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configure.ac
@@ -23,7 +23,15 @@ AC_PATH_TOOL(AR, ar)
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AC_PATH_TOOL(RANLIB, ranlib)
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AC_PATH_TOOL(STRIP, strip)
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+# Save definition of AC_PROG_CC because AM_PROG_CC_C_O in automake<=1.13 will
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+# redefine AC_PROG_CC to exit with an error, which avoids the user calling it
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+# accidently and screwing up the effect of AM_PROG_CC_C_O. However, we'll need
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+# AC_PROG_CC later on in AX_PROG_CC_FOR_BUILD, where its usage is fine, and
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+# we'll carefully make sure not to call AC_PROG_CC anywhere else.
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+m4_copy([AC_PROG_CC], [saved_AC_PROG_CC])
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AM_PROG_CC_C_O
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+# Restore AC_PROG_CC
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+m4_rename_force([saved_AC_PROG_CC], [AC_PROG_CC])
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AC_PROG_CC_C89
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if test x"$ac_cv_prog_cc_c89" = x"no"; then
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