Commit 0aec613a authored by Nick Mathewson's avatar Nick Mathewson 🎨
Browse files

Add an --enable-pic option for people who hack Tor into libraries

Closes ticket 23846
parent 19dbc385
o Minor features (build):
- If you pass the "--enable-pic" option to configure, Tor will try to
tell the compiler to build position-independent code suitable to
link into a library. (The default remains -fPIE, for code suitable for a
relocatable executable.) Closes ticket 23846.
......@@ -55,6 +55,8 @@ AC_ARG_ENABLE(zstd-advanced-apis,
AS_HELP_STRING(--disable-zstd-advanced-apis, [Build without support for zstd's "static-only" APIs.]))
AC_ARG_ENABLE(nss,
AS_HELP_STRING(--enable-nss, [Use Mozilla's NSS TLS library. (EXPERIMENTAL)]))
AC_ARG_ENABLE(pic,
AS_HELP_STRING(--enable-pic, [Build Tor's binaries as position-independent code, suitable to link as a library.]))
if test "x$enable_coverage" != "xyes" -a "x$enable_asserts_in_tests" = "xno" ; then
AC_MSG_ERROR([Can't disable assertions outside of coverage build])
......@@ -1138,6 +1140,10 @@ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [
#error
#endif])], have_clang=yes, have_clang=no)
if test "x$enable_pic" = "xyes"; then
TOR_CHECK_CFLAGS(-fPIC)
fi
if test "x$enable_gcc_hardening" != "xno"; then
CFLAGS="$CFLAGS -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2"
if test "x$have_clang" = "xyes"; then
......@@ -1157,7 +1163,9 @@ m4_ifdef([AS_VAR_IF],[
TOR_CHECK_CFLAGS(-Wstack-protector)
TOR_CHECK_CFLAGS(--param ssp-buffer-size=1)
if test "$bwin32" = "false" && test "$enable_libfuzzer" != "yes" && test "$enable_oss_fuzz" != "yes"; then
TOR_CHECK_CFLAGS(-fPIE)
if test "$enable_pic" != "yes"; then
TOR_CHECK_CFLAGS(-fPIE)
fi
TOR_CHECK_LDFLAGS(-pie, "$all_ldflags_for_check", "$all_libs_for_check")
fi
TOR_TRY_COMPILE_WITH_CFLAGS(-fwrapv, also_link, CFLAGS_FWRAPV="-fwrapv", true)
......
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