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5c28a64e57
Some basic checks we make were placed early enough in generated configure script when using autoconf 2.5X versions. Newer autoconf versions expand these checks much further into the configure script, rendering them useless. Using XC_CONFIGURE_PREAMBLE fixes placement of early intended checks across all our autoconf supported versions.
77 lines
2.0 KiB
Plaintext
77 lines
2.0 KiB
Plaintext
#***************************************************************************
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#***************************************************************************
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# File version for 'aclocal' use. Keep it a single number.
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# serial 7
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dnl CURL_OVERRIDE_AUTOCONF
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dnl -------------------------------------------------
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dnl Placing a call to this macro in configure.ac after
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dnl the one to AC_INIT will make macros in this file
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dnl visible to the rest of the compilation overriding
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dnl those from Autoconf.
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AC_DEFUN([CURL_OVERRIDE_AUTOCONF], [
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AC_BEFORE([$0],[AC_PROG_LIBTOOL])
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# using curl-override.m4
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])
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dnl Override Autoconf's AC_LANG_PROGRAM (C)
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dnl -------------------------------------------------
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dnl This is done to prevent compiler warning
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dnl 'function declaration isn't a prototype'
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dnl in function main. This requires at least
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dnl a c89 compiler and does not suport K&R.
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m4_define([AC_LANG_PROGRAM(C)],
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[$1
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int main (void)
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{
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$2
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;
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return 0;
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}])
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dnl Override Autoconf's AC_LANG_CALL (C)
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dnl -------------------------------------------------
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dnl This is a backport of Autoconf's 2.60 with the
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dnl embedded comments that hit the resulting script
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dnl removed. This is done to reduce configure size
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dnl and use fixed macro across Autoconf versions.
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m4_define([AC_LANG_CALL(C)],
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[AC_LANG_PROGRAM([$1
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m4_if([$2], [main], ,
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[
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#ifdef __cplusplus
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extern "C"
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#endif
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char $2 ();])], [return $2 ();])])
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dnl Override Autoconf's AC_LANG_FUNC_LINK_TRY (C)
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dnl -------------------------------------------------
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dnl This is a backport of Autoconf's 2.60 with the
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dnl embedded comments that hit the resulting script
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dnl removed. This is done to reduce configure size
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dnl and use fixed macro across Autoconf versions.
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m4_define([AC_LANG_FUNC_LINK_TRY(C)],
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[AC_LANG_PROGRAM(
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[
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#define $1 innocuous_$1
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#ifdef __STDC__
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# include <limits.h>
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#else
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# include <assert.h>
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#endif
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#undef $1
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#ifdef __cplusplus
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extern "C"
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#endif
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char $1 ();
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#if defined __stub_$1 || defined __stub___$1
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choke me
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#endif
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], [return $1 ();])])
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