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annotate configure.ac @ 1427:f0e262a46d4e

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set hardened compiler/linker flags by default
author Matt Johnston <matt@ucc.asn.au>
date Sat, 24 Jun 2017 00:42:20 +0800
parents 89f8c5960527
children 69862e8cc405 a097c9c9608a
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1 # -*- Autoconf -*-
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2 # Process this file with autoconf and autoheader to produce a configure script.
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4 # This Autoconf file was cobbled from various locations. In particular, a bunch
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5 # of the platform checks have been taken straight from OpenSSH's configure.ac
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6 # Huge thanks to them for dealing with the horrible platform-specifics :)
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7
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8 AC_PREREQ(2.59)
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9 AC_INIT
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10 AC_CONFIG_SRCDIR(buffer.c)
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12 OLDCFLAGS="$CFLAGS"
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13 # Checks for programs.
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14 AC_PROG_CC
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15 AC_PROG_MAKE_SET
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16
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17 if test -z "$LD" ; then
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18 LD=$CC
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19 fi
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20 AC_SUBST(LD)
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21
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22 # set compile flags prior to other tests
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23 if test -z "$OLDCFLAGS" && test "$GCC" = "yes"; then
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24 AC_MSG_NOTICE(No \$CFLAGS set... using "-Os -W -Wall" for GCC)
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25 CFLAGS="-Os -W -Wall -Wno-pointer-sign"
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26 fi
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28 AC_MSG_CHECKING([if compiler '$CC' supports -fno-strict-overflow])
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29 OLDCFLAGS="$CFLAGS"
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30 CFLAGS="$CFLAGS -fno-strict-overflow"
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31 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])],
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32 [AC_MSG_RESULT(yes)],
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33 [AC_MSG_RESULT(no); CFLAGS="$OLDCFLAGS" ]
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34 )
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35
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36 hardenbuild=1
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37 AC_ARG_ENABLE(harden,
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38 [ --disable-harden Don't set hardened build flags],
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39 [
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40 if test "x$enableval" = "xno"; then
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41 hardenbuild=0
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42 AC_MSG_NOTICE(Disabling hardened build flags)
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43 fi
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44 ], [])
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45
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46 if test "$hardenbuild" -eq 1; then
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47 AC_MSG_NOTICE(Checking for available hardened build flags:)
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48 # pie
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49 OLDCFLAGS="$CFLAGS"
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50 TESTFLAGS="-fPIE"
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51 CFLAGS="$CFLAGS $TESTFLAGS"
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52 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])],
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53 [AC_MSG_NOTICE([Setting $TESTFLAGS])],
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54 [AC_MSG_NOTICE([Not setting $TESTFLAGS]); CFLAGS="$OLDCFLAGS" ]
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55 )
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56 OLDLDFLAGS="$LDFLAGS"
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57 TESTFLAGS="-Wl,-pie"
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58 LDFLAGS="$LDFLAGS $TESTFLAGS"
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59 AC_LINK_IFELSE([AC_LANG_PROGRAM([])],
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60 [AC_MSG_NOTICE([Setting $TESTFLAGS])],
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61 [AC_MSG_NOTICE([Not setting $TESTFLAGS]); LDFLAGS="$OLDLDFLAGS" ]
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62 )
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63 # readonly elf relocation sections (relro)
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64 OLDLDFLAGS="$LDFLAGS"
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65 TESTFLAGS="-Wl,-z,now -Wl,-z,relro"
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66 LDFLAGS="$LDFLAGS $TESTFLAGS"
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67 AC_LINK_IFELSE([AC_LANG_PROGRAM([])],
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68 [AC_MSG_NOTICE([Setting $TESTFLAGS])],
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69 [AC_MSG_NOTICE([Not setting $TESTFLAGS]); LDFLAGS="$OLDLDFLAGS" ]
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70 )
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71 # stack protector. -strong is good but only in gcc 4.9 or later
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72 OLDCFLAGS="$CFLAGS"
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73 TESTFLAGS="-fstack-protector-strong"
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74 CFLAGS="$CFLAGS $TESTFLAGS"
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75 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])],
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76 [AC_MSG_NOTICE([Setting $TESTFLAGS])],
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77 [
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78 CFLAGS="$OLDCFLAGS"
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79 TESTFLAGS="-fstack-protector --param=ssp-buffer-size=4"
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80 CFLAGS="$CFLAGS $TESTFLAGS"
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81 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])],
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82 [AC_MSG_NOTICE([Setting $TESTFLAGS])],
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