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@@ -27,6 +27,9 @@ AC_MSG_NOTICE([dsm ABI version: $BDSM_ABI_VERSION])
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AC_PROG_CC_C99
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AM_PROG_CC_C_O
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+AC_DEFINE([_FORTIFY_SOURCE], 2, [Define to 2 to get glibc warnings.])
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+AC_DEFINE([_FILE_OFFSET_BITS], 64, [Define to 64 for large files support.])
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+
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dnl check for -Wall -Wextra support
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CC_CHECK_CFLAG_APPEND([-Wall -Wsign-compare -Wextra -Wstrict-aliasing -Wstrict-overflow])
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