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build: Add workaround for automake 1.13 and older 

Fixes #890.
This commit is contained in:
Tim Ruffing 2021-02-01 22:54:09 +01:00
parent 24d1656c32
commit f329bba244
1 changed files with 8 additions and 0 deletions
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8
configure.ac
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@ -23,7 +23,15 @@ AC_PATH_TOOL(AR, ar)
AC_PATH_TOOL(RANLIB, ranlib)
AC_PATH_TOOL(STRIP, strip)
# Save definition of AC_PROG_CC because AM_PROG_CC_C_O in automake<=1.13 will
# redefine AC_PROG_CC to exit with an error, which avoids the user calling it
# accidently and screwing up the effect of AM_PROG_CC_C_O. However, we'll need
# AC_PROG_CC later on in AX_PROG_CC_FOR_BUILD, where its usage is fine, and
# we'll carefully make sure not to call AC_PROG_CC anywhere else.
m4_copy([AC_PROG_CC], [saved_AC_PROG_CC])
AM_PROG_CC_C_O
# Restore AC_PROG_CC
m4_rename_force([saved_AC_PROG_CC], [AC_PROG_CC])
AC_PROG_CC_C89
if test x"$ac_cv_prog_cc_c89" = x"no"; then