mirror of
git://git.sv.gnu.org/autoconf
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106 lines
2.3 KiB
Plaintext
106 lines
2.3 KiB
Plaintext
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# -*- autoconf -*-
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cat <<EOF
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Low level compiling/preprocessing macros.
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EOF
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# Since the macros which compile are required by most tests, check
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# them first. But remember that looking for a compiler is even more
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# primitive, so check those first.
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## ------------ ##
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## C keywords. ##
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## ------------ ##
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# GCC supports `const', `volatile', and `inline'.
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AT_CHECK_MACRO([C keywords],
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[[AC_PROG_CC
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AC_C_CONST
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AC_C_INLINE
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AC_C_VOLATILE
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case "$GCC,$ac_cv_c_const,$ac_cv_c_inline,$ac_cv_c_volatile" in
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yes,*no*)
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AC_MSG_ERROR([failed to detect `const', `inline' or `volatile' support]);;
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esac]])
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## --------------------------- ##
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## AC_PROG_CPP with warnings. ##
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## --------------------------- ##
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# It's Ok for strict preprocessors to produce warnings.
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AT_SETUP([AC_PROG_CPP with warnings])
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AT_DATA([mycpp],
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[[#! /bin/sh
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echo noise >&2
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exec ${1+"$@"}
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]])
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chmod +x mycpp
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_AT_CHECK_AC_MACRO(
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[AC_PROG_CPP
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# If the preprocessor is not strict, just ignore
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test "x$ac_c_preproc_warn_flag" = xyes &&
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AC_MSG_ERROR([preprocessor has no warning option], 77)
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CPP="./mycpp $CPP"
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AC_CHECK_HEADERS(stdio.h autoconf_io.h)])
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AT_CHECK_DEFINES(
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[/* #undef HAVE_AUTOCONF_IO_H */
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#define HAVE_STDIO_H 1
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])
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AT_CLEANUP(configure config.status config.log config.cache config.hin config.h env-after)dnl
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## ------------------------------ ##
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## AC_PROG_CPP without warnings. ##
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## ------------------------------ ##
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AT_SETUP([AC_PROG_CPP without warnings])
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AT_DATA([mycpp],
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[[#! /bin/sh
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/lib/cpp ${1+"$@"}
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exit 0
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]])
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chmod +x mycpp
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_AT_CHECK_AC_MACRO(
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[# Ignore if /lib/cpp doesn't work
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/lib/cpp </dev/null >/dev/null 2>&1 ||
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AC_MSG_ERROR([preprocessor doesn't work], 77)
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CPP=./mycpp
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AC_PROG_CPP
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test "x$ac_c_preproc_warn_flag" != xyes &&
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AC_MSG_ERROR([failed to detect preprocessor warning option])
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AC_CHECK_HEADERS(stdio.h autoconf_io.h)])
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AT_CHECK_DEFINES(
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[/* #undef HAVE_AUTOCONF_IO_H */
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#define HAVE_STDIO_H 1
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])
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AT_CLEANUP(configure config.status config.log config.cache config.hin config.h env-after)dnl
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## ------------------ ##
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## AC_TRY_LINK_FUNC. ##
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## ------------------ ##
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AT_CHECK_MACRO([AC_TRY_LINK_FUNC],
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[AC_TRY_LINK_FUNC(exit,,
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[AC_MSG_ERROR([cannot find `exit'])])
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AC_TRY_LINK_FUNC(Be_doomed_if_your_libc_has_a_function_named_like_this,
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[AC_MSG_ERROR([found a nonexistent function])])])
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