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Undefine _FORTIFY_SOURCE before defining it.

This makes our compilation options checks in autoconf work better on
systems that already define _FORTIFY_SOURCE.

Fixes at least one case of bug 18841; bugfix on 0.2.3.17-beta. Patch
from "trudokal".
Nick Mathewson 8 lat temu
rodzic
commit
c662bef455
2 zmienionych plików z 8 dodań i 1 usunięć
  1. 7 0
      changes/bug18841.1
  2. 1 1
      configure.ac

+ 7 - 0
changes/bug18841.1

@@ -0,0 +1,7 @@
+  o Major bugfixes (compilation):
+    - Correctly detect compiler flags on systems where _FORTIFY_SOURCE
+      is predefined. Previously, our use of -D_FORTIFY_SOURCE would
+      cause a compiler warning, thereby making other checks fail.
+      Fixes one case of bug 18841; bugfix on 0.2.3.17-beta. Patch from
+      "trudokal".
+

+ 1 - 1
configure.ac

@@ -623,7 +623,7 @@ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [
 #endif])], have_clang=yes, have_clang=no)
 
 if test x$enable_gcc_hardening != xno; then
-    CFLAGS="$CFLAGS -D_FORTIFY_SOURCE=2"
+    CFLAGS="$CFLAGS -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2"
     if test x$have_clang = xyes; then
         TOR_CHECK_CFLAGS(-Qunused-arguments)
     fi