configure.ac: also try -std=c99
If -std=c17 and -std=c11 don't work, try -std=c99 as well. -std=c90 is unlikely to work because of the requirement for "long long" on L32 platforms, which isn't likely to be supported on a pure C90 compiler. Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
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@ -29,7 +29,8 @@ AC_SYS_LARGEFILE
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AC_PROG_CC
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AC_PROG_CC
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AC_PROG_CC_STDC
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AC_PROG_CC_STDC
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PA_ADD_CFLAGS([-std=c17], [], [],
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PA_ADD_CFLAGS([-std=c17], [], [],
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[PA_ADD_CFLAGS([-std=c11])])
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[PA_ADD_CFLAGS([-std=c11], [], [],
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[PA_ADD_CFLAGS([-std=c99])])])
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dnl If the user did not specify a CFLAGS default, change default
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dnl If the user did not specify a CFLAGS default, change default
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dnl to -O0 for debugging
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dnl to -O0 for debugging
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