG_PUSH([C])dnl
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AC_CACHE_CHECK(
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[whether $CC understands -c and -o together],
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[am_cv_prog_cc_c_o],
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[AC_LANG_CONFTEST([AC_LANG_PROGRAM([])])
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# Make sure it works both with $CC and with simple cc.
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# Following AC_PROG_CC_C_O, we do the test twice because some
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# compilers refuse to overwrite an existing .o file with -o,
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# though they will create one.
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am_cv_prog_cc_c_o=yes
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for am_i in 1 2; do
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if AM_RUN_LOG([$CC -c conftest.$ac_ext -o conftest2.$ac_objext]) \
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&& test -f conftest2.$ac_objext; then
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: OK
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else
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am_cv_prog_cc_c_o=no
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break
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fi
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done
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rm -f core conftest*
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unset am_i])
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if test "$am_cv_prog_cc_c_o" != yes; then
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# Losing compiler, so override with the script.
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# FIXME: It is wrong to rewrite CC.
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# But if we don't then we get into trouble of one sort or another.
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# A longer-term fix would be to have automake use am__CC in this case,
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# and then we could set am__CC="\$(top_srcdir)/compile \$(CC)"
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CC="$am_aux_dir/compile $CC"
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fi
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AC_LANG_POP([C])])
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# For backward compatibility.
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AC_DEFUN_ONCE([AM_PROG_CC_C_O], [AC_REQUIRE([AC_PROG_CC])])
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