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Build: Add a comment that AC_PROG_CC_C99 is needed for Autoconf 2.69.

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It's obsolete in Autoconf >= 2.70 and just an alias for AC_PROG_CC
but Autoconf 2.69 requires AC_PROG_CC_C99 to get a C99 compiler.
This commit is contained in:
Lasse Collin 2023-03-21 14:07:51 +02:00
parent 53cc475f26
commit 8be136f667
1 changed files with 3 additions and 0 deletions
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configure.ac
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@ -602,6 +602,9 @@ echo "Initializing Automake:"
AM_INIT_AUTOMAKE([1.12 foreign tar-v7 filename-length-max=99 -Wno-unsupported]) AM_INIT_AUTOMAKE([1.12 foreign tar-v7 filename-length-max=99 -Wno-unsupported])
AC_PROG_LN_S AC_PROG_LN_S
dnl # Autoconf >= 2.70 warns that AC_PROG_CC_C99 is obsolete. However,
dnl # we have to keep using AC_PROG_CC_C99 instead of AC_PROG_CC
dnl # as long as we try to be compatible with Autoconf 2.69.
AC_PROG_CC_C99 AC_PROG_CC_C99
if test x$ac_cv_prog_cc_c99 = xno ; then if test x$ac_cv_prog_cc_c99 = xno ; then
AC_MSG_ERROR([No C99 compiler was found.]) AC_MSG_ERROR([No C99 compiler was found.])